Harald Welte | 468b643 | 2014-09-11 13:05:51 +0800 | [diff] [blame] | 1 | /* |
Harald Welte | 48f5583 | 2017-01-26 00:03:10 +0100 | [diff] [blame] | 2 | * (C) 2011-2017 by Harald Welte <laforge@gnumonks.org> |
Harald Welte | 468b643 | 2014-09-11 13:05:51 +0800 | [diff] [blame] | 3 | * |
| 4 | * All Rights Reserved |
| 5 | * |
Harald Welte | e08da97 | 2017-11-13 01:00:26 +0900 | [diff] [blame] | 6 | * SPDX-License-Identifier: GPL-2.0+ |
| 7 | * |
Harald Welte | 468b643 | 2014-09-11 13:05:51 +0800 | [diff] [blame] | 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License along |
| 19 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 20 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 21 | * |
| 22 | */ |
| 23 | |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 24 | #include "../config.h" |
| 25 | |
Harald Welte | ba6988b | 2011-08-17 12:46:48 +0200 | [diff] [blame] | 26 | /*! \addtogroup socket |
| 27 | * @{ |
Neels Hofmeyr | 17518fe | 2017-06-20 04:35:06 +0200 | [diff] [blame] | 28 | * Osmocom socket convenience functions. |
| 29 | * |
| 30 | * \file socket.c */ |
Harald Welte | 96e2a00 | 2017-06-12 21:44:18 +0200 | [diff] [blame] | 31 | |
Harald Welte | e476442 | 2011-05-22 12:25:57 +0200 | [diff] [blame] | 32 | #ifdef HAVE_SYS_SOCKET_H |
| 33 | |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 34 | #include <osmocom/core/logging.h> |
| 35 | #include <osmocom/core/select.h> |
| 36 | #include <osmocom/core/socket.h> |
Harald Welte | 48f5583 | 2017-01-26 00:03:10 +0100 | [diff] [blame] | 37 | #include <osmocom/core/talloc.h> |
Neels Hofmeyr | 59f4caf | 2018-07-19 22:13:19 +0200 | [diff] [blame] | 38 | #include <osmocom/core/utils.h> |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 39 | |
Pablo Neira Ayuso | 0849c9a | 2011-06-09 15:04:30 +0200 | [diff] [blame] | 40 | #include <sys/ioctl.h> |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 41 | #include <sys/socket.h> |
| 42 | #include <sys/types.h> |
Álvaro Neira Ayuso | 5ade61a | 2014-03-24 13:02:00 +0100 | [diff] [blame] | 43 | #include <sys/un.h> |
Harald Welte | 44b9926 | 2020-03-07 14:59:05 +0100 | [diff] [blame] | 44 | #include <net/if.h> |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 45 | |
Holger Hans Peter Freyther | 4772348 | 2011-11-09 11:26:15 +0100 | [diff] [blame] | 46 | #include <netinet/in.h> |
Harald Welte | e30d7e6 | 2017-07-13 16:02:50 +0200 | [diff] [blame] | 47 | #include <arpa/inet.h> |
Holger Hans Peter Freyther | 4772348 | 2011-11-09 11:26:15 +0100 | [diff] [blame] | 48 | |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 49 | #include <stdio.h> |
| 50 | #include <unistd.h> |
| 51 | #include <stdint.h> |
| 52 | #include <string.h> |
| 53 | #include <errno.h> |
| 54 | #include <netdb.h> |
| 55 | #include <ifaddrs.h> |
| 56 | |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 57 | #ifdef HAVE_LIBSCTP |
| 58 | #include <netinet/sctp.h> |
| 59 | #endif |
| 60 | |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 61 | static struct addrinfo *addrinfo_helper(uint16_t family, uint16_t type, uint8_t proto, |
| 62 | const char *host, uint16_t port, bool passive) |
| 63 | { |
Pau Espin Pedrol | ff42852 | 2019-10-10 17:38:16 +0200 | [diff] [blame] | 64 | struct addrinfo hints, *result, *rp; |
Oliver Smith | 860651e | 2018-10-30 14:31:57 +0100 | [diff] [blame] | 65 | char portbuf[6]; |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 66 | int rc; |
| 67 | |
| 68 | snprintf(portbuf, sizeof(portbuf), "%u", port); |
| 69 | memset(&hints, 0, sizeof(struct addrinfo)); |
| 70 | hints.ai_family = family; |
| 71 | if (type == SOCK_RAW) { |
| 72 | /* Workaround for glibc, that returns EAI_SERVICE (-8) if |
| 73 | * SOCK_RAW and IPPROTO_GRE is used. |
Pau Espin Pedrol | ff42852 | 2019-10-10 17:38:16 +0200 | [diff] [blame] | 74 | * http://sourceware.org/bugzilla/show_bug.cgi?id=15015 |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 75 | */ |
| 76 | hints.ai_socktype = SOCK_DGRAM; |
| 77 | hints.ai_protocol = IPPROTO_UDP; |
| 78 | } else { |
| 79 | hints.ai_socktype = type; |
| 80 | hints.ai_protocol = proto; |
| 81 | } |
Pau Espin Pedrol | cd13331 | 2020-08-19 17:25:04 +0200 | [diff] [blame] | 82 | hints.ai_flags = AI_ADDRCONFIG; |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 83 | if (passive) |
| 84 | hints.ai_flags |= AI_PASSIVE; |
| 85 | |
| 86 | rc = getaddrinfo(host, portbuf, &hints, &result); |
| 87 | if (rc != 0) { |
Pau Espin Pedrol | ba828c3 | 2020-08-20 18:28:10 +0200 | [diff] [blame] | 88 | LOGP(DLGLOBAL, LOGL_ERROR, "getaddrinfo(%s, %u) failed: %s\n", |
| 89 | host, port, gai_strerror(rc)); |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 90 | return NULL; |
| 91 | } |
| 92 | |
Pau Espin Pedrol | ff42852 | 2019-10-10 17:38:16 +0200 | [diff] [blame] | 93 | for (rp = result; rp != NULL; rp = rp->ai_next) { |
| 94 | /* Workaround for glibc again */ |
| 95 | if (type == SOCK_RAW) { |
| 96 | rp->ai_socktype = SOCK_RAW; |
| 97 | rp->ai_protocol = proto; |
| 98 | } |
| 99 | } |
| 100 | |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 101 | return result; |
| 102 | } |
| 103 | |
Pau Espin Pedrol | 8fac511 | 2019-10-24 15:39:25 +0200 | [diff] [blame] | 104 | #ifdef HAVE_LIBSCTP |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 105 | /*! Retrieve an array of addrinfo with specified hints, one for each host in the hosts array. |
| 106 | * \param[out] addrinfo array of addrinfo pointers, will be filled by the function on success. |
| 107 | * Its size must be at least the one of hosts. |
| 108 | * \param[in] family Socket family like AF_INET, AF_INET6. |
| 109 | * \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM. |
| 110 | * \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP. |
| 111 | * \param[in] hosts array of char pointers (strings) containing the addresses to query. |
| 112 | * \param[in] host_cnt length of the hosts array (in items). |
| 113 | * \param[in] port port number in host byte order. |
| 114 | * \param[in] passive whether to include the AI_PASSIVE flag in getaddrinfo() hints. |
| 115 | * \returns 0 is returned on success together with a filled addrinfo array; negative on error |
| 116 | */ |
| 117 | static int addrinfo_helper_multi(struct addrinfo **addrinfo, uint16_t family, uint16_t type, uint8_t proto, |
| 118 | const char **hosts, size_t host_cnt, uint16_t port, bool passive) |
| 119 | { |
| 120 | int i, j; |
| 121 | |
| 122 | for (i = 0; i < host_cnt; i++) { |
| 123 | addrinfo[i] = addrinfo_helper(family, type, proto, hosts[i], port, passive); |
| 124 | if (!addrinfo[i]) { |
| 125 | for (j = 0; j < i; j++) |
| 126 | freeaddrinfo(addrinfo[j]); |
| 127 | return -EINVAL; |
| 128 | } |
| 129 | } |
| 130 | return 0; |
| 131 | } |
Pau Espin Pedrol | 8fac511 | 2019-10-24 15:39:25 +0200 | [diff] [blame] | 132 | #endif /* HAVE_LIBSCTP*/ |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 133 | |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 134 | static int socket_helper(const struct addrinfo *rp, unsigned int flags) |
| 135 | { |
| 136 | int sfd, on = 1; |
| 137 | |
| 138 | sfd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol); |
Pau Espin Pedrol | 5d50fa5 | 2018-04-05 17:00:22 +0200 | [diff] [blame] | 139 | if (sfd == -1) { |
| 140 | LOGP(DLGLOBAL, LOGL_ERROR, |
| 141 | "unable to create socket: %s\n", strerror(errno)); |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 142 | return sfd; |
Pau Espin Pedrol | 5d50fa5 | 2018-04-05 17:00:22 +0200 | [diff] [blame] | 143 | } |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 144 | if (flags & OSMO_SOCK_F_NONBLOCK) { |
| 145 | if (ioctl(sfd, FIONBIO, (unsigned char *)&on) < 0) { |
| 146 | LOGP(DLGLOBAL, LOGL_ERROR, |
| 147 | "cannot set this socket unblocking: %s\n", |
| 148 | strerror(errno)); |
| 149 | close(sfd); |
| 150 | sfd = -EINVAL; |
| 151 | } |
| 152 | } |
| 153 | return sfd; |
| 154 | } |
| 155 | |
Pau Espin Pedrol | 8fac511 | 2019-10-24 15:39:25 +0200 | [diff] [blame] | 156 | #ifdef HAVE_LIBSCTP |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 157 | /* Fill buf with a string representation of the address set, in the form: |
| 158 | * buf_len == 0: "()" |
| 159 | * buf_len == 1: "hostA" |
| 160 | * buf_len >= 2: (hostA|hostB|...|...) |
| 161 | */ |
| 162 | static int multiaddr_snprintf(char* buf, size_t buf_len, const char **hosts, size_t host_cnt) |
| 163 | { |
| 164 | int len = 0, offset = 0, rem = buf_len; |
| 165 | int ret, i; |
| 166 | char *after; |
| 167 | |
| 168 | if (buf_len < 3) |
| 169 | return -EINVAL; |
| 170 | |
| 171 | if (host_cnt != 1) { |
| 172 | ret = snprintf(buf, rem, "("); |
| 173 | if (ret < 0) |
| 174 | return ret; |
| 175 | OSMO_SNPRINTF_RET(ret, rem, offset, len); |
| 176 | } |
| 177 | for (i = 0; i < host_cnt; i++) { |
| 178 | if (host_cnt == 1) |
| 179 | after = ""; |
| 180 | else |
| 181 | after = (i == (host_cnt - 1)) ? ")" : "|"; |
| 182 | ret = snprintf(buf + offset, rem, "%s%s", hosts[i] ? : "0.0.0.0", after); |
| 183 | OSMO_SNPRINTF_RET(ret, rem, offset, len); |
| 184 | } |
| 185 | |
| 186 | return len; |
| 187 | } |
Pau Espin Pedrol | 8fac511 | 2019-10-24 15:39:25 +0200 | [diff] [blame] | 188 | #endif /* HAVE_LIBSCTP */ |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 189 | |
Harald Welte | c47bbda | 2017-07-13 16:13:26 +0200 | [diff] [blame] | 190 | static int osmo_sock_init_tail(int fd, uint16_t type, unsigned int flags) |
| 191 | { |
Harald Welte | bc43a62 | 2017-07-13 16:20:21 +0200 | [diff] [blame] | 192 | int rc; |
Harald Welte | c47bbda | 2017-07-13 16:13:26 +0200 | [diff] [blame] | 193 | |
| 194 | /* Make sure to call 'listen' on a bound, connection-oriented sock */ |
| 195 | if ((flags & (OSMO_SOCK_F_BIND|OSMO_SOCK_F_CONNECT)) == OSMO_SOCK_F_BIND) { |
| 196 | switch (type) { |
| 197 | case SOCK_STREAM: |
| 198 | case SOCK_SEQPACKET: |
| 199 | rc = listen(fd, 10); |
Harald Welte | bc43a62 | 2017-07-13 16:20:21 +0200 | [diff] [blame] | 200 | if (rc < 0) { |
| 201 | LOGP(DLGLOBAL, LOGL_ERROR, "unable to listen on socket: %s\n", |
| 202 | strerror(errno)); |
| 203 | return rc; |
| 204 | } |
| 205 | break; |
Harald Welte | c47bbda | 2017-07-13 16:13:26 +0200 | [diff] [blame] | 206 | } |
| 207 | } |
| 208 | |
Harald Welte | bc43a62 | 2017-07-13 16:20:21 +0200 | [diff] [blame] | 209 | if (flags & OSMO_SOCK_F_NO_MCAST_LOOP) { |
| 210 | rc = osmo_sock_mcast_loop_set(fd, false); |
| 211 | if (rc < 0) { |
| 212 | LOGP(DLGLOBAL, LOGL_ERROR, "unable to disable multicast loop: %s\n", |
| 213 | strerror(errno)); |
| 214 | return rc; |
| 215 | } |
| 216 | } |
Harald Welte | c47bbda | 2017-07-13 16:13:26 +0200 | [diff] [blame] | 217 | |
Harald Welte | 37d204a | 2017-07-13 16:33:16 +0200 | [diff] [blame] | 218 | if (flags & OSMO_SOCK_F_NO_MCAST_ALL) { |
| 219 | rc = osmo_sock_mcast_all_set(fd, false); |
| 220 | if (rc < 0) { |
| 221 | LOGP(DLGLOBAL, LOGL_ERROR, "unable to disable receive of all multicast: %s\n", |
| 222 | strerror(errno)); |
| 223 | /* do not abort here, as this is just an |
| 224 | * optional additional optimization that only |
| 225 | * exists on Linux only */ |
| 226 | } |
| 227 | } |
Harald Welte | bc43a62 | 2017-07-13 16:20:21 +0200 | [diff] [blame] | 228 | return 0; |
Harald Welte | c47bbda | 2017-07-13 16:13:26 +0200 | [diff] [blame] | 229 | } |
| 230 | |
Neels Hofmeyr | 87e4550 | 2017-06-20 00:17:59 +0200 | [diff] [blame] | 231 | /*! Initialize a socket (including bind and/or connect) |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 232 | * \param[in] family Address Family like AF_INET, AF_INET6, AF_UNSPEC |
| 233 | * \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM |
| 234 | * \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP |
| 235 | * \param[in] local_host local host name or IP address in string form |
| 236 | * \param[in] local_port local port number in host byte order |
| 237 | * \param[in] remote_host remote host name or IP address in string form |
| 238 | * \param[in] remote_port remote port number in host byte order |
| 239 | * \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT |
| 240 | * \returns socket file descriptor on success; negative on error |
| 241 | * |
| 242 | * This function creates a new socket of the designated \a family, \a |
| 243 | * type and \a proto and optionally binds it to the \a local_host and \a |
| 244 | * local_port as well as optionally connects it to the \a remote_host |
| 245 | * and \q remote_port, depending on the value * of \a flags parameter. |
| 246 | * |
| 247 | * As opposed to \ref osmo_sock_init(), this function allows to combine |
| 248 | * the \ref OSMO_SOCK_F_BIND and \ref OSMO_SOCK_F_CONNECT flags. This |
| 249 | * is useful if you want to connect to a remote host/port, but still |
| 250 | * want to bind that socket to either a specific local alias IP and/or a |
| 251 | * specific local source port. |
| 252 | * |
| 253 | * You must specify either \ref OSMO_SOCK_F_BIND, or \ref |
| 254 | * OSMO_SOCK_F_CONNECT, or both. |
| 255 | * |
| 256 | * If \ref OSMO_SOCK_F_NONBLOCK is specified, the socket will be set to |
| 257 | * non-blocking mode. |
| 258 | */ |
| 259 | int osmo_sock_init2(uint16_t family, uint16_t type, uint8_t proto, |
| 260 | const char *local_host, uint16_t local_port, |
| 261 | const char *remote_host, uint16_t remote_port, unsigned int flags) |
| 262 | { |
Alexander Couzens | 2c962f5 | 2020-06-03 00:28:02 +0200 | [diff] [blame] | 263 | struct addrinfo *local = NULL, *remote = NULL, *rp; |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 264 | int sfd = -1, rc, on = 1; |
| 265 | |
Alexander Couzens | 2c962f5 | 2020-06-03 00:28:02 +0200 | [diff] [blame] | 266 | bool local_ipv4 = false, local_ipv6 = false; |
| 267 | bool remote_ipv4 = false, remote_ipv6 = false; |
| 268 | |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 269 | if ((flags & (OSMO_SOCK_F_BIND | OSMO_SOCK_F_CONNECT)) == 0) { |
| 270 | LOGP(DLGLOBAL, LOGL_ERROR, "invalid: you have to specify either " |
| 271 | "BIND or CONNECT flags\n"); |
| 272 | return -EINVAL; |
| 273 | } |
| 274 | |
Alexander Couzens | 2c962f5 | 2020-06-03 00:28:02 +0200 | [diff] [blame] | 275 | /* figure out local address infos */ |
| 276 | if (flags & OSMO_SOCK_F_BIND) { |
| 277 | local = addrinfo_helper(family, type, proto, local_host, local_port, true); |
| 278 | if (!local) |
| 279 | return -EINVAL; |
| 280 | } |
| 281 | |
| 282 | /* figure out remote address infos */ |
| 283 | if (flags & OSMO_SOCK_F_CONNECT) { |
| 284 | remote = addrinfo_helper(family, type, proto, remote_host, remote_port, false); |
| 285 | if (!remote) { |
| 286 | if (local) |
| 287 | freeaddrinfo(local); |
| 288 | |
| 289 | return -EINVAL; |
| 290 | } |
| 291 | } |
| 292 | |
| 293 | /* It must do a full run to ensure AF_UNSPEC does not fail. |
| 294 | * In case first local valid entry is IPv4 and only remote valid entry |
| 295 | * is IPv6 or vice versa */ |
| 296 | if (family == AF_UNSPEC) { |
| 297 | for (rp = local; rp != NULL; rp = rp->ai_next) { |
| 298 | switch (rp->ai_family) { |
| 299 | case AF_INET: |
| 300 | local_ipv4 = true; |
| 301 | break; |
| 302 | case AF_INET6: |
| 303 | local_ipv6 = true; |
| 304 | break; |
| 305 | } |
| 306 | } |
| 307 | |
| 308 | for (rp = remote; rp != NULL; rp = rp->ai_next) { |
| 309 | switch (rp->ai_family) { |
| 310 | case AF_INET: |
| 311 | remote_ipv4 = true; |
| 312 | break; |
| 313 | case AF_INET6: |
| 314 | remote_ipv6 = true; |
| 315 | break; |
| 316 | } |
| 317 | } |
| 318 | |
| 319 | /* priotize ipv6 as per RFC */ |
| 320 | if (local_ipv6 && remote_ipv6) |
| 321 | family = AF_INET6; |
| 322 | else if (local_ipv4 && remote_ipv4) |
| 323 | family = AF_INET; |
| 324 | else { |
| 325 | if (local) |
| 326 | freeaddrinfo(local); |
| 327 | if (remote) |
| 328 | freeaddrinfo(remote); |
| 329 | LOGP(DLGLOBAL, LOGL_ERROR, "Unable to find a common protocol (IPv4 or IPv6) for local host: %s and remote host: %s.\n", |
| 330 | local_host, remote_host); |
| 331 | return -ENODEV; |
| 332 | } |
| 333 | } |
| 334 | |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 335 | /* figure out local side of socket */ |
| 336 | if (flags & OSMO_SOCK_F_BIND) { |
Alexander Couzens | 2c962f5 | 2020-06-03 00:28:02 +0200 | [diff] [blame] | 337 | for (rp = local; rp != NULL; rp = rp->ai_next) { |
| 338 | /* When called with AF_UNSPEC, family will set to IPv4 or IPv6 */ |
| 339 | if (rp->ai_family != family) |
| 340 | continue; |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 341 | |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 342 | sfd = socket_helper(rp, flags); |
| 343 | if (sfd < 0) |
| 344 | continue; |
| 345 | |
Philipp Maier | 73196e7 | 2018-08-23 20:11:50 +0200 | [diff] [blame] | 346 | if (proto != IPPROTO_UDP || flags & OSMO_SOCK_F_UDP_REUSEADDR) { |
Philipp Maier | 99f706d | 2018-08-01 12:40:36 +0200 | [diff] [blame] | 347 | rc = setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, |
| 348 | &on, sizeof(on)); |
| 349 | if (rc < 0) { |
| 350 | LOGP(DLGLOBAL, LOGL_ERROR, |
| 351 | "cannot setsockopt socket:" |
| 352 | " %s:%u: %s\n", |
| 353 | local_host, local_port, |
| 354 | strerror(errno)); |
| 355 | close(sfd); |
| 356 | continue; |
| 357 | } |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 358 | } |
Philipp Maier | 99f706d | 2018-08-01 12:40:36 +0200 | [diff] [blame] | 359 | |
Pau Espin Pedrol | 5d50fa5 | 2018-04-05 17:00:22 +0200 | [diff] [blame] | 360 | if (bind(sfd, rp->ai_addr, rp->ai_addrlen) == -1) { |
| 361 | LOGP(DLGLOBAL, LOGL_ERROR, "unable to bind socket: %s:%u: %s\n", |
| 362 | local_host, local_port, strerror(errno)); |
| 363 | close(sfd); |
| 364 | continue; |
| 365 | } |
| 366 | break; |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 367 | } |
Alexander Couzens | 2c962f5 | 2020-06-03 00:28:02 +0200 | [diff] [blame] | 368 | |
| 369 | freeaddrinfo(local); |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 370 | if (rp == NULL) { |
Alexander Couzens | 2c962f5 | 2020-06-03 00:28:02 +0200 | [diff] [blame] | 371 | if (remote) |
| 372 | freeaddrinfo(remote); |
Pau Espin Pedrol | 5d50fa5 | 2018-04-05 17:00:22 +0200 | [diff] [blame] | 373 | LOGP(DLGLOBAL, LOGL_ERROR, "no suitable local addr found for: %s:%u\n", |
| 374 | local_host, local_port); |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 375 | return -ENODEV; |
| 376 | } |
| 377 | } |
| 378 | |
Pau Espin Pedrol | 5d50fa5 | 2018-04-05 17:00:22 +0200 | [diff] [blame] | 379 | /* Reached this point, if OSMO_SOCK_F_BIND then sfd is valid (>=0) or it |
| 380 | was already closed and func returned. If OSMO_SOCK_F_BIND is not |
| 381 | set, then sfd = -1 */ |
| 382 | |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 383 | /* figure out remote side of socket */ |
| 384 | if (flags & OSMO_SOCK_F_CONNECT) { |
Alexander Couzens | 2c962f5 | 2020-06-03 00:28:02 +0200 | [diff] [blame] | 385 | for (rp = remote; rp != NULL; rp = rp->ai_next) { |
| 386 | /* When called with AF_UNSPEC, family will set to IPv4 or IPv6 */ |
| 387 | if (rp->ai_family != family) |
| 388 | continue; |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 389 | |
Harald Welte | 5cfa6dc | 2017-07-21 16:52:29 +0200 | [diff] [blame] | 390 | if (sfd < 0) { |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 391 | sfd = socket_helper(rp, flags); |
| 392 | if (sfd < 0) |
| 393 | continue; |
| 394 | } |
| 395 | |
| 396 | rc = connect(sfd, rp->ai_addr, rp->ai_addrlen); |
Pau Espin Pedrol | 27cf8df | 2018-04-05 17:49:08 +0200 | [diff] [blame] | 397 | if (rc != 0 && errno != EINPROGRESS) { |
| 398 | LOGP(DLGLOBAL, LOGL_ERROR, "unable to connect socket: %s:%u: %s\n", |
| 399 | remote_host, remote_port, strerror(errno)); |
| 400 | /* We want to maintain the bind socket if bind was enabled */ |
| 401 | if (!(flags & OSMO_SOCK_F_BIND)) { |
| 402 | close(sfd); |
| 403 | sfd = -1; |
| 404 | } |
| 405 | continue; |
| 406 | } |
| 407 | break; |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 408 | } |
Alexander Couzens | 2c962f5 | 2020-06-03 00:28:02 +0200 | [diff] [blame] | 409 | |
| 410 | freeaddrinfo(remote); |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 411 | if (rp == NULL) { |
Pau Espin Pedrol | 27cf8df | 2018-04-05 17:49:08 +0200 | [diff] [blame] | 412 | LOGP(DLGLOBAL, LOGL_ERROR, "no suitable remote addr found for: %s:%u\n", |
| 413 | remote_host, remote_port); |
| 414 | if (sfd >= 0) |
| 415 | close(sfd); |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 416 | return -ENODEV; |
| 417 | } |
| 418 | } |
| 419 | |
Harald Welte | c47bbda | 2017-07-13 16:13:26 +0200 | [diff] [blame] | 420 | rc = osmo_sock_init_tail(sfd, type, flags); |
| 421 | if (rc < 0) { |
| 422 | close(sfd); |
| 423 | sfd = -1; |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 424 | } |
Harald Welte | c47bbda | 2017-07-13 16:13:26 +0200 | [diff] [blame] | 425 | |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 426 | return sfd; |
| 427 | } |
| 428 | |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 429 | #ifdef HAVE_LIBSCTP |
| 430 | |
Pau Espin Pedrol | cd13331 | 2020-08-19 17:25:04 +0200 | [diff] [blame] | 431 | /* Check whether there's an IPv6 Addr as first option of any addrinfo item in the addrinfo set */ |
| 432 | static void addrinfo_has_v4v6addr(const struct addrinfo **result, size_t result_count, bool *has_v4, bool *has_v6) |
| 433 | { |
| 434 | size_t host_idx; |
| 435 | *has_v4 = false; |
| 436 | *has_v6 = false; |
| 437 | |
| 438 | for (host_idx = 0; host_idx < result_count; host_idx++) { |
| 439 | if (result[host_idx]->ai_family == AF_INET) |
| 440 | *has_v4 = true; |
| 441 | else if (result[host_idx]->ai_family == AF_INET6) |
| 442 | *has_v6 = true; |
| 443 | } |
| 444 | } |
| 445 | |
| 446 | static int socket_helper_multiaddr(uint16_t family, uint16_t type, uint8_t proto, unsigned int flags) |
| 447 | { |
| 448 | int sfd, on = 1; |
| 449 | |
| 450 | sfd = socket(family, type, proto); |
| 451 | if (sfd == -1) { |
| 452 | LOGP(DLGLOBAL, LOGL_ERROR, |
| 453 | "Unable to create socket: %s\n", strerror(errno)); |
| 454 | return sfd; |
| 455 | } |
| 456 | if (flags & OSMO_SOCK_F_NONBLOCK) { |
| 457 | if (ioctl(sfd, FIONBIO, (unsigned char *)&on) < 0) { |
| 458 | LOGP(DLGLOBAL, LOGL_ERROR, |
| 459 | "Cannot set this socket unblocking: %s\n", |
| 460 | strerror(errno)); |
| 461 | close(sfd); |
| 462 | sfd = -EINVAL; |
| 463 | } |
| 464 | } |
| 465 | return sfd; |
| 466 | } |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 467 | |
| 468 | /* Build array of addresses taking first addrinfo result of the requested family |
Pau Espin Pedrol | cd13331 | 2020-08-19 17:25:04 +0200 | [diff] [blame] | 469 | * for each host in addrs_buf. */ |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 470 | static int addrinfo_to_sockaddr(uint16_t family, const struct addrinfo **result, |
| 471 | const char **hosts, int host_cont, |
Pau Espin Pedrol | cd13331 | 2020-08-19 17:25:04 +0200 | [diff] [blame] | 472 | uint8_t *addrs_buf, size_t addrs_buf_len) { |
| 473 | size_t host_idx, offset = 0; |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 474 | const struct addrinfo *rp; |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 475 | |
| 476 | for (host_idx = 0; host_idx < host_cont; host_idx++) { |
Pau Espin Pedrol | cd13331 | 2020-08-19 17:25:04 +0200 | [diff] [blame] | 477 | /* Addresses are ordered based on RFC 3484, see man getaddrinfo */ |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 478 | for (rp = result[host_idx]; rp != NULL; rp = rp->ai_next) { |
Pau Espin Pedrol | cd13331 | 2020-08-19 17:25:04 +0200 | [diff] [blame] | 479 | if (family != AF_UNSPEC && rp->ai_family != family) |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 480 | continue; |
Pau Espin Pedrol | cd13331 | 2020-08-19 17:25:04 +0200 | [diff] [blame] | 481 | if (offset + rp->ai_addrlen > addrs_buf_len) { |
| 482 | LOGP(DLGLOBAL, LOGL_ERROR, "Output buffer to small: %zu\n", |
| 483 | addrs_buf_len); |
| 484 | return -ENOSPC; |
| 485 | } |
| 486 | memcpy(addrs_buf + offset, rp->ai_addr, rp->ai_addrlen); |
| 487 | offset += rp->ai_addrlen; |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 488 | break; |
| 489 | } |
| 490 | if (!rp) { /* No addr could be bound for this host! */ |
| 491 | LOGP(DLGLOBAL, LOGL_ERROR, "No suitable remote address found for host: %s\n", |
| 492 | hosts[host_idx]); |
| 493 | return -ENODEV; |
| 494 | } |
| 495 | } |
| 496 | return 0; |
| 497 | } |
| 498 | |
| 499 | /*! Initialize a socket (including bind and/or connect) with multiple local or remote addresses. |
| 500 | * \param[in] family Address Family like AF_INET, AF_INET6, AF_UNSPEC |
| 501 | * \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM |
| 502 | * \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP |
| 503 | * \param[in] local_hosts array of char pointers (strings), each containing local host name or IP address in string form |
| 504 | * \param[in] local_hosts_cnt length of local_hosts (in items) |
| 505 | * \param[in] local_port local port number in host byte order |
| 506 | * \param[in] remote_host array of char pointers (strings), each containing remote host name or IP address in string form |
| 507 | * \param[in] remote_hosts_cnt length of remote_hosts (in items) |
| 508 | * \param[in] remote_port remote port number in host byte order |
| 509 | * \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT |
| 510 | * \returns socket file descriptor on success; negative on error |
| 511 | * |
| 512 | * This function is similar to \ref osmo_sock_init2(), but can be passed an |
| 513 | * array of local or remote addresses for protocols supporting multiple |
| 514 | * addresses per socket, like SCTP (currently only one supported). This function |
| 515 | * should not be used by protocols not supporting this kind of features, but |
| 516 | * rather \ref osmo_sock_init2() should be used instead. |
| 517 | * See \ref osmo_sock_init2() for more information on flags and general behavior. |
| 518 | */ |
| 519 | int osmo_sock_init2_multiaddr(uint16_t family, uint16_t type, uint8_t proto, |
| 520 | const char **local_hosts, size_t local_hosts_cnt, uint16_t local_port, |
| 521 | const char **remote_hosts, size_t remote_hosts_cnt, uint16_t remote_port, |
| 522 | unsigned int flags) |
| 523 | |
| 524 | { |
Pau Espin Pedrol | 796c651 | 2020-08-19 12:03:25 +0200 | [diff] [blame] | 525 | struct addrinfo *res_loc[OSMO_SOCK_MAX_ADDRS], *res_rem[OSMO_SOCK_MAX_ADDRS]; |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 526 | int sfd = -1, rc, on = 1; |
| 527 | int i; |
Pau Espin Pedrol | cd13331 | 2020-08-19 17:25:04 +0200 | [diff] [blame] | 528 | bool loc_has_v4addr, rem_has_v4addr; |
| 529 | bool loc_has_v6addr, rem_has_v6addr; |
| 530 | struct sockaddr_in6 addrs_buf[OSMO_SOCK_MAX_ADDRS]; |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 531 | char strbuf[512]; |
| 532 | |
Pau Espin Pedrol | cd13331 | 2020-08-19 17:25:04 +0200 | [diff] [blame] | 533 | /* updated later in case of AF_UNSPEC */ |
| 534 | loc_has_v4addr = rem_has_v4addr = (family == AF_INET); |
| 535 | loc_has_v6addr = rem_has_v6addr = (family == AF_INET6); |
| 536 | |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 537 | /* TODO: So far this function is only aimed for SCTP, but could be |
| 538 | reused in the future for other protocols with multi-addr support */ |
| 539 | if (proto != IPPROTO_SCTP) |
| 540 | return -ENOTSUP; |
| 541 | |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 542 | if ((flags & (OSMO_SOCK_F_BIND | OSMO_SOCK_F_CONNECT)) == 0) { |
| 543 | LOGP(DLGLOBAL, LOGL_ERROR, "invalid: you have to specify either " |
| 544 | "BIND or CONNECT flags\n"); |
| 545 | return -EINVAL; |
| 546 | } |
| 547 | |
| 548 | if (((flags & OSMO_SOCK_F_BIND) && !local_hosts_cnt) || |
| 549 | ((flags & OSMO_SOCK_F_CONNECT) && !remote_hosts_cnt) || |
| 550 | local_hosts_cnt > OSMO_SOCK_MAX_ADDRS || |
| 551 | remote_hosts_cnt > OSMO_SOCK_MAX_ADDRS) |
| 552 | return -EINVAL; |
| 553 | |
| 554 | /* figure out local side of socket */ |
| 555 | if (flags & OSMO_SOCK_F_BIND) { |
Pau Espin Pedrol | 796c651 | 2020-08-19 12:03:25 +0200 | [diff] [blame] | 556 | rc = addrinfo_helper_multi(res_loc, family, type, proto, local_hosts, |
| 557 | local_hosts_cnt, local_port, true); |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 558 | if (rc < 0) |
| 559 | return -EINVAL; |
Pau Espin Pedrol | cd13331 | 2020-08-19 17:25:04 +0200 | [diff] [blame] | 560 | /* Figure out if there's any IPV4 or IPv6 addr in the set */ |
| 561 | if (family == AF_UNSPEC) |
| 562 | addrinfo_has_v4v6addr((const struct addrinfo **)res_loc, local_hosts_cnt, |
| 563 | &loc_has_v4addr, &loc_has_v6addr); |
Pau Espin Pedrol | 796c651 | 2020-08-19 12:03:25 +0200 | [diff] [blame] | 564 | } |
| 565 | /* figure out remote side of socket */ |
| 566 | if (flags & OSMO_SOCK_F_CONNECT) { |
| 567 | rc = addrinfo_helper_multi(res_rem, family, type, proto, remote_hosts, |
| 568 | remote_hosts_cnt, remote_port, false); |
| 569 | if (rc < 0) |
| 570 | return -EINVAL; |
Pau Espin Pedrol | cd13331 | 2020-08-19 17:25:04 +0200 | [diff] [blame] | 571 | /* Figure out if there's any IPv4 or IPv6 addr in the set */ |
| 572 | if (family == AF_UNSPEC) |
| 573 | addrinfo_has_v4v6addr((const struct addrinfo **)res_rem, remote_hosts_cnt, |
| 574 | &rem_has_v4addr, &rem_has_v6addr); |
Pau Espin Pedrol | 796c651 | 2020-08-19 12:03:25 +0200 | [diff] [blame] | 575 | } |
| 576 | |
Pau Espin Pedrol | cd13331 | 2020-08-19 17:25:04 +0200 | [diff] [blame] | 577 | if (((flags & OSMO_SOCK_F_BIND) && (flags & OSMO_SOCK_F_CONNECT)) && |
| 578 | (loc_has_v4addr != rem_has_v4addr || loc_has_v6addr != rem_has_v6addr)) { |
| 579 | LOGP(DLGLOBAL, LOGL_ERROR, "Invalid v4 vs v6 in local vs remote addresses\n"); |
| 580 | rc = -EINVAL; |
| 581 | goto ret_freeaddrinfo; |
| 582 | } |
| 583 | |
| 584 | sfd = socket_helper_multiaddr(loc_has_v6addr ? AF_INET6 : AF_INET, |
| 585 | type, proto, flags); |
| 586 | if (sfd < 0) { |
| 587 | rc = sfd; |
| 588 | goto ret_freeaddrinfo; |
| 589 | } |
| 590 | |
Pau Espin Pedrol | 796c651 | 2020-08-19 12:03:25 +0200 | [diff] [blame] | 591 | if (flags & OSMO_SOCK_F_BIND) { |
Pau Espin Pedrol | 272dfc1 | 2019-10-21 11:11:27 +0200 | [diff] [blame] | 592 | /* Since so far we only allow IPPROTO_SCTP in this function, |
| 593 | no need to check below for "proto != IPPROTO_UDP || flags & OSMO_SOCK_F_UDP_REUSEADDR" */ |
| 594 | rc = setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, |
| 595 | &on, sizeof(on)); |
| 596 | if (rc < 0) { |
| 597 | multiaddr_snprintf(strbuf, sizeof(strbuf), local_hosts, local_hosts_cnt); |
| 598 | LOGP(DLGLOBAL, LOGL_ERROR, |
| 599 | "cannot setsockopt socket:" |
| 600 | " %s:%u: %s\n", |
| 601 | strbuf, local_port, |
| 602 | strerror(errno)); |
Pau Espin Pedrol | 796c651 | 2020-08-19 12:03:25 +0200 | [diff] [blame] | 603 | goto ret_close; |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 604 | } |
| 605 | |
Pau Espin Pedrol | cd13331 | 2020-08-19 17:25:04 +0200 | [diff] [blame] | 606 | /* Build array of addresses taking first entry for each host. |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 607 | TODO: Ideally we should use backtracking storing last used |
| 608 | indexes and trying next combination if connect() fails .*/ |
Pau Espin Pedrol | cd13331 | 2020-08-19 17:25:04 +0200 | [diff] [blame] | 609 | /* We could alternatively use v4v6 mapped addresses and call sctp_bindx once with an array od sockaddr_in6 */ |
Pau Espin Pedrol | 796c651 | 2020-08-19 12:03:25 +0200 | [diff] [blame] | 610 | rc = addrinfo_to_sockaddr(family, (const struct addrinfo **)res_loc, |
Pau Espin Pedrol | cd13331 | 2020-08-19 17:25:04 +0200 | [diff] [blame] | 611 | local_hosts, local_hosts_cnt, |
| 612 | (uint8_t*)addrs_buf, sizeof(addrs_buf)); |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 613 | if (rc < 0) { |
Pau Espin Pedrol | 796c651 | 2020-08-19 12:03:25 +0200 | [diff] [blame] | 614 | rc = -ENODEV; |
| 615 | goto ret_close; |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 616 | } |
| 617 | |
Pau Espin Pedrol | cd13331 | 2020-08-19 17:25:04 +0200 | [diff] [blame] | 618 | rc = sctp_bindx(sfd, (struct sockaddr *)addrs_buf, local_hosts_cnt, SCTP_BINDX_ADD_ADDR); |
| 619 | if (rc == -1) { |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 620 | multiaddr_snprintf(strbuf, sizeof(strbuf), local_hosts, local_hosts_cnt); |
| 621 | LOGP(DLGLOBAL, LOGL_NOTICE, "unable to bind socket: %s:%u: %s\n", |
| 622 | strbuf, local_port, strerror(errno)); |
Pau Espin Pedrol | 796c651 | 2020-08-19 12:03:25 +0200 | [diff] [blame] | 623 | rc = -ENODEV; |
| 624 | goto ret_close; |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 625 | } |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 626 | } |
| 627 | |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 628 | if (flags & OSMO_SOCK_F_CONNECT) { |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 629 | /* Build array of addresses taking first of same family for each host. |
| 630 | TODO: Ideally we should use backtracking storing last used |
| 631 | indexes and trying next combination if connect() fails .*/ |
Pau Espin Pedrol | 796c651 | 2020-08-19 12:03:25 +0200 | [diff] [blame] | 632 | rc = addrinfo_to_sockaddr(family, (const struct addrinfo **)res_rem, |
Pau Espin Pedrol | cd13331 | 2020-08-19 17:25:04 +0200 | [diff] [blame] | 633 | remote_hosts, remote_hosts_cnt, |
| 634 | (uint8_t*)addrs_buf, sizeof(addrs_buf)); |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 635 | if (rc < 0) { |
Pau Espin Pedrol | 796c651 | 2020-08-19 12:03:25 +0200 | [diff] [blame] | 636 | rc = -ENODEV; |
| 637 | goto ret_close; |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 638 | } |
| 639 | |
Pau Espin Pedrol | cd13331 | 2020-08-19 17:25:04 +0200 | [diff] [blame] | 640 | rc = sctp_connectx(sfd, (struct sockaddr *)addrs_buf, remote_hosts_cnt, NULL); |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 641 | if (rc != 0 && errno != EINPROGRESS) { |
| 642 | multiaddr_snprintf(strbuf, sizeof(strbuf), remote_hosts, remote_hosts_cnt); |
| 643 | LOGP(DLGLOBAL, LOGL_ERROR, "unable to connect socket: %s:%u: %s\n", |
| 644 | strbuf, remote_port, strerror(errno)); |
Pau Espin Pedrol | 796c651 | 2020-08-19 12:03:25 +0200 | [diff] [blame] | 645 | rc = -ENODEV; |
| 646 | goto ret_close; |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 647 | } |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 648 | } |
| 649 | |
| 650 | rc = osmo_sock_init_tail(sfd, type, flags); |
| 651 | if (rc < 0) { |
| 652 | close(sfd); |
| 653 | sfd = -1; |
| 654 | } |
| 655 | |
Pau Espin Pedrol | 796c651 | 2020-08-19 12:03:25 +0200 | [diff] [blame] | 656 | rc = sfd; |
| 657 | goto ret_freeaddrinfo; |
| 658 | |
| 659 | ret_close: |
| 660 | if (sfd >= 0) |
| 661 | close(sfd); |
| 662 | ret_freeaddrinfo: |
| 663 | for (i = 0; i < local_hosts_cnt; i++) |
| 664 | freeaddrinfo(res_loc[i]); |
| 665 | for (i = 0; i < remote_hosts_cnt; i++) |
| 666 | freeaddrinfo(res_rem[i]); |
| 667 | return rc; |
Pau Espin Pedrol | 3f464fc | 2019-10-10 17:38:35 +0200 | [diff] [blame] | 668 | } |
| 669 | #endif /* HAVE_LIBSCTP */ |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 670 | |
Neels Hofmeyr | 87e4550 | 2017-06-20 00:17:59 +0200 | [diff] [blame] | 671 | /*! Initialize a socket (including bind/connect) |
Harald Welte | ba6988b | 2011-08-17 12:46:48 +0200 | [diff] [blame] | 672 | * \param[in] family Address Family like AF_INET, AF_INET6, AF_UNSPEC |
| 673 | * \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM |
| 674 | * \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP |
| 675 | * \param[in] host remote host name or IP address in string form |
| 676 | * \param[in] port remote port number in host byte order |
| 677 | * \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT |
Harald Welte | 2d2e2cc | 2016-04-25 12:11:20 +0200 | [diff] [blame] | 678 | * \returns socket file descriptor on success; negative on error |
Harald Welte | ba6988b | 2011-08-17 12:46:48 +0200 | [diff] [blame] | 679 | * |
| 680 | * This function creates a new socket of the designated \a family, \a |
| 681 | * type and \a proto and optionally binds or connects it, depending on |
| 682 | * the value of \a flags parameter. |
| 683 | */ |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 684 | int osmo_sock_init(uint16_t family, uint16_t type, uint8_t proto, |
Pablo Neira Ayuso | 0849c9a | 2011-06-09 15:04:30 +0200 | [diff] [blame] | 685 | const char *host, uint16_t port, unsigned int flags) |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 686 | { |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 687 | struct addrinfo *result, *rp; |
Harald Welte | 68b1574 | 2011-05-22 21:47:29 +0200 | [diff] [blame] | 688 | int sfd, rc, on = 1; |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 689 | |
Pablo Neira Ayuso | 0849c9a | 2011-06-09 15:04:30 +0200 | [diff] [blame] | 690 | if ((flags & (OSMO_SOCK_F_BIND | OSMO_SOCK_F_CONNECT)) == |
Neels Hofmeyr | f0f07d9 | 2016-08-22 13:34:23 +0200 | [diff] [blame] | 691 | (OSMO_SOCK_F_BIND | OSMO_SOCK_F_CONNECT)) { |
Philipp Maier | 6f0f560 | 2017-02-09 14:09:06 +0100 | [diff] [blame] | 692 | LOGP(DLGLOBAL, LOGL_ERROR, "invalid: both bind and connect flags set:" |
Neels Hofmeyr | b7f191f | 2016-08-29 11:22:03 +0200 | [diff] [blame] | 693 | " %s:%u\n", host, port); |
Pablo Neira Ayuso | 0849c9a | 2011-06-09 15:04:30 +0200 | [diff] [blame] | 694 | return -EINVAL; |
Neels Hofmeyr | f0f07d9 | 2016-08-22 13:34:23 +0200 | [diff] [blame] | 695 | } |
Pablo Neira Ayuso | 0849c9a | 2011-06-09 15:04:30 +0200 | [diff] [blame] | 696 | |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 697 | result = addrinfo_helper(family, type, proto, host, port, flags & OSMO_SOCK_F_BIND); |
Pau Espin Pedrol | ba828c3 | 2020-08-20 18:28:10 +0200 | [diff] [blame] | 698 | if (!result) |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 699 | return -EINVAL; |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 700 | |
| 701 | for (rp = result; rp != NULL; rp = rp->ai_next) { |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 702 | sfd = socket_helper(rp, flags); |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 703 | if (sfd == -1) |
| 704 | continue; |
Harald Welte | dda70fc | 2017-04-08 20:52:33 +0200 | [diff] [blame] | 705 | |
Pablo Neira Ayuso | 0849c9a | 2011-06-09 15:04:30 +0200 | [diff] [blame] | 706 | if (flags & OSMO_SOCK_F_CONNECT) { |
| 707 | rc = connect(sfd, rp->ai_addr, rp->ai_addrlen); |
Pau Espin Pedrol | 3a32147 | 2018-04-05 17:49:40 +0200 | [diff] [blame] | 708 | if (rc != 0 && errno != EINPROGRESS) { |
| 709 | close(sfd); |
| 710 | continue; |
| 711 | } |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 712 | } else { |
Philipp Maier | 73196e7 | 2018-08-23 20:11:50 +0200 | [diff] [blame] | 713 | if (proto != IPPROTO_UDP || flags & OSMO_SOCK_F_UDP_REUSEADDR) { |
Philipp Maier | 99f706d | 2018-08-01 12:40:36 +0200 | [diff] [blame] | 714 | rc = setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, |
| 715 | &on, sizeof(on)); |
| 716 | if (rc < 0) { |
| 717 | LOGP(DLGLOBAL, LOGL_ERROR, |
| 718 | "cannot setsockopt socket:" |
| 719 | " %s:%u: %s\n", |
| 720 | host, port, strerror(errno)); |
| 721 | close(sfd); |
| 722 | continue; |
| 723 | } |
Pablo Neira Ayuso | 0849c9a | 2011-06-09 15:04:30 +0200 | [diff] [blame] | 724 | } |
Pau Espin Pedrol | 3a32147 | 2018-04-05 17:49:40 +0200 | [diff] [blame] | 725 | if (bind(sfd, rp->ai_addr, rp->ai_addrlen) == -1) { |
| 726 | LOGP(DLGLOBAL, LOGL_ERROR, "unable to bind socket:" |
| 727 | "%s:%u: %s\n", |
| 728 | host, port, strerror(errno)); |
| 729 | close(sfd); |
| 730 | continue; |
| 731 | } |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 732 | } |
Pau Espin Pedrol | 3a32147 | 2018-04-05 17:49:40 +0200 | [diff] [blame] | 733 | break; |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 734 | } |
| 735 | freeaddrinfo(result); |
| 736 | |
| 737 | if (rp == NULL) { |
Pau Espin Pedrol | 3a32147 | 2018-04-05 17:49:40 +0200 | [diff] [blame] | 738 | LOGP(DLGLOBAL, LOGL_ERROR, "no suitable addr found for: %s:%u\n", |
| 739 | host, port); |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 740 | return -ENODEV; |
| 741 | } |
Harald Welte | 68b1574 | 2011-05-22 21:47:29 +0200 | [diff] [blame] | 742 | |
Philipp Maier | 73196e7 | 2018-08-23 20:11:50 +0200 | [diff] [blame] | 743 | if (proto != IPPROTO_UDP || flags & OSMO_SOCK_F_UDP_REUSEADDR) { |
Philipp Maier | 99f706d | 2018-08-01 12:40:36 +0200 | [diff] [blame] | 744 | rc = setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
| 745 | if (rc < 0) { |
| 746 | LOGP(DLGLOBAL, LOGL_ERROR, |
| 747 | "cannot setsockopt socket: %s:%u: %s\n", host, |
| 748 | port, strerror(errno)); |
| 749 | close(sfd); |
| 750 | sfd = -1; |
| 751 | } |
Philipp Maier | 0659c5d | 2018-08-01 12:43:08 +0200 | [diff] [blame] | 752 | } |
Harald Welte | 68b1574 | 2011-05-22 21:47:29 +0200 | [diff] [blame] | 753 | |
Harald Welte | c47bbda | 2017-07-13 16:13:26 +0200 | [diff] [blame] | 754 | rc = osmo_sock_init_tail(sfd, type, flags); |
| 755 | if (rc < 0) { |
| 756 | close(sfd); |
| 757 | sfd = -1; |
Harald Welte | 68b1574 | 2011-05-22 21:47:29 +0200 | [diff] [blame] | 758 | } |
Harald Welte | c47bbda | 2017-07-13 16:13:26 +0200 | [diff] [blame] | 759 | |
Harald Welte | 68b1574 | 2011-05-22 21:47:29 +0200 | [diff] [blame] | 760 | return sfd; |
| 761 | } |
| 762 | |
Neels Hofmeyr | 87e4550 | 2017-06-20 00:17:59 +0200 | [diff] [blame] | 763 | /*! fill \ref osmo_fd for a give sfd |
Max | 862ba65 | 2014-10-13 14:54:25 +0200 | [diff] [blame] | 764 | * \param[out] ofd file descriptor (will be filled in) |
| 765 | * \param[in] sfd socket file descriptor |
Harald Welte | 2d2e2cc | 2016-04-25 12:11:20 +0200 | [diff] [blame] | 766 | * \returns socket fd on success; negative on error |
Max | 862ba65 | 2014-10-13 14:54:25 +0200 | [diff] [blame] | 767 | * |
| 768 | * This function fills the \a ofd structure. |
| 769 | */ |
| 770 | static inline int osmo_fd_init_ofd(struct osmo_fd *ofd, int sfd) |
| 771 | { |
| 772 | int rc; |
| 773 | |
| 774 | if (sfd < 0) |
| 775 | return sfd; |
| 776 | |
| 777 | ofd->fd = sfd; |
Harald Welte | 1688699 | 2019-03-20 10:26:39 +0100 | [diff] [blame] | 778 | ofd->when = OSMO_FD_READ; |
Max | 862ba65 | 2014-10-13 14:54:25 +0200 | [diff] [blame] | 779 | |
| 780 | rc = osmo_fd_register(ofd); |
| 781 | if (rc < 0) { |
| 782 | close(sfd); |
| 783 | return rc; |
| 784 | } |
| 785 | |
| 786 | return sfd; |
| 787 | } |
| 788 | |
Neels Hofmeyr | 87e4550 | 2017-06-20 00:17:59 +0200 | [diff] [blame] | 789 | /*! Initialize a socket and fill \ref osmo_fd |
Katerina Barone-Adesi | c28c6a0 | 2013-02-15 13:27:59 +0100 | [diff] [blame] | 790 | * \param[out] ofd file descriptor (will be filled in) |
Harald Welte | ba6988b | 2011-08-17 12:46:48 +0200 | [diff] [blame] | 791 | * \param[in] family Address Family like AF_INET, AF_INET6, AF_UNSPEC |
| 792 | * \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM |
| 793 | * \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP |
| 794 | * \param[in] host remote host name or IP address in string form |
| 795 | * \param[in] port remote port number in host byte order |
| 796 | * \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT |
Harald Welte | 2d2e2cc | 2016-04-25 12:11:20 +0200 | [diff] [blame] | 797 | * \returns socket fd on success; negative on error |
Harald Welte | ba6988b | 2011-08-17 12:46:48 +0200 | [diff] [blame] | 798 | * |
| 799 | * This function creates (and optionall binds/connects) a socket using |
| 800 | * \ref osmo_sock_init, but also fills the \a ofd structure. |
| 801 | */ |
Harald Welte | 68b1574 | 2011-05-22 21:47:29 +0200 | [diff] [blame] | 802 | int osmo_sock_init_ofd(struct osmo_fd *ofd, int family, int type, int proto, |
Pablo Neira Ayuso | 0849c9a | 2011-06-09 15:04:30 +0200 | [diff] [blame] | 803 | const char *host, uint16_t port, unsigned int flags) |
Harald Welte | 68b1574 | 2011-05-22 21:47:29 +0200 | [diff] [blame] | 804 | { |
Max | 862ba65 | 2014-10-13 14:54:25 +0200 | [diff] [blame] | 805 | return osmo_fd_init_ofd(ofd, osmo_sock_init(family, type, proto, host, port, flags)); |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 806 | } |
| 807 | |
Neels Hofmeyr | 87e4550 | 2017-06-20 00:17:59 +0200 | [diff] [blame] | 808 | /*! Initialize a socket and fill \ref osmo_fd |
Pau Espin Pedrol | 75989e6 | 2017-05-26 12:39:53 +0200 | [diff] [blame] | 809 | * \param[out] ofd file descriptor (will be filled in) |
| 810 | * \param[in] family Address Family like AF_INET, AF_INET6, AF_UNSPEC |
| 811 | * \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM |
| 812 | * \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP |
| 813 | * \param[in] local_host local host name or IP address in string form |
| 814 | * \param[in] local_port local port number in host byte order |
| 815 | * \param[in] remote_host remote host name or IP address in string form |
| 816 | * \param[in] remote_port remote port number in host byte order |
| 817 | * \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT |
| 818 | * \returns socket fd on success; negative on error |
| 819 | * |
| 820 | * This function creates (and optionall binds/connects) a socket using |
| 821 | * \ref osmo_sock_init2, but also fills the \a ofd structure. |
| 822 | */ |
| 823 | int osmo_sock_init2_ofd(struct osmo_fd *ofd, int family, int type, int proto, |
| 824 | const char *local_host, uint16_t local_port, |
| 825 | const char *remote_host, uint16_t remote_port, unsigned int flags) |
| 826 | { |
| 827 | return osmo_fd_init_ofd(ofd, osmo_sock_init2(family, type, proto, local_host, |
| 828 | local_port, remote_host, remote_port, flags)); |
| 829 | } |
| 830 | |
Neels Hofmeyr | 87e4550 | 2017-06-20 00:17:59 +0200 | [diff] [blame] | 831 | /*! Initialize a socket and fill \ref sockaddr |
Harald Welte | ba6988b | 2011-08-17 12:46:48 +0200 | [diff] [blame] | 832 | * \param[out] ss socket address (will be filled in) |
| 833 | * \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM |
| 834 | * \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP |
| 835 | * \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT |
Harald Welte | 2d2e2cc | 2016-04-25 12:11:20 +0200 | [diff] [blame] | 836 | * \returns socket fd on success; negative on error |
Harald Welte | ba6988b | 2011-08-17 12:46:48 +0200 | [diff] [blame] | 837 | * |
| 838 | * This function creates (and optionall binds/connects) a socket using |
| 839 | * \ref osmo_sock_init, but also fills the \a ss structure. |
| 840 | */ |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 841 | int osmo_sock_init_sa(struct sockaddr *ss, uint16_t type, |
Pablo Neira Ayuso | 0849c9a | 2011-06-09 15:04:30 +0200 | [diff] [blame] | 842 | uint8_t proto, unsigned int flags) |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 843 | { |
| 844 | char host[NI_MAXHOST]; |
| 845 | uint16_t port; |
| 846 | struct sockaddr_in *sin; |
| 847 | struct sockaddr_in6 *sin6; |
| 848 | int s, sa_len; |
| 849 | |
| 850 | /* determine port and host from ss */ |
| 851 | switch (ss->sa_family) { |
| 852 | case AF_INET: |
| 853 | sin = (struct sockaddr_in *) ss; |
| 854 | sa_len = sizeof(struct sockaddr_in); |
| 855 | port = ntohs(sin->sin_port); |
| 856 | break; |
| 857 | case AF_INET6: |
| 858 | sin6 = (struct sockaddr_in6 *) ss; |
| 859 | sa_len = sizeof(struct sockaddr_in6); |
| 860 | port = ntohs(sin6->sin6_port); |
| 861 | break; |
| 862 | default: |
| 863 | return -EINVAL; |
| 864 | } |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 865 | |
| 866 | s = getnameinfo(ss, sa_len, host, NI_MAXHOST, |
| 867 | NULL, 0, NI_NUMERICHOST); |
| 868 | if (s != 0) { |
Philipp Maier | 6f0f560 | 2017-02-09 14:09:06 +0100 | [diff] [blame] | 869 | LOGP(DLGLOBAL, LOGL_ERROR, "getnameinfo failed:" |
| 870 | " %s\n", strerror(errno)); |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 871 | return s; |
| 872 | } |
| 873 | |
Pablo Neira Ayuso | 0849c9a | 2011-06-09 15:04:30 +0200 | [diff] [blame] | 874 | return osmo_sock_init(ss->sa_family, type, proto, host, port, flags); |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 875 | } |
| 876 | |
| 877 | static int sockaddr_equal(const struct sockaddr *a, |
Harald Welte | e476442 | 2011-05-22 12:25:57 +0200 | [diff] [blame] | 878 | const struct sockaddr *b, unsigned int len) |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 879 | { |
| 880 | struct sockaddr_in *sin_a, *sin_b; |
| 881 | struct sockaddr_in6 *sin6_a, *sin6_b; |
| 882 | |
| 883 | if (a->sa_family != b->sa_family) |
| 884 | return 0; |
| 885 | |
| 886 | switch (a->sa_family) { |
| 887 | case AF_INET: |
| 888 | sin_a = (struct sockaddr_in *)a; |
| 889 | sin_b = (struct sockaddr_in *)b; |
| 890 | if (!memcmp(&sin_a->sin_addr, &sin_b->sin_addr, |
| 891 | sizeof(struct in_addr))) |
| 892 | return 1; |
| 893 | break; |
| 894 | case AF_INET6: |
| 895 | sin6_a = (struct sockaddr_in6 *)a; |
| 896 | sin6_b = (struct sockaddr_in6 *)b; |
| 897 | if (!memcmp(&sin6_a->sin6_addr, &sin6_b->sin6_addr, |
| 898 | sizeof(struct in6_addr))) |
| 899 | return 1; |
| 900 | break; |
| 901 | } |
| 902 | return 0; |
| 903 | } |
| 904 | |
Neels Hofmeyr | 87e4550 | 2017-06-20 00:17:59 +0200 | [diff] [blame] | 905 | /*! Determine if the given address is a local address |
Harald Welte | ba6988b | 2011-08-17 12:46:48 +0200 | [diff] [blame] | 906 | * \param[in] addr Socket Address |
| 907 | * \param[in] addrlen Length of socket address in bytes |
| 908 | * \returns 1 if address is local, 0 otherwise. |
| 909 | */ |
Harald Welte | bc32d05 | 2012-04-08 11:31:32 +0200 | [diff] [blame] | 910 | int osmo_sockaddr_is_local(struct sockaddr *addr, unsigned int addrlen) |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 911 | { |
| 912 | struct ifaddrs *ifaddr, *ifa; |
| 913 | |
| 914 | if (getifaddrs(&ifaddr) == -1) { |
Philipp Maier | 6f0f560 | 2017-02-09 14:09:06 +0100 | [diff] [blame] | 915 | LOGP(DLGLOBAL, LOGL_ERROR, "getifaddrs:" |
| 916 | " %s\n", strerror(errno)); |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 917 | return -EIO; |
| 918 | } |
| 919 | |
| 920 | for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) { |
Harald Welte | 4d3a7b1 | 2011-05-24 21:31:53 +0200 | [diff] [blame] | 921 | if (!ifa->ifa_addr) |
| 922 | continue; |
Pau Espin Pedrol | 15753e9 | 2018-04-18 19:57:41 +0200 | [diff] [blame] | 923 | if (sockaddr_equal(ifa->ifa_addr, addr, addrlen)) { |
| 924 | freeifaddrs(ifaddr); |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 925 | return 1; |
Pau Espin Pedrol | 15753e9 | 2018-04-18 19:57:41 +0200 | [diff] [blame] | 926 | } |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 927 | } |
| 928 | |
Pau Espin Pedrol | 15753e9 | 2018-04-18 19:57:41 +0200 | [diff] [blame] | 929 | freeifaddrs(ifaddr); |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 930 | return 0; |
| 931 | } |
Harald Welte | e476442 | 2011-05-22 12:25:57 +0200 | [diff] [blame] | 932 | |
Max | 9d7a247 | 2018-11-20 15:18:31 +0100 | [diff] [blame] | 933 | /*! Convert sockaddr_in to IP address as char string and port as uint16_t. |
| 934 | * \param[out] addr String buffer to write IP address to, or NULL. |
| 935 | * \param[out] addr_len Size of \a addr. |
| 936 | * \param[out] port Pointer to uint16_t to write the port number to, or NULL. |
| 937 | * \param[in] sin Sockaddr to convert. |
| 938 | * \returns the required string buffer size, like osmo_strlcpy(), or 0 if \a addr is NULL. |
| 939 | */ |
| 940 | size_t osmo_sockaddr_in_to_str_and_uint(char *addr, unsigned int addr_len, uint16_t *port, |
| 941 | const struct sockaddr_in *sin) |
| 942 | { |
| 943 | if (port) |
| 944 | *port = ntohs(sin->sin_port); |
| 945 | |
| 946 | if (addr) |
| 947 | return osmo_strlcpy(addr, inet_ntoa(sin->sin_addr), addr_len); |
| 948 | |
| 949 | return 0; |
| 950 | } |
| 951 | |
Neels Hofmeyr | 59f4caf | 2018-07-19 22:13:19 +0200 | [diff] [blame] | 952 | /*! Convert sockaddr to IP address as char string and port as uint16_t. |
| 953 | * \param[out] addr String buffer to write IP address to, or NULL. |
| 954 | * \param[out] addr_len Size of \a addr. |
| 955 | * \param[out] port Pointer to uint16_t to write the port number to, or NULL. |
| 956 | * \param[in] sa Sockaddr to convert. |
| 957 | * \returns the required string buffer size, like osmo_strlcpy(), or 0 if \a addr is NULL. |
| 958 | */ |
| 959 | unsigned int osmo_sockaddr_to_str_and_uint(char *addr, unsigned int addr_len, uint16_t *port, |
| 960 | const struct sockaddr *sa) |
| 961 | { |
| 962 | const struct sockaddr_in *sin = (const struct sockaddr_in *)sa; |
| 963 | |
Max | 9d7a247 | 2018-11-20 15:18:31 +0100 | [diff] [blame] | 964 | return osmo_sockaddr_in_to_str_and_uint(addr, addr_len, port, sin); |
Neels Hofmeyr | 59f4caf | 2018-07-19 22:13:19 +0200 | [diff] [blame] | 965 | } |
| 966 | |
Neels Hofmeyr | 87e4550 | 2017-06-20 00:17:59 +0200 | [diff] [blame] | 967 | /*! Initialize a unix domain socket (including bind/connect) |
Álvaro Neira Ayuso | 5ade61a | 2014-03-24 13:02:00 +0100 | [diff] [blame] | 968 | * \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM |
| 969 | * \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP |
| 970 | * \param[in] socket_path path to identify the socket |
| 971 | * \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT |
Harald Welte | 2d2e2cc | 2016-04-25 12:11:20 +0200 | [diff] [blame] | 972 | * \returns socket fd on success; negative on error |
Álvaro Neira Ayuso | 5ade61a | 2014-03-24 13:02:00 +0100 | [diff] [blame] | 973 | * |
| 974 | * This function creates a new unix domain socket, \a |
| 975 | * type and \a proto and optionally binds or connects it, depending on |
| 976 | * the value of \a flags parameter. |
| 977 | */ |
Eric Wild | eb5769b | 2019-06-27 15:31:17 +0200 | [diff] [blame] | 978 | #if defined(__clang__) && defined(SUN_LEN) |
| 979 | __attribute__((no_sanitize("undefined"))) |
| 980 | #endif |
Álvaro Neira Ayuso | 5ade61a | 2014-03-24 13:02:00 +0100 | [diff] [blame] | 981 | int osmo_sock_unix_init(uint16_t type, uint8_t proto, |
| 982 | const char *socket_path, unsigned int flags) |
| 983 | { |
| 984 | struct sockaddr_un local; |
| 985 | int sfd, rc, on = 1; |
| 986 | unsigned int namelen; |
| 987 | |
| 988 | if ((flags & (OSMO_SOCK_F_BIND | OSMO_SOCK_F_CONNECT)) == |
| 989 | (OSMO_SOCK_F_BIND | OSMO_SOCK_F_CONNECT)) |
| 990 | return -EINVAL; |
| 991 | |
| 992 | local.sun_family = AF_UNIX; |
Stefan Sperling | 6afb3f5 | 2018-09-20 17:21:05 +0200 | [diff] [blame] | 993 | /* When an AF_UNIX socket is bound, sun_path should be NUL-terminated. See unix(7) man page. */ |
| 994 | if (osmo_strlcpy(local.sun_path, socket_path, sizeof(local.sun_path)) >= sizeof(local.sun_path)) { |
Stefan Sperling | 896ff6d | 2018-08-28 14:34:17 +0200 | [diff] [blame] | 995 | LOGP(DLGLOBAL, LOGL_ERROR, "Socket path exceeds maximum length of %zd bytes: %s\n", |
| 996 | sizeof(local.sun_path), socket_path); |
| 997 | return -ENOSPC; |
| 998 | } |
Álvaro Neira Ayuso | 5ade61a | 2014-03-24 13:02:00 +0100 | [diff] [blame] | 999 | |
| 1000 | #if defined(BSD44SOCKETS) || defined(__UNIXWARE__) |
Stefan Sperling | 6afb3f5 | 2018-09-20 17:21:05 +0200 | [diff] [blame] | 1001 | local.sun_len = strlen(local.sun_path); |
Álvaro Neira Ayuso | 5ade61a | 2014-03-24 13:02:00 +0100 | [diff] [blame] | 1002 | #endif |
| 1003 | #if defined(BSD44SOCKETS) || defined(SUN_LEN) |
| 1004 | namelen = SUN_LEN(&local); |
| 1005 | #else |
Stefan Sperling | 6afb3f5 | 2018-09-20 17:21:05 +0200 | [diff] [blame] | 1006 | namelen = strlen(local.sun_path) + |
| 1007 | offsetof(struct sockaddr_un, sun_path); |
Álvaro Neira Ayuso | 5ade61a | 2014-03-24 13:02:00 +0100 | [diff] [blame] | 1008 | #endif |
| 1009 | |
| 1010 | sfd = socket(AF_UNIX, type, proto); |
| 1011 | if (sfd < 0) |
| 1012 | return -1; |
| 1013 | |
| 1014 | if (flags & OSMO_SOCK_F_CONNECT) { |
| 1015 | rc = connect(sfd, (struct sockaddr *)&local, namelen); |
| 1016 | if (rc < 0) |
| 1017 | goto err; |
| 1018 | } else { |
| 1019 | unlink(local.sun_path); |
| 1020 | rc = bind(sfd, (struct sockaddr *)&local, namelen); |
| 1021 | if (rc < 0) |
| 1022 | goto err; |
| 1023 | } |
| 1024 | |
| 1025 | if (flags & OSMO_SOCK_F_NONBLOCK) { |
| 1026 | if (ioctl(sfd, FIONBIO, (unsigned char *)&on) < 0) { |
Philipp Maier | 6f0f560 | 2017-02-09 14:09:06 +0100 | [diff] [blame] | 1027 | LOGP(DLGLOBAL, LOGL_ERROR, |
| 1028 | "cannot set this socket unblocking: %s\n", |
| 1029 | strerror(errno)); |
Álvaro Neira Ayuso | 5ade61a | 2014-03-24 13:02:00 +0100 | [diff] [blame] | 1030 | close(sfd); |
| 1031 | return -EINVAL; |
| 1032 | } |
| 1033 | } |
| 1034 | |
Harald Welte | c47bbda | 2017-07-13 16:13:26 +0200 | [diff] [blame] | 1035 | rc = osmo_sock_init_tail(sfd, type, flags); |
| 1036 | if (rc < 0) { |
| 1037 | close(sfd); |
| 1038 | sfd = -1; |
Álvaro Neira Ayuso | 5ade61a | 2014-03-24 13:02:00 +0100 | [diff] [blame] | 1039 | } |
| 1040 | |
| 1041 | return sfd; |
| 1042 | err: |
| 1043 | close(sfd); |
| 1044 | return -1; |
| 1045 | } |
| 1046 | |
Neels Hofmeyr | 87e4550 | 2017-06-20 00:17:59 +0200 | [diff] [blame] | 1047 | /*! Initialize a unix domain socket and fill \ref osmo_fd |
Álvaro Neira Ayuso | 5ade61a | 2014-03-24 13:02:00 +0100 | [diff] [blame] | 1048 | * \param[out] ofd file descriptor (will be filled in) |
| 1049 | * \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM |
| 1050 | * \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP |
| 1051 | * \param[in] socket_path path to identify the socket |
| 1052 | * \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT |
Harald Welte | 2d2e2cc | 2016-04-25 12:11:20 +0200 | [diff] [blame] | 1053 | * \returns socket fd on success; negative on error |
Álvaro Neira Ayuso | 5ade61a | 2014-03-24 13:02:00 +0100 | [diff] [blame] | 1054 | * |
Vadim Yanitskiy | b606d76 | 2019-06-01 19:02:47 +0700 | [diff] [blame] | 1055 | * This function creates (and optionally binds/connects) a socket |
| 1056 | * using osmo_sock_unix_init, but also fills the ofd structure. |
Álvaro Neira Ayuso | 5ade61a | 2014-03-24 13:02:00 +0100 | [diff] [blame] | 1057 | */ |
| 1058 | int osmo_sock_unix_init_ofd(struct osmo_fd *ofd, uint16_t type, uint8_t proto, |
| 1059 | const char *socket_path, unsigned int flags) |
| 1060 | { |
Max | 862ba65 | 2014-10-13 14:54:25 +0200 | [diff] [blame] | 1061 | return osmo_fd_init_ofd(ofd, osmo_sock_unix_init(type, proto, socket_path, flags)); |
Álvaro Neira Ayuso | 5ade61a | 2014-03-24 13:02:00 +0100 | [diff] [blame] | 1062 | } |
| 1063 | |
Neels Hofmeyr | 0145751 | 2018-12-12 01:48:54 +0100 | [diff] [blame] | 1064 | /*! Get the IP and/or port number on socket in separate string buffers. |
Oliver Smith | 7acd5d0 | 2018-10-25 11:16:36 +0200 | [diff] [blame] | 1065 | * \param[in] fd file descriptor of socket |
| 1066 | * \param[out] ip IP address (will be filled in when not NULL) |
| 1067 | * \param[in] ip_len length of the ip buffer |
| 1068 | * \param[out] port number (will be filled in when not NULL) |
| 1069 | * \param[in] port_len length of the port buffer |
| 1070 | * \param[in] local (true) or remote (false) name will get looked at |
| 1071 | * \returns 0 on success; negative otherwise |
| 1072 | */ |
Neels Hofmeyr | 0145751 | 2018-12-12 01:48:54 +0100 | [diff] [blame] | 1073 | int osmo_sock_get_ip_and_port(int fd, char *ip, size_t ip_len, char *port, size_t port_len, bool local) |
Oliver Smith | 7acd5d0 | 2018-10-25 11:16:36 +0200 | [diff] [blame] | 1074 | { |
Pau Espin Pedrol | ed42a88 | 2020-08-21 15:39:17 +0200 | [diff] [blame] | 1075 | struct sockaddr_storage sa; |
Oliver Smith | 7acd5d0 | 2018-10-25 11:16:36 +0200 | [diff] [blame] | 1076 | socklen_t len = sizeof(sa); |
Oliver Smith | 860651e | 2018-10-30 14:31:57 +0100 | [diff] [blame] | 1077 | char ipbuf[INET6_ADDRSTRLEN], portbuf[6]; |
Oliver Smith | 7acd5d0 | 2018-10-25 11:16:36 +0200 | [diff] [blame] | 1078 | int rc; |
| 1079 | |
Pau Espin Pedrol | ed42a88 | 2020-08-21 15:39:17 +0200 | [diff] [blame] | 1080 | rc = local ? getsockname(fd, (struct sockaddr*)&sa, &len) : getpeername(fd, (struct sockaddr*)&sa, &len); |
Oliver Smith | 7acd5d0 | 2018-10-25 11:16:36 +0200 | [diff] [blame] | 1081 | if (rc < 0) |
| 1082 | return rc; |
| 1083 | |
Pau Espin Pedrol | ed42a88 | 2020-08-21 15:39:17 +0200 | [diff] [blame] | 1084 | rc = getnameinfo((const struct sockaddr*)&sa, len, ipbuf, sizeof(ipbuf), |
Oliver Smith | 7acd5d0 | 2018-10-25 11:16:36 +0200 | [diff] [blame] | 1085 | portbuf, sizeof(portbuf), |
| 1086 | NI_NUMERICHOST | NI_NUMERICSERV); |
| 1087 | if (rc < 0) |
| 1088 | return rc; |
| 1089 | |
| 1090 | if (ip) |
| 1091 | strncpy(ip, ipbuf, ip_len); |
| 1092 | if (port) |
| 1093 | strncpy(port, portbuf, port_len); |
| 1094 | return 0; |
| 1095 | } |
| 1096 | |
| 1097 | /*! Get local IP address on socket |
| 1098 | * \param[in] fd file descriptor of socket |
| 1099 | * \param[out] ip IP address (will be filled in) |
| 1100 | * \param[in] len length of the output buffer |
| 1101 | * \returns 0 on success; negative otherwise |
| 1102 | */ |
| 1103 | int osmo_sock_get_local_ip(int fd, char *ip, size_t len) |
| 1104 | { |
Neels Hofmeyr | 0145751 | 2018-12-12 01:48:54 +0100 | [diff] [blame] | 1105 | return osmo_sock_get_ip_and_port(fd, ip, len, NULL, 0, true); |
Oliver Smith | 7acd5d0 | 2018-10-25 11:16:36 +0200 | [diff] [blame] | 1106 | } |
| 1107 | |
| 1108 | /*! Get local port on socket |
| 1109 | * \param[in] fd file descriptor of socket |
| 1110 | * \param[out] port number (will be filled in) |
| 1111 | * \param[in] len length of the output buffer |
| 1112 | * \returns 0 on success; negative otherwise |
| 1113 | */ |
| 1114 | int osmo_sock_get_local_ip_port(int fd, char *port, size_t len) |
| 1115 | { |
Neels Hofmeyr | 0145751 | 2018-12-12 01:48:54 +0100 | [diff] [blame] | 1116 | return osmo_sock_get_ip_and_port(fd, NULL, 0, port, len, true); |
Oliver Smith | 7acd5d0 | 2018-10-25 11:16:36 +0200 | [diff] [blame] | 1117 | } |
| 1118 | |
| 1119 | /*! Get remote IP address on socket |
| 1120 | * \param[in] fd file descriptor of socket |
| 1121 | * \param[out] ip IP address (will be filled in) |
| 1122 | * \param[in] len length of the output buffer |
| 1123 | * \returns 0 on success; negative otherwise |
| 1124 | */ |
| 1125 | int osmo_sock_get_remote_ip(int fd, char *ip, size_t len) |
| 1126 | { |
Neels Hofmeyr | 0145751 | 2018-12-12 01:48:54 +0100 | [diff] [blame] | 1127 | return osmo_sock_get_ip_and_port(fd, ip, len, NULL, 0, false); |
Oliver Smith | 7acd5d0 | 2018-10-25 11:16:36 +0200 | [diff] [blame] | 1128 | } |
| 1129 | |
| 1130 | /*! Get remote port on socket |
| 1131 | * \param[in] fd file descriptor of socket |
| 1132 | * \param[out] port number (will be filled in) |
| 1133 | * \param[in] len length of the output buffer |
| 1134 | * \returns 0 on success; negative otherwise |
| 1135 | */ |
| 1136 | int osmo_sock_get_remote_ip_port(int fd, char *port, size_t len) |
| 1137 | { |
Neels Hofmeyr | 0145751 | 2018-12-12 01:48:54 +0100 | [diff] [blame] | 1138 | return osmo_sock_get_ip_and_port(fd, NULL, 0, port, len, false); |
Oliver Smith | 7acd5d0 | 2018-10-25 11:16:36 +0200 | [diff] [blame] | 1139 | } |
| 1140 | |
Neels Hofmeyr | 0145751 | 2018-12-12 01:48:54 +0100 | [diff] [blame] | 1141 | /*! Get address/port information on socket in dyn-alloc string like "(r=1.2.3.4:5<->l=6.7.8.9:10)". |
| 1142 | * Usually, it is better to use osmo_sock_get_name2() for a static string buffer or osmo_sock_get_name_buf() for a |
| 1143 | * caller provided string buffer, to avoid the dynamic talloc allocation. |
Harald Welte | 48f5583 | 2017-01-26 00:03:10 +0100 | [diff] [blame] | 1144 | * \param[in] ctx talloc context from which to allocate string buffer |
| 1145 | * \param[in] fd file descriptor of socket |
Neels Hofmeyr | 0145751 | 2018-12-12 01:48:54 +0100 | [diff] [blame] | 1146 | * \returns string identifying the connection of this socket, talloc'd from ctx. |
Harald Welte | 48f5583 | 2017-01-26 00:03:10 +0100 | [diff] [blame] | 1147 | */ |
Harald Welte | c0dfc9d | 2019-03-18 18:29:43 +0100 | [diff] [blame] | 1148 | char *osmo_sock_get_name(const void *ctx, int fd) |
Harald Welte | 48f5583 | 2017-01-26 00:03:10 +0100 | [diff] [blame] | 1149 | { |
Philipp Maier | 64b51eb | 2019-01-14 11:59:11 +0100 | [diff] [blame] | 1150 | char str[OSMO_SOCK_NAME_MAXLEN]; |
Neels Hofmeyr | 0145751 | 2018-12-12 01:48:54 +0100 | [diff] [blame] | 1151 | int rc; |
| 1152 | rc = osmo_sock_get_name_buf(str, sizeof(str), fd); |
| 1153 | if (rc <= 0) |
| 1154 | return NULL; |
| 1155 | return talloc_asprintf(ctx, "(%s)", str); |
| 1156 | } |
| 1157 | |
| 1158 | /*! Get address/port information on socket in provided string buffer, like "r=1.2.3.4:5<->l=6.7.8.9:10". |
| 1159 | * This does not include braces like osmo_sock_get_name(). |
| 1160 | * \param[out] str Destination string buffer. |
| 1161 | * \param[in] str_len sizeof(str). |
| 1162 | * \param[in] fd File descriptor of socket. |
| 1163 | * \return String length as returned by snprintf(), or negative on error. |
| 1164 | */ |
| 1165 | int osmo_sock_get_name_buf(char *str, size_t str_len, int fd) |
| 1166 | { |
Oliver Smith | 860651e | 2018-10-30 14:31:57 +0100 | [diff] [blame] | 1167 | char hostbuf_l[INET6_ADDRSTRLEN], hostbuf_r[INET6_ADDRSTRLEN]; |
| 1168 | char portbuf_l[6], portbuf_r[6]; |
Neels Hofmeyr | 0145751 | 2018-12-12 01:48:54 +0100 | [diff] [blame] | 1169 | int rc; |
Harald Welte | 48f5583 | 2017-01-26 00:03:10 +0100 | [diff] [blame] | 1170 | |
Oliver Smith | 7acd5d0 | 2018-10-25 11:16:36 +0200 | [diff] [blame] | 1171 | /* get local */ |
Harald Welte | ea9ea52 | 2019-05-10 09:28:24 +0200 | [diff] [blame] | 1172 | if ((rc = osmo_sock_get_ip_and_port(fd, hostbuf_l, sizeof(hostbuf_l), portbuf_l, sizeof(portbuf_l), true))) { |
| 1173 | osmo_strlcpy(str, "<error-in-getsockname>", str_len); |
Neels Hofmeyr | 0145751 | 2018-12-12 01:48:54 +0100 | [diff] [blame] | 1174 | return rc; |
Harald Welte | ea9ea52 | 2019-05-10 09:28:24 +0200 | [diff] [blame] | 1175 | } |
Harald Welte | 48f5583 | 2017-01-26 00:03:10 +0100 | [diff] [blame] | 1176 | |
Oliver Smith | 7acd5d0 | 2018-10-25 11:16:36 +0200 | [diff] [blame] | 1177 | /* get remote */ |
Neels Hofmeyr | 0145751 | 2018-12-12 01:48:54 +0100 | [diff] [blame] | 1178 | if (osmo_sock_get_ip_and_port(fd, hostbuf_r, sizeof(hostbuf_r), portbuf_r, sizeof(portbuf_r), false) != 0) |
| 1179 | return snprintf(str, str_len, "r=NULL<->l=%s:%s", hostbuf_l, portbuf_l); |
Harald Welte | 48f5583 | 2017-01-26 00:03:10 +0100 | [diff] [blame] | 1180 | |
Neels Hofmeyr | 0145751 | 2018-12-12 01:48:54 +0100 | [diff] [blame] | 1181 | return snprintf(str, str_len, "r=%s:%s<->l=%s:%s", hostbuf_r, portbuf_r, hostbuf_l, portbuf_l); |
| 1182 | } |
| 1183 | |
| 1184 | /*! Get address/port information on socket in static string, like "r=1.2.3.4:5<->l=6.7.8.9:10". |
| 1185 | * This does not include braces like osmo_sock_get_name(). |
| 1186 | * \param[in] fd File descriptor of socket. |
| 1187 | * \return Static string buffer containing the result. |
| 1188 | */ |
| 1189 | const char *osmo_sock_get_name2(int fd) |
| 1190 | { |
Harald Welte | 171ef82 | 2019-03-28 10:49:05 +0100 | [diff] [blame] | 1191 | static __thread char str[OSMO_SOCK_NAME_MAXLEN]; |
Neels Hofmeyr | 0145751 | 2018-12-12 01:48:54 +0100 | [diff] [blame] | 1192 | osmo_sock_get_name_buf(str, sizeof(str), fd); |
| 1193 | return str; |
Harald Welte | 48f5583 | 2017-01-26 00:03:10 +0100 | [diff] [blame] | 1194 | } |
| 1195 | |
Harald Welte | 179f357 | 2019-03-18 18:38:47 +0100 | [diff] [blame] | 1196 | /*! Get address/port information on socket in static string, like "r=1.2.3.4:5<->l=6.7.8.9:10". |
| 1197 | * This does not include braces like osmo_sock_get_name(). |
| 1198 | * \param[in] fd File descriptor of socket. |
| 1199 | * \return Static string buffer containing the result. |
| 1200 | */ |
| 1201 | char *osmo_sock_get_name2_c(const void *ctx, int fd) |
| 1202 | { |
| 1203 | char *str = talloc_size(ctx, OSMO_SOCK_NAME_MAXLEN); |
| 1204 | if (!str) |
| 1205 | return NULL; |
Vadim Yanitskiy | 4f619c2 | 2019-04-12 21:48:07 +0700 | [diff] [blame] | 1206 | osmo_sock_get_name_buf(str, OSMO_SOCK_NAME_MAXLEN, fd); |
Harald Welte | 179f357 | 2019-03-18 18:38:47 +0100 | [diff] [blame] | 1207 | return str; |
| 1208 | } |
| 1209 | |
Harald Welte | e30d7e6 | 2017-07-13 16:02:50 +0200 | [diff] [blame] | 1210 | static int sock_get_domain(int fd) |
| 1211 | { |
| 1212 | int domain; |
| 1213 | #ifdef SO_DOMAIN |
| 1214 | socklen_t dom_len = sizeof(domain); |
| 1215 | int rc; |
| 1216 | |
| 1217 | rc = getsockopt(fd, SOL_SOCKET, SO_DOMAIN, &domain, &dom_len); |
| 1218 | if (rc < 0) |
| 1219 | return rc; |
| 1220 | #else |
| 1221 | /* This of course sucks, but what shall we do on OSs like |
| 1222 | * FreeBSD that don't seem to expose a method by which one can |
| 1223 | * learn the address family of a socket? */ |
| 1224 | domain = AF_INET; |
| 1225 | #endif |
| 1226 | return domain; |
| 1227 | } |
| 1228 | |
| 1229 | |
| 1230 | /*! Activate or de-activate local loop-back of transmitted multicast packets |
| 1231 | * \param[in] fd file descriptor of related socket |
| 1232 | * \param[in] enable Enable (true) or disable (false) loop-back |
| 1233 | * \returns 0 on success; negative otherwise */ |
| 1234 | int osmo_sock_mcast_loop_set(int fd, bool enable) |
| 1235 | { |
| 1236 | int domain, loop = 0; |
| 1237 | |
| 1238 | if (enable) |
| 1239 | loop = 1; |
| 1240 | |
| 1241 | domain = sock_get_domain(fd); |
| 1242 | if (domain < 0) |
| 1243 | return domain; |
| 1244 | |
| 1245 | switch (domain) { |
| 1246 | case AF_INET: |
| 1247 | return setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)); |
| 1248 | case AF_INET6: |
| 1249 | return setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &loop, sizeof(loop)); |
| 1250 | default: |
| 1251 | return -EINVAL; |
| 1252 | } |
| 1253 | } |
| 1254 | |
| 1255 | /*! Set the TTL of outbound multicast packets |
| 1256 | * \param[in] fd file descriptor of related socket |
| 1257 | * \param[in] ttl TTL of to-be-sent multicast packets |
| 1258 | * \returns 0 on success; negative otherwise */ |
| 1259 | int osmo_sock_mcast_ttl_set(int fd, uint8_t ttl) |
| 1260 | { |
| 1261 | int domain, ttli = ttl; |
| 1262 | |
| 1263 | domain = sock_get_domain(fd); |
| 1264 | if (domain < 0) |
| 1265 | return domain; |
| 1266 | |
| 1267 | switch (domain) { |
| 1268 | case AF_INET: |
| 1269 | return setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttli, sizeof(ttli)); |
| 1270 | case AF_INET6: |
| 1271 | return setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttli, sizeof(ttli)); |
| 1272 | default: |
| 1273 | return -EINVAL; |
| 1274 | } |
| 1275 | } |
| 1276 | |
Harald Welte | 44b9926 | 2020-03-07 14:59:05 +0100 | [diff] [blame] | 1277 | /*! Set the network device to which we should bind the multicast socket |
| 1278 | * \param[in] fd file descriptor of related socket |
| 1279 | * \param[in] ifname name of network interface to user for multicast |
| 1280 | * \returns 0 on success; negative otherwise */ |
| 1281 | int osmo_sock_mcast_iface_set(int fd, const char *ifname) |
| 1282 | { |
| 1283 | unsigned int ifindex; |
| 1284 | struct ip_mreqn mr; |
| 1285 | |
| 1286 | /* first, resolve interface name to ifindex */ |
| 1287 | ifindex = if_nametoindex(ifname); |
| 1288 | if (ifindex == 0) |
| 1289 | return -errno; |
| 1290 | |
| 1291 | /* next, configure kernel to use that ifindex for this sockets multicast traffic */ |
| 1292 | memset(&mr, 0, sizeof(mr)); |
| 1293 | mr.imr_ifindex = ifindex; |
| 1294 | return setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF, &mr, sizeof(mr)); |
| 1295 | } |
| 1296 | |
| 1297 | |
Harald Welte | e30d7e6 | 2017-07-13 16:02:50 +0200 | [diff] [blame] | 1298 | /*! Enable/disable receiving all multicast packets, even for non-subscribed groups |
| 1299 | * \param[in] fd file descriptor of related socket |
| 1300 | * \param[in] enable Enable or Disable receiving of all packets |
| 1301 | * \returns 0 on success; negative otherwise */ |
| 1302 | int osmo_sock_mcast_all_set(int fd, bool enable) |
| 1303 | { |
| 1304 | int domain, all = 0; |
| 1305 | |
| 1306 | if (enable) |
| 1307 | all = 1; |
| 1308 | |
| 1309 | domain = sock_get_domain(fd); |
| 1310 | if (domain < 0) |
| 1311 | return domain; |
| 1312 | |
| 1313 | switch (domain) { |
| 1314 | case AF_INET: |
| 1315 | #ifdef IP_MULTICAST_ALL |
| 1316 | return setsockopt(fd, IPPROTO_IP, IP_MULTICAST_ALL, &all, sizeof(all)); |
| 1317 | #endif |
| 1318 | case AF_INET6: |
| 1319 | /* there seems no equivalent ?!? */ |
| 1320 | default: |
| 1321 | return -EINVAL; |
| 1322 | } |
| 1323 | } |
| 1324 | |
| 1325 | /* FreeBSD calls the socket option differently */ |
| 1326 | #if !defined(IPV6_ADD_MEMBERSHIP) && defined(IPV6_JOIN_GROUP) |
| 1327 | #define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP |
| 1328 | #endif |
| 1329 | |
| 1330 | /*! Subscribe to the given IP multicast group |
| 1331 | * \param[in] fd file descriptor of related scoket |
| 1332 | * \param[in] grp_addr ASCII representation of the multicast group address |
| 1333 | * \returns 0 on success; negative otherwise */ |
| 1334 | int osmo_sock_mcast_subscribe(int fd, const char *grp_addr) |
| 1335 | { |
| 1336 | int rc, domain; |
| 1337 | struct ip_mreq mreq; |
| 1338 | struct ipv6_mreq mreq6; |
| 1339 | struct in6_addr i6a; |
| 1340 | |
| 1341 | domain = sock_get_domain(fd); |
| 1342 | if (domain < 0) |
| 1343 | return domain; |
| 1344 | |
| 1345 | switch (domain) { |
| 1346 | case AF_INET: |
| 1347 | memset(&mreq, 0, sizeof(mreq)); |
| 1348 | mreq.imr_multiaddr.s_addr = inet_addr(grp_addr); |
| 1349 | mreq.imr_interface.s_addr = htonl(INADDR_ANY); |
| 1350 | return setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)); |
| 1351 | #ifdef IPV6_ADD_MEMBERSHIP |
| 1352 | case AF_INET6: |
| 1353 | memset(&mreq6, 0, sizeof(mreq6)); |
| 1354 | rc = inet_pton(AF_INET6, grp_addr, (void *)&i6a); |
| 1355 | if (rc < 0) |
| 1356 | return -EINVAL; |
| 1357 | mreq6.ipv6mr_multiaddr = i6a; |
| 1358 | return setsockopt(fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)); |
| 1359 | #endif |
| 1360 | default: |
| 1361 | return -EINVAL; |
| 1362 | } |
| 1363 | } |
| 1364 | |
Philipp Maier | 2d2490e | 2017-10-20 19:41:26 +0200 | [diff] [blame] | 1365 | /*! Determine the matching local IP-address for a given remote IP-Address. |
| 1366 | * \param[out] local_ip caller provided memory for resulting local IP-address |
| 1367 | * \param[in] remote_ip remote IP-address |
Philipp Maier | 2d2490e | 2017-10-20 19:41:26 +0200 | [diff] [blame] | 1368 | * \returns 0 on success; negative otherwise |
| 1369 | * |
| 1370 | * The function accepts IPv4 and IPv6 address strings. The caller must provide |
| 1371 | * at least INET6_ADDRSTRLEN bytes for local_ip if an IPv6 is expected as |
| 1372 | * as result. For IPv4 addresses the required amount is INET_ADDRSTRLEN. */ |
| 1373 | int osmo_sock_local_ip(char *local_ip, const char *remote_ip) |
| 1374 | { |
| 1375 | int sfd; |
| 1376 | int rc; |
| 1377 | struct addrinfo addrinfo_hint; |
| 1378 | struct addrinfo *addrinfo = NULL; |
| 1379 | struct sockaddr_in local_addr; |
| 1380 | socklen_t local_addr_len; |
| 1381 | uint16_t family; |
| 1382 | |
| 1383 | /* Find out the address family (AF_INET or AF_INET6?) */ |
| 1384 | memset(&addrinfo_hint, '\0', sizeof(addrinfo_hint)); |
| 1385 | addrinfo_hint.ai_family = PF_UNSPEC; |
| 1386 | addrinfo_hint.ai_flags = AI_NUMERICHOST; |
| 1387 | rc = getaddrinfo(remote_ip, NULL, &addrinfo_hint, &addrinfo); |
| 1388 | if (rc) |
| 1389 | return -EINVAL; |
| 1390 | family = addrinfo->ai_family; |
| 1391 | freeaddrinfo(addrinfo); |
| 1392 | |
| 1393 | /* Connect a dummy socket to trick the kernel into determining the |
| 1394 | * ip-address of the interface that would be used if we would send |
| 1395 | * out an actual packet */ |
| 1396 | sfd = osmo_sock_init2(family, SOCK_DGRAM, IPPROTO_UDP, NULL, 0, remote_ip, 0, OSMO_SOCK_F_CONNECT); |
| 1397 | if (sfd < 0) |
| 1398 | return -EINVAL; |
| 1399 | |
| 1400 | /* Request the IP address of the interface that the kernel has |
| 1401 | * actually choosen. */ |
| 1402 | memset(&local_addr, 0, sizeof(local_addr)); |
| 1403 | local_addr_len = sizeof(local_addr); |
| 1404 | rc = getsockname(sfd, (struct sockaddr *)&local_addr, &local_addr_len); |
Philipp Maier | 8b7975b | 2018-01-22 15:38:07 +0100 | [diff] [blame] | 1405 | close(sfd); |
Philipp Maier | 2d2490e | 2017-10-20 19:41:26 +0200 | [diff] [blame] | 1406 | if (rc < 0) |
| 1407 | return -EINVAL; |
| 1408 | if (local_addr.sin_family == AF_INET) |
Philipp Maier | 91cfda8 | 2018-01-22 16:56:27 +0100 | [diff] [blame] | 1409 | inet_ntop(AF_INET, &local_addr.sin_addr, local_ip, INET_ADDRSTRLEN); |
Philipp Maier | 2d2490e | 2017-10-20 19:41:26 +0200 | [diff] [blame] | 1410 | else if (local_addr.sin_family == AF_INET6) |
Philipp Maier | 91cfda8 | 2018-01-22 16:56:27 +0100 | [diff] [blame] | 1411 | inet_ntop(AF_INET6, &local_addr.sin_addr, local_ip, INET6_ADDRSTRLEN); |
Philipp Maier | 2d2490e | 2017-10-20 19:41:26 +0200 | [diff] [blame] | 1412 | else |
| 1413 | return -EINVAL; |
| 1414 | |
| 1415 | return 0; |
| 1416 | } |
| 1417 | |
Harald Welte | e476442 | 2011-05-22 12:25:57 +0200 | [diff] [blame] | 1418 | #endif /* HAVE_SYS_SOCKET_H */ |
Harald Welte | ba6988b | 2011-08-17 12:46:48 +0200 | [diff] [blame] | 1419 | |
Sylvain Munaut | dca7d2c | 2012-04-18 21:53:23 +0200 | [diff] [blame] | 1420 | /*! @} */ |