/* * Copyright (c) 2008-2014, Simon Schubert <2@0x2c.org>. * Copyright (c) 2008 The DragonFly Project. All rights reserved. * * This code is derived from software contributed to The DragonFly Project * by Simon Schubert <2@0x2c.org>. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name of The DragonFly Project nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific, prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include "dfcompat.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include "dma.h" /* * Spool file format: * * 'Q'id files (queue): * Organized like an RFC822 header, field: value. Ignores unknown fields. * ID: id * Sender: envelope-from * Recipient: envelope-to * * 'M'id files (data): * mail data * * Each queue file needs to have a corresponding data file. * One data file might be shared by linking it several times. * * Queue ids are unique, formed from the inode of the data file * and a unique identifier. */ int newspoolf(struct queue *queue) { char fn[PATH_MAX+1]; struct stat st; struct stritem *t; int fd; if (snprintf(fn, sizeof(fn), "%s/%s", config.spooldir, "tmp_XXXXXXXXXX") <= 0) return (-1); fd = mkstemp(fn); if (fd < 0) return (-1); /* XXX group rights */ if (fchmod(fd, 0660) < 0) goto fail; if (flock(fd, LOCK_EX) == -1) goto fail; queue->tmpf = strdup(fn); if (queue->tmpf == NULL) goto fail; /* * Assign queue id */ if (fstat(fd, &st) != 0) goto fail; if (asprintf(&queue->id, "%"PRIxMAX, (uintmax_t)st.st_ino) < 0) goto fail; queue->mailf = fdopen(fd, "r+"); if (queue->mailf == NULL) goto fail; t = malloc(sizeof(*t)); if (t != NULL) { t->str = queue->tmpf; SLIST_INSERT_HEAD(&tmpfs, t, next); } return (0); fail: if (queue->mailf != NULL) fclose(queue->mailf); close(fd); unlink(fn); return (-1); } static int writequeuef(struct qitem *it) { int error; int queuefd; queuefd = open_locked(it->queuefn, O_CREAT|O_EXCL|O_RDWR, 0660); if (queuefd == -1) return (-1); if (fchmod(queuefd, 0660) < 0) return (-1); it->queuef = fdopen(queuefd, "w+"); if (it->queuef == NULL) return (-1); error = fprintf(it->queuef, "ID: %s\n" "Sender: %s\n" "Recipient: %s\n", it->queueid, it->sender, it->addr); if (error <= 0) return (-1); if (fflush(it->queuef) != 0 || fsync(fileno(it->queuef)) != 0) return (-1); return (0); } static struct qitem * readqueuef(struct queue *queue, char *queuefn) { char line[1000]; struct queue itmqueue; FILE *queuef = NULL; char *s; char *queueid = NULL, *sender = NULL, *addr = NULL; struct qitem *it = NULL; bzero(&itmqueue, sizeof(itmqueue)); LIST_INIT(&itmqueue.queue); queuef = fopen(queuefn, "r"); if (queuef == NULL) goto out; while (!feof(queuef)) { if (fgets(line, sizeof(line), queuef) == NULL || line[0] == 0) break; line[strlen(line) - 1] = 0; /* chop newline */ s = strchr(line, ':'); if (s == NULL) goto malformed; *s = 0; s++; while (isspace(*s)) s++; s = strdup(s); if (s == NULL) goto malformed; if (strcmp(line, "ID") == 0) { queueid = s; } else if (strcmp(line, "Sender") == 0) { sender = s; } else if (strcmp(line, "Recipient") == 0) { addr = s; } else { syslog(LOG_DEBUG, "ignoring unknown queue info `%s' in `%s'", line, queuefn); free(s); } } if (queueid == NULL || sender == NULL || addr == NULL || *queueid == 0 || *addr == 0) { malformed: errno = EINVAL; syslog(LOG_ERR, "malformed queue file `%s'", queuefn); goto out; } if (add_recp(&itmqueue, addr, 0) != 0) goto out; it = LIST_FIRST(&itmqueue.queue); it->sender = sender; sender = NULL; it->queueid = queueid; queueid = NULL; it->queuefn = queuefn; queuefn = NULL; LIST_INSERT_HEAD(&queue->queue, it, next); out: if (sender != NULL) free(sender); if (queueid != NULL) free(queueid); if (addr != NULL) free(addr); if (queuef != NULL) fclose(queuef); return (it); } int linkspool(struct queue *queue) { struct stat st; struct qitem *it; if (fflush(queue->mailf) != 0 || fsync(fileno(queue->mailf)) != 0) goto delfiles; syslog(LOG_INFO, "new mail from user=%s uid=%d envelope_from=<%s>", username, getuid(), queue->sender); LIST_FOREACH(it, &queue->queue, next) { if (asprintf(&it->queueid, "%s.%"PRIxPTR, queue->id, (uintptr_t)it) <= 0) goto delfiles; if (asprintf(&it->queuefn, "%s/Q%s", config.spooldir, it->queueid) <= 0) goto delfiles; if (asprintf(&it->mailfn, "%s/M%s", config.spooldir, it->queueid) <= 0) goto delfiles; /* Neither file may not exist yet */ if (stat(it->queuefn, &st) == 0 || stat(it->mailfn, &st) == 0) goto delfiles; if (writequeuef(it) != 0) goto delfiles; if (link(queue->tmpf, it->mailfn) != 0) goto delfiles; } LIST_FOREACH(it, &queue->queue, next) { syslog(LOG_INFO, "mail to=<%s> queued as %s", it->addr, it->queueid); } unlink(queue->tmpf); return (0); delfiles: LIST_FOREACH(it, &queue->queue, next) { unlink(it->mailfn); unlink(it->queuefn); } return (-1); } int load_queue(struct queue *queue) { struct stat sb; struct qitem *it; DIR *spooldir; struct dirent *de; char *queuefn; char *mailfn; bzero(queue, sizeof(*queue)); LIST_INIT(&queue->queue); spooldir = opendir(config.spooldir); if (spooldir == NULL) err(EX_NOINPUT, "reading queue"); while ((de = readdir(spooldir)) != NULL) { queuefn = NULL; mailfn = NULL; /* ignore non-queue files */ if (de->d_name[0] != 'Q') continue; if (asprintf(&queuefn, "%s/Q%s", config.spooldir, de->d_name + 1) < 0) goto fail; if (asprintf(&mailfn, "%s/M%s", config.spooldir, de->d_name + 1) < 0) goto fail; /* * Some file systems don't provide a de->d_type, so we have to * do an explicit stat on the queue file. * Move on if it turns out to be something else than a file. */ if (stat(queuefn, &sb) != 0) goto skip_item; if (!S_ISREG(sb.st_mode)) { errno = EINVAL; goto skip_item; } if (stat(mailfn, &sb) != 0) goto skip_item; it = readqueuef(queue, queuefn); if (it == NULL) goto skip_item; it->mailfn = mailfn; continue; skip_item: syslog(LOG_INFO, "could not pick up queue file: `%s'/`%s': %m", queuefn, mailfn); if (queuefn != NULL) free(queuefn); if (mailfn != NULL) free(mailfn); } closedir(spooldir); return (0); fail: return (-1); } void delqueue(struct qitem *it) { unlink(it->mailfn); unlink(it->queuefn); if (it->queuef != NULL) fclose(it->queuef); if (it->mailf != NULL) fclose(it->mailf); free(it); } int acquirespool(struct qitem *it) { int queuefd; if (it->queuef == NULL) { queuefd = open_locked(it->queuefn, O_RDWR|O_NONBLOCK); if (queuefd < 0) goto fail; it->queuef = fdopen(queuefd, "r+"); if (it->queuef == NULL) goto fail; } if (it->mailf == NULL) { it->mailf = fopen(it->mailfn, "r"); if (it->mailf == NULL) goto fail; } return (0); fail: if (errno == EWOULDBLOCK) return (1); syslog(LOG_INFO, "could not acquire queue file: %m"); return (-1); } void dropspool(struct queue *queue, struct qitem *keep) { struct qitem *it; LIST_FOREACH(it, &queue->queue, next) { if (it == keep) continue; if (it->queuef != NULL) fclose(it->queuef); if (it->mailf != NULL) fclose(it->mailf); } } int flushqueue_since(unsigned int period) { struct stat st; struct timeval now; char *flushfn = NULL; if (asprintf(&flushfn, "%s/%s", config.spooldir, SPOOL_FLUSHFILE) < 0) return (0); if (stat(flushfn, &st) < 0) { free(flushfn); return (0); } free(flushfn); flushfn = NULL; if (gettimeofday(&now, 0) != 0) return (0); /* Did the flush file get touched within the last period seconds? */ if (st.st_mtim.tv_sec + period >= now.tv_sec) return (1); else return (0); } int flushqueue_signal(void) { char *flushfn = NULL; int fd; if (asprintf(&flushfn, "%s/%s", config.spooldir, SPOOL_FLUSHFILE) < 0) return (-1); fd = open(flushfn, O_CREAT|O_WRONLY|O_TRUNC, 0660); free(flushfn); if (fd < 0) { syslog(LOG_ERR, "could not open flush file: %m"); return (-1); } close(fd); return (0); }