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|
/* $OpenBSD: queue_fsqueue.c,v 1.39 2012/03/07 22:54:49 gilles Exp $ */
/*
* Copyright (c) 2011 Gilles Chehade <gilles@openbsd.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 <sys/types.h>
#include <sys/queue.h>
#include <sys/tree.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <ctype.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <event.h>
#include <fcntl.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"
static char *fsqueue_getpath(enum queue_kind);
static int fsqueue_envelope_load(enum queue_kind, struct envelope *);
static int fsqueue_envelope_update(enum queue_kind, struct envelope *);
static int fsqueue_envelope_delete(enum queue_kind, struct envelope *);
static int fsqueue_message_create(enum queue_kind, u_int32_t *);
static int fsqueue_message_commit(enum queue_kind, u_int32_t);
static int fsqueue_message_fd_r(enum queue_kind, u_int32_t);
static int fsqueue_message_fd_rw(enum queue_kind, u_int32_t);
static int fsqueue_message_delete(enum queue_kind, u_int32_t);
static int fsqueue_message_corrupt(enum queue_kind, u_int32_t);
static int fsqueue_message_path(enum queue_kind, uint32_t, char *, size_t);
static int fsqueue_envelope_path(enum queue_kind, u_int64_t, char *, size_t);
static int fsqueue_envelope_dump_atomic(char *, struct envelope *);
int fsqueue_init(int);
int fsqueue_message(enum queue_kind, enum queue_op, u_int32_t *);
int fsqueue_envelope(enum queue_kind, enum queue_op , struct envelope *);
int fsqueue_load_envelope_ascii(FILE *, struct envelope *);
int fsqueue_dump_envelope_ascii(FILE *, struct envelope *);
void *fsqueue_qwalk_new(enum queue_kind, u_int32_t);
int fsqueue_qwalk(void *, u_int64_t *);
void fsqueue_qwalk_close(void *);
#define PATH_INCOMING "/incoming"
#define PATH_QUEUE "/queue"
#define PATH_CORRUPT "/corrupt"
#define PATH_MESSAGE "/message"
#define PATH_ENVELOPES "/envelopes"
#define PATH_EVPTMP PATH_INCOMING "/envelope.tmp"
struct queue_backend queue_backend_fs = {
fsqueue_init,
fsqueue_message,
fsqueue_envelope,
fsqueue_qwalk_new,
fsqueue_qwalk,
fsqueue_qwalk_close
};
static char *
fsqueue_getpath(enum queue_kind kind)
{
switch (kind) {
case Q_INCOMING:
return (PATH_INCOMING);
case Q_QUEUE:
return (PATH_QUEUE);
case Q_CORRUPT:
return (PATH_CORRUPT);
default:
fatalx("queue_fsqueue_getpath: unsupported queue kind.");
}
return NULL;
}
static int
fsqueue_message_path(enum queue_kind qkind, uint32_t msgid, char *buf, size_t len)
{
if (qkind == Q_QUEUE)
return bsnprintf(buf, len, "%s/%03x/%08x",
fsqueue_getpath(qkind),
msgid & 0xfff,
msgid);
else
return bsnprintf(buf, len, "%s/%08x",
fsqueue_getpath(qkind),
msgid);
}
static int
fsqueue_envelope_path(enum queue_kind qkind, uint64_t evpid, char *buf, size_t len)
{
if (qkind == Q_QUEUE)
return bsnprintf(buf, len, "%s/%03x/%08x%s/%016" PRIx64,
fsqueue_getpath(qkind),
evpid_to_msgid(evpid) & 0xfff,
evpid_to_msgid(evpid),
PATH_ENVELOPES, evpid);
else
return bsnprintf(buf, len, "%s/%08x%s/%016" PRIx64,
fsqueue_getpath(qkind),
evpid_to_msgid(evpid),
PATH_ENVELOPES, evpid);
}
static int
fsqueue_envelope_dump_atomic(char *dest, struct envelope *ep)
{
FILE *fp;
char buf[MAXPATHLEN];
/* temporary fix for multi-process access to the queue,
* should be fixed by rerouting ALL queue access through
* the queue process.
*/
snprintf(buf, sizeof buf, PATH_EVPTMP".%d", getpid());
fp = fopen(buf, "w");
if (fp == NULL) {
if (errno == ENOSPC || errno == ENFILE)
goto tempfail;
fatal("fsqueue_envelope_dump_atomic: open");
}
if (! fsqueue_dump_envelope_ascii(fp, ep)) {
if (errno == ENOSPC)
goto tempfail;
fatal("fsqueue_envelope_dump_atomic: fwrite");
}
if (! safe_fclose(fp))
goto tempfail;
fp = NULL;
if (rename(buf, dest) == -1) {
if (errno == ENOSPC)
goto tempfail;
fatal("fsqueue_envelope_dump_atomic: rename");
}
return 1;
tempfail:
if (fp)
fclose(fp);
if (unlink(buf) == -1)
fatal("fsqueue_envelope_dump_atomic: unlink");
return 0;
}
static int
fsqueue_envelope_create(enum queue_kind qkind, struct envelope *ep)
{
char evpname[MAXPATHLEN];
u_int64_t evpid;
struct stat sb;
int r;
again:
evpid = queue_generate_evpid(evpid_to_msgid(ep->id));
fsqueue_envelope_path(qkind, evpid, evpname, sizeof(evpname));
if (stat(evpname, &sb) != -1 || errno != ENOENT)
goto again;
ep->creation = time(NULL);
ep->id = evpid;
if ((r = fsqueue_envelope_dump_atomic(evpname, ep)) == 0) {
ep->creation = 0;
ep->id = 0;
}
return (r);
}
static int
fsqueue_envelope_load(enum queue_kind qkind, struct envelope *ep)
{
char pathname[MAXPATHLEN];
FILE *fp;
int ret;
fsqueue_envelope_path(qkind, ep->id, pathname, sizeof(pathname));
fp = fopen(pathname, "r");
if (fp == NULL) {
if (errno == ENOENT || errno == ENFILE)
return 0;
fatal("fsqueue_envelope_load: fopen");
}
ret = fsqueue_load_envelope_ascii(fp, ep);
fclose(fp);
return ret;
}
static int
fsqueue_envelope_update(enum queue_kind qkind, struct envelope *ep)
{
char dest[MAXPATHLEN];
fsqueue_envelope_path(qkind, ep->id, dest, sizeof(dest));
return (fsqueue_envelope_dump_atomic(dest, ep));
}
static int
fsqueue_envelope_delete(enum queue_kind qkind, struct envelope *ep)
{
char pathname[MAXPATHLEN];
log_debug("#### %s: queue_envelope_delete: %016" PRIx64,
__func__, ep->id);
fsqueue_envelope_path(qkind, ep->id, pathname, sizeof(pathname));
if (unlink(pathname) == -1) {
log_debug("######: %s [errno: %d]", pathname, errno);
fatal("fsqueue_envelope_delete: unlink");
}
*strrchr(pathname, '/') = '\0';
if (rmdir(pathname) != -1)
fsqueue_message_delete(qkind, evpid_to_msgid(ep->id));
return 1;
}
static int
fsqueue_message_create(enum queue_kind qkind, u_int32_t *msgid)
{
char rootdir[MAXPATHLEN];
char evpdir[MAXPATHLEN];
struct stat sb;
again:
*msgid = queue_generate_msgid();
/* prevent possible collision later when moving to Q_QUEUE */
fsqueue_message_path(Q_QUEUE, *msgid, rootdir, sizeof(rootdir));
if (stat(rootdir, &sb) != -1 || errno != ENOENT)
goto again;
fsqueue_message_path(qkind, *msgid, rootdir, sizeof(rootdir));
if (mkdir(rootdir, 0700) == -1) {
if (errno == EEXIST)
goto again;
if (errno == ENOSPC) {
*msgid = 0;
return 0;
}
fatal("fsqueue_message_create: mkdir");
}
strlcpy(evpdir, rootdir, sizeof(evpdir));
strlcat(evpdir, PATH_ENVELOPES, sizeof(evpdir));
if (mkdir(evpdir, 0700) == -1) {
if (errno == ENOSPC) {
rmdir(rootdir);
*msgid = 0;
return 0;
}
fatal("fsqueue_message_create: mkdir");
}
return 1;
}
static int
fsqueue_message_commit(enum queue_kind qkind, u_int32_t msgid)
{
char rootdir[MAXPATHLEN];
char queuedir[MAXPATHLEN];
char msgdir[MAXPATHLEN];
fsqueue_message_path(qkind, msgid, rootdir, sizeof(rootdir));
fsqueue_message_path(Q_QUEUE, msgid, msgdir, sizeof(msgdir));
strlcpy(queuedir, msgdir, sizeof(queuedir));
*strrchr(queuedir, '/') = '\0';
if (mkdir(queuedir, 0700) == -1) {
if (errno == ENOSPC)
return 0;
if (errno != EEXIST)
fatal("fsqueue_message_commit: mkdir");
}
if (rename(rootdir, msgdir) == -1) {
if (errno == ENOSPC)
return 0;
fatal("fsqueue_message_commit: rename");
}
return 1;
}
static int
fsqueue_message_fd_r(enum queue_kind qkind, u_int32_t msgid)
{
int fd;
char path[MAXPATHLEN];
fsqueue_message_path(qkind, msgid, path, sizeof(path));
strlcat(path, PATH_MESSAGE, sizeof(path));
if ((fd = open(path, O_RDONLY)) == -1)
fatal("fsqueue_message_fd_r: open");
return fd;
}
static int
fsqueue_message_fd_rw(enum queue_kind qkind, u_int32_t msgid)
{
char path[MAXPATHLEN];
fsqueue_message_path(qkind, msgid, path, sizeof(path));
strlcat(path, PATH_MESSAGE, sizeof(path));
return open(path, O_CREAT|O_EXCL|O_RDWR, 0600);
}
static int
fsqueue_message_delete(enum queue_kind qkind, u_int32_t msgid)
{
char rootdir[MAXPATHLEN];
fsqueue_message_path(qkind, msgid, rootdir, sizeof(rootdir));
if (rmtree(rootdir, 0) == -1)
fatal("fsqueue_message_delete: rmtree");
return 1;
}
static int
fsqueue_message_corrupt(enum queue_kind qkind, u_int32_t msgid)
{
struct stat sb;
char rootdir[MAXPATHLEN];
char corruptdir[MAXPATHLEN];
char buf[64];
int retry = 0;
fsqueue_message_path(qkind, msgid, rootdir, sizeof(rootdir));
fsqueue_message_path(Q_CORRUPT, msgid, corruptdir, sizeof(corruptdir));
again:
if (stat(corruptdir, &sb) != -1 || errno != ENOENT) {
fsqueue_message_path(Q_CORRUPT, msgid, corruptdir, sizeof(corruptdir));
snprintf(buf, sizeof(buf), ".%i", retry++);
strlcat(corruptdir, buf, sizeof(corruptdir));
goto again;
}
if (rename(rootdir, corruptdir) == -1)
fatalx("fsqueue_message_corrupt: rename");
return 1;
}
int
fsqueue_init(int server)
{
unsigned int n;
char *paths[] = { PATH_INCOMING, PATH_QUEUE, PATH_CORRUPT };
char path[MAXPATHLEN];
int ret;
if (!fsqueue_envelope_path(Q_QUEUE, 0, path, sizeof(path)))
errx(1, "cannot store envelope path in %s", PATH_QUEUE);
if (!fsqueue_envelope_path(Q_INCOMING, 0, path, sizeof(path)))
errx(1, "cannot store envelope path in %s", PATH_INCOMING);
if (server)
mvpurge(PATH_SPOOL PATH_INCOMING, PATH_SPOOL PATH_PURGE);
ret = 1;
for (n = 0; n < nitems(paths); n++) {
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, env->sc_pw->pw_uid, 0, server) == 0)
ret = 0;
}
return ret;
}
int
fsqueue_message(enum queue_kind qkind, enum queue_op qop, u_int32_t *msgid)
{
switch (qop) {
case QOP_CREATE:
return fsqueue_message_create(qkind, msgid);
case QOP_DELETE:
return fsqueue_message_delete(qkind, *msgid);
case QOP_COMMIT:
return fsqueue_message_commit(qkind, *msgid);
case QOP_FD_R:
return fsqueue_message_fd_r(qkind, *msgid);
case QOP_FD_RW:
return fsqueue_message_fd_rw(qkind, *msgid);
case QOP_CORRUPT:
return fsqueue_message_corrupt(qkind, *msgid);
default:
fatalx("queue_fsqueue_message: unsupported operation.");
}
return 0;
}
int
fsqueue_envelope(enum queue_kind qkind, enum queue_op qop, struct envelope *m)
{
switch (qop) {
case QOP_CREATE:
return fsqueue_envelope_create(qkind, m);
case QOP_DELETE:
return fsqueue_envelope_delete(qkind, m);
case QOP_LOAD:
return fsqueue_envelope_load(qkind, m);
case QOP_UPDATE:
return fsqueue_envelope_update(qkind, m);
default:
fatalx("queue_fsqueue_envelope: unsupported operation.");
}
return 0;
}
#define QWALK_AGAIN 0x1
#define QWALK_RECURSE 0x2
#define QWALK_RETURN 0x3
struct qwalk {
enum queue_kind kind;
char path[MAXPATHLEN];
DIR *dirs[3];
int (*filefn)(struct qwalk *, char *);
int bucket;
int level;
u_int32_t msgid;
};
int walk_simple(struct qwalk *, char *);
int walk_queue(struct qwalk *, char *);
int walk_queue_nobucket(struct qwalk *, char *);
void *
fsqueue_qwalk_new(enum queue_kind kind, u_int32_t msgid)
{
struct qwalk *q;
q = calloc(1, sizeof(struct qwalk));
if (q == NULL)
fatal("qwalk_new: calloc");
strlcpy(q->path, fsqueue_getpath(kind),
sizeof(q->path));
q->kind = kind;
q->level = 0;
q->filefn = walk_simple;
q->msgid = msgid;
if (q->msgid) {
/* force level and bucket */
q->bucket = q->msgid & 0xfff;
q->level = 2;
if (! bsnprintf(q->path, sizeof(q->path), "%s/%03x/%08x/%s",
PATH_QUEUE, q->bucket, q->msgid, PATH_ENVELOPES))
fatalx("walk_queue: snprintf");
}
if (kind == Q_QUEUE)
q->filefn = walk_queue;
if (kind == Q_INCOMING)
q->filefn = walk_queue_nobucket;
q->dirs[q->level] = opendir(q->path);
if (q->dirs[q->level] == NULL)
fatal("qwalk_new: opendir");
return (q);
}
int
fsqueue_qwalk(void *hdl, u_int64_t *evpid)
{
struct qwalk *q = hdl;
struct dirent *dp;
again:
errno = 0;
dp = readdir(q->dirs[q->level]);
if (errno)
fatal("qwalk: readdir");
if (dp == NULL) {
closedir(q->dirs[q->level]);
q->dirs[q->level] = NULL;
if (q->level == 0 || q->msgid)
return (0);
q->level--;
goto again;
}
if (strcmp(dp->d_name, ".") == 0 || strcmp(dp->d_name, "..") == 0)
goto again;
switch (q->filefn(q, dp->d_name)) {
case QWALK_AGAIN:
goto again;
case QWALK_RECURSE:
goto recurse;
case QWALK_RETURN: {
char *endptr;
errno = 0;
*evpid = (u_int64_t)strtoull(dp->d_name, &endptr, 16);
if (q->path[0] == '\0' || *endptr != '\0')
goto again;
if (errno == ERANGE && *evpid == ULLONG_MAX)
goto again;
if (q->msgid)
if (evpid_to_msgid(*evpid) != q->msgid)
return 0;
return (1);
}
default:
fatalx("qwalk: callback failed");
}
recurse:
q->level++;
q->dirs[q->level] = opendir(q->path);
if (q->dirs[q->level] == NULL) {
if (errno == ENOENT) {
q->level--;
goto again;
}
fatal("qwalk: opendir");
}
goto again;
}
void
fsqueue_qwalk_close(void *hdl)
{
int i;
struct qwalk *q = hdl;
for (i = 0; i <= q->level; i++)
if (q->dirs[i])
closedir(q->dirs[i]);
bzero(q, sizeof(struct qwalk));
free(q);
}
int
walk_simple(struct qwalk *q, char *fname)
{
return (QWALK_RETURN);
}
int
walk_queue(struct qwalk *q, char *fname)
{
char *ep;
switch (q->level) {
case 0:
q->bucket = strtoul(fname, &ep, 16);
if (fname[0] == '\0' || *ep != '\0') {
log_warnx("walk_queue: invalid bucket: %s", fname);
return (QWALK_AGAIN);
}
if (errno == ERANGE || q->bucket >= DIRHASH_BUCKETS) {
log_warnx("walk_queue: invalid bucket: %s", fname);
return (QWALK_AGAIN);
}
if (! bsnprintf(q->path, sizeof(q->path), "%s/%03x",
fsqueue_getpath(q->kind), q->bucket & 0xfff))
fatalx("walk_queue: snprintf");
return (QWALK_RECURSE);
case 1:
if (! bsnprintf(q->path, sizeof(q->path), "%s/%03x/%s%s",
fsqueue_getpath(q->kind), q->bucket & 0xfff, fname,
PATH_ENVELOPES))
fatalx("walk_queue: snprintf");
return (QWALK_RECURSE);
case 2:
return (QWALK_RETURN);
}
return (-1);
}
int
walk_queue_nobucket(struct qwalk *q, char *fname)
{
switch (q->level) {
case 0:
if (! bsnprintf(q->path, sizeof(q->path), "%s/%s%s",
fsqueue_getpath(q->kind), fname, PATH_ENVELOPES))
fatalx("walk_queue_nobucket: snprintf");
return (QWALK_RECURSE);
case 1:
return (QWALK_RETURN);
}
return (-1);
}
int
fsqueue_load_envelope_ascii(FILE *fp, struct envelope *ep)
{
char *buf, *lbuf;
char *field;
size_t len;
enum envelope_field fields[] = {
EVP_VERSION,
EVP_ID,
EVP_HOSTNAME,
EVP_SOCKADDR,
EVP_HELO,
EVP_SENDER,
EVP_RCPT,
EVP_DEST,
EVP_TYPE,
EVP_CTIME,
EVP_EXPIRE,
EVP_RETRY,
EVP_LASTTRY,
EVP_FLAGS,
EVP_ERRORLINE,
EVP_MDA_METHOD,
EVP_MDA_BUFFER,
EVP_MDA_USER,
EVP_MTA_RELAY_HOST,
EVP_MTA_RELAY_PORT,
EVP_MTA_RELAY_CERT,
EVP_MTA_RELAY_FLAGS,
EVP_MTA_RELAY_AUTHMAP
};
int i;
int n;
int ret;
n = sizeof(fields) / sizeof(enum envelope_field);
bzero(ep, sizeof (*ep));
lbuf = NULL;
while ((buf = fgetln(fp, &len))) {
if (buf[len - 1] == '\n')
buf[len - 1] = '\0';
else {
if ((lbuf = malloc(len + 1)) == NULL)
err(1, NULL);
memcpy(lbuf, buf, len);
lbuf[len] = '\0';
buf = lbuf;
}
for (i = 0; i < n; ++i) {
field = envelope_ascii_field_name(fields[i]);
len = strlen(field);
if (! strncasecmp(field, buf, len)) {
/* skip kw and tailing whitespaces */
buf += len;
while (*buf && isspace(*buf))
buf++;
/* we *want* ':' */
if (*buf != ':')
continue;
buf++;
/* skip whitespaces after separator */
while (*buf && isspace(*buf))
buf++;
ret = envelope_ascii_load(fields[i], ep, buf);
if (ret == 0)
goto err;
break;
}
}
/* unknown keyword */
if (i == n)
goto err;
}
free(lbuf);
return 1;
err:
free(lbuf);
return 0;
}
int
fsqueue_dump_envelope_ascii(FILE *fp, struct envelope *ep)
{
char buf[8192];
enum envelope_field fields[] = {
EVP_VERSION,
EVP_ID,
EVP_TYPE,
EVP_HELO,
EVP_HOSTNAME,
EVP_ERRORLINE,
EVP_SOCKADDR,
EVP_SENDER,
EVP_RCPT,
EVP_DEST,
EVP_CTIME,
EVP_LASTTRY,
EVP_EXPIRE,
EVP_RETRY,
EVP_FLAGS
};
enum envelope_field mda_fields[] = {
EVP_MDA_METHOD,
EVP_MDA_BUFFER,
EVP_MDA_USER
};
enum envelope_field mta_fields[] = {
EVP_MTA_RELAY_HOST,
EVP_MTA_RELAY_PORT,
EVP_MTA_RELAY_CERT,
EVP_MTA_RELAY_AUTHMAP,
EVP_MTA_RELAY_FLAGS
};
enum envelope_field *pfields = NULL;
int i;
int n;
n = sizeof(fields) / sizeof(enum envelope_field);
for (i = 0; i < n; ++i) {
bzero(buf, sizeof buf);
if (! envelope_ascii_dump(fields[i], ep, buf, sizeof buf))
goto err;
if (buf[0] == '\0')
continue;
fprintf(fp, "%s: %s\n",
envelope_ascii_field_name(fields[i]), buf);
}
switch (ep->type) {
case D_MDA:
pfields = mda_fields;
n = sizeof(mda_fields) / sizeof(enum envelope_field);
break;
case D_MTA:
pfields = mta_fields;
n = sizeof(mta_fields) / sizeof(enum envelope_field);
break;
case D_BOUNCE:
/* nothing ! */
break;
default:
goto err;
}
if (pfields) {
for (i = 0; i < n; ++i) {
bzero(buf, sizeof buf);
if (! envelope_ascii_dump(pfields[i], ep, buf,
sizeof buf))
goto err;
if (buf[0] == '\0')
continue;
fprintf(fp, "%s: %s\n",
envelope_ascii_field_name(pfields[i]), buf);
}
}
if (fflush(fp) != 0)
goto err;
return 1;
err:
return 0;
}
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