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/* $OpenBSD: queue_fs.c,v 1.15 2017/10/10 05:03:52 guenther Exp $ */
/*
* Copyright (c) 2011 Gilles Chehade <gilles@poolp.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "includes.h"
#include <sys/types.h>
#if HAVE_SYS_MOUNT_H
#include <sys/mount.h>
#endif
#include <sys/queue.h>
#include <sys/tree.h>
#include <sys/socket.h>
#include <sys/stat.h>
#ifdef HAVE_SYS_STATFS_H
#include <sys/statfs.h>
#endif
#include <ctype.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <event.h>
#include <fcntl.h>
#include <fts.h>
#include <imsg.h>
#include <inttypes.h>
#include <libgen.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "smtpd.h"
#include "log.h"
#define PATH_QUEUE "/queue"
#define PATH_CORRUPT "/corrupt"
#define PATH_INCOMING "/incoming"
#define PATH_EVPTMP PATH_INCOMING "/envelope.tmp"
#define PATH_MESSAGE "/message"
/* percentage of remaining space / inodes required to accept new messages */
#define MINSPACE 5
#define MININODES 5
struct qwalk {
FTS *fts;
int depth;
};
static int fsqueue_check_space(void);
static void fsqueue_envelope_path(uint64_t, char *, size_t);
static void fsqueue_envelope_incoming_path(uint64_t, char *, size_t);
static int fsqueue_envelope_dump(char *, const char *, size_t, int, int);
static void fsqueue_message_path(uint32_t, char *, size_t);
static void fsqueue_message_corrupt_path(uint32_t, char *, size_t);
static void fsqueue_message_incoming_path(uint32_t, char *, size_t);
static void *fsqueue_qwalk_new(void);
static int fsqueue_qwalk(void *, uint64_t *);
static void fsqueue_qwalk_close(void *);
struct tree evpcount;
static struct timespec startup;
#define REF (int*)0xf00
static int
queue_fs_message_create(uint32_t *msgid)
{
char rootdir[PATH_MAX];
struct stat sb;
if (!fsqueue_check_space())
return 0;
again:
*msgid = queue_generate_msgid();
/* prevent possible collision later when moving to Q_QUEUE */
fsqueue_message_path(*msgid, rootdir, sizeof(rootdir));
if (stat(rootdir, &sb) != -1)
goto again;
/* we hit an unexpected error, temporarily fail */
if (errno != ENOENT) {
*msgid = 0;
return 0;
}
fsqueue_message_incoming_path(*msgid, rootdir, sizeof(rootdir));
if (mkdir(rootdir, 0700) == -1) {
if (errno == EEXIST)
goto again;
if (errno == ENOSPC) {
*msgid = 0;
return 0;
}
log_warn("warn: queue-fs: mkdir");
*msgid = 0;
return 0;
}
return (1);
}
static int
queue_fs_message_commit(uint32_t msgid, const char *path)
{
char incomingdir[PATH_MAX];
char queuedir[PATH_MAX];
char msgdir[PATH_MAX];
char msgpath[PATH_MAX];
/* before-first, move the message content in the incoming directory */
fsqueue_message_incoming_path(msgid, msgpath, sizeof(msgpath));
if (strlcat(msgpath, PATH_MESSAGE, sizeof(msgpath))
>= sizeof(msgpath))
return (0);
if (rename(path, msgpath) == -1)
return (0);
fsqueue_message_incoming_path(msgid, incomingdir, sizeof(incomingdir));
fsqueue_message_path(msgid, msgdir, sizeof(msgdir));
if (strlcpy(queuedir, msgdir, sizeof(queuedir))
>= sizeof(queuedir))
return (0);
/* first attempt to rename */
if (rename(incomingdir, msgdir) == 0)
return 1;
if (errno == ENOSPC)
return 0;
if (errno != ENOENT) {
log_warn("warn: queue-fs: rename");
return 0;
}
/* create the bucket */
*strrchr(queuedir, '/') = '\0';
if (mkdir(queuedir, 0700) == -1) {
if (errno == ENOSPC)
return 0;
if (errno != EEXIST) {
log_warn("warn: queue-fs: mkdir");
return 0;
}
}
/* rename */
if (rename(incomingdir, msgdir) == -1) {
if (errno == ENOSPC)
return 0;
log_warn("warn: queue-fs: rename");
return 0;
}
return 1;
}
static int
queue_fs_message_fd_r(uint32_t msgid)
{
int fd;
char path[PATH_MAX];
fsqueue_message_path(msgid, path, sizeof(path));
if (strlcat(path, PATH_MESSAGE, sizeof(path))
>= sizeof(path))
return -1;
if ((fd = open(path, O_RDONLY)) == -1) {
log_warn("warn: queue-fs: open");
return -1;
}
return fd;
}
static int
queue_fs_message_delete(uint32_t msgid)
{
char path[PATH_MAX];
struct stat sb;
fsqueue_message_incoming_path(msgid, path, sizeof(path));
if (stat(path, &sb) == -1)
fsqueue_message_path(msgid, path, sizeof(path));
if (rmtree(path, 0) == -1)
log_warn("warn: queue-fs: rmtree");
tree_pop(&evpcount, msgid);
return 1;
}
static int
queue_fs_message_corrupt(uint32_t msgid)
{
struct stat sb;
char rootdir[PATH_MAX];
char corruptdir[PATH_MAX];
char buf[64];
int retry = 0;
fsqueue_message_path(msgid, rootdir, sizeof(rootdir));
fsqueue_message_corrupt_path(msgid, corruptdir,
sizeof(corruptdir));
again:
if (stat(corruptdir, &sb) != -1 || errno != ENOENT) {
fsqueue_message_corrupt_path(msgid, corruptdir,
sizeof(corruptdir));
(void)snprintf(buf, sizeof (buf), ".%d", retry++);
(void)strlcat(corruptdir, buf, sizeof(corruptdir));
goto again;
}
if (rename(rootdir, corruptdir) == -1) {
log_warn("warn: queue-fs: rename");
return 0;
}
tree_pop(&evpcount, msgid);
return 1;
}
static int
queue_fs_message_uncorrupt(uint32_t msgid)
{
struct stat sb;
char bucketdir[PATH_MAX];
char queuedir[PATH_MAX];
char corruptdir[PATH_MAX];
fsqueue_message_corrupt_path(msgid, corruptdir, sizeof(corruptdir));
if (stat(corruptdir, &sb) == -1) {
log_warnx("warn: queue-fs: stat %s failed", corruptdir);
return (0);
}
fsqueue_message_path(msgid, queuedir, sizeof(queuedir));
if (stat(queuedir, &sb) == 0) {
log_warnx("warn: queue-fs: %s already exists", queuedir);
return (0);
}
if (!bsnprintf(bucketdir, sizeof bucketdir, "%s/%02x", PATH_QUEUE,
(msgid & 0xff000000) >> 24)) {
log_warnx("warn: queue-fs: path too long");
return (0);
}
/* create the bucket */
if (mkdir(bucketdir, 0700) == -1) {
if (errno == ENOSPC)
return (0);
if (errno != EEXIST) {
log_warn("warn: queue-fs: mkdir");
return (0);
}
}
if (rename(corruptdir, queuedir) == -1) {
log_warn("warn: queue-fs: rename");
return (0);
}
return (1);
}
static int
queue_fs_envelope_create(uint32_t msgid, const char *buf, size_t len,
uint64_t *evpid)
{
char path[PATH_MAX];
int queued = 0, i, r = 0, *n;
struct stat sb;
if (msgid == 0) {
log_warnx("warn: queue-fs: msgid=0, evpid=%016"PRIx64, *evpid);
goto done;
}
fsqueue_message_incoming_path(msgid, path, sizeof(path));
if (stat(path, &sb) == -1)
queued = 1;
for (i = 0; i < 20; i ++) {
*evpid = queue_generate_evpid(msgid);
if (queued)
fsqueue_envelope_path(*evpid, path, sizeof(path));
else
fsqueue_envelope_incoming_path(*evpid, path,
sizeof(path));
if ((r = fsqueue_envelope_dump(path, buf, len, 0, 0)) != 0)
goto done;
}
r = 0;
log_warnx("warn: queue-fs: could not allocate evpid");
done:
if (r) {
n = tree_pop(&evpcount, msgid);
if (n == NULL)
n = REF;
n += 1;
tree_xset(&evpcount, msgid, n);
}
return (r);
}
static int
queue_fs_envelope_load(uint64_t evpid, char *buf, size_t len)
{
char pathname[PATH_MAX];
FILE *fp;
size_t r;
fsqueue_envelope_path(evpid, pathname, sizeof(pathname));
fp = fopen(pathname, "r");
if (fp == NULL) {
if (errno != ENOENT && errno != ENFILE)
log_warn("warn: queue-fs: fopen");
return 0;
}
r = fread(buf, 1, len, fp);
if (r) {
if (r == len) {
log_warn("warn: queue-fs: too large");
r = 0;
}
else
buf[r] = '\0';
}
fclose(fp);
return (r);
}
static int
queue_fs_envelope_update(uint64_t evpid, const char *buf, size_t len)
{
char dest[PATH_MAX];
fsqueue_envelope_path(evpid, dest, sizeof(dest));
return (fsqueue_envelope_dump(dest, buf, len, 1, 1));
}
static int
queue_fs_envelope_delete(uint64_t evpid)
{
char pathname[PATH_MAX];
uint32_t msgid;
int *n;
fsqueue_envelope_path(evpid, pathname, sizeof(pathname));
if (unlink(pathname) == -1)
if (errno != ENOENT)
return 0;
msgid = evpid_to_msgid(evpid);
n = tree_pop(&evpcount, msgid);
n -= 1;
if (n - REF == 0)
queue_fs_message_delete(msgid);
else
tree_xset(&evpcount, msgid, n);
return (1);
}
static int
queue_fs_message_walk(uint64_t *evpid, char *buf, size_t len,
uint32_t msgid, int *done, void **data)
{
struct dirent *dp;
DIR *dir = *data;
char path[PATH_MAX];
char msgid_str[9];
char *tmp;
int r, *n;
if (*done)
return (-1);
if (!bsnprintf(path, sizeof path, "%s/%02x/%08x",
PATH_QUEUE, (msgid & 0xff000000) >> 24, msgid))
fatalx("queue_fs_message_walk: path does not fit buffer");
if (dir == NULL) {
if ((dir = opendir(path)) == NULL) {
log_warn("warn: queue_fs: opendir: %s", path);
*done = 1;
return (-1);
}
*data = dir;
}
(void)snprintf(msgid_str, sizeof msgid_str, "%08" PRIx32, msgid);
while ((dp = readdir(dir)) != NULL) {
#if defined(HAVE_STRUCT_DIR_D_TYPE)
if (dp->d_type != DT_REG)
continue;
#endif
/* ignore files other than envelopes */
if (strlen(dp->d_name) != 16 ||
strncmp(dp->d_name, msgid_str, 8))
continue;
tmp = NULL;
*evpid = strtoull(dp->d_name, &tmp, 16);
if (tmp && *tmp != '\0') {
log_debug("debug: fsqueue: bogus file %s", dp->d_name);
continue;
}
memset(buf, 0, len);
r = queue_fs_envelope_load(*evpid, buf, len);
if (r) {
n = tree_pop(&evpcount, msgid);
if (n == NULL)
n = REF;
n += 1;
tree_xset(&evpcount, msgid, n);
}
return (r);
}
(void)closedir(dir);
*done = 1;
return (-1);
}
static int
queue_fs_envelope_walk(uint64_t *evpid, char *buf, size_t len)
{
static int done = 0;
static void *hdl = NULL;
int r, *n;
uint32_t msgid;
if (done)
return (-1);
if (hdl == NULL)
hdl = fsqueue_qwalk_new();
if (fsqueue_qwalk(hdl, evpid)) {
memset(buf, 0, len);
r = queue_fs_envelope_load(*evpid, buf, len);
if (r) {
msgid = evpid_to_msgid(*evpid);
n = tree_pop(&evpcount, msgid);
if (n == NULL)
n = REF;
n += 1;
tree_xset(&evpcount, msgid, n);
}
return (r);
}
fsqueue_qwalk_close(hdl);
done = 1;
return (-1);
}
static int
fsqueue_check_space(void)
{
#ifdef __OpenBSD__
struct statfs buf;
uint64_t used;
uint64_t total;
if (statfs(PATH_QUEUE, &buf) < 0) {
log_warn("warn: queue-fs: statfs");
return 0;
}
/*
* f_bfree and f_ffree is not set on all filesystems.
* They could be signed or unsigned integers.
* Some systems will set them to 0, others will set them to -1.
*/
if (buf.f_bfree == 0 || buf.f_ffree == 0 ||
(int64_t)buf.f_bfree == -1 || (int64_t)buf.f_ffree == -1)
return 1;
used = buf.f_blocks - buf.f_bfree;
total = buf.f_bavail + used;
if (total != 0)
used = (float)used / (float)total * 100;
else
used = 100;
if (100 - used < MINSPACE) {
log_warnx("warn: not enough disk space: %llu%% left",
(unsigned long long) 100 - used);
log_warnx("warn: temporarily rejecting messages");
return 0;
}
used = buf.f_files - buf.f_ffree;
total = buf.f_favail + used;
if (total != 0)
used = (float)used / (float)total * 100;
else
used = 100;
if (100 - used < MININODES) {
log_warnx("warn: not enough inodes: %llu%% left",
(unsigned long long) 100 - used);
log_warnx("warn: temporarily rejecting messages");
return 0;
}
#endif
return 1;
}
static void
fsqueue_envelope_path(uint64_t evpid, char *buf, size_t len)
{
if (!bsnprintf(buf, len, "%s/%02x/%08x/%016" PRIx64,
PATH_QUEUE,
(evpid_to_msgid(evpid) & 0xff000000) >> 24,
evpid_to_msgid(evpid),
evpid))
fatalx("fsqueue_envelope_path: path does not fit buffer");
}
static void
fsqueue_envelope_incoming_path(uint64_t evpid, char *buf, size_t len)
{
if (!bsnprintf(buf, len, "%s/%08x/%016" PRIx64,
PATH_INCOMING,
evpid_to_msgid(evpid),
evpid))
fatalx("fsqueue_envelope_incoming_path: path does not fit buffer");
}
static int
fsqueue_envelope_dump(char *dest, const char *evpbuf, size_t evplen,
int do_atomic, int do_sync)
{
const char *path = do_atomic ? PATH_EVPTMP : dest;
FILE *fp = NULL;
int fd;
size_t w;
if ((fd = open(path, O_RDWR | O_CREAT | O_EXCL, 0600)) == -1) {
log_warn("warn: queue-fs: open");
goto tempfail;
}
if ((fp = fdopen(fd, "w")) == NULL) {
log_warn("warn: queue-fs: fdopen");
goto tempfail;
}
w = fwrite(evpbuf, 1, evplen, fp);
if (w < evplen) {
log_warn("warn: queue-fs: short write");
goto tempfail;
}
if (fflush(fp)) {
log_warn("warn: queue-fs: fflush");
goto tempfail;
}
if (do_sync && fsync(fileno(fp))) {
log_warn("warn: queue-fs: fsync");
goto tempfail;
}
if (fclose(fp) != 0) {
log_warn("warn: queue-fs: fclose");
fp = NULL;
goto tempfail;
}
fp = NULL;
fd = -1;
if (do_atomic && rename(path, dest) == -1) {
log_warn("warn: queue-fs: rename");
goto tempfail;
}
return (1);
tempfail:
if (fp)
fclose(fp);
else if (fd != -1)
close(fd);
if (unlink(path) == -1)
log_warn("warn: queue-fs: unlink");
return (0);
}
static void
fsqueue_message_path(uint32_t msgid, char *buf, size_t len)
{
if (!bsnprintf(buf, len, "%s/%02x/%08x",
PATH_QUEUE,
(msgid & 0xff000000) >> 24,
msgid))
fatalx("fsqueue_message_path: path does not fit buffer");
}
static void
fsqueue_message_corrupt_path(uint32_t msgid, char *buf, size_t len)
{
if (!bsnprintf(buf, len, "%s/%08x",
PATH_CORRUPT,
msgid))
fatalx("fsqueue_message_corrupt_path: path does not fit buffer");
}
static void
fsqueue_message_incoming_path(uint32_t msgid, char *buf, size_t len)
{
if (!bsnprintf(buf, len, "%s/%08x",
PATH_INCOMING,
msgid))
fatalx("fsqueue_message_incoming_path: path does not fit buffer");
}
static void *
fsqueue_qwalk_new(void)
{
char path[PATH_MAX];
char * const path_argv[] = { path, NULL };
struct qwalk *q;
q = xcalloc(1, sizeof(*q), "fsqueue_qwalk_new");
(void)strlcpy(path, PATH_QUEUE, sizeof(path));
q->fts = fts_open(path_argv,
FTS_PHYSICAL | FTS_NOCHDIR, NULL);
if (q->fts == NULL)
err(1, "fsqueue_qwalk_new: fts_open: %s", path);
return (q);
}
static void
fsqueue_qwalk_close(void *hdl)
{
struct qwalk *q = hdl;
fts_close(q->fts);
free(q);
}
static int
fsqueue_qwalk(void *hdl, uint64_t *evpid)
{
struct qwalk *q = hdl;
FTSENT *e;
char *tmp;
while ((e = fts_read(q->fts)) != NULL) {
switch (e->fts_info) {
case FTS_D:
q->depth += 1;
if (q->depth == 2 && e->fts_namelen != 2) {
log_debug("debug: fsqueue: bogus directory %s",
e->fts_path);
fts_set(q->fts, e, FTS_SKIP);
break;
}
if (q->depth == 3 && e->fts_namelen != 8) {
log_debug("debug: fsqueue: bogus directory %s",
e->fts_path);
fts_set(q->fts, e, FTS_SKIP);
break;
}
break;
case FTS_DP:
case FTS_DNR:
q->depth -= 1;
break;
case FTS_F:
if (q->depth != 3)
break;
if (e->fts_namelen != 16)
break;
#if HAVE_STRUCT_STAT_ST_MTIM
if (timespeccmp(&e->fts_statp->st_mtim, &startup, >))
#endif
#if HAVE_STRUCT_STAT_ST_MTIMSPEC
if (timespeccmp(&e->fts_statp->st_mtimspec, &startup, >))
#endif
break;
tmp = NULL;
*evpid = strtoull(e->fts_name, &tmp, 16);
if (tmp && *tmp != '\0') {
log_debug("debug: fsqueue: bogus file %s",
e->fts_path);
break;
}
return (1);
default:
break;
}
}
return (0);
}
static int
queue_fs_init(struct passwd *pw, int server, const char *conf)
{
unsigned int n;
char *paths[] = { PATH_QUEUE, PATH_CORRUPT, PATH_INCOMING };
char path[PATH_MAX];
int ret;
/* remove incoming/ if it exists */
if (server)
mvpurge(PATH_SPOOL PATH_INCOMING, PATH_SPOOL PATH_PURGE);
fsqueue_envelope_path(0, path, sizeof(path));
ret = 1;
for (n = 0; n < nitems(paths); n++) {
(void)strlcpy(path, PATH_SPOOL, sizeof(path));
if (strlcat(path, paths[n], sizeof(path)) >= sizeof(path))
errx(1, "path too long %s%s", PATH_SPOOL, paths[n]);
if (ckdir(path, 0700, pw->pw_uid, 0, server) == 0)
ret = 0;
}
if (clock_gettime(CLOCK_REALTIME, &startup))
err(1, "clock_gettime");
tree_init(&evpcount);
queue_api_on_message_create(queue_fs_message_create);
queue_api_on_message_commit(queue_fs_message_commit);
queue_api_on_message_delete(queue_fs_message_delete);
queue_api_on_message_fd_r(queue_fs_message_fd_r);
queue_api_on_message_corrupt(queue_fs_message_corrupt);
queue_api_on_message_uncorrupt(queue_fs_message_uncorrupt);
queue_api_on_envelope_create(queue_fs_envelope_create);
queue_api_on_envelope_delete(queue_fs_envelope_delete);
queue_api_on_envelope_update(queue_fs_envelope_update);
queue_api_on_envelope_load(queue_fs_envelope_load);
queue_api_on_envelope_walk(queue_fs_envelope_walk);
queue_api_on_message_walk(queue_fs_message_walk);
return (ret);
}
struct queue_backend queue_backend_fs = {
queue_fs_init,
};
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