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notify.c
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notify.c
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/* notify.c -- Module to notify of new mail
*
* Copyright (c) 1994-2008 Carnegie Mellon University. All rights reserved.
*
* 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. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any legal
* details, please contact
* Carnegie Mellon University
* Center for Technology Transfer and Enterprise Creation
* 4615 Forbes Avenue
* Suite 302
* Pittsburgh, PA 15213
* (412) 268-7393, fax: (412) 268-7395
* innovation@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, 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.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <string.h>
#include <syslog.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/un.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include "append.h"
#include "global.h"
#include "notify.h"
#include "xstrlcpy.h"
#include "xstrlcat.h"
#include "mailbox.h"
#include "util.h"
#include "times.h"
/* generated headers are not necessarily in current directory */
#include "imap/imap_err.h"
#define FNAME_NOTIFY_SOCK "/socket/notify"
static int add_arg(char *buf, int max_size, const char *arg, int *buflen)
{
const char *myarg = (arg ? arg : "");
int len = strlen(myarg) + 1;
if (*buflen + len > max_size) return -1;
strcat(buf+*buflen, myarg);
*buflen += len;
return 0;
}
static void notify_dlist(const char *sockpath, const char *method,
const char *class, const char *priority,
const char *user, const char *mailbox,
int nopt, const char **options,
const char *message, const char *fname,
const char *loginfo)
{
struct sockaddr_un sun_data;
struct protstream *in = NULL, *out = NULL;
struct dlist *dl = dlist_newkvlist(NULL, "NOTIFY");
struct dlist *res = NULL;
struct dlist *il;
int c;
int soc = -1;
int i;
dlist_setatom(dl, "METHOD", method);
dlist_setatom(dl, "CLASS", class);
dlist_setatom(dl, "PRIORITY", priority);
dlist_setatom(dl, "USER", user);
dlist_setatom(dl, "MAILBOX", mailbox);
il = dlist_newlist(dl, "OPTIONS");
for (i = 0; i < nopt; i++)
dlist_setatom(il, NULL, options[i]);
dlist_setatom(dl, "MESSAGE", message);
dlist_setatom(dl, "FILEPATH", fname);
memset((char *)&sun_data, 0, sizeof(sun_data));
sun_data.sun_family = AF_UNIX;
strlcpy(sun_data.sun_path, sockpath, sizeof(sun_data.sun_path));
soc = socket(PF_UNIX, SOCK_STREAM, 0);
if (soc < 0) {
syslog(LOG_ERR,
"NOTIFY(%s): unable to create notify socket(): %m", loginfo);
goto out;
}
if (connect(soc, (struct sockaddr *)&sun_data, sizeof(sun_data)) < 0) {
syslog(LOG_ERR,
"NOTIFY(%s): failed to connect to %s: %m", loginfo, sockpath);
goto out;
}
in = prot_new(soc, 0);
out = prot_new(soc, 1);
/* Force use of LITERAL+ */
prot_setisclient(in, 1);
prot_setisclient(out, 1);
dlist_print(dl, 1, out);
prot_printf(out, "\r\n");
prot_flush(out);
c = dlist_parse(&res, 1, 0, in);
if (c == '\r') c = prot_getc(in);
/* XXX - do something with the response? Like have NOTIFY answer */
if (c == '\n' && res && res->name) {
syslog(LOG_NOTICE, "NOTIFY(%s): response %s to method %s",
loginfo, res->name, method);
}
else {
syslog(LOG_ERR, "NOTIFY(%s): error sending %s to %s",
loginfo, method, sockpath);
}
out:
if (in) prot_free(in);
if (out) prot_free(out);
if (soc >= 0) close(soc);
dlist_free(&dl);
dlist_free(&res);
}
EXPORTED void notify(const char *method,
const char *class, const char *priority,
const char *user, const char *mailbox,
int nopt, const char **options,
const char *message, const char *fname)
{
const char *notify_sock = config_getstring(IMAPOPT_NOTIFYSOCKET);
int soc = -1;
struct sockaddr_un sun_data;
char buf[NOTIFY_MAXSIZE] = "", noptstr[20];
int buflen = 0;
int i, r = 0;
unsigned bufsiz;
socklen_t optlen;
struct buf logbuf = BUF_INITIALIZER;
char *loginfo = NULL;
buf_setcstr(&logbuf, class);
if (user) {
buf_printf(&logbuf, ", %s", user);
if (mailbox) {
buf_printf(&logbuf, ", %s", mailbox);
}
}
loginfo = buf_release(&logbuf);
if (!strncmp(notify_sock, "dlist:", 6)) {
notify_dlist(notify_sock+6, method, class, priority,
user, mailbox, nopt, options,
message, fname, loginfo);
free(loginfo);
return;
}
soc = socket(AF_UNIX, SOCK_DGRAM, 0);
if (soc == -1) {
syslog(LOG_ERR,
"NOTIFY(%s): unable to create notify socket(): %m", loginfo);
goto out;
}
memset((char *)&sun_data, 0, sizeof(sun_data));
sun_data.sun_family = AF_UNIX;
if (notify_sock) {
strlcpy(sun_data.sun_path, notify_sock, sizeof(sun_data.sun_path));
}
else {
strlcpy(sun_data.sun_path, config_dir, sizeof(sun_data.sun_path));
strlcat(sun_data.sun_path,
FNAME_NOTIFY_SOCK, sizeof(sun_data.sun_path));
}
/* Get send buffer size */
optlen = sizeof(bufsiz);
r = getsockopt(soc, SOL_SOCKET, SO_SNDBUF, &bufsiz, &optlen);
if (r == -1) {
syslog(LOG_ERR,
"NOTIFY(%s): unable to getsockopt(SO_SNDBUF) on socket: %m",
loginfo);
goto out;
}
/* Use minimum of 1/10 of send buffer size (-overhead) NOTIFY_MAXSIZE */
bufsiz = MIN(bufsiz / 10 - 32, NOTIFY_MAXSIZE);
/*
* build request of the form:
*
* method NUL class NUL priority NUL user NUL mailbox NUL
* nopt NUL N(option NUL) message NUL
*/
r = add_arg(buf, bufsiz, method, &buflen);
if (!r) r = add_arg(buf, bufsiz, class, &buflen);
if (!r) r = add_arg(buf, bufsiz, priority, &buflen);
if (!r) r = add_arg(buf, bufsiz, user, &buflen);
if (!r) r = add_arg(buf, bufsiz, mailbox, &buflen);
snprintf(noptstr, sizeof(noptstr), "%d", nopt);
if (!r) r = add_arg(buf, bufsiz, noptstr, &buflen);
for (i = 0; !r && i < nopt; i++) {
r = add_arg(buf, bufsiz, options[i], &buflen);
}
if (!r) r = add_arg(buf, bufsiz, message, &buflen);
if (!r && fname) r = add_arg(buf, bufsiz, fname, &buflen);
if (r) {
syslog(LOG_ERR, "NOTIFY(%s): datagram too large", loginfo);
goto out;
}
r = sendto(soc, buf, buflen, 0,
(struct sockaddr *)&sun_data, sizeof(sun_data));
if (r < 0) {
syslog(LOG_ERR, "NOTIFY(%s): unable to sendto() socket: %m", loginfo);
goto out;
}
if (r < buflen) {
syslog(LOG_ERR, "NOTIFY(%s): short write to socket", loginfo);
goto out;
}
out:
xclose(soc);
free(loginfo);
}

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