1 /* 2 * Copyright (c) 2008-2014, Simon Schubert <2@0x2c.org>. 3 * Copyright (c) 2008 The DragonFly Project. All rights reserved. 4 * 5 * This code is derived from software contributed to The DragonFly Project 6 * by Simon Schubert <2@0x2c.org>. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the 17 * distribution. 18 * 3. Neither the name of The DragonFly Project nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific, prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include "dfcompat.h" 37 38 #include <sys/file.h> 39 #include <sys/stat.h> 40 41 #include <ctype.h> 42 #include <dirent.h> 43 #include <err.h> 44 #include <errno.h> 45 #include <fcntl.h> 46 #include <inttypes.h> 47 #include <unistd.h> 48 #include <syslog.h> 49 50 #include "dma.h" 51 52 /* 53 * Spool file format: 54 * 55 * 'Q'id files (queue): 56 * Organized like an RFC822 header, field: value. Ignores unknown fields. 57 * ID: id 58 * Sender: envelope-from 59 * Recipient: envelope-to 60 * 61 * 'M'id files (data): 62 * mail data 63 * 64 * Each queue file needs to have a corresponding data file. 65 * One data file might be shared by linking it several times. 66 * 67 * Queue ids are unique, formed from the inode of the data file 68 * and a unique identifier. 69 */ 70 71 int 72 newspoolf(struct queue *queue) 73 { 74 char fn[PATH_MAX+1]; 75 struct stat st; 76 struct stritem *t; 77 int fd; 78 79 if (snprintf(fn, sizeof(fn), "%s/%s", config.spooldir, "tmp_XXXXXXXXXX") <= 0) 80 return (-1); 81 82 fd = mkstemp(fn); 83 if (fd < 0) 84 return (-1); 85 /* XXX group rights */ 86 if (fchmod(fd, 0660) < 0) 87 goto fail; 88 if (flock(fd, LOCK_EX) == -1) 89 goto fail; 90 queue->tmpf = strdup(fn); 91 if (queue->tmpf == NULL) 92 goto fail; 93 94 /* 95 * Assign queue id 96 */ 97 if (fstat(fd, &st) != 0) 98 goto fail; 99 if (asprintf(&queue->id, "%"PRIxMAX, (uintmax_t)st.st_ino) < 0) 100 goto fail; 101 102 queue->mailf = fdopen(fd, "r+"); 103 if (queue->mailf == NULL) 104 goto fail; 105 106 t = malloc(sizeof(*t)); 107 if (t != NULL) { 108 t->str = queue->tmpf; 109 SLIST_INSERT_HEAD(&tmpfs, t, next); 110 } 111 return (0); 112 113 fail: 114 if (queue->mailf != NULL) 115 fclose(queue->mailf); 116 close(fd); 117 unlink(fn); 118 return (-1); 119 } 120 121 static int 122 writequeuef(struct qitem *it) 123 { 124 int error; 125 int queuefd; 126 127 queuefd = open_locked(it->queuefn, O_CREAT|O_EXCL|O_RDWR, 0660); 128 if (queuefd == -1) 129 return (-1); 130 if (fchmod(queuefd, 0660) < 0) 131 return (-1); 132 it->queuef = fdopen(queuefd, "w+"); 133 if (it->queuef == NULL) 134 return (-1); 135 136 error = fprintf(it->queuef, 137 "ID: %s\n" 138 "Sender: %s\n" 139 "Recipient: %s\n", 140 it->queueid, 141 it->sender, 142 it->addr); 143 144 if (error <= 0) 145 return (-1); 146 147 if (fflush(it->queuef) != 0 || fsync(fileno(it->queuef)) != 0) 148 return (-1); 149 150 return (0); 151 } 152 153 static struct qitem * 154 readqueuef(struct queue *queue, char *queuefn) 155 { 156 char line[1000]; 157 struct queue itmqueue; 158 FILE *queuef = NULL; 159 char *s; 160 char *queueid = NULL, *sender = NULL, *addr = NULL; 161 struct qitem *it = NULL; 162 163 bzero(&itmqueue, sizeof(itmqueue)); 164 LIST_INIT(&itmqueue.queue); 165 166 queuef = fopen(queuefn, "r"); 167 if (queuef == NULL) 168 goto out; 169 170 while (!feof(queuef)) { 171 if (fgets(line, sizeof(line), queuef) == NULL || line[0] == 0) 172 break; 173 line[strlen(line) - 1] = 0; /* chop newline */ 174 175 s = strchr(line, ':'); 176 if (s == NULL) 177 goto malformed; 178 *s = 0; 179 180 s++; 181 while (isspace(*s)) 182 s++; 183 184 s = strdup(s); 185 if (s == NULL) 186 goto malformed; 187 188 if (strcmp(line, "ID") == 0) { 189 queueid = s; 190 } else if (strcmp(line, "Sender") == 0) { 191 sender = s; 192 } else if (strcmp(line, "Recipient") == 0) { 193 addr = s; 194 } else { 195 syslog(LOG_DEBUG, "ignoring unknown queue info `%s' in `%s'", 196 line, queuefn); 197 free(s); 198 } 199 } 200 201 if (queueid == NULL || sender == NULL || addr == NULL || 202 *queueid == 0 || *addr == 0) { 203 malformed: 204 errno = EINVAL; 205 syslog(LOG_ERR, "malformed queue file `%s'", queuefn); 206 goto out; 207 } 208 209 if (add_recp(&itmqueue, addr, 0) != 0) 210 goto out; 211 212 it = LIST_FIRST(&itmqueue.queue); 213 it->sender = sender; sender = NULL; 214 it->queueid = queueid; queueid = NULL; 215 it->queuefn = queuefn; queuefn = NULL; 216 LIST_INSERT_HEAD(&queue->queue, it, next); 217 218 out: 219 if (sender != NULL) 220 free(sender); 221 if (queueid != NULL) 222 free(queueid); 223 if (addr != NULL) 224 free(addr); 225 if (queuef != NULL) 226 fclose(queuef); 227 228 return (it); 229 } 230 231 int 232 linkspool(struct queue *queue) 233 { 234 struct stat st; 235 struct qitem *it; 236 237 if (fflush(queue->mailf) != 0 || fsync(fileno(queue->mailf)) != 0) 238 goto delfiles; 239 240 syslog(LOG_INFO, "new mail from user=%s uid=%d envelope_from=<%s>", 241 username, getuid(), queue->sender); 242 243 LIST_FOREACH(it, &queue->queue, next) { 244 if (asprintf(&it->queueid, "%s.%"PRIxPTR, queue->id, (uintptr_t)it) <= 0) 245 goto delfiles; 246 if (asprintf(&it->queuefn, "%s/Q%s", config.spooldir, it->queueid) <= 0) 247 goto delfiles; 248 if (asprintf(&it->mailfn, "%s/M%s", config.spooldir, it->queueid) <= 0) 249 goto delfiles; 250 251 /* Neither file may not exist yet */ 252 if (stat(it->queuefn, &st) == 0 || stat(it->mailfn, &st) == 0) 253 goto delfiles; 254 255 if (writequeuef(it) != 0) 256 goto delfiles; 257 258 if (link(queue->tmpf, it->mailfn) != 0) 259 goto delfiles; 260 } 261 262 LIST_FOREACH(it, &queue->queue, next) { 263 syslog(LOG_INFO, "mail to=<%s> queued as %s", 264 it->addr, it->queueid); 265 } 266 267 unlink(queue->tmpf); 268 return (0); 269 270 delfiles: 271 LIST_FOREACH(it, &queue->queue, next) { 272 unlink(it->mailfn); 273 unlink(it->queuefn); 274 } 275 return (-1); 276 } 277 278 int 279 load_queue(struct queue *queue) 280 { 281 struct stat sb; 282 struct qitem *it; 283 DIR *spooldir; 284 struct dirent *de; 285 char *queuefn; 286 char *mailfn; 287 288 bzero(queue, sizeof(*queue)); 289 LIST_INIT(&queue->queue); 290 291 spooldir = opendir(config.spooldir); 292 if (spooldir == NULL) 293 err(1, "reading queue"); 294 295 while ((de = readdir(spooldir)) != NULL) { 296 queuefn = NULL; 297 mailfn = NULL; 298 299 /* ignore non-queue files */ 300 if (de->d_name[0] != 'Q') 301 continue; 302 if (asprintf(&queuefn, "%s/Q%s", config.spooldir, de->d_name + 1) < 0) 303 goto fail; 304 if (asprintf(&mailfn, "%s/M%s", config.spooldir, de->d_name + 1) < 0) 305 goto fail; 306 307 /* 308 * Some file systems don't provide a de->d_type, so we have to 309 * do an explicit stat on the queue file. 310 * Move on if it turns out to be something else than a file. 311 */ 312 if (stat(queuefn, &sb) != 0) 313 goto skip_item; 314 if (!S_ISREG(sb.st_mode)) { 315 errno = EINVAL; 316 goto skip_item; 317 } 318 319 if (stat(mailfn, &sb) != 0) 320 goto skip_item; 321 322 it = readqueuef(queue, queuefn); 323 if (it == NULL) 324 goto skip_item; 325 326 it->mailfn = mailfn; 327 continue; 328 329 skip_item: 330 syslog(LOG_INFO, "could not pick up queue file: `%s'/`%s': %m", queuefn, mailfn); 331 if (queuefn != NULL) 332 free(queuefn); 333 if (mailfn != NULL) 334 free(mailfn); 335 } 336 closedir(spooldir); 337 return (0); 338 339 fail: 340 return (-1); 341 } 342 343 void 344 delqueue(struct qitem *it) 345 { 346 unlink(it->mailfn); 347 unlink(it->queuefn); 348 if (it->queuef != NULL) 349 fclose(it->queuef); 350 if (it->mailf != NULL) 351 fclose(it->mailf); 352 free(it); 353 } 354 355 int 356 acquirespool(struct qitem *it) 357 { 358 int queuefd; 359 360 if (it->queuef == NULL) { 361 queuefd = open_locked(it->queuefn, O_RDWR|O_NONBLOCK); 362 if (queuefd < 0) 363 goto fail; 364 it->queuef = fdopen(queuefd, "r+"); 365 if (it->queuef == NULL) 366 goto fail; 367 } 368 369 if (it->mailf == NULL) { 370 it->mailf = fopen(it->mailfn, "r"); 371 if (it->mailf == NULL) 372 goto fail; 373 } 374 375 return (0); 376 377 fail: 378 if (errno == EWOULDBLOCK) 379 return (1); 380 syslog(LOG_INFO, "could not acquire queue file: %m"); 381 return (-1); 382 } 383 384 void 385 dropspool(struct queue *queue, struct qitem *keep) 386 { 387 struct qitem *it; 388 389 LIST_FOREACH(it, &queue->queue, next) { 390 if (it == keep) 391 continue; 392 393 if (it->queuef != NULL) 394 fclose(it->queuef); 395 if (it->mailf != NULL) 396 fclose(it->mailf); 397 } 398 } 399 400 int 401 flushqueue_since(unsigned int period) 402 { 403 struct stat st; 404 struct timeval now; 405 char *flushfn = NULL; 406 407 if (asprintf(&flushfn, "%s/%s", config.spooldir, SPOOL_FLUSHFILE) < 0) 408 return (0); 409 if (stat(flushfn, &st) < 0) { 410 free(flushfn); 411 return (0); 412 } 413 free(flushfn); 414 flushfn = NULL; 415 if (gettimeofday(&now, 0) != 0) 416 return (0); 417 418 /* Did the flush file get touched within the last period seconds? */ 419 if (st.st_mtim.tv_sec + (int)period >= now.tv_sec) 420 return (1); 421 else 422 return (0); 423 } 424 425 int 426 flushqueue_signal(void) 427 { 428 char *flushfn = NULL; 429 int fd; 430 431 if (asprintf(&flushfn, "%s/%s", config.spooldir, SPOOL_FLUSHFILE) < 0) 432 return (-1); 433 fd = open(flushfn, O_CREAT|O_WRONLY|O_TRUNC, 0660); 434 free(flushfn); 435 if (fd < 0) { 436 syslog(LOG_ERR, "could not open flush file: %m"); 437 return (-1); 438 } 439 close(fd); 440 return (0); 441 } 442