| /* |
| * (C) 2011-2017 by Harald Welte <laforge@gnumonks.org> |
| * |
| * All Rights Reserved |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| */ |
| |
| #include "../config.h" |
| |
| /*! \addtogroup socket |
| * @{ |
| * Osmocom socket convenience functions. |
| * |
| * \file socket.c */ |
| |
| #ifdef HAVE_SYS_SOCKET_H |
| |
| #include <osmocom/core/logging.h> |
| #include <osmocom/core/select.h> |
| #include <osmocom/core/socket.h> |
| #include <osmocom/core/talloc.h> |
| #include <osmocom/core/utils.h> |
| |
| #include <sys/ioctl.h> |
| #include <sys/socket.h> |
| #include <sys/types.h> |
| #include <sys/un.h> |
| #include <net/if.h> |
| |
| #include <netinet/in.h> |
| #include <arpa/inet.h> |
| |
| #include <stdio.h> |
| #include <unistd.h> |
| #include <stdint.h> |
| #include <string.h> |
| #include <errno.h> |
| #include <netdb.h> |
| #include <ifaddrs.h> |
| |
| #ifdef HAVE_LIBSCTP |
| #include <netinet/sctp.h> |
| #endif |
| |
| static struct addrinfo *addrinfo_helper(uint16_t family, uint16_t type, uint8_t proto, |
| const char *host, uint16_t port, bool passive) |
| { |
| struct addrinfo hints, *result, *rp; |
| char portbuf[6]; |
| int rc; |
| |
| snprintf(portbuf, sizeof(portbuf), "%u", port); |
| memset(&hints, 0, sizeof(struct addrinfo)); |
| hints.ai_family = family; |
| if (type == SOCK_RAW) { |
| /* Workaround for glibc, that returns EAI_SERVICE (-8) if |
| * SOCK_RAW and IPPROTO_GRE is used. |
| * http://sourceware.org/bugzilla/show_bug.cgi?id=15015 |
| */ |
| hints.ai_socktype = SOCK_DGRAM; |
| hints.ai_protocol = IPPROTO_UDP; |
| } else { |
| hints.ai_socktype = type; |
| hints.ai_protocol = proto; |
| } |
| |
| if (passive) |
| hints.ai_flags |= AI_PASSIVE; |
| |
| rc = getaddrinfo(host, portbuf, &hints, &result); |
| if (rc != 0) { |
| LOGP(DLGLOBAL, LOGL_ERROR, "getaddrinfo returned NULL: %s:%u: %s\n", |
| host, port, strerror(errno)); |
| return NULL; |
| } |
| |
| for (rp = result; rp != NULL; rp = rp->ai_next) { |
| /* Workaround for glibc again */ |
| if (type == SOCK_RAW) { |
| rp->ai_socktype = SOCK_RAW; |
| rp->ai_protocol = proto; |
| } |
| } |
| |
| return result; |
| } |
| |
| #ifdef HAVE_LIBSCTP |
| /*! Retrieve an array of addrinfo with specified hints, one for each host in the hosts array. |
| * \param[out] addrinfo array of addrinfo pointers, will be filled by the function on success. |
| * Its size must be at least the one of hosts. |
| * \param[in] family Socket family like AF_INET, AF_INET6. |
| * \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM. |
| * \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP. |
| * \param[in] hosts array of char pointers (strings) containing the addresses to query. |
| * \param[in] host_cnt length of the hosts array (in items). |
| * \param[in] port port number in host byte order. |
| * \param[in] passive whether to include the AI_PASSIVE flag in getaddrinfo() hints. |
| * \returns 0 is returned on success together with a filled addrinfo array; negative on error |
| */ |
| static int addrinfo_helper_multi(struct addrinfo **addrinfo, uint16_t family, uint16_t type, uint8_t proto, |
| const char **hosts, size_t host_cnt, uint16_t port, bool passive) |
| { |
| int i, j; |
| |
| for (i = 0; i < host_cnt; i++) { |
| addrinfo[i] = addrinfo_helper(family, type, proto, hosts[i], port, passive); |
| if (!addrinfo[i]) { |
| for (j = 0; j < i; j++) |
| freeaddrinfo(addrinfo[j]); |
| return -EINVAL; |
| } |
| } |
| return 0; |
| } |
| #endif /* HAVE_LIBSCTP*/ |
| |
| static int socket_helper(const struct addrinfo *rp, unsigned int flags) |
| { |
| int sfd, on = 1; |
| |
| sfd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol); |
| if (sfd == -1) { |
| LOGP(DLGLOBAL, LOGL_ERROR, |
| "unable to create socket: %s\n", strerror(errno)); |
| return sfd; |
| } |
| if (flags & OSMO_SOCK_F_NONBLOCK) { |
| if (ioctl(sfd, FIONBIO, (unsigned char *)&on) < 0) { |
| LOGP(DLGLOBAL, LOGL_ERROR, |
| "cannot set this socket unblocking: %s\n", |
| strerror(errno)); |
| close(sfd); |
| sfd = -EINVAL; |
| } |
| } |
| return sfd; |
| } |
| |
| #ifdef HAVE_LIBSCTP |
| /* Fill buf with a string representation of the address set, in the form: |
| * buf_len == 0: "()" |
| * buf_len == 1: "hostA" |
| * buf_len >= 2: (hostA|hostB|...|...) |
| */ |
| static int multiaddr_snprintf(char* buf, size_t buf_len, const char **hosts, size_t host_cnt) |
| { |
| int len = 0, offset = 0, rem = buf_len; |
| int ret, i; |
| char *after; |
| |
| if (buf_len < 3) |
| return -EINVAL; |
| |
| if (host_cnt != 1) { |
| ret = snprintf(buf, rem, "("); |
| if (ret < 0) |
| return ret; |
| OSMO_SNPRINTF_RET(ret, rem, offset, len); |
| } |
| for (i = 0; i < host_cnt; i++) { |
| if (host_cnt == 1) |
| after = ""; |
| else |
| after = (i == (host_cnt - 1)) ? ")" : "|"; |
| ret = snprintf(buf + offset, rem, "%s%s", hosts[i] ? : "0.0.0.0", after); |
| OSMO_SNPRINTF_RET(ret, rem, offset, len); |
| } |
| |
| return len; |
| } |
| #endif /* HAVE_LIBSCTP */ |
| |
| static int osmo_sock_init_tail(int fd, uint16_t type, unsigned int flags) |
| { |
| int rc; |
| |
| /* Make sure to call 'listen' on a bound, connection-oriented sock */ |
| if ((flags & (OSMO_SOCK_F_BIND|OSMO_SOCK_F_CONNECT)) == OSMO_SOCK_F_BIND) { |
| switch (type) { |
| case SOCK_STREAM: |
| case SOCK_SEQPACKET: |
| rc = listen(fd, 10); |
| if (rc < 0) { |
| LOGP(DLGLOBAL, LOGL_ERROR, "unable to listen on socket: %s\n", |
| strerror(errno)); |
| return rc; |
| } |
| break; |
| } |
| } |
| |
| if (flags & OSMO_SOCK_F_NO_MCAST_LOOP) { |
| rc = osmo_sock_mcast_loop_set(fd, false); |
| if (rc < 0) { |
| LOGP(DLGLOBAL, LOGL_ERROR, "unable to disable multicast loop: %s\n", |
| strerror(errno)); |
| return rc; |
| } |
| } |
| |
| if (flags & OSMO_SOCK_F_NO_MCAST_ALL) { |
| rc = osmo_sock_mcast_all_set(fd, false); |
| if (rc < 0) { |
| LOGP(DLGLOBAL, LOGL_ERROR, "unable to disable receive of all multicast: %s\n", |
| strerror(errno)); |
| /* do not abort here, as this is just an |
| * optional additional optimization that only |
| * exists on Linux only */ |
| } |
| } |
| return 0; |
| } |
| |
| /*! Initialize a socket (including bind and/or connect) |
| * \param[in] family Address Family like AF_INET, AF_INET6, AF_UNSPEC |
| * \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM |
| * \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP |
| * \param[in] local_host local host name or IP address in string form |
| * \param[in] local_port local port number in host byte order |
| * \param[in] remote_host remote host name or IP address in string form |
| * \param[in] remote_port remote port number in host byte order |
| * \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT |
| * \returns socket file descriptor on success; negative on error |
| * |
| * This function creates a new socket of the designated \a family, \a |
| * type and \a proto and optionally binds it to the \a local_host and \a |
| * local_port as well as optionally connects it to the \a remote_host |
| * and \q remote_port, depending on the value * of \a flags parameter. |
| * |
| * As opposed to \ref osmo_sock_init(), this function allows to combine |
| * the \ref OSMO_SOCK_F_BIND and \ref OSMO_SOCK_F_CONNECT flags. This |
| * is useful if you want to connect to a remote host/port, but still |
| * want to bind that socket to either a specific local alias IP and/or a |
| * specific local source port. |
| * |
| * You must specify either \ref OSMO_SOCK_F_BIND, or \ref |
| * OSMO_SOCK_F_CONNECT, or both. |
| * |
| * If \ref OSMO_SOCK_F_NONBLOCK is specified, the socket will be set to |
| * non-blocking mode. |
| */ |
| int osmo_sock_init2(uint16_t family, uint16_t type, uint8_t proto, |
| const char *local_host, uint16_t local_port, |
| const char *remote_host, uint16_t remote_port, unsigned int flags) |
| { |
| struct addrinfo *result, *rp; |
| int sfd = -1, rc, on = 1; |
| |
| if ((flags & (OSMO_SOCK_F_BIND | OSMO_SOCK_F_CONNECT)) == 0) { |
| LOGP(DLGLOBAL, LOGL_ERROR, "invalid: you have to specify either " |
| "BIND or CONNECT flags\n"); |
| return -EINVAL; |
| } |
| |
| /* figure out local side of socket */ |
| if (flags & OSMO_SOCK_F_BIND) { |
| result = addrinfo_helper(family, type, proto, local_host, local_port, true); |
| if (!result) |
| return -EINVAL; |
| |
| for (rp = result; rp != NULL; rp = rp->ai_next) { |
| sfd = socket_helper(rp, flags); |
| if (sfd < 0) |
| continue; |
| |
| if (proto != IPPROTO_UDP || flags & OSMO_SOCK_F_UDP_REUSEADDR) { |
| rc = setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, |
| &on, sizeof(on)); |
| if (rc < 0) { |
| LOGP(DLGLOBAL, LOGL_ERROR, |
| "cannot setsockopt socket:" |
| " %s:%u: %s\n", |
| local_host, local_port, |
| strerror(errno)); |
| close(sfd); |
| continue; |
| } |
| } |
| |
| if (bind(sfd, rp->ai_addr, rp->ai_addrlen) == -1) { |
| LOGP(DLGLOBAL, LOGL_ERROR, "unable to bind socket: %s:%u: %s\n", |
| local_host, local_port, strerror(errno)); |
| close(sfd); |
| continue; |
| } |
| break; |
| } |
| freeaddrinfo(result); |
| if (rp == NULL) { |
| LOGP(DLGLOBAL, LOGL_ERROR, "no suitable local addr found for: %s:%u\n", |
| local_host, local_port); |
| return -ENODEV; |
| } |
| } |
| |
| /* Reached this point, if OSMO_SOCK_F_BIND then sfd is valid (>=0) or it |
| was already closed and func returned. If OSMO_SOCK_F_BIND is not |
| set, then sfd = -1 */ |
| |
| /* figure out remote side of socket */ |
| if (flags & OSMO_SOCK_F_CONNECT) { |
| result = addrinfo_helper(family, type, proto, remote_host, remote_port, false); |
| if (!result) { |
| if (sfd >= 0) |
| close(sfd); |
| return -EINVAL; |
| } |
| |
| for (rp = result; rp != NULL; rp = rp->ai_next) { |
| if (sfd < 0) { |
| sfd = socket_helper(rp, flags); |
| if (sfd < 0) |
| continue; |
| } |
| |
| rc = connect(sfd, rp->ai_addr, rp->ai_addrlen); |
| if (rc != 0 && errno != EINPROGRESS) { |
| LOGP(DLGLOBAL, LOGL_ERROR, "unable to connect socket: %s:%u: %s\n", |
| remote_host, remote_port, strerror(errno)); |
| /* We want to maintain the bind socket if bind was enabled */ |
| if (!(flags & OSMO_SOCK_F_BIND)) { |
| close(sfd); |
| sfd = -1; |
| } |
| continue; |
| } |
| break; |
| } |
| freeaddrinfo(result); |
| if (rp == NULL) { |
| LOGP(DLGLOBAL, LOGL_ERROR, "no suitable remote addr found for: %s:%u\n", |
| remote_host, remote_port); |
| if (sfd >= 0) |
| close(sfd); |
| return -ENODEV; |
| } |
| } |
| |
| rc = osmo_sock_init_tail(sfd, type, flags); |
| if (rc < 0) { |
| close(sfd); |
| sfd = -1; |
| } |
| |
| return sfd; |
| } |
| |
| #ifdef HAVE_LIBSCTP |
| |
| |
| /* Build array of addresses taking first addrinfo result of the requested family |
| * for each host in hosts. addrs4 or addrs6 are filled based on family type. */ |
| static int addrinfo_to_sockaddr(uint16_t family, const struct addrinfo **result, |
| const char **hosts, int host_cont, |
| struct sockaddr_in *addrs4, struct sockaddr_in6 *addrs6) { |
| size_t host_idx; |
| const struct addrinfo *rp; |
| OSMO_ASSERT(family == AF_INET || family == AF_INET6); |
| |
| for (host_idx = 0; host_idx < host_cont; host_idx++) { |
| for (rp = result[host_idx]; rp != NULL; rp = rp->ai_next) { |
| if (rp->ai_family != family) |
| continue; |
| if (family == AF_INET) |
| memcpy(&addrs4[host_idx], rp->ai_addr, sizeof(addrs4[host_idx])); |
| else |
| memcpy(&addrs6[host_idx], rp->ai_addr, sizeof(addrs6[host_idx])); |
| break; |
| } |
| if (!rp) { /* No addr could be bound for this host! */ |
| LOGP(DLGLOBAL, LOGL_ERROR, "No suitable remote address found for host: %s\n", |
| hosts[host_idx]); |
| return -ENODEV; |
| } |
| } |
| return 0; |
| } |
| |
| /*! Initialize a socket (including bind and/or connect) with multiple local or remote addresses. |
| * \param[in] family Address Family like AF_INET, AF_INET6, AF_UNSPEC |
| * \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM |
| * \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP |
| * \param[in] local_hosts array of char pointers (strings), each containing local host name or IP address in string form |
| * \param[in] local_hosts_cnt length of local_hosts (in items) |
| * \param[in] local_port local port number in host byte order |
| * \param[in] remote_host array of char pointers (strings), each containing remote host name or IP address in string form |
| * \param[in] remote_hosts_cnt length of remote_hosts (in items) |
| * \param[in] remote_port remote port number in host byte order |
| * \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT |
| * \returns socket file descriptor on success; negative on error |
| * |
| * This function is similar to \ref osmo_sock_init2(), but can be passed an |
| * array of local or remote addresses for protocols supporting multiple |
| * addresses per socket, like SCTP (currently only one supported). This function |
| * should not be used by protocols not supporting this kind of features, but |
| * rather \ref osmo_sock_init2() should be used instead. |
| * See \ref osmo_sock_init2() for more information on flags and general behavior. |
| */ |
| int osmo_sock_init2_multiaddr(uint16_t family, uint16_t type, uint8_t proto, |
| const char **local_hosts, size_t local_hosts_cnt, uint16_t local_port, |
| const char **remote_hosts, size_t remote_hosts_cnt, uint16_t remote_port, |
| unsigned int flags) |
| |
| { |
| struct addrinfo *result[OSMO_SOCK_MAX_ADDRS]; |
| int sfd = -1, rc, on = 1; |
| int i; |
| struct sockaddr_in addrs4[OSMO_SOCK_MAX_ADDRS]; |
| struct sockaddr_in6 addrs6[OSMO_SOCK_MAX_ADDRS]; |
| struct sockaddr *addrs; |
| char strbuf[512]; |
| |
| /* TODO: So far this function is only aimed for SCTP, but could be |
| reused in the future for other protocols with multi-addr support */ |
| if (proto != IPPROTO_SCTP) |
| return -ENOTSUP; |
| |
| /* TODO: Let's not support AF_UNSPEC for now. sctp_bindx() actually |
| supports binding both types of addresses on a AF_INET6 soscket, but |
| that would mean we could get both AF_INET and AF_INET6 addresses for |
| each host, and makes complexity of this function increase a lot since |
| we'd need to find out which subsets to use, use v4v6 mapped socket, |
| etc. */ |
| if (family == AF_UNSPEC) |
| return -ENOTSUP; |
| |
| if ((flags & (OSMO_SOCK_F_BIND | OSMO_SOCK_F_CONNECT)) == 0) { |
| LOGP(DLGLOBAL, LOGL_ERROR, "invalid: you have to specify either " |
| "BIND or CONNECT flags\n"); |
| return -EINVAL; |
| } |
| |
| if (((flags & OSMO_SOCK_F_BIND) && !local_hosts_cnt) || |
| ((flags & OSMO_SOCK_F_CONNECT) && !remote_hosts_cnt) || |
| local_hosts_cnt > OSMO_SOCK_MAX_ADDRS || |
| remote_hosts_cnt > OSMO_SOCK_MAX_ADDRS) |
| return -EINVAL; |
| |
| /* figure out local side of socket */ |
| if (flags & OSMO_SOCK_F_BIND) { |
| rc = addrinfo_helper_multi(result, family, type, proto, local_hosts, |
| local_hosts_cnt, local_port, true); |
| if (rc < 0) |
| return -EINVAL; |
| |
| /* Since addrinfo_helper sets ai_family, socktype and |
| ai_protocol in hints, we know all results will use same |
| values, so simply pick the first one and pass it to create |
| the socket: |
| */ |
| sfd = socket_helper(result[0], flags); |
| if (sfd < 0) { |
| for (i = 0; i < local_hosts_cnt; i++) |
| freeaddrinfo(result[i]); |
| return sfd; |
| } |
| |
| /* Since so far we only allow IPPROTO_SCTP in this function, |
| no need to check below for "proto != IPPROTO_UDP || flags & OSMO_SOCK_F_UDP_REUSEADDR" */ |
| rc = setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, |
| &on, sizeof(on)); |
| if (rc < 0) { |
| multiaddr_snprintf(strbuf, sizeof(strbuf), local_hosts, local_hosts_cnt); |
| LOGP(DLGLOBAL, LOGL_ERROR, |
| "cannot setsockopt socket:" |
| " %s:%u: %s\n", |
| strbuf, local_port, |
| strerror(errno)); |
| for (i = 0; i < local_hosts_cnt; i++) |
| freeaddrinfo(result[i]); |
| close(sfd); |
| return rc; |
| } |
| |
| /* Build array of addresses taking first of same family for each host. |
| TODO: Ideally we should use backtracking storing last used |
| indexes and trying next combination if connect() fails .*/ |
| rc = addrinfo_to_sockaddr(family, (const struct addrinfo **)result, |
| local_hosts, local_hosts_cnt, addrs4, addrs6); |
| if (rc < 0) { |
| for (i = 0; i < local_hosts_cnt; i++) |
| freeaddrinfo(result[i]); |
| close(sfd); |
| return -ENODEV; |
| } |
| |
| if (family == AF_INET) |
| addrs = (struct sockaddr *)addrs4; |
| else |
| addrs = (struct sockaddr *)addrs6; |
| if (sctp_bindx(sfd, addrs, local_hosts_cnt, SCTP_BINDX_ADD_ADDR) == -1) { |
| multiaddr_snprintf(strbuf, sizeof(strbuf), local_hosts, local_hosts_cnt); |
| LOGP(DLGLOBAL, LOGL_NOTICE, "unable to bind socket: %s:%u: %s\n", |
| strbuf, local_port, strerror(errno)); |
| for (i = 0; i < local_hosts_cnt; i++) |
| freeaddrinfo(result[i]); |
| close(sfd); |
| return -ENODEV; |
| } |
| for (i = 0; i < local_hosts_cnt; i++) |
| freeaddrinfo(result[i]); |
| } |
| |
| /* Reached this point, if OSMO_SOCK_F_BIND then sfd is valid (>=0) or it |
| was already closed and func returned. If OSMO_SOCK_F_BIND is not |
| set, then sfd = -1 */ |
| |
| /* figure out remote side of socket */ |
| if (flags & OSMO_SOCK_F_CONNECT) { |
| rc = addrinfo_helper_multi(result, family, type, proto, remote_hosts, |
| remote_hosts_cnt, remote_port, false); |
| if (rc < 0) { |
| if (sfd >= 0) |
| close(sfd); |
| return -EINVAL; |
| } |
| |
| if (sfd < 0) { |
| /* Since addrinfo_helper sets ai_family, socktype and |
| ai_protocol in hints, we know all results will use same |
| values, so simply pick the first one and pass it to create |
| the socket: |
| */ |
| sfd = socket_helper(result[0], flags); |
| if (sfd < 0) { |
| for (i = 0; i < remote_hosts_cnt; i++) |
| freeaddrinfo(result[i]); |
| return sfd; |
| } |
| } |
| |
| /* Build array of addresses taking first of same family for each host. |
| TODO: Ideally we should use backtracking storing last used |
| indexes and trying next combination if connect() fails .*/ |
| rc = addrinfo_to_sockaddr(family, (const struct addrinfo **)result, |
| remote_hosts, remote_hosts_cnt, addrs4, addrs6); |
| if (rc < 0) { |
| for (i = 0; i < remote_hosts_cnt; i++) |
| freeaddrinfo(result[i]); |
| close(sfd); |
| return -ENODEV; |
| } |
| |
| if (family == AF_INET) |
| addrs = (struct sockaddr *)addrs4; |
| else |
| addrs = (struct sockaddr *)addrs6; |
| rc = sctp_connectx(sfd, addrs, remote_hosts_cnt, NULL); |
| if (rc != 0 && errno != EINPROGRESS) { |
| multiaddr_snprintf(strbuf, sizeof(strbuf), remote_hosts, remote_hosts_cnt); |
| LOGP(DLGLOBAL, LOGL_ERROR, "unable to connect socket: %s:%u: %s\n", |
| strbuf, remote_port, strerror(errno)); |
| for (i = 0; i < remote_hosts_cnt; i++) |
| freeaddrinfo(result[i]); |
| close(sfd); |
| return -ENODEV; |
| } |
| for (i = 0; i < remote_hosts_cnt; i++) |
| freeaddrinfo(result[i]); |
| } |
| |
| rc = osmo_sock_init_tail(sfd, type, flags); |
| if (rc < 0) { |
| close(sfd); |
| sfd = -1; |
| } |
| |
| return sfd; |
| } |
| #endif /* HAVE_LIBSCTP */ |
| |
| /*! Initialize a socket (including bind/connect) |
| * \param[in] family Address Family like AF_INET, AF_INET6, AF_UNSPEC |
| * \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM |
| * \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP |
| * \param[in] host remote host name or IP address in string form |
| * \param[in] port remote port number in host byte order |
| * \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT |
| * \returns socket file descriptor on success; negative on error |
| * |
| * This function creates a new socket of the designated \a family, \a |
| * type and \a proto and optionally binds or connects it, depending on |
| * the value of \a flags parameter. |
| */ |
| int osmo_sock_init(uint16_t family, uint16_t type, uint8_t proto, |
| const char *host, uint16_t port, unsigned int flags) |
| { |
| struct addrinfo *result, *rp; |
| int sfd, rc, on = 1; |
| |
| if ((flags & (OSMO_SOCK_F_BIND | OSMO_SOCK_F_CONNECT)) == |
| (OSMO_SOCK_F_BIND | OSMO_SOCK_F_CONNECT)) { |
| LOGP(DLGLOBAL, LOGL_ERROR, "invalid: both bind and connect flags set:" |
| " %s:%u\n", host, port); |
| return -EINVAL; |
| } |
| |
| result = addrinfo_helper(family, type, proto, host, port, flags & OSMO_SOCK_F_BIND); |
| if (!result) { |
| LOGP(DLGLOBAL, LOGL_ERROR, "getaddrinfo returned NULL: %s:%u: %s\n", |
| host, port, strerror(errno)); |
| return -EINVAL; |
| } |
| |
| for (rp = result; rp != NULL; rp = rp->ai_next) { |
| sfd = socket_helper(rp, flags); |
| if (sfd == -1) |
| continue; |
| |
| if (flags & OSMO_SOCK_F_CONNECT) { |
| rc = connect(sfd, rp->ai_addr, rp->ai_addrlen); |
| if (rc != 0 && errno != EINPROGRESS) { |
| close(sfd); |
| continue; |
| } |
| } else { |
| if (proto != IPPROTO_UDP || flags & OSMO_SOCK_F_UDP_REUSEADDR) { |
| rc = setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, |
| &on, sizeof(on)); |
| if (rc < 0) { |
| LOGP(DLGLOBAL, LOGL_ERROR, |
| "cannot setsockopt socket:" |
| " %s:%u: %s\n", |
| host, port, strerror(errno)); |
| close(sfd); |
| continue; |
| } |
| } |
| if (bind(sfd, rp->ai_addr, rp->ai_addrlen) == -1) { |
| LOGP(DLGLOBAL, LOGL_ERROR, "unable to bind socket:" |
| "%s:%u: %s\n", |
| host, port, strerror(errno)); |
| close(sfd); |
| continue; |
| } |
| } |
| break; |
| } |
| freeaddrinfo(result); |
| |
| if (rp == NULL) { |
| LOGP(DLGLOBAL, LOGL_ERROR, "no suitable addr found for: %s:%u\n", |
| host, port); |
| return -ENODEV; |
| } |
| |
| if (proto != IPPROTO_UDP || flags & OSMO_SOCK_F_UDP_REUSEADDR) { |
| rc = setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
| if (rc < 0) { |
| LOGP(DLGLOBAL, LOGL_ERROR, |
| "cannot setsockopt socket: %s:%u: %s\n", host, |
| port, strerror(errno)); |
| close(sfd); |
| sfd = -1; |
| } |
| } |
| |
| rc = osmo_sock_init_tail(sfd, type, flags); |
| if (rc < 0) { |
| close(sfd); |
| sfd = -1; |
| } |
| |
| return sfd; |
| } |
| |
| /*! fill \ref osmo_fd for a give sfd |
| * \param[out] ofd file descriptor (will be filled in) |
| * \param[in] sfd socket file descriptor |
| * \returns socket fd on success; negative on error |
| * |
| * This function fills the \a ofd structure. |
| */ |
| static inline int osmo_fd_init_ofd(struct osmo_fd *ofd, int sfd) |
| { |
| int rc; |
| |
| if (sfd < 0) |
| return sfd; |
| |
| ofd->fd = sfd; |
| ofd->when = OSMO_FD_READ; |
| |
| rc = osmo_fd_register(ofd); |
| if (rc < 0) { |
| close(sfd); |
| return rc; |
| } |
| |
| return sfd; |
| } |
| |
| /*! Initialize a socket and fill \ref osmo_fd |
| * \param[out] ofd file descriptor (will be filled in) |
| * \param[in] family Address Family like AF_INET, AF_INET6, AF_UNSPEC |
| * \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM |
| * \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP |
| * \param[in] host remote host name or IP address in string form |
| * \param[in] port remote port number in host byte order |
| * \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT |
| * \returns socket fd on success; negative on error |
| * |
| * This function creates (and optionall binds/connects) a socket using |
| * \ref osmo_sock_init, but also fills the \a ofd structure. |
| */ |
| int osmo_sock_init_ofd(struct osmo_fd *ofd, int family, int type, int proto, |
| const char *host, uint16_t port, unsigned int flags) |
| { |
| return osmo_fd_init_ofd(ofd, osmo_sock_init(family, type, proto, host, port, flags)); |
| } |
| |
| /*! Initialize a socket and fill \ref osmo_fd |
| * \param[out] ofd file descriptor (will be filled in) |
| * \param[in] family Address Family like AF_INET, AF_INET6, AF_UNSPEC |
| * \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM |
| * \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP |
| * \param[in] local_host local host name or IP address in string form |
| * \param[in] local_port local port number in host byte order |
| * \param[in] remote_host remote host name or IP address in string form |
| * \param[in] remote_port remote port number in host byte order |
| * \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT |
| * \returns socket fd on success; negative on error |
| * |
| * This function creates (and optionall binds/connects) a socket using |
| * \ref osmo_sock_init2, but also fills the \a ofd structure. |
| */ |
| int osmo_sock_init2_ofd(struct osmo_fd *ofd, int family, int type, int proto, |
| const char *local_host, uint16_t local_port, |
| const char *remote_host, uint16_t remote_port, unsigned int flags) |
| { |
| return osmo_fd_init_ofd(ofd, osmo_sock_init2(family, type, proto, local_host, |
| local_port, remote_host, remote_port, flags)); |
| } |
| |
| /*! Initialize a socket and fill \ref sockaddr |
| * \param[out] ss socket address (will be filled in) |
| * \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM |
| * \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP |
| * \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT |
| * \returns socket fd on success; negative on error |
| * |
| * This function creates (and optionall binds/connects) a socket using |
| * \ref osmo_sock_init, but also fills the \a ss structure. |
| */ |
| int osmo_sock_init_sa(struct sockaddr *ss, uint16_t type, |
| uint8_t proto, unsigned int flags) |
| { |
| char host[NI_MAXHOST]; |
| uint16_t port; |
| struct sockaddr_in *sin; |
| struct sockaddr_in6 *sin6; |
| int s, sa_len; |
| |
| /* determine port and host from ss */ |
| switch (ss->sa_family) { |
| case AF_INET: |
| sin = (struct sockaddr_in *) ss; |
| sa_len = sizeof(struct sockaddr_in); |
| port = ntohs(sin->sin_port); |
| break; |
| case AF_INET6: |
| sin6 = (struct sockaddr_in6 *) ss; |
| sa_len = sizeof(struct sockaddr_in6); |
| port = ntohs(sin6->sin6_port); |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| s = getnameinfo(ss, sa_len, host, NI_MAXHOST, |
| NULL, 0, NI_NUMERICHOST); |
| if (s != 0) { |
| LOGP(DLGLOBAL, LOGL_ERROR, "getnameinfo failed:" |
| " %s\n", strerror(errno)); |
| return s; |
| } |
| |
| return osmo_sock_init(ss->sa_family, type, proto, host, port, flags); |
| } |
| |
| static int sockaddr_equal(const struct sockaddr *a, |
| const struct sockaddr *b, unsigned int len) |
| { |
| struct sockaddr_in *sin_a, *sin_b; |
| struct sockaddr_in6 *sin6_a, *sin6_b; |
| |
| if (a->sa_family != b->sa_family) |
| return 0; |
| |
| switch (a->sa_family) { |
| case AF_INET: |
| sin_a = (struct sockaddr_in *)a; |
| sin_b = (struct sockaddr_in *)b; |
| if (!memcmp(&sin_a->sin_addr, &sin_b->sin_addr, |
| sizeof(struct in_addr))) |
| return 1; |
| break; |
| case AF_INET6: |
| sin6_a = (struct sockaddr_in6 *)a; |
| sin6_b = (struct sockaddr_in6 *)b; |
| if (!memcmp(&sin6_a->sin6_addr, &sin6_b->sin6_addr, |
| sizeof(struct in6_addr))) |
| return 1; |
| break; |
| } |
| return 0; |
| } |
| |
| /*! Determine if the given address is a local address |
| * \param[in] addr Socket Address |
| * \param[in] addrlen Length of socket address in bytes |
| * \returns 1 if address is local, 0 otherwise. |
| */ |
| int osmo_sockaddr_is_local(struct sockaddr *addr, unsigned int addrlen) |
| { |
| struct ifaddrs *ifaddr, *ifa; |
| |
| if (getifaddrs(&ifaddr) == -1) { |
| LOGP(DLGLOBAL, LOGL_ERROR, "getifaddrs:" |
| " %s\n", strerror(errno)); |
| return -EIO; |
| } |
| |
| for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) { |
| if (!ifa->ifa_addr) |
| continue; |
| if (sockaddr_equal(ifa->ifa_addr, addr, addrlen)) { |
| freeifaddrs(ifaddr); |
| return 1; |
| } |
| } |
| |
| freeifaddrs(ifaddr); |
| return 0; |
| } |
| |
| /*! Convert sockaddr_in to IP address as char string and port as uint16_t. |
| * \param[out] addr String buffer to write IP address to, or NULL. |
| * \param[out] addr_len Size of \a addr. |
| * \param[out] port Pointer to uint16_t to write the port number to, or NULL. |
| * \param[in] sin Sockaddr to convert. |
| * \returns the required string buffer size, like osmo_strlcpy(), or 0 if \a addr is NULL. |
| */ |
| size_t osmo_sockaddr_in_to_str_and_uint(char *addr, unsigned int addr_len, uint16_t *port, |
| const struct sockaddr_in *sin) |
| { |
| if (port) |
| *port = ntohs(sin->sin_port); |
| |
| if (addr) |
| return osmo_strlcpy(addr, inet_ntoa(sin->sin_addr), addr_len); |
| |
| return 0; |
| } |
| |
| /*! Convert sockaddr to IP address as char string and port as uint16_t. |
| * \param[out] addr String buffer to write IP address to, or NULL. |
| * \param[out] addr_len Size of \a addr. |
| * \param[out] port Pointer to uint16_t to write the port number to, or NULL. |
| * \param[in] sa Sockaddr to convert. |
| * \returns the required string buffer size, like osmo_strlcpy(), or 0 if \a addr is NULL. |
| */ |
| unsigned int osmo_sockaddr_to_str_and_uint(char *addr, unsigned int addr_len, uint16_t *port, |
| const struct sockaddr *sa) |
| { |
| const struct sockaddr_in *sin = (const struct sockaddr_in *)sa; |
| |
| return osmo_sockaddr_in_to_str_and_uint(addr, addr_len, port, sin); |
| } |
| |
| /*! Initialize a unix domain socket (including bind/connect) |
| * \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM |
| * \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP |
| * \param[in] socket_path path to identify the socket |
| * \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT |
| * \returns socket fd on success; negative on error |
| * |
| * This function creates a new unix domain socket, \a |
| * type and \a proto and optionally binds or connects it, depending on |
| * the value of \a flags parameter. |
| */ |
| #if defined(__clang__) && defined(SUN_LEN) |
| __attribute__((no_sanitize("undefined"))) |
| #endif |
| int osmo_sock_unix_init(uint16_t type, uint8_t proto, |
| const char *socket_path, unsigned int flags) |
| { |
| struct sockaddr_un local; |
| int sfd, rc, on = 1; |
| unsigned int namelen; |
| |
| if ((flags & (OSMO_SOCK_F_BIND | OSMO_SOCK_F_CONNECT)) == |
| (OSMO_SOCK_F_BIND | OSMO_SOCK_F_CONNECT)) |
| return -EINVAL; |
| |
| local.sun_family = AF_UNIX; |
| /* When an AF_UNIX socket is bound, sun_path should be NUL-terminated. See unix(7) man page. */ |
| if (osmo_strlcpy(local.sun_path, socket_path, sizeof(local.sun_path)) >= sizeof(local.sun_path)) { |
| LOGP(DLGLOBAL, LOGL_ERROR, "Socket path exceeds maximum length of %zd bytes: %s\n", |
| sizeof(local.sun_path), socket_path); |
| return -ENOSPC; |
| } |
| |
| #if defined(BSD44SOCKETS) || defined(__UNIXWARE__) |
| local.sun_len = strlen(local.sun_path); |
| #endif |
| #if defined(BSD44SOCKETS) || defined(SUN_LEN) |
| namelen = SUN_LEN(&local); |
| #else |
| namelen = strlen(local.sun_path) + |
| offsetof(struct sockaddr_un, sun_path); |
| #endif |
| |
| sfd = socket(AF_UNIX, type, proto); |
| if (sfd < 0) |
| return -1; |
| |
| if (flags & OSMO_SOCK_F_CONNECT) { |
| rc = connect(sfd, (struct sockaddr *)&local, namelen); |
| if (rc < 0) |
| goto err; |
| } else { |
| unlink(local.sun_path); |
| rc = bind(sfd, (struct sockaddr *)&local, namelen); |
| if (rc < 0) |
| goto err; |
| } |
| |
| if (flags & OSMO_SOCK_F_NONBLOCK) { |
| if (ioctl(sfd, FIONBIO, (unsigned char *)&on) < 0) { |
| LOGP(DLGLOBAL, LOGL_ERROR, |
| "cannot set this socket unblocking: %s\n", |
| strerror(errno)); |
| close(sfd); |
| return -EINVAL; |
| } |
| } |
| |
| rc = osmo_sock_init_tail(sfd, type, flags); |
| if (rc < 0) { |
| close(sfd); |
| sfd = -1; |
| } |
| |
| return sfd; |
| err: |
| close(sfd); |
| return -1; |
| } |
| |
| /*! Initialize a unix domain socket and fill \ref osmo_fd |
| * \param[out] ofd file descriptor (will be filled in) |
| * \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM |
| * \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP |
| * \param[in] socket_path path to identify the socket |
| * \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT |
| * \returns socket fd on success; negative on error |
| * |
| * This function creates (and optionally binds/connects) a socket |
| * using osmo_sock_unix_init, but also fills the ofd structure. |
| */ |
| int osmo_sock_unix_init_ofd(struct osmo_fd *ofd, uint16_t type, uint8_t proto, |
| const char *socket_path, unsigned int flags) |
| { |
| return osmo_fd_init_ofd(ofd, osmo_sock_unix_init(type, proto, socket_path, flags)); |
| } |
| |
| /*! Get the IP and/or port number on socket in separate string buffers. |
| * \param[in] fd file descriptor of socket |
| * \param[out] ip IP address (will be filled in when not NULL) |
| * \param[in] ip_len length of the ip buffer |
| * \param[out] port number (will be filled in when not NULL) |
| * \param[in] port_len length of the port buffer |
| * \param[in] local (true) or remote (false) name will get looked at |
| * \returns 0 on success; negative otherwise |
| */ |
| int osmo_sock_get_ip_and_port(int fd, char *ip, size_t ip_len, char *port, size_t port_len, bool local) |
| { |
| struct sockaddr sa; |
| socklen_t len = sizeof(sa); |
| char ipbuf[INET6_ADDRSTRLEN], portbuf[6]; |
| int rc; |
| |
| rc = local ? getsockname(fd, &sa, &len) : getpeername(fd, &sa, &len); |
| if (rc < 0) |
| return rc; |
| |
| rc = getnameinfo(&sa, len, ipbuf, sizeof(ipbuf), |
| portbuf, sizeof(portbuf), |
| NI_NUMERICHOST | NI_NUMERICSERV); |
| if (rc < 0) |
| return rc; |
| |
| if (ip) |
| strncpy(ip, ipbuf, ip_len); |
| if (port) |
| strncpy(port, portbuf, port_len); |
| return 0; |
| } |
| |
| /*! Get local IP address on socket |
| * \param[in] fd file descriptor of socket |
| * \param[out] ip IP address (will be filled in) |
| * \param[in] len length of the output buffer |
| * \returns 0 on success; negative otherwise |
| */ |
| int osmo_sock_get_local_ip(int fd, char *ip, size_t len) |
| { |
| return osmo_sock_get_ip_and_port(fd, ip, len, NULL, 0, true); |
| } |
| |
| /*! Get local port on socket |
| * \param[in] fd file descriptor of socket |
| * \param[out] port number (will be filled in) |
| * \param[in] len length of the output buffer |
| * \returns 0 on success; negative otherwise |
| */ |
| int osmo_sock_get_local_ip_port(int fd, char *port, size_t len) |
| { |
| return osmo_sock_get_ip_and_port(fd, NULL, 0, port, len, true); |
| } |
| |
| /*! Get remote IP address on socket |
| * \param[in] fd file descriptor of socket |
| * \param[out] ip IP address (will be filled in) |
| * \param[in] len length of the output buffer |
| * \returns 0 on success; negative otherwise |
| */ |
| int osmo_sock_get_remote_ip(int fd, char *ip, size_t len) |
| { |
| return osmo_sock_get_ip_and_port(fd, ip, len, NULL, 0, false); |
| } |
| |
| /*! Get remote port on socket |
| * \param[in] fd file descriptor of socket |
| * \param[out] port number (will be filled in) |
| * \param[in] len length of the output buffer |
| * \returns 0 on success; negative otherwise |
| */ |
| int osmo_sock_get_remote_ip_port(int fd, char *port, size_t len) |
| { |
| return osmo_sock_get_ip_and_port(fd, NULL, 0, port, len, false); |
| } |
| |
| /*! Get address/port information on socket in dyn-alloc string like "(r=1.2.3.4:5<->l=6.7.8.9:10)". |
| * Usually, it is better to use osmo_sock_get_name2() for a static string buffer or osmo_sock_get_name_buf() for a |
| * caller provided string buffer, to avoid the dynamic talloc allocation. |
| * \param[in] ctx talloc context from which to allocate string buffer |
| * \param[in] fd file descriptor of socket |
| * \returns string identifying the connection of this socket, talloc'd from ctx. |
| */ |
| char *osmo_sock_get_name(const void *ctx, int fd) |
| { |
| char str[OSMO_SOCK_NAME_MAXLEN]; |
| int rc; |
| rc = osmo_sock_get_name_buf(str, sizeof(str), fd); |
| if (rc <= 0) |
| return NULL; |
| return talloc_asprintf(ctx, "(%s)", str); |
| } |
| |
| /*! Get address/port information on socket in provided string buffer, like "r=1.2.3.4:5<->l=6.7.8.9:10". |
| * This does not include braces like osmo_sock_get_name(). |
| * \param[out] str Destination string buffer. |
| * \param[in] str_len sizeof(str). |
| * \param[in] fd File descriptor of socket. |
| * \return String length as returned by snprintf(), or negative on error. |
| */ |
| int osmo_sock_get_name_buf(char *str, size_t str_len, int fd) |
| { |
| char hostbuf_l[INET6_ADDRSTRLEN], hostbuf_r[INET6_ADDRSTRLEN]; |
| char portbuf_l[6], portbuf_r[6]; |
| int rc; |
| |
| /* get local */ |
| if ((rc = osmo_sock_get_ip_and_port(fd, hostbuf_l, sizeof(hostbuf_l), portbuf_l, sizeof(portbuf_l), true))) { |
| osmo_strlcpy(str, "<error-in-getsockname>", str_len); |
| return rc; |
| } |
| |
| /* get remote */ |
| if (osmo_sock_get_ip_and_port(fd, hostbuf_r, sizeof(hostbuf_r), portbuf_r, sizeof(portbuf_r), false) != 0) |
| return snprintf(str, str_len, "r=NULL<->l=%s:%s", hostbuf_l, portbuf_l); |
| |
| return snprintf(str, str_len, "r=%s:%s<->l=%s:%s", hostbuf_r, portbuf_r, hostbuf_l, portbuf_l); |
| } |
| |
| /*! Get address/port information on socket in static string, like "r=1.2.3.4:5<->l=6.7.8.9:10". |
| * This does not include braces like osmo_sock_get_name(). |
| * \param[in] fd File descriptor of socket. |
| * \return Static string buffer containing the result. |
| */ |
| const char *osmo_sock_get_name2(int fd) |
| { |
| static __thread char str[OSMO_SOCK_NAME_MAXLEN]; |
| osmo_sock_get_name_buf(str, sizeof(str), fd); |
| return str; |
| } |
| |
| /*! Get address/port information on socket in static string, like "r=1.2.3.4:5<->l=6.7.8.9:10". |
| * This does not include braces like osmo_sock_get_name(). |
| * \param[in] fd File descriptor of socket. |
| * \return Static string buffer containing the result. |
| */ |
| char *osmo_sock_get_name2_c(const void *ctx, int fd) |
| { |
| char *str = talloc_size(ctx, OSMO_SOCK_NAME_MAXLEN); |
| if (!str) |
| return NULL; |
| osmo_sock_get_name_buf(str, OSMO_SOCK_NAME_MAXLEN, fd); |
| return str; |
| } |
| |
| static int sock_get_domain(int fd) |
| { |
| int domain; |
| #ifdef SO_DOMAIN |
| socklen_t dom_len = sizeof(domain); |
| int rc; |
| |
| rc = getsockopt(fd, SOL_SOCKET, SO_DOMAIN, &domain, &dom_len); |
| if (rc < 0) |
| return rc; |
| #else |
| /* This of course sucks, but what shall we do on OSs like |
| * FreeBSD that don't seem to expose a method by which one can |
| * learn the address family of a socket? */ |
| domain = AF_INET; |
| #endif |
| return domain; |
| } |
| |
| |
| /*! Activate or de-activate local loop-back of transmitted multicast packets |
| * \param[in] fd file descriptor of related socket |
| * \param[in] enable Enable (true) or disable (false) loop-back |
| * \returns 0 on success; negative otherwise */ |
| int osmo_sock_mcast_loop_set(int fd, bool enable) |
| { |
| int domain, loop = 0; |
| |
| if (enable) |
| loop = 1; |
| |
| domain = sock_get_domain(fd); |
| if (domain < 0) |
| return domain; |
| |
| switch (domain) { |
| case AF_INET: |
| return setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)); |
| case AF_INET6: |
| return setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &loop, sizeof(loop)); |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| /*! Set the TTL of outbound multicast packets |
| * \param[in] fd file descriptor of related socket |
| * \param[in] ttl TTL of to-be-sent multicast packets |
| * \returns 0 on success; negative otherwise */ |
| int osmo_sock_mcast_ttl_set(int fd, uint8_t ttl) |
| { |
| int domain, ttli = ttl; |
| |
| domain = sock_get_domain(fd); |
| if (domain < 0) |
| return domain; |
| |
| switch (domain) { |
| case AF_INET: |
| return setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttli, sizeof(ttli)); |
| case AF_INET6: |
| return setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttli, sizeof(ttli)); |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| /*! Set the network device to which we should bind the multicast socket |
| * \param[in] fd file descriptor of related socket |
| * \param[in] ifname name of network interface to user for multicast |
| * \returns 0 on success; negative otherwise */ |
| int osmo_sock_mcast_iface_set(int fd, const char *ifname) |
| { |
| unsigned int ifindex; |
| struct ip_mreqn mr; |
| |
| /* first, resolve interface name to ifindex */ |
| ifindex = if_nametoindex(ifname); |
| if (ifindex == 0) |
| return -errno; |
| |
| /* next, configure kernel to use that ifindex for this sockets multicast traffic */ |
| memset(&mr, 0, sizeof(mr)); |
| mr.imr_ifindex = ifindex; |
| return setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF, &mr, sizeof(mr)); |
| } |
| |
| |
| /*! Enable/disable receiving all multicast packets, even for non-subscribed groups |
| * \param[in] fd file descriptor of related socket |
| * \param[in] enable Enable or Disable receiving of all packets |
| * \returns 0 on success; negative otherwise */ |
| int osmo_sock_mcast_all_set(int fd, bool enable) |
| { |
| int domain, all = 0; |
| |
| if (enable) |
| all = 1; |
| |
| domain = sock_get_domain(fd); |
| if (domain < 0) |
| return domain; |
| |
| switch (domain) { |
| case AF_INET: |
| #ifdef IP_MULTICAST_ALL |
| return setsockopt(fd, IPPROTO_IP, IP_MULTICAST_ALL, &all, sizeof(all)); |
| #endif |
| case AF_INET6: |
| /* there seems no equivalent ?!? */ |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| /* FreeBSD calls the socket option differently */ |
| #if !defined(IPV6_ADD_MEMBERSHIP) && defined(IPV6_JOIN_GROUP) |
| #define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP |
| #endif |
| |
| /*! Subscribe to the given IP multicast group |
| * \param[in] fd file descriptor of related scoket |
| * \param[in] grp_addr ASCII representation of the multicast group address |
| * \returns 0 on success; negative otherwise */ |
| int osmo_sock_mcast_subscribe(int fd, const char *grp_addr) |
| { |
| int rc, domain; |
| struct ip_mreq mreq; |
| struct ipv6_mreq mreq6; |
| struct in6_addr i6a; |
| |
| domain = sock_get_domain(fd); |
| if (domain < 0) |
| return domain; |
| |
| switch (domain) { |
| case AF_INET: |
| memset(&mreq, 0, sizeof(mreq)); |
| mreq.imr_multiaddr.s_addr = inet_addr(grp_addr); |
| mreq.imr_interface.s_addr = htonl(INADDR_ANY); |
| return setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)); |
| #ifdef IPV6_ADD_MEMBERSHIP |
| case AF_INET6: |
| memset(&mreq6, 0, sizeof(mreq6)); |
| rc = inet_pton(AF_INET6, grp_addr, (void *)&i6a); |
| if (rc < 0) |
| return -EINVAL; |
| mreq6.ipv6mr_multiaddr = i6a; |
| return setsockopt(fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)); |
| #endif |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| /*! Determine the matching local IP-address for a given remote IP-Address. |
| * \param[out] local_ip caller provided memory for resulting local IP-address |
| * \param[in] remote_ip remote IP-address |
| * \param[in] fd file descriptor of related scoket |
| * \returns 0 on success; negative otherwise |
| * |
| * The function accepts IPv4 and IPv6 address strings. The caller must provide |
| * at least INET6_ADDRSTRLEN bytes for local_ip if an IPv6 is expected as |
| * as result. For IPv4 addresses the required amount is INET_ADDRSTRLEN. */ |
| int osmo_sock_local_ip(char *local_ip, const char *remote_ip) |
| { |
| int sfd; |
| int rc; |
| struct addrinfo addrinfo_hint; |
| struct addrinfo *addrinfo = NULL; |
| struct sockaddr_in local_addr; |
| socklen_t local_addr_len; |
| uint16_t family; |
| |
| /* Find out the address family (AF_INET or AF_INET6?) */ |
| memset(&addrinfo_hint, '\0', sizeof(addrinfo_hint)); |
| addrinfo_hint.ai_family = PF_UNSPEC; |
| addrinfo_hint.ai_flags = AI_NUMERICHOST; |
| rc = getaddrinfo(remote_ip, NULL, &addrinfo_hint, &addrinfo); |
| if (rc) |
| return -EINVAL; |
| family = addrinfo->ai_family; |
| freeaddrinfo(addrinfo); |
| |
| /* Connect a dummy socket to trick the kernel into determining the |
| * ip-address of the interface that would be used if we would send |
| * out an actual packet */ |
| sfd = osmo_sock_init2(family, SOCK_DGRAM, IPPROTO_UDP, NULL, 0, remote_ip, 0, OSMO_SOCK_F_CONNECT); |
| if (sfd < 0) |
| return -EINVAL; |
| |
| /* Request the IP address of the interface that the kernel has |
| * actually choosen. */ |
| memset(&local_addr, 0, sizeof(local_addr)); |
| local_addr_len = sizeof(local_addr); |
| rc = getsockname(sfd, (struct sockaddr *)&local_addr, &local_addr_len); |
| close(sfd); |
| if (rc < 0) |
| return -EINVAL; |
| if (local_addr.sin_family == AF_INET) |
| inet_ntop(AF_INET, &local_addr.sin_addr, local_ip, INET_ADDRSTRLEN); |
| else if (local_addr.sin_family == AF_INET6) |
| inet_ntop(AF_INET6, &local_addr.sin_addr, local_ip, INET6_ADDRSTRLEN); |
| else |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| #endif /* HAVE_SYS_SOCKET_H */ |
| |
| /*! @} */ |