[48de515] | 1 | /* |
---|
| 2 | * Copyright (C) 2020 Soleta Networks <info@soleta.eu> |
---|
| 3 | * |
---|
| 4 | * This program is free software: you can redistribute it and/or modify it under |
---|
| 5 | * the terms of the GNU Affero General Public License as published by the |
---|
| 6 | * Free Software Foundation, version 3. |
---|
| 7 | */ |
---|
| 8 | |
---|
| 9 | #include "ogAdmServer.h" |
---|
| 10 | #include "dbi.h" |
---|
| 11 | #include "utils.h" |
---|
| 12 | #include "list.h" |
---|
| 13 | #include "rest.h" |
---|
| 14 | #include "client.h" |
---|
| 15 | #include "json.h" |
---|
| 16 | #include "schedule.h" |
---|
| 17 | #include <syslog.h> |
---|
| 18 | #include <sys/ioctl.h> |
---|
| 19 | #include <ifaddrs.h> |
---|
| 20 | #include <sys/types.h> |
---|
| 21 | #include <sys/stat.h> |
---|
| 22 | #include <fcntl.h> |
---|
| 23 | #include <jansson.h> |
---|
| 24 | #include <time.h> |
---|
| 25 | |
---|
| 26 | static void og_client_release(struct ev_loop *loop, struct og_client *cli) |
---|
| 27 | { |
---|
| 28 | if (cli->keepalive_idx >= 0) { |
---|
| 29 | syslog(LOG_DEBUG, "closing keepalive connection for %s:%hu in slot %d\n", |
---|
| 30 | inet_ntoa(cli->addr.sin_addr), |
---|
| 31 | ntohs(cli->addr.sin_port), cli->keepalive_idx); |
---|
| 32 | tbsockets[cli->keepalive_idx].cli = NULL; |
---|
| 33 | } |
---|
| 34 | |
---|
| 35 | list_del(&cli->list); |
---|
| 36 | ev_io_stop(loop, &cli->io); |
---|
| 37 | close(cli->io.fd); |
---|
| 38 | free(cli); |
---|
| 39 | } |
---|
| 40 | |
---|
| 41 | static void og_client_keepalive(struct ev_loop *loop, struct og_client *cli) |
---|
| 42 | { |
---|
| 43 | struct og_client *old_cli; |
---|
| 44 | |
---|
| 45 | old_cli = tbsockets[cli->keepalive_idx].cli; |
---|
| 46 | if (old_cli && old_cli != cli) { |
---|
| 47 | syslog(LOG_DEBUG, "closing old keepalive connection for %s:%hu\n", |
---|
| 48 | inet_ntoa(old_cli->addr.sin_addr), |
---|
| 49 | ntohs(old_cli->addr.sin_port)); |
---|
| 50 | |
---|
| 51 | og_client_release(loop, old_cli); |
---|
| 52 | } |
---|
| 53 | tbsockets[cli->keepalive_idx].cli = cli; |
---|
| 54 | } |
---|
| 55 | |
---|
| 56 | static void og_client_reset_state(struct og_client *cli) |
---|
| 57 | { |
---|
| 58 | cli->state = OG_CLIENT_RECEIVING_HEADER; |
---|
| 59 | cli->buf_len = 0; |
---|
| 60 | } |
---|
| 61 | |
---|
| 62 | static int og_client_payload_too_large(struct og_client *cli) |
---|
| 63 | { |
---|
| 64 | char buf[] = "HTTP/1.1 413 Payload Too Large\r\n" |
---|
| 65 | "Content-Length: 0\r\n\r\n"; |
---|
| 66 | |
---|
| 67 | send(og_client_socket(cli), buf, strlen(buf), 0); |
---|
| 68 | |
---|
| 69 | return -1; |
---|
| 70 | } |
---|
| 71 | |
---|
| 72 | static int og_client_state_recv_hdr_rest(struct og_client *cli) |
---|
| 73 | { |
---|
| 74 | char *ptr; |
---|
| 75 | |
---|
| 76 | ptr = strstr(cli->buf, "\r\n\r\n"); |
---|
| 77 | if (!ptr) |
---|
| 78 | return 0; |
---|
| 79 | |
---|
| 80 | cli->msg_len = ptr - cli->buf + 4; |
---|
| 81 | |
---|
| 82 | ptr = strstr(cli->buf, "Content-Length: "); |
---|
| 83 | if (ptr) { |
---|
| 84 | sscanf(ptr, "Content-Length: %i[^\r\n]", &cli->content_length); |
---|
| 85 | if (cli->content_length < 0) |
---|
| 86 | return -1; |
---|
| 87 | cli->msg_len += cli->content_length; |
---|
| 88 | } |
---|
| 89 | |
---|
| 90 | ptr = strstr(cli->buf, "Authorization: "); |
---|
| 91 | if (ptr) |
---|
| 92 | sscanf(ptr, "Authorization: %63[^\r\n]", cli->auth_token); |
---|
| 93 | |
---|
| 94 | return 1; |
---|
| 95 | } |
---|
| 96 | |
---|
| 97 | static int og_client_recv(struct og_client *cli, int events) |
---|
| 98 | { |
---|
| 99 | struct ev_io *io = &cli->io; |
---|
| 100 | int ret; |
---|
| 101 | |
---|
| 102 | if (events & EV_ERROR) { |
---|
| 103 | syslog(LOG_ERR, "unexpected error event from client %s:%hu\n", |
---|
| 104 | inet_ntoa(cli->addr.sin_addr), |
---|
| 105 | ntohs(cli->addr.sin_port)); |
---|
| 106 | return 0; |
---|
| 107 | } |
---|
| 108 | |
---|
| 109 | ret = recv(io->fd, cli->buf + cli->buf_len, |
---|
| 110 | sizeof(cli->buf) - cli->buf_len, 0); |
---|
| 111 | if (ret <= 0) { |
---|
| 112 | if (ret < 0) { |
---|
| 113 | syslog(LOG_ERR, "error reading from client %s:%hu (%s)\n", |
---|
| 114 | inet_ntoa(cli->addr.sin_addr), ntohs(cli->addr.sin_port), |
---|
| 115 | strerror(errno)); |
---|
| 116 | } else { |
---|
| 117 | syslog(LOG_DEBUG, "closed connection by %s:%hu\n", |
---|
| 118 | inet_ntoa(cli->addr.sin_addr), ntohs(cli->addr.sin_port)); |
---|
| 119 | } |
---|
| 120 | return ret; |
---|
| 121 | } |
---|
| 122 | |
---|
| 123 | return ret; |
---|
| 124 | } |
---|
| 125 | |
---|
| 126 | static void og_client_read_cb(struct ev_loop *loop, struct ev_io *io, int events) |
---|
| 127 | { |
---|
| 128 | struct og_client *cli; |
---|
| 129 | int ret; |
---|
| 130 | |
---|
| 131 | cli = container_of(io, struct og_client, io); |
---|
| 132 | |
---|
| 133 | ret = og_client_recv(cli, events); |
---|
| 134 | if (ret <= 0) |
---|
| 135 | goto close; |
---|
| 136 | |
---|
| 137 | if (cli->keepalive_idx >= 0) |
---|
| 138 | return; |
---|
| 139 | |
---|
| 140 | ev_timer_again(loop, &cli->timer); |
---|
| 141 | |
---|
| 142 | cli->buf_len += ret; |
---|
| 143 | if (cli->buf_len >= sizeof(cli->buf)) { |
---|
| 144 | syslog(LOG_ERR, "client request from %s:%hu is too long\n", |
---|
| 145 | inet_ntoa(cli->addr.sin_addr), ntohs(cli->addr.sin_port)); |
---|
| 146 | og_client_payload_too_large(cli); |
---|
| 147 | goto close; |
---|
| 148 | } |
---|
| 149 | |
---|
| 150 | switch (cli->state) { |
---|
| 151 | case OG_CLIENT_RECEIVING_HEADER: |
---|
| 152 | ret = og_client_state_recv_hdr_rest(cli); |
---|
| 153 | if (ret < 0) |
---|
| 154 | goto close; |
---|
| 155 | if (!ret) |
---|
| 156 | return; |
---|
| 157 | |
---|
| 158 | cli->state = OG_CLIENT_RECEIVING_PAYLOAD; |
---|
| 159 | /* Fall through. */ |
---|
| 160 | case OG_CLIENT_RECEIVING_PAYLOAD: |
---|
| 161 | /* Still not enough data to process request. */ |
---|
| 162 | if (cli->buf_len < cli->msg_len) |
---|
| 163 | return; |
---|
| 164 | |
---|
| 165 | cli->state = OG_CLIENT_PROCESSING_REQUEST; |
---|
| 166 | /* fall through. */ |
---|
| 167 | case OG_CLIENT_PROCESSING_REQUEST: |
---|
| 168 | ret = og_client_state_process_payload_rest(cli); |
---|
| 169 | if (ret < 0) { |
---|
| 170 | syslog(LOG_ERR, "Failed to process HTTP request from %s:%hu\n", |
---|
| 171 | inet_ntoa(cli->addr.sin_addr), |
---|
| 172 | ntohs(cli->addr.sin_port)); |
---|
| 173 | } |
---|
| 174 | if (ret < 0) |
---|
| 175 | goto close; |
---|
| 176 | |
---|
| 177 | if (cli->keepalive_idx < 0) { |
---|
| 178 | syslog(LOG_DEBUG, "server closing connection to %s:%hu\n", |
---|
| 179 | inet_ntoa(cli->addr.sin_addr), ntohs(cli->addr.sin_port)); |
---|
| 180 | goto close; |
---|
| 181 | } else { |
---|
| 182 | syslog(LOG_DEBUG, "leaving client %s:%hu in keepalive mode\n", |
---|
| 183 | inet_ntoa(cli->addr.sin_addr), |
---|
| 184 | ntohs(cli->addr.sin_port)); |
---|
| 185 | og_client_keepalive(loop, cli); |
---|
| 186 | og_client_reset_state(cli); |
---|
| 187 | } |
---|
| 188 | break; |
---|
| 189 | default: |
---|
| 190 | syslog(LOG_ERR, "unknown state, critical internal error\n"); |
---|
| 191 | goto close; |
---|
| 192 | } |
---|
| 193 | return; |
---|
| 194 | close: |
---|
| 195 | ev_timer_stop(loop, &cli->timer); |
---|
| 196 | og_client_release(loop, cli); |
---|
| 197 | } |
---|
| 198 | |
---|
| 199 | enum og_agent_state { |
---|
| 200 | OG_AGENT_RECEIVING_HEADER = 0, |
---|
| 201 | OG_AGENT_RECEIVING_PAYLOAD, |
---|
| 202 | OG_AGENT_PROCESSING_RESPONSE, |
---|
| 203 | }; |
---|
| 204 | |
---|
| 205 | static int og_agent_state_recv_hdr_rest(struct og_client *cli) |
---|
| 206 | { |
---|
| 207 | char *ptr; |
---|
| 208 | |
---|
| 209 | ptr = strstr(cli->buf, "\r\n\r\n"); |
---|
| 210 | if (!ptr) |
---|
| 211 | return 0; |
---|
| 212 | |
---|
| 213 | cli->msg_len = ptr - cli->buf + 4; |
---|
| 214 | |
---|
| 215 | ptr = strstr(cli->buf, "Content-Length: "); |
---|
| 216 | if (ptr) { |
---|
| 217 | sscanf(ptr, "Content-Length: %i[^\r\n]", &cli->content_length); |
---|
| 218 | if (cli->content_length < 0) |
---|
| 219 | return -1; |
---|
| 220 | cli->msg_len += cli->content_length; |
---|
| 221 | } |
---|
| 222 | |
---|
| 223 | return 1; |
---|
| 224 | } |
---|
| 225 | |
---|
| 226 | static void og_agent_reset_state(struct og_client *cli) |
---|
| 227 | { |
---|
| 228 | cli->state = OG_AGENT_RECEIVING_HEADER; |
---|
| 229 | cli->buf_len = 0; |
---|
| 230 | cli->content_length = 0; |
---|
| 231 | memset(cli->buf, 0, sizeof(cli->buf)); |
---|
| 232 | } |
---|
| 233 | |
---|
| 234 | static void og_agent_deliver_pending_cmd(struct og_client *cli) |
---|
| 235 | { |
---|
| 236 | const struct og_cmd *cmd; |
---|
| 237 | |
---|
| 238 | cmd = og_cmd_find(inet_ntoa(cli->addr.sin_addr)); |
---|
| 239 | if (!cmd) |
---|
| 240 | return; |
---|
| 241 | |
---|
| 242 | og_send_request(cmd->method, cmd->type, &cmd->params, cmd->json); |
---|
| 243 | cli->last_cmd_id = cmd->id; |
---|
| 244 | |
---|
| 245 | og_cmd_free(cmd); |
---|
| 246 | } |
---|
| 247 | |
---|
| 248 | static void og_agent_read_cb(struct ev_loop *loop, struct ev_io *io, int events) |
---|
| 249 | { |
---|
| 250 | struct og_client *cli; |
---|
| 251 | int ret; |
---|
| 252 | |
---|
| 253 | cli = container_of(io, struct og_client, io); |
---|
| 254 | |
---|
| 255 | ret = og_client_recv(cli, events); |
---|
| 256 | if (ret <= 0) |
---|
| 257 | goto close; |
---|
| 258 | |
---|
| 259 | ev_timer_again(loop, &cli->timer); |
---|
| 260 | |
---|
| 261 | cli->buf_len += ret; |
---|
| 262 | if (cli->buf_len >= sizeof(cli->buf)) { |
---|
| 263 | syslog(LOG_ERR, "client request from %s:%hu is too long\n", |
---|
| 264 | inet_ntoa(cli->addr.sin_addr), ntohs(cli->addr.sin_port)); |
---|
| 265 | goto close; |
---|
| 266 | } |
---|
| 267 | |
---|
| 268 | switch (cli->state) { |
---|
| 269 | case OG_AGENT_RECEIVING_HEADER: |
---|
| 270 | ret = og_agent_state_recv_hdr_rest(cli); |
---|
| 271 | if (ret < 0) |
---|
| 272 | goto close; |
---|
| 273 | if (!ret) |
---|
| 274 | return; |
---|
| 275 | |
---|
| 276 | cli->state = OG_AGENT_RECEIVING_PAYLOAD; |
---|
| 277 | /* Fall through. */ |
---|
| 278 | case OG_AGENT_RECEIVING_PAYLOAD: |
---|
| 279 | /* Still not enough data to process request. */ |
---|
| 280 | if (cli->buf_len < cli->msg_len) |
---|
| 281 | return; |
---|
| 282 | |
---|
| 283 | cli->state = OG_AGENT_PROCESSING_RESPONSE; |
---|
| 284 | /* fall through. */ |
---|
| 285 | case OG_AGENT_PROCESSING_RESPONSE: |
---|
| 286 | ret = og_agent_state_process_response(cli); |
---|
| 287 | if (ret < 0) { |
---|
| 288 | syslog(LOG_ERR, "Failed to process HTTP request from %s:%hu\n", |
---|
| 289 | inet_ntoa(cli->addr.sin_addr), |
---|
| 290 | ntohs(cli->addr.sin_port)); |
---|
| 291 | goto close; |
---|
| 292 | } else if (ret == 0) { |
---|
| 293 | og_agent_deliver_pending_cmd(cli); |
---|
| 294 | } |
---|
| 295 | |
---|
| 296 | syslog(LOG_DEBUG, "leaving client %s:%hu in keepalive mode\n", |
---|
| 297 | inet_ntoa(cli->addr.sin_addr), |
---|
| 298 | ntohs(cli->addr.sin_port)); |
---|
| 299 | og_agent_reset_state(cli); |
---|
| 300 | break; |
---|
| 301 | default: |
---|
| 302 | syslog(LOG_ERR, "unknown state, critical internal error\n"); |
---|
| 303 | goto close; |
---|
| 304 | } |
---|
| 305 | return; |
---|
| 306 | close: |
---|
| 307 | ev_timer_stop(loop, &cli->timer); |
---|
| 308 | og_client_release(loop, cli); |
---|
| 309 | } |
---|
| 310 | |
---|
| 311 | static void og_client_timer_cb(struct ev_loop *loop, ev_timer *timer, int events) |
---|
| 312 | { |
---|
| 313 | struct og_client *cli; |
---|
| 314 | |
---|
| 315 | cli = container_of(timer, struct og_client, timer); |
---|
| 316 | if (cli->keepalive_idx >= 0) { |
---|
| 317 | ev_timer_again(loop, &cli->timer); |
---|
| 318 | return; |
---|
| 319 | } |
---|
| 320 | syslog(LOG_ERR, "timeout request for client %s:%hu\n", |
---|
| 321 | inet_ntoa(cli->addr.sin_addr), ntohs(cli->addr.sin_port)); |
---|
| 322 | |
---|
| 323 | og_client_release(loop, cli); |
---|
| 324 | } |
---|
| 325 | |
---|
| 326 | static void og_agent_send_refresh(struct og_client *cli) |
---|
| 327 | { |
---|
| 328 | struct og_msg_params params; |
---|
| 329 | int err; |
---|
| 330 | |
---|
| 331 | params.ips_array[0] = inet_ntoa(cli->addr.sin_addr); |
---|
| 332 | params.ips_array_len = 1; |
---|
| 333 | |
---|
| 334 | err = og_send_request(OG_METHOD_GET, OG_CMD_REFRESH, ¶ms, NULL); |
---|
| 335 | if (err < 0) { |
---|
| 336 | syslog(LOG_ERR, "Can't send refresh to: %s\n", |
---|
| 337 | params.ips_array[0]); |
---|
| 338 | } else { |
---|
| 339 | syslog(LOG_INFO, "Sent refresh to: %s\n", |
---|
| 340 | params.ips_array[0]); |
---|
| 341 | } |
---|
| 342 | } |
---|
| 343 | |
---|
| 344 | /* Shut down connection if there is no complete message after 10 seconds. */ |
---|
| 345 | #define OG_CLIENT_TIMEOUT 10 |
---|
| 346 | |
---|
| 347 | /* Agent client operation might take longer, shut down after 30 seconds. */ |
---|
| 348 | #define OG_AGENT_CLIENT_TIMEOUT 30 |
---|
| 349 | |
---|
| 350 | int socket_rest, socket_agent_rest; |
---|
| 351 | |
---|
| 352 | void og_server_accept_cb(struct ev_loop *loop, struct ev_io *io, int events) |
---|
| 353 | { |
---|
| 354 | struct sockaddr_in client_addr; |
---|
| 355 | socklen_t addrlen = sizeof(client_addr); |
---|
| 356 | struct og_client *cli; |
---|
| 357 | int client_sd; |
---|
| 358 | |
---|
| 359 | if (events & EV_ERROR) |
---|
| 360 | return; |
---|
| 361 | |
---|
| 362 | client_sd = accept(io->fd, (struct sockaddr *)&client_addr, &addrlen); |
---|
| 363 | if (client_sd < 0) { |
---|
| 364 | syslog(LOG_ERR, "cannot accept client connection\n"); |
---|
| 365 | return; |
---|
| 366 | } |
---|
| 367 | |
---|
| 368 | cli = (struct og_client *)calloc(1, sizeof(struct og_client)); |
---|
| 369 | if (!cli) { |
---|
| 370 | close(client_sd); |
---|
| 371 | return; |
---|
| 372 | } |
---|
| 373 | memcpy(&cli->addr, &client_addr, sizeof(client_addr)); |
---|
| 374 | if (io->fd == socket_agent_rest) |
---|
| 375 | cli->keepalive_idx = 0; |
---|
| 376 | else |
---|
| 377 | cli->keepalive_idx = -1; |
---|
| 378 | |
---|
| 379 | if (io->fd == socket_rest) |
---|
| 380 | cli->rest = true; |
---|
| 381 | else if (io->fd == socket_agent_rest) |
---|
| 382 | cli->agent = true; |
---|
| 383 | |
---|
| 384 | syslog(LOG_DEBUG, "connection from client %s:%hu\n", |
---|
| 385 | inet_ntoa(cli->addr.sin_addr), ntohs(cli->addr.sin_port)); |
---|
| 386 | |
---|
| 387 | if (io->fd == socket_agent_rest) |
---|
| 388 | ev_io_init(&cli->io, og_agent_read_cb, client_sd, EV_READ); |
---|
| 389 | else |
---|
| 390 | ev_io_init(&cli->io, og_client_read_cb, client_sd, EV_READ); |
---|
| 391 | |
---|
| 392 | ev_io_start(loop, &cli->io); |
---|
| 393 | if (io->fd == socket_agent_rest) { |
---|
| 394 | ev_timer_init(&cli->timer, og_client_timer_cb, |
---|
| 395 | OG_AGENT_CLIENT_TIMEOUT, 0.); |
---|
| 396 | } else { |
---|
| 397 | ev_timer_init(&cli->timer, og_client_timer_cb, |
---|
| 398 | OG_CLIENT_TIMEOUT, 0.); |
---|
| 399 | } |
---|
| 400 | ev_timer_start(loop, &cli->timer); |
---|
| 401 | og_client_add(cli); |
---|
| 402 | |
---|
| 403 | if (io->fd == socket_agent_rest) { |
---|
| 404 | og_agent_send_refresh(cli); |
---|
| 405 | } |
---|
| 406 | } |
---|
| 407 | |
---|
| 408 | int og_socket_server_init(const char *port) |
---|
| 409 | { |
---|
| 410 | struct sockaddr_in local; |
---|
| 411 | int sd, on = 1; |
---|
| 412 | |
---|
| 413 | sd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); |
---|
| 414 | if (sd < 0) { |
---|
| 415 | syslog(LOG_ERR, "cannot create main socket\n"); |
---|
| 416 | return -1; |
---|
| 417 | } |
---|
| 418 | setsockopt(sd, SOL_SOCKET, SO_REUSEPORT, &on, sizeof(int)); |
---|
| 419 | |
---|
| 420 | local.sin_addr.s_addr = htonl(INADDR_ANY); |
---|
| 421 | local.sin_family = AF_INET; |
---|
| 422 | local.sin_port = htons(atoi(port)); |
---|
| 423 | |
---|
| 424 | if (bind(sd, (struct sockaddr *) &local, sizeof(local)) < 0) { |
---|
| 425 | close(sd); |
---|
| 426 | syslog(LOG_ERR, "cannot bind socket\n"); |
---|
| 427 | return -1; |
---|
| 428 | } |
---|
| 429 | |
---|
| 430 | listen(sd, 250); |
---|
| 431 | |
---|
| 432 | return sd; |
---|
| 433 | } |
---|