Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 1 | #include "../config.h" |
| 2 | |
Harald Welte | ba6988b | 2011-08-17 12:46:48 +0200 | [diff] [blame] | 3 | /*! \addtogroup socket |
| 4 | * @{ |
| 5 | */ |
| 6 | |
| 7 | /*! \file socket.c |
| 8 | * \brief Osmocom socket convenience functions |
| 9 | */ |
| 10 | |
Harald Welte | e476442 | 2011-05-22 12:25:57 +0200 | [diff] [blame] | 11 | #ifdef HAVE_SYS_SOCKET_H |
| 12 | |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 13 | #include <osmocom/core/logging.h> |
| 14 | #include <osmocom/core/select.h> |
| 15 | #include <osmocom/core/socket.h> |
| 16 | |
Pablo Neira Ayuso | 0849c9a | 2011-06-09 15:04:30 +0200 | [diff] [blame] | 17 | #include <sys/ioctl.h> |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 18 | #include <sys/socket.h> |
| 19 | #include <sys/types.h> |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 20 | |
| 21 | #include <stdio.h> |
| 22 | #include <unistd.h> |
| 23 | #include <stdint.h> |
| 24 | #include <string.h> |
| 25 | #include <errno.h> |
| 26 | #include <netdb.h> |
| 27 | #include <ifaddrs.h> |
| 28 | |
Harald Welte | ba6988b | 2011-08-17 12:46:48 +0200 | [diff] [blame] | 29 | /*! \brief Initialize a socket (including bind/connect) |
| 30 | * \param[in] family Address Family like AF_INET, AF_INET6, AF_UNSPEC |
| 31 | * \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM |
| 32 | * \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP |
| 33 | * \param[in] host remote host name or IP address in string form |
| 34 | * \param[in] port remote port number in host byte order |
| 35 | * \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT |
| 36 | * |
| 37 | * This function creates a new socket of the designated \a family, \a |
| 38 | * type and \a proto and optionally binds or connects it, depending on |
| 39 | * the value of \a flags parameter. |
| 40 | */ |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 41 | 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] | 42 | const char *host, uint16_t port, unsigned int flags) |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 43 | { |
| 44 | struct addrinfo hints, *result, *rp; |
Harald Welte | 68b1574 | 2011-05-22 21:47:29 +0200 | [diff] [blame] | 45 | int sfd, rc, on = 1; |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 46 | char portbuf[16]; |
| 47 | |
Pablo Neira Ayuso | 0849c9a | 2011-06-09 15:04:30 +0200 | [diff] [blame] | 48 | if ((flags & (OSMO_SOCK_F_BIND | OSMO_SOCK_F_CONNECT)) == |
| 49 | (OSMO_SOCK_F_BIND | OSMO_SOCK_F_CONNECT)) |
| 50 | return -EINVAL; |
| 51 | |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 52 | sprintf(portbuf, "%u", port); |
| 53 | memset(&hints, 0, sizeof(struct addrinfo)); |
| 54 | hints.ai_family = family; |
| 55 | hints.ai_socktype = type; |
| 56 | hints.ai_flags = 0; |
| 57 | hints.ai_protocol = proto; |
| 58 | |
Pablo Neira Ayuso | 0849c9a | 2011-06-09 15:04:30 +0200 | [diff] [blame] | 59 | if (flags & OSMO_SOCK_F_BIND) |
Harald Welte | f9e0746 | 2011-05-31 17:47:54 +0200 | [diff] [blame] | 60 | hints.ai_flags |= AI_PASSIVE; |
| 61 | |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 62 | rc = getaddrinfo(host, portbuf, &hints, &result); |
| 63 | if (rc != 0) { |
| 64 | perror("getaddrinfo returned NULL"); |
| 65 | return -EINVAL; |
| 66 | } |
| 67 | |
| 68 | for (rp = result; rp != NULL; rp = rp->ai_next) { |
| 69 | sfd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol); |
| 70 | if (sfd == -1) |
| 71 | continue; |
Pablo Neira Ayuso | 0849c9a | 2011-06-09 15:04:30 +0200 | [diff] [blame] | 72 | if (flags & OSMO_SOCK_F_NONBLOCK) { |
| 73 | if (ioctl(sfd, FIONBIO, (unsigned char *)&on) < 0) { |
| 74 | perror("cannot set this socket unblocking"); |
| 75 | close(sfd); |
| 76 | return -EINVAL; |
| 77 | } |
| 78 | } |
| 79 | if (flags & OSMO_SOCK_F_CONNECT) { |
| 80 | rc = connect(sfd, rp->ai_addr, rp->ai_addrlen); |
| 81 | if (rc != -1 || (rc == -1 && errno == EINPROGRESS)) |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 82 | break; |
| 83 | } else { |
Pablo Neira Ayuso | 0849c9a | 2011-06-09 15:04:30 +0200 | [diff] [blame] | 84 | rc = setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, |
| 85 | &on, sizeof(on)); |
| 86 | if (rc < 0) { |
| 87 | perror("cannot setsockopt socket"); |
| 88 | break; |
| 89 | } |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 90 | if (bind(sfd, rp->ai_addr, rp->ai_addrlen) != -1) |
| 91 | break; |
| 92 | } |
| 93 | close(sfd); |
| 94 | } |
| 95 | freeaddrinfo(result); |
| 96 | |
| 97 | if (rp == NULL) { |
| 98 | perror("unable to connect/bind socket"); |
| 99 | return -ENODEV; |
| 100 | } |
Harald Welte | 68b1574 | 2011-05-22 21:47:29 +0200 | [diff] [blame] | 101 | |
| 102 | setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
| 103 | |
| 104 | /* Make sure to call 'listen' on a bound, connection-oriented sock */ |
Pablo Neira Ayuso | 0849c9a | 2011-06-09 15:04:30 +0200 | [diff] [blame] | 105 | if (flags & OSMO_SOCK_F_BIND) { |
Harald Welte | 68b1574 | 2011-05-22 21:47:29 +0200 | [diff] [blame] | 106 | switch (type) { |
| 107 | case SOCK_STREAM: |
| 108 | case SOCK_SEQPACKET: |
| 109 | listen(sfd, 10); |
| 110 | break; |
| 111 | } |
| 112 | } |
| 113 | return sfd; |
| 114 | } |
| 115 | |
Harald Welte | ba6988b | 2011-08-17 12:46:48 +0200 | [diff] [blame] | 116 | /*! \brief Initialize a socket and fill \ref osmo_fd |
| 117 | * \param[out] osmocom file descriptor (will be filled in) |
| 118 | * \param[in] family Address Family like AF_INET, AF_INET6, AF_UNSPEC |
| 119 | * \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM |
| 120 | * \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP |
| 121 | * \param[in] host remote host name or IP address in string form |
| 122 | * \param[in] port remote port number in host byte order |
| 123 | * \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT |
| 124 | * |
| 125 | * This function creates (and optionall binds/connects) a socket using |
| 126 | * \ref osmo_sock_init, but also fills the \a ofd structure. |
| 127 | */ |
Harald Welte | 68b1574 | 2011-05-22 21:47:29 +0200 | [diff] [blame] | 128 | 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] | 129 | const char *host, uint16_t port, unsigned int flags) |
Harald Welte | 68b1574 | 2011-05-22 21:47:29 +0200 | [diff] [blame] | 130 | { |
| 131 | int sfd, rc; |
| 132 | |
Pablo Neira Ayuso | 0849c9a | 2011-06-09 15:04:30 +0200 | [diff] [blame] | 133 | sfd = osmo_sock_init(family, type, proto, host, port, flags); |
Harald Welte | 68b1574 | 2011-05-22 21:47:29 +0200 | [diff] [blame] | 134 | if (sfd < 0) |
| 135 | return sfd; |
| 136 | |
| 137 | ofd->fd = sfd; |
| 138 | ofd->when = BSC_FD_READ; |
| 139 | |
| 140 | rc = osmo_fd_register(ofd); |
| 141 | if (rc < 0) { |
| 142 | close(sfd); |
| 143 | return rc; |
| 144 | } |
| 145 | |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 146 | return sfd; |
| 147 | } |
| 148 | |
Harald Welte | ba6988b | 2011-08-17 12:46:48 +0200 | [diff] [blame] | 149 | /*! \brief Initialize a socket and fill \ref sockaddr |
| 150 | * \param[out] ss socket address (will be filled in) |
| 151 | * \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM |
| 152 | * \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP |
| 153 | * \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT |
| 154 | * |
| 155 | * This function creates (and optionall binds/connects) a socket using |
| 156 | * \ref osmo_sock_init, but also fills the \a ss structure. |
| 157 | */ |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 158 | int osmo_sock_init_sa(struct sockaddr *ss, uint16_t type, |
Pablo Neira Ayuso | 0849c9a | 2011-06-09 15:04:30 +0200 | [diff] [blame] | 159 | uint8_t proto, unsigned int flags) |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 160 | { |
| 161 | char host[NI_MAXHOST]; |
| 162 | uint16_t port; |
| 163 | struct sockaddr_in *sin; |
| 164 | struct sockaddr_in6 *sin6; |
| 165 | int s, sa_len; |
| 166 | |
| 167 | /* determine port and host from ss */ |
| 168 | switch (ss->sa_family) { |
| 169 | case AF_INET: |
| 170 | sin = (struct sockaddr_in *) ss; |
| 171 | sa_len = sizeof(struct sockaddr_in); |
| 172 | port = ntohs(sin->sin_port); |
| 173 | break; |
| 174 | case AF_INET6: |
| 175 | sin6 = (struct sockaddr_in6 *) ss; |
| 176 | sa_len = sizeof(struct sockaddr_in6); |
| 177 | port = ntohs(sin6->sin6_port); |
| 178 | break; |
| 179 | default: |
| 180 | return -EINVAL; |
| 181 | } |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 182 | |
| 183 | s = getnameinfo(ss, sa_len, host, NI_MAXHOST, |
| 184 | NULL, 0, NI_NUMERICHOST); |
| 185 | if (s != 0) { |
| 186 | perror("getnameinfo failed"); |
| 187 | return s; |
| 188 | } |
| 189 | |
Pablo Neira Ayuso | 0849c9a | 2011-06-09 15:04:30 +0200 | [diff] [blame] | 190 | return osmo_sock_init(ss->sa_family, type, proto, host, port, flags); |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 191 | } |
| 192 | |
| 193 | static int sockaddr_equal(const struct sockaddr *a, |
Harald Welte | e476442 | 2011-05-22 12:25:57 +0200 | [diff] [blame] | 194 | const struct sockaddr *b, unsigned int len) |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 195 | { |
| 196 | struct sockaddr_in *sin_a, *sin_b; |
| 197 | struct sockaddr_in6 *sin6_a, *sin6_b; |
| 198 | |
| 199 | if (a->sa_family != b->sa_family) |
| 200 | return 0; |
| 201 | |
| 202 | switch (a->sa_family) { |
| 203 | case AF_INET: |
| 204 | sin_a = (struct sockaddr_in *)a; |
| 205 | sin_b = (struct sockaddr_in *)b; |
| 206 | if (!memcmp(&sin_a->sin_addr, &sin_b->sin_addr, |
| 207 | sizeof(struct in_addr))) |
| 208 | return 1; |
| 209 | break; |
| 210 | case AF_INET6: |
| 211 | sin6_a = (struct sockaddr_in6 *)a; |
| 212 | sin6_b = (struct sockaddr_in6 *)b; |
| 213 | if (!memcmp(&sin6_a->sin6_addr, &sin6_b->sin6_addr, |
| 214 | sizeof(struct in6_addr))) |
| 215 | return 1; |
| 216 | break; |
| 217 | } |
| 218 | return 0; |
| 219 | } |
| 220 | |
Harald Welte | ba6988b | 2011-08-17 12:46:48 +0200 | [diff] [blame] | 221 | /*! \brief Determine if the given address is a local address |
| 222 | * \param[in] addr Socket Address |
| 223 | * \param[in] addrlen Length of socket address in bytes |
| 224 | * \returns 1 if address is local, 0 otherwise. |
| 225 | */ |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 226 | int osmo_sockaddr_is_local(struct sockaddr *addr, socklen_t addrlen) |
| 227 | { |
| 228 | struct ifaddrs *ifaddr, *ifa; |
| 229 | |
| 230 | if (getifaddrs(&ifaddr) == -1) { |
| 231 | perror("getifaddrs"); |
| 232 | return -EIO; |
| 233 | } |
| 234 | |
| 235 | for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) { |
Harald Welte | 4d3a7b1 | 2011-05-24 21:31:53 +0200 | [diff] [blame] | 236 | if (!ifa->ifa_addr) |
| 237 | continue; |
Harald Welte | 33cb71a | 2011-05-21 18:54:32 +0200 | [diff] [blame] | 238 | if (sockaddr_equal(ifa->ifa_addr, addr, addrlen)) |
| 239 | return 1; |
| 240 | } |
| 241 | |
| 242 | return 0; |
| 243 | } |
Harald Welte | e476442 | 2011-05-22 12:25:57 +0200 | [diff] [blame] | 244 | |
| 245 | #endif /* HAVE_SYS_SOCKET_H */ |
Harald Welte | ba6988b | 2011-08-17 12:46:48 +0200 | [diff] [blame] | 246 | |
| 247 | /*! }@ */ |