Pablo Neira Ayuso | 96e8128 | 2011-06-09 15:06:11 +0200 | [diff] [blame] | 1 | #include "internal.h" |
| 2 | |
| 3 | #include <stdio.h> |
| 4 | #include <unistd.h> |
| 5 | #include <stdlib.h> |
| 6 | #include <errno.h> |
| 7 | #include <string.h> |
| 8 | #include <time.h> |
| 9 | #include <sys/fcntl.h> |
| 10 | #include <sys/socket.h> |
| 11 | #include <sys/ioctl.h> |
| 12 | #include <arpa/inet.h> |
| 13 | |
| 14 | #include <osmocom/core/select.h> |
| 15 | #include <osmocom/gsm/tlv.h> |
| 16 | #include <osmocom/core/msgb.h> |
| 17 | #include <osmocom/core/logging.h> |
| 18 | #include <talloc.h> |
| 19 | #include <osmocom/abis/e1_input.h> |
| 20 | #include <osmocom/abis/ipaccess.h> |
| 21 | #include <osmocom/core/socket.h> |
| 22 | #include <osmocom/abis/logging.h> |
| 23 | |
| 24 | #include <osmocom/abis/ipa.h> |
| 25 | |
| 26 | #define IPA_ALLOC_SIZE 1200 |
| 27 | |
| 28 | static struct msgb *ipa_msg_alloc(void) |
| 29 | { |
| 30 | return msgb_alloc(IPA_ALLOC_SIZE, "Abis/IP"); |
| 31 | } |
| 32 | |
| 33 | int ipa_msg_recv(int fd, struct msgb **rmsg) |
| 34 | { |
| 35 | struct msgb *msg; |
| 36 | struct ipaccess_head *hh; |
| 37 | int len, ret; |
| 38 | |
| 39 | msg = ipa_msg_alloc(); |
| 40 | if (msg == NULL) |
| 41 | return -ENOMEM; |
| 42 | |
| 43 | /* first read our 3-byte header */ |
| 44 | hh = (struct ipaccess_head *) msg->data; |
| 45 | ret = recv(fd, msg->data, sizeof(*hh), 0); |
| 46 | if (ret <= 0) { |
| 47 | msgb_free(msg); |
| 48 | return ret; |
| 49 | } else if (ret != sizeof(*hh)) { |
| 50 | msgb_free(msg); |
| 51 | return -EIO; |
| 52 | } |
| 53 | msgb_put(msg, ret); |
| 54 | |
| 55 | /* then read the length as specified in header */ |
| 56 | msg->l2h = msg->data + sizeof(*hh); |
| 57 | len = ntohs(hh->len); |
| 58 | |
| 59 | if (len < 0 || IPA_ALLOC_SIZE < len + sizeof(*hh)) { |
| 60 | msgb_free(msg); |
| 61 | return -EIO; |
| 62 | } |
| 63 | |
| 64 | ret = recv(fd, msg->l2h, len, 0); |
| 65 | if (ret <= 0) { |
| 66 | msgb_free(msg); |
| 67 | return ret; |
| 68 | } else if (ret < len) { |
| 69 | msgb_free(msg); |
| 70 | return -EIO; |
| 71 | } |
| 72 | msgb_put(msg, ret); |
| 73 | *rmsg = msg; |
| 74 | return ret; |
| 75 | } |
| 76 | |
Pablo Neira Ayuso | c07a8e7 | 2011-06-21 19:50:04 +0200 | [diff] [blame] | 77 | void ipa_client_link_close(struct ipa_client_link *link); |
Pablo Neira Ayuso | 96e8128 | 2011-06-09 15:06:11 +0200 | [diff] [blame] | 78 | |
Pablo Neira Ayuso | c07a8e7 | 2011-06-21 19:50:04 +0200 | [diff] [blame] | 79 | static void ipa_client_retry(struct ipa_client_link *link) |
Pablo Neira Ayuso | 96e8128 | 2011-06-09 15:06:11 +0200 | [diff] [blame] | 80 | { |
| 81 | LOGP(DINP, LOGL_NOTICE, "connection closed\n"); |
| 82 | ipa_client_link_close(link); |
| 83 | LOGP(DINP, LOGL_NOTICE, "retrying in 5 seconds...\n"); |
| 84 | osmo_timer_schedule(&link->timer, 5, 0); |
Pablo Neira Ayuso | c07a8e7 | 2011-06-21 19:50:04 +0200 | [diff] [blame] | 85 | link->state = IPA_CLIENT_LINK_STATE_CONNECTING; |
Pablo Neira Ayuso | 96e8128 | 2011-06-09 15:06:11 +0200 | [diff] [blame] | 86 | } |
| 87 | |
Pablo Neira Ayuso | c07a8e7 | 2011-06-21 19:50:04 +0200 | [diff] [blame] | 88 | void ipa_client_link_close(struct ipa_client_link *link) |
Pablo Neira Ayuso | 96e8128 | 2011-06-09 15:06:11 +0200 | [diff] [blame] | 89 | { |
| 90 | osmo_fd_unregister(&link->ofd); |
| 91 | close(link->ofd.fd); |
| 92 | } |
| 93 | |
Pablo Neira Ayuso | c07a8e7 | 2011-06-21 19:50:04 +0200 | [diff] [blame] | 94 | static void ipa_client_read(struct ipa_client_link *link) |
Pablo Neira Ayuso | 96e8128 | 2011-06-09 15:06:11 +0200 | [diff] [blame] | 95 | { |
| 96 | struct osmo_fd *ofd = &link->ofd; |
| 97 | struct msgb *msg; |
| 98 | int ret; |
| 99 | |
| 100 | LOGP(DINP, LOGL_NOTICE, "message received\n"); |
| 101 | |
| 102 | ret = ipa_msg_recv(ofd->fd, &msg); |
| 103 | if (ret < 0) { |
| 104 | if (errno == EPIPE || errno == ECONNRESET) { |
| 105 | LOGP(DINP, LOGL_ERROR, "lost connection with server\n"); |
| 106 | } else { |
| 107 | LOGP(DINP, LOGL_ERROR, "unknown error\n"); |
| 108 | } |
| 109 | ipa_client_retry(link); |
| 110 | return; |
| 111 | } else if (ret == 0) { |
| 112 | LOGP(DINP, LOGL_ERROR, "connection closed with server\n"); |
| 113 | ipa_client_retry(link); |
| 114 | return; |
| 115 | } |
Pablo Neira Ayuso | 591ddad | 2011-06-21 18:16:42 +0200 | [diff] [blame] | 116 | if (link->cb) |
| 117 | link->cb(link, msg); |
Pablo Neira Ayuso | 96e8128 | 2011-06-09 15:06:11 +0200 | [diff] [blame] | 118 | } |
| 119 | |
Pablo Neira Ayuso | c07a8e7 | 2011-06-21 19:50:04 +0200 | [diff] [blame] | 120 | static void ipa_client_write(struct ipa_client_link *link) |
Pablo Neira Ayuso | 96e8128 | 2011-06-09 15:06:11 +0200 | [diff] [blame] | 121 | { |
| 122 | struct osmo_fd *ofd = &link->ofd; |
| 123 | struct msgb *msg; |
| 124 | struct llist_head *lh; |
| 125 | int ret; |
| 126 | |
| 127 | LOGP(DINP, LOGL_NOTICE, "sending data\n"); |
| 128 | |
| 129 | if (llist_empty(&link->tx_queue)) { |
| 130 | ofd->when &= ~BSC_FD_WRITE; |
| 131 | return; |
| 132 | } |
| 133 | lh = link->tx_queue.next; |
| 134 | llist_del(lh); |
| 135 | msg = llist_entry(lh, struct msgb, list); |
| 136 | |
| 137 | ret = send(link->ofd.fd, msg->data, msg->len, 0); |
| 138 | if (ret < 0) { |
| 139 | if (errno == EPIPE || errno == ENOTCONN) { |
| 140 | ipa_client_retry(link); |
| 141 | } |
| 142 | LOGP(DINP, LOGL_ERROR, "error to send\n"); |
| 143 | } |
| 144 | msgb_free(msg); |
| 145 | } |
| 146 | |
| 147 | int ipa_client_fd_cb(struct osmo_fd *ofd, unsigned int what) |
| 148 | { |
Pablo Neira Ayuso | c07a8e7 | 2011-06-21 19:50:04 +0200 | [diff] [blame] | 149 | struct ipa_client_link *link = ofd->data; |
Pablo Neira Ayuso | 96e8128 | 2011-06-09 15:06:11 +0200 | [diff] [blame] | 150 | int error, ret; |
| 151 | size_t len = sizeof(error); |
| 152 | |
| 153 | switch(link->state) { |
Pablo Neira Ayuso | c07a8e7 | 2011-06-21 19:50:04 +0200 | [diff] [blame] | 154 | case IPA_CLIENT_LINK_STATE_CONNECTING: |
Pablo Neira Ayuso | 96e8128 | 2011-06-09 15:06:11 +0200 | [diff] [blame] | 155 | ret = getsockopt(ofd->fd, SOL_SOCKET, SO_ERROR, &error, &len); |
| 156 | if (ret >= 0 && error > 0) { |
| 157 | ipa_client_retry(link); |
| 158 | return 0; |
| 159 | } |
| 160 | ofd->when &= ~BSC_FD_WRITE; |
| 161 | LOGP(DINP, LOGL_NOTICE, "connection done.\n"); |
Pablo Neira Ayuso | c07a8e7 | 2011-06-21 19:50:04 +0200 | [diff] [blame] | 162 | link->state = IPA_CLIENT_LINK_STATE_CONNECTED; |
Pablo Neira Ayuso | 96e8128 | 2011-06-09 15:06:11 +0200 | [diff] [blame] | 163 | break; |
Pablo Neira Ayuso | c07a8e7 | 2011-06-21 19:50:04 +0200 | [diff] [blame] | 164 | case IPA_CLIENT_LINK_STATE_CONNECTED: |
Pablo Neira Ayuso | 96e8128 | 2011-06-09 15:06:11 +0200 | [diff] [blame] | 165 | LOGP(DINP, LOGL_NOTICE, "connected read/write\n"); |
| 166 | if (what & BSC_FD_READ) |
| 167 | ipa_client_read(link); |
| 168 | if (what & BSC_FD_WRITE) |
| 169 | ipa_client_write(link); |
| 170 | break; |
| 171 | default: |
| 172 | break; |
| 173 | } |
| 174 | return 0; |
| 175 | } |
| 176 | |
| 177 | static void ipa_link_timer_cb(void *data); |
| 178 | |
Pablo Neira Ayuso | c07a8e7 | 2011-06-21 19:50:04 +0200 | [diff] [blame] | 179 | struct ipa_client_link * |
Pablo Neira Ayuso | 591ddad | 2011-06-21 18:16:42 +0200 | [diff] [blame] | 180 | ipa_client_link_create(void *ctx, struct e1inp_line *line, |
| 181 | const char *addr, uint16_t port, |
Pablo Neira Ayuso | c07a8e7 | 2011-06-21 19:50:04 +0200 | [diff] [blame] | 182 | int (*cb)(struct ipa_client_link *link, struct msgb *msgb)) |
Pablo Neira Ayuso | 96e8128 | 2011-06-09 15:06:11 +0200 | [diff] [blame] | 183 | { |
Pablo Neira Ayuso | c07a8e7 | 2011-06-21 19:50:04 +0200 | [diff] [blame] | 184 | struct ipa_client_link *ipa_link; |
Pablo Neira Ayuso | 96e8128 | 2011-06-09 15:06:11 +0200 | [diff] [blame] | 185 | |
Pablo Neira Ayuso | c07a8e7 | 2011-06-21 19:50:04 +0200 | [diff] [blame] | 186 | ipa_link = talloc_zero(ctx, struct ipa_client_link); |
Pablo Neira Ayuso | 96e8128 | 2011-06-09 15:06:11 +0200 | [diff] [blame] | 187 | if (!ipa_link) |
| 188 | return NULL; |
| 189 | |
| 190 | ipa_link->ofd.when |= BSC_FD_READ | BSC_FD_WRITE; |
| 191 | ipa_link->ofd.cb = ipa_client_fd_cb; |
| 192 | ipa_link->ofd.data = ipa_link; |
Pablo Neira Ayuso | c07a8e7 | 2011-06-21 19:50:04 +0200 | [diff] [blame] | 193 | ipa_link->state = IPA_CLIENT_LINK_STATE_CONNECTING; |
Pablo Neira Ayuso | 96e8128 | 2011-06-09 15:06:11 +0200 | [diff] [blame] | 194 | ipa_link->timer.cb = ipa_link_timer_cb; |
| 195 | ipa_link->timer.data = ipa_link; |
Pablo Neira Ayuso | c00ee73 | 2011-06-21 12:22:49 +0200 | [diff] [blame] | 196 | ipa_link->addr = talloc_strdup(ipa_link, addr); |
Pablo Neira Ayuso | 9b3a33c | 2011-06-21 13:52:41 +0200 | [diff] [blame] | 197 | ipa_link->port = port; |
Pablo Neira Ayuso | 591ddad | 2011-06-21 18:16:42 +0200 | [diff] [blame] | 198 | ipa_link->cb = cb; |
| 199 | ipa_link->line = line; |
Pablo Neira Ayuso | 96e8128 | 2011-06-09 15:06:11 +0200 | [diff] [blame] | 200 | |
| 201 | return ipa_link; |
| 202 | } |
| 203 | |
Pablo Neira Ayuso | c07a8e7 | 2011-06-21 19:50:04 +0200 | [diff] [blame] | 204 | void ipa_client_link_destroy(struct ipa_client_link *link) |
Pablo Neira Ayuso | 96e8128 | 2011-06-09 15:06:11 +0200 | [diff] [blame] | 205 | { |
| 206 | talloc_free(link); |
| 207 | } |
| 208 | |
Pablo Neira Ayuso | c07a8e7 | 2011-06-21 19:50:04 +0200 | [diff] [blame] | 209 | int ipa_client_link_open(struct ipa_client_link *link) |
Pablo Neira Ayuso | 96e8128 | 2011-06-09 15:06:11 +0200 | [diff] [blame] | 210 | { |
| 211 | int ret; |
| 212 | |
| 213 | ret = osmo_sock_init(AF_INET, SOCK_STREAM, IPPROTO_TCP, |
Pablo Neira Ayuso | 9b3a33c | 2011-06-21 13:52:41 +0200 | [diff] [blame] | 214 | link->addr, link->port, |
Pablo Neira Ayuso | 96e8128 | 2011-06-09 15:06:11 +0200 | [diff] [blame] | 215 | OSMO_SOCK_F_CONNECT|OSMO_SOCK_F_NONBLOCK); |
| 216 | if (ret < 0) { |
| 217 | if (errno != EINPROGRESS) |
| 218 | return ret; |
| 219 | } |
| 220 | link->ofd.fd = ret; |
| 221 | if (osmo_fd_register(&link->ofd) < 0) { |
| 222 | close(ret); |
| 223 | return -EIO; |
| 224 | } |
| 225 | return 0; |
| 226 | } |
| 227 | |
| 228 | static void ipa_link_timer_cb(void *data) |
| 229 | { |
Pablo Neira Ayuso | c07a8e7 | 2011-06-21 19:50:04 +0200 | [diff] [blame] | 230 | struct ipa_client_link *link = data; |
Pablo Neira Ayuso | 96e8128 | 2011-06-09 15:06:11 +0200 | [diff] [blame] | 231 | |
| 232 | LOGP(DINP, LOGL_NOTICE, "reconnecting.\n"); |
| 233 | |
| 234 | switch(link->state) { |
Pablo Neira Ayuso | c07a8e7 | 2011-06-21 19:50:04 +0200 | [diff] [blame] | 235 | case IPA_CLIENT_LINK_STATE_CONNECTING: |
Pablo Neira Ayuso | 96e8128 | 2011-06-09 15:06:11 +0200 | [diff] [blame] | 236 | ipa_client_link_open(link); |
| 237 | break; |
| 238 | default: |
| 239 | break; |
| 240 | } |
| 241 | } |
Pablo Neira Ayuso | 986191f | 2011-06-21 19:56:26 +0200 | [diff] [blame^] | 242 | |
| 243 | int ipa_server_fd_cb(struct osmo_fd *ofd, unsigned int what) |
| 244 | { |
| 245 | int ret; |
| 246 | struct sockaddr_in sa; |
| 247 | socklen_t sa_len = sizeof(sa); |
| 248 | struct ipa_server_link *link = ofd->data; |
| 249 | |
| 250 | ret = accept(ofd->fd, (struct sockaddr *)&sa, &sa_len); |
| 251 | if (ret < 0) { |
| 252 | LOGP(DINP, LOGL_ERROR, "failed to accept from origin " |
| 253 | "peer, reason=`%s'\n", strerror(errno)); |
| 254 | return ret; |
| 255 | } |
| 256 | LOGP(DINP, LOGL_NOTICE, "accept()ed new link from %s to port %u\n", |
| 257 | inet_ntoa(sa.sin_addr), link->port); |
| 258 | |
| 259 | if (link->accept_cb) |
| 260 | link->accept_cb(link, ret); |
| 261 | |
| 262 | return 0; |
| 263 | } |
| 264 | |
| 265 | struct ipa_server_link * |
| 266 | ipa_server_link_create(void *ctx, struct e1inp_line *line, |
| 267 | const char *addr, uint16_t port, |
| 268 | int (*accept_cb)(struct ipa_server_link *link, int fd)) |
| 269 | { |
| 270 | struct ipa_server_link *ipa_link; |
| 271 | |
| 272 | ipa_link = talloc_zero(ctx, struct ipa_server_link); |
| 273 | if (!ipa_link) |
| 274 | return NULL; |
| 275 | |
| 276 | ipa_link->ofd.when |= BSC_FD_READ | BSC_FD_WRITE; |
| 277 | ipa_link->ofd.cb = ipa_server_fd_cb; |
| 278 | ipa_link->ofd.data = ipa_link; |
| 279 | ipa_link->addr = talloc_strdup(ipa_link, addr); |
| 280 | ipa_link->port = port; |
| 281 | ipa_link->accept_cb = accept_cb; |
| 282 | ipa_link->line = line; |
| 283 | |
| 284 | return ipa_link; |
| 285 | |
| 286 | } |
| 287 | |
| 288 | void ipa_server_link_destroy(struct ipa_server_link *link) |
| 289 | { |
| 290 | talloc_free(link); |
| 291 | } |
| 292 | |
| 293 | int ipa_server_link_open(struct ipa_server_link *link) |
| 294 | { |
| 295 | int ret; |
| 296 | |
| 297 | ret = osmo_sock_init(AF_INET, SOCK_STREAM, IPPROTO_TCP, |
| 298 | link->addr, link->port, OSMO_SOCK_F_BIND); |
| 299 | if (ret < 0) |
| 300 | return ret; |
| 301 | |
| 302 | link->ofd.fd = ret; |
| 303 | if (osmo_fd_register(&link->ofd) < 0) { |
| 304 | close(ret); |
| 305 | return -EIO; |
| 306 | } |
| 307 | return 0; |
| 308 | } |
| 309 | |
| 310 | void ipa_server_link_close(struct ipa_server_link *link) |
| 311 | { |
| 312 | osmo_fd_unregister(&link->ofd); |
| 313 | close(link->ofd.fd); |
| 314 | } |