Daniel Willmann | 27da244 | 2010-10-21 15:00:36 +0200 | [diff] [blame] | 1 | /* SNMP-like status interface |
| 2 | * |
| 3 | * (C) 2010-2011 by Daniel Willmann <daniel@totalueberwachung.de> |
| 4 | * (C) 2010-2011 by On-Waves |
| 5 | * |
| 6 | * All Rights Reserved |
| 7 | * |
| 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 | |
| 24 | #include <errno.h> |
| 25 | #include <stdio.h> |
| 26 | #include <stdlib.h> |
| 27 | #include <string.h> |
| 28 | #include <time.h> |
| 29 | #include <unistd.h> |
| 30 | |
| 31 | #include <arpa/inet.h> |
| 32 | |
| 33 | #include <netinet/tcp.h> |
| 34 | |
| 35 | #include <sys/fcntl.h> |
| 36 | #include <sys/ioctl.h> |
| 37 | #include <sys/socket.h> |
| 38 | #include <sys/types.h> |
| 39 | |
| 40 | #include <openbsc/control_cmd.h> |
| 41 | #include <openbsc/debug.h> |
| 42 | #include <openbsc/e1_input.h> |
| 43 | #include <openbsc/gsm_data.h> |
| 44 | #include <openbsc/ipaccess.h> |
| 45 | #include <openbsc/socket.h> |
| 46 | #include <openbsc/subchan_demux.h> |
| 47 | |
| 48 | #include <openbsc/abis_rsl.h> |
| 49 | #include <openbsc/abis_nm.h> |
| 50 | |
| 51 | #include <osmocom/core/msgb.h> |
| 52 | #include <osmocom/core/select.h> |
| 53 | #include <osmocom/core/talloc.h> |
| 54 | |
| 55 | #include <osmocom/gsm/tlv.h> |
| 56 | |
| 57 | #include <osmocom/vty/command.h> |
| 58 | #include <osmocom/vty/vector.h> |
| 59 | |
| 60 | struct ctrl_handle { |
| 61 | struct osmo_fd listen_fd; |
| 62 | struct gsm_network *gsmnet; |
| 63 | }; |
| 64 | |
| 65 | vector ctrl_node_vec; |
| 66 | |
| 67 | int ctrl_cmd_send(struct osmo_wqueue *queue, struct ctrl_cmd *cmd) |
| 68 | { |
| 69 | int ret; |
| 70 | struct msgb *msg; |
| 71 | |
| 72 | msg = ctrl_cmd_make(cmd); |
| 73 | if (!msg) { |
| 74 | LOGP(DINP, LOGL_ERROR, "Could not generate msg\n"); |
| 75 | return -1; |
| 76 | } |
| 77 | |
| 78 | ipaccess_prepend_header_ext(msg, IPAC_PROTO_EXT_CTRL); |
| 79 | ipaccess_prepend_header(msg, IPAC_PROTO_OSMO); |
| 80 | |
| 81 | ret = osmo_wqueue_enqueue(queue, msg); |
| 82 | if (ret != 0) { |
| 83 | LOGP(DINP, LOGL_ERROR, "Failed to enqueue the command.\n"); |
| 84 | msgb_free(msg); |
| 85 | } |
| 86 | return ret; |
| 87 | } |
| 88 | |
| 89 | int ctrl_cmd_handle(struct ctrl_cmd *cmd, void *data) |
| 90 | { |
| 91 | char *token, *request; |
| 92 | int num, i, j, ret, node; |
| 93 | struct gsm_network *gsmnet = data; |
| 94 | |
| 95 | struct gsm_network *net = NULL; |
| 96 | struct gsm_bts *bts = NULL; |
| 97 | struct gsm_bts_trx *trx = NULL; |
| 98 | struct gsm_bts_trx_ts *ts = NULL; |
| 99 | vector vline, cmdvec, cmds_vec; |
| 100 | |
| 101 | ret = CTRL_CMD_ERROR; |
| 102 | cmd->reply = "Someone forgot to fill in the reply."; |
| 103 | cmd->node = NULL; |
| 104 | node = CTRL_NODE_ROOT; |
| 105 | |
| 106 | request = talloc_strdup(tall_bsc_ctx, cmd->variable); |
| 107 | if (!request) |
| 108 | goto err; |
| 109 | |
| 110 | for (i=0;i<strlen(request);i++) { |
| 111 | if (request[i] == '.') |
| 112 | request[i] = ' '; |
| 113 | } |
| 114 | |
| 115 | vline = cmd_make_strvec(request); |
| 116 | talloc_free(request); |
| 117 | if (!vline) |
| 118 | goto err; |
| 119 | |
| 120 | for (i=0;i<vector_active(vline);i++) { |
| 121 | token = vector_slot(vline, i); |
| 122 | /* TODO: We need to make sure that the following chars are digits |
| 123 | * and/or use strtol to check if number conversion was successful |
| 124 | * Right now something like net.bts_stats will not work */ |
| 125 | if (!strcmp(token, "net")) { |
| 126 | net = gsmnet; |
| 127 | if (!net) |
| 128 | break; |
| 129 | cmd->node = net; |
| 130 | node = CTRL_NODE_NET; |
| 131 | } else if (!strncmp(token, "bts", 3)) { |
| 132 | if (!net) |
| 133 | break; |
| 134 | num = atoi(&token[3]); |
| 135 | bts = gsm_bts_num(net, num); |
| 136 | if (!bts) |
| 137 | break; |
| 138 | cmd->node = bts; |
| 139 | node = CTRL_NODE_BTS; |
| 140 | } else if (!strncmp(token, "trx", 3)) { |
| 141 | if (!bts) |
| 142 | break; |
| 143 | num = atoi(&token[3]); |
| 144 | trx = gsm_bts_trx_num(bts, num); |
| 145 | if (!trx) |
| 146 | break; |
| 147 | cmd->node = trx; |
| 148 | node = CTRL_NODE_TRX; |
| 149 | } else if (!strncmp(token, "ts", 2)) { |
| 150 | if (!trx) |
| 151 | break; |
| 152 | num = atoi(&token[2]); |
| 153 | if ((num >= 0) && (num < TRX_NR_TS)) |
| 154 | ts = &trx->ts[num]; |
| 155 | if (!ts) |
| 156 | break; |
| 157 | cmd->node = ts; |
| 158 | node = CTRL_NODE_TS; |
| 159 | } else { |
| 160 | /* If we're here the rest must be the command */ |
| 161 | cmdvec = vector_init(vector_active(vline)-i); |
| 162 | for (j=i; j<vector_active(vline); j++) { |
| 163 | vector_set(cmdvec, vector_slot(vline, j)); |
| 164 | } |
| 165 | |
| 166 | /* Get the command vector of the right node */ |
| 167 | cmds_vec = vector_lookup(ctrl_node_vec, node); |
| 168 | |
| 169 | if (!cmds_vec) { |
| 170 | cmd->reply = "Command not found"; |
| 171 | vector_free(cmdvec); |
| 172 | break; |
| 173 | } |
| 174 | |
| 175 | ret = ctrl_cmd_exec(cmdvec, cmd, cmds_vec, data); |
| 176 | |
| 177 | vector_free(cmdvec); |
| 178 | break; |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | cmd_free_strvec(vline); |
| 183 | |
| 184 | err: |
| 185 | if (ret == CTRL_CMD_ERROR) |
| 186 | cmd->type = CTRL_TYPE_ERROR; |
| 187 | return ret; |
| 188 | } |
| 189 | |
| 190 | static void control_close_conn(struct ctrl_connection *ccon) |
| 191 | { |
| 192 | close(ccon->write_queue.bfd.fd); |
| 193 | osmo_fd_unregister(&ccon->write_queue.bfd); |
| 194 | if (ccon->closed_cb) |
| 195 | ccon->closed_cb(ccon); |
| 196 | talloc_free(ccon); |
| 197 | } |
| 198 | |
| 199 | static int handle_control_read(struct osmo_fd * bfd) |
| 200 | { |
| 201 | int ret = -1, error; |
| 202 | struct osmo_wqueue *queue; |
| 203 | struct ctrl_connection *ccon; |
| 204 | struct ipaccess_head *iph; |
| 205 | struct ipaccess_head_ext *iph_ext; |
| 206 | struct msgb *msg; |
| 207 | struct ctrl_cmd *cmd; |
| 208 | struct ctrl_handle *ctrl = bfd->data; |
| 209 | |
| 210 | queue = container_of(bfd, struct osmo_wqueue, bfd); |
| 211 | ccon = container_of(queue, struct ctrl_connection, write_queue); |
| 212 | |
| 213 | msg = ipaccess_read_msg(bfd, &error); |
| 214 | |
| 215 | if (!msg) { |
| 216 | if (error == 0) |
| 217 | LOGP(DINP, LOGL_INFO, "The control connection was closed\n"); |
| 218 | else |
| 219 | LOGP(DINP, LOGL_ERROR, "Failed to parse ip access message: %d\n", error); |
| 220 | |
| 221 | goto err; |
| 222 | } |
| 223 | |
| 224 | if (msg->len < sizeof(*iph) + sizeof(*iph_ext)) { |
| 225 | LOGP(DINP, LOGL_ERROR, "The message is too short.\n"); |
| 226 | goto err; |
| 227 | } |
| 228 | |
| 229 | iph = (struct ipaccess_head *) msg->data; |
| 230 | if (iph->proto != IPAC_PROTO_OSMO) { |
| 231 | LOGP(DINP, LOGL_ERROR, "Protocol mismatch. We got 0x%x\n", iph->proto); |
| 232 | goto err; |
| 233 | } |
| 234 | |
| 235 | iph_ext = (struct ipaccess_head_ext *) iph->data; |
| 236 | if (iph_ext->proto != IPAC_PROTO_EXT_CTRL) { |
| 237 | LOGP(DINP, LOGL_ERROR, "Extended protocol mismatch. We got 0x%x\n", iph_ext->proto); |
| 238 | goto err; |
| 239 | } |
| 240 | |
| 241 | msg->l2h = iph_ext->data; |
| 242 | |
| 243 | cmd = ctrl_cmd_parse(ccon, msg); |
| 244 | |
| 245 | if (cmd) { |
| 246 | cmd->ccon = ccon; |
| 247 | if (ctrl_cmd_handle(cmd, ctrl->gsmnet) != CTRL_CMD_HANDLED) { |
| 248 | ctrl_cmd_send(queue, cmd); |
| 249 | talloc_free(cmd); |
| 250 | } |
| 251 | } else { |
| 252 | cmd = talloc_zero(ccon, struct ctrl_cmd); |
| 253 | if (!cmd) |
| 254 | goto err; |
| 255 | LOGP(DINP, LOGL_ERROR, "Command parser error.\n"); |
| 256 | cmd->type = CTRL_TYPE_ERROR; |
| 257 | cmd->id = "err"; |
| 258 | cmd->reply = "Command parser error."; |
| 259 | ctrl_cmd_send(queue, cmd); |
| 260 | talloc_free(cmd); |
| 261 | } |
| 262 | |
| 263 | msgb_free(msg); |
| 264 | return 0; |
| 265 | |
| 266 | err: |
| 267 | control_close_conn(ccon); |
| 268 | msgb_free(msg); |
| 269 | return ret; |
| 270 | } |
| 271 | |
| 272 | static int control_write_cb(struct osmo_fd *bfd, struct msgb *msg) |
| 273 | { |
| 274 | int rc; |
| 275 | |
| 276 | rc = write(bfd->fd, msg->data, msg->len); |
| 277 | if (rc != msg->len) |
| 278 | LOGP(DINP, LOGL_ERROR, "Failed to write message to the control connection.\n"); |
| 279 | |
| 280 | return rc; |
| 281 | } |
| 282 | |
| 283 | static struct ctrl_connection *ctrl_connection_alloc(void *ctx) |
| 284 | { |
| 285 | struct ctrl_connection *ccon = talloc_zero(ctx, struct ctrl_connection); |
| 286 | if (!ccon) |
| 287 | return NULL; |
| 288 | |
| 289 | osmo_wqueue_init(&ccon->write_queue, 100); |
| 290 | /* Error handling here? */ |
| 291 | |
| 292 | INIT_LLIST_HEAD(&ccon->cmds); |
| 293 | return ccon; |
| 294 | } |
| 295 | |
| 296 | static int listen_fd_cb(struct osmo_fd *listen_bfd, unsigned int what) |
| 297 | { |
| 298 | int ret, fd, on; |
| 299 | struct ctrl_connection *ccon; |
| 300 | struct sockaddr_in sa; |
| 301 | socklen_t sa_len = sizeof(sa); |
| 302 | |
| 303 | |
| 304 | if (!(what & BSC_FD_READ)) |
| 305 | return 0; |
| 306 | |
| 307 | fd = accept(listen_bfd->fd, (struct sockaddr *) &sa, &sa_len); |
| 308 | if (fd < 0) { |
| 309 | perror("accept"); |
| 310 | return fd; |
| 311 | } |
| 312 | LOGP(DINP, LOGL_INFO, "accept()ed new control connection from %s\n", |
| 313 | inet_ntoa(sa.sin_addr)); |
| 314 | |
| 315 | on = 1; |
| 316 | ret = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)); |
| 317 | if (ret != 0) { |
| 318 | LOGP(DNAT, LOGL_ERROR, "Failed to set TCP_NODELAY: %s\n", strerror(errno)); |
| 319 | close(fd); |
| 320 | return ret; |
| 321 | } |
| 322 | ccon = ctrl_connection_alloc(listen_bfd->data); |
| 323 | if (!ccon) { |
| 324 | LOGP(DINP, LOGL_ERROR, "Failed to allocate.\n"); |
| 325 | close(fd); |
| 326 | return -1; |
| 327 | } |
| 328 | |
| 329 | ccon->write_queue.bfd.data = listen_bfd->data; |
| 330 | ccon->write_queue.bfd.fd = fd; |
| 331 | ccon->write_queue.bfd.when = BSC_FD_READ; |
| 332 | ccon->write_queue.read_cb = handle_control_read; |
| 333 | ccon->write_queue.write_cb = control_write_cb; |
| 334 | |
| 335 | ret = osmo_fd_register(&ccon->write_queue.bfd); |
| 336 | if (ret < 0) { |
| 337 | LOGP(DINP, LOGL_ERROR, "Could not register FD.\n"); |
| 338 | close(ccon->write_queue.bfd.fd); |
| 339 | talloc_free(ccon); |
| 340 | } |
| 341 | |
| 342 | return ret; |
| 343 | } |
| 344 | |
| 345 | int controlif_setup(struct gsm_network *gsmnet, uint16_t port) |
| 346 | { |
| 347 | int ret; |
| 348 | struct ctrl_handle *ctrl; |
| 349 | |
| 350 | ctrl = talloc_zero(tall_bsc_ctx, struct ctrl_handle); |
| 351 | if (!ctrl) |
| 352 | return -ENOMEM; |
| 353 | |
| 354 | ctrl->gsmnet = gsmnet; |
| 355 | |
| 356 | ctrl_node_vec = vector_init(5); |
| 357 | if (!ctrl_node_vec) |
| 358 | return -ENOMEM; |
| 359 | |
| 360 | /* Listen for control connections */ |
| 361 | ret = make_sock(&ctrl->listen_fd, IPPROTO_TCP, 0, port, |
| 362 | 0, listen_fd_cb, ctrl); |
| 363 | if (ret < 0) { |
| 364 | talloc_free(ctrl); |
| 365 | return ret; |
| 366 | } |
| 367 | |
| 368 | return ret; |
| 369 | } |