ossp-pkg/l2/l2_ch_smtp.c
1.2
/*
** L2 - OSSP Logging Library
** Copyright (c) 2001 The OSSP Project (http://www.ossp.org/)
** Copyright (c) 2001 Cable & Wireless Deutschland (http://www.cw.com/de/)
**
** This file is part of OSSP L2, a flexible logging library which
** can be found at http://www.ossp.org/pkg/l2/.
**
** 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.
**
** THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 AUTHORS AND COPYRIGHT HOLDERS AND THEIR
** 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.
**
** l2_ch_smtp.c: SMTP channel implementation
*/
#include "l2.h"
#include "l2_p.h" /* for l2_version */
#include <unistd.h>
#include <sys/utsname.h>
#include <sys/types.h>
#include <pwd.h>
/* declare private channel configuration */
typedef struct {
char *cpFrom;
char *cpRcpt;
char *cpSubject;
char *cpHost;
char *cpPort;
char *cpLocalProg;
char *cpLocalUser;
char *cpLocalHost;
long nTimeout;
sa_addr_t *saaServer;
sa_t *saServer;
} l2_ch_smtp_t;
/* create channel */
static l2_result_t hook_create(l2_context_t *ctx, l2_channel_t *ch)
{
l2_ch_smtp_t *cfg;
struct utsname uts;
struct passwd *pw;
/* allocate private channel configuration */
if ((cfg = (l2_ch_smtp_t *)malloc(sizeof(l2_ch_smtp_t))) == NULL)
return L2_ERR_ARG;
/* initialize configuration with reasonable defaults */
cfg->cpLocalProg = NULL;
if ((pw = getpwuid(getuid())) != NULL)
cfg->cpLocalUser = strdup(pw->pw_name);
else
cfg->cpLocalUser = l2_util_asprintf("uid#%d", getuid());
if (uname(&uts) == 0)
cfg->cpLocalHost = strdup(uts.nodename);
else
cfg->cpLocalHost = strdup("localhost");
cfg->cpFrom = l2_util_asprintf("%s@%s", cfg->cpLocalUser, cfg->cpLocalHost);
cfg->cpRcpt = NULL;
cfg->cpSubject = l2_util_asprintf("[L2] log channel output on %s", cfg->cpLocalHost);
cfg->cpHost = NULL;
cfg->cpPort = strdup("smtp");
cfg->nTimeout = 30;
cfg->saaServer = NULL;
cfg->saServer = NULL;
/* link private channel configuration into channel context */
ctx->vp = cfg;
return L2_OK;
}
/* configure channel */
static l2_result_t hook_configure(l2_context_t *ctx, l2_channel_t *ch, const char *fmt, va_list ap)
{
l2_ch_smtp_t *cfg = (l2_ch_smtp_t *)ctx->vp;
l2_param_t pa[10];
l2_result_t rv;
/* feed and call generic parameter parsing engine */
L2_PARAM_SET(pa[0], progname, STRING, &cfg->cpLocalProg);
L2_PARAM_SET(pa[1], localhost, STRING, &cfg->cpLocalHost);
L2_PARAM_SET(pa[2], localuser, STRING, &cfg->cpLocalUser);
L2_PARAM_SET(pa[3], from, STRING, &cfg->cpFrom);
L2_PARAM_SET(pa[4], rcpt, STRING, &cfg->cpRcpt);
L2_PARAM_SET(pa[5], subject, STRING, &cfg->cpSubject);
L2_PARAM_SET(pa[6], host, STRING, &cfg->cpHost);
L2_PARAM_SET(pa[7], port, STRING, &cfg->cpPort);
L2_PARAM_SET(pa[8], timeout, INT, &cfg->nTimeout);
L2_PARAM_END(pa[9]);
rv = l2_util_setparams(pa, fmt, ap);
return rv;
}
/* open channel */
static l2_result_t hook_open(l2_context_t *ctx, l2_channel_t *ch)
{
l2_ch_smtp_t *cfg = (l2_ch_smtp_t *)ctx->vp;
sa_rc_t rc;
/* make sure a path was set */
if (cfg->cpHost == NULL || cfg->cpRcpt == NULL)
return L2_ERR_USE;
/* create socket address */
if ((rc = sa_u2a(&cfg->saaServer, "tcp://%s:%s", cfg->cpHost, cfg->cpPort)) != SA_OK)
return (rc == SA_ERR_SYS ? L2_ERR_SYS : L2_ERR_INT);
/* create socket */
if ((rc = sa_create(&cfg->saServer)) != SA_OK)
return (rc == SA_ERR_SYS ? L2_ERR_SYS : L2_ERR_INT);
/* configure socket parameters */
sa_timeout(cfg->saServer, cfg->nTimeout, 0);
sa_buffers(cfg->saServer, 1024, 1024);
return L2_OK;
}
/* write to channel */
static l2_result_t hook_write(l2_context_t *ctx, l2_channel_t *ch,
l2_level_t level, const char *buf, size_t buf_size)
{
l2_ch_smtp_t *cfg = (l2_ch_smtp_t *)ctx->vp;
char caLine[1024];
int bSent;
sa_t *sa;
sa_addr_t *saa;
sa_rc_t rc;
size_t n;
/* establish connection to server */
saa = cfg->saaServer;
sa = cfg->saServer;
if ((rc = sa_connect(sa, saa)) != SA_OK)
return (rc == SA_ERR_SYS ? L2_ERR_SYS : L2_ERR_INT);
/*
* Sample SMTP transaction for reference:
*
* | 220 en1.engelschall.com ESMTP SMTP Sendmail 8.11.0+ ready
* | HELO l2
* | 250 en1.engelschall.com Hello en1.engelschall.com [141.1.129.1], pleased to meet you
* | MAIL From: <l2@localhost>
* | 250 2.1.0 <l2@localhost>... Sender ok
* | RCPT To: <rse@engelschall.com>
* | 250 2.1.5 <rse@engelschall.com>... Recipient ok
* | DATA
* | 354 Enter mail, end with "." on a line by itself
* | From: l2@localhost
* | To: rse@engelschall.com
* | Subject: [L2] SMTP channel output
* |
* | test log entry
* | .
* | 250 2.0.0 f88Aev847031 Message accepted for delivery
* | QUIT
* | 221 2.0.0 en1.engelschall.com closing connection
*
* For more details about SMTP, see RFC 2821:
* Simple Mail Transfer Protocol; J. Klensin; April 2001.
*/
bSent = FALSE;
if (sa_readline(sa, caLine, sizeof(caLine), &n) == SA_OK
&& n > 3 && atoi(caLine) == 220) {
sa_printf(sa, "HELO %s\r\n", cfg->cpLocalHost);
if (sa_readline(sa, caLine, sizeof(caLine), &n) == SA_OK
&& n > 3 && atoi(caLine) == 250) {
sa_printf(sa, "MAIL FROM:<%s>\r\n", cfg->cpFrom);
if (sa_readline(sa, caLine, sizeof(caLine), &n) == SA_OK
&& n > 3 && atoi(caLine) == 250) {
sa_printf(sa, "RCPT TO:<%s>\r\n", cfg->cpRcpt);
if (sa_readline(sa, caLine, sizeof(caLine), &n) == SA_OK
&& n > 3 && atoi(caLine) == 250) {
sa_printf(sa, "DATA\r\n");
if (sa_readline(sa, caLine, sizeof(caLine), &n) == SA_OK
&& n > 3 && atoi(caLine) == 354) {
sa_printf(sa, "From: %s\r\n", cfg->cpFrom);
sa_printf(sa, "To: %s\r\n", cfg->cpRcpt);
sa_printf(sa, "Subject: %s\r\n", cfg->cpSubject);
if (cfg->cpLocalProg != NULL)
sa_printf(sa, "User-Agent: %s, %s\r\n",
cfg->cpLocalProg, l2_version.v_gnu);
else
sa_printf(sa, "User-Agent: %s\r\n", l2_version.v_gnu);
sa_printf(sa, "\r\n");
if (cfg->cpLocalProg != NULL)
sa_printf(sa, "Program %s of user %s on host %s logged:\r\n",
cfg->cpLocalProg, cfg->cpLocalUser, cfg->cpLocalHost);
else
sa_printf(sa, "A program of user %s on host %s logged:\r\n",
cfg->cpLocalUser, cfg->cpLocalHost);
/* FIXME: dot-escaping and remove doubled newline */
sa_write(sa, buf, buf_size, &n);
sa_printf(sa, "\r\n");
sa_printf(sa, ".\r\n");
if (sa_readline(sa, caLine, sizeof(caLine), &n) == SA_OK
&& n > 3 && atoi(caLine) == 250) {
sa_printf(sa, "QUIT\r\n");
sa_readline(sa, caLine, sizeof(caLine), &n);
bSent = TRUE;
}
}
}
}
}
}
/* shutdown connection to server */
sa_shutdown(sa, "rw");
return (bSent ? L2_OK : L2_ERR_IO);
}
/* close channel */
static l2_result_t hook_close(l2_context_t *ctx, l2_channel_t *ch)
{
l2_ch_smtp_t *cfg = (l2_ch_smtp_t *)ctx->vp;
/* destroy remote address */
if (cfg->saServer != NULL) {
sa_destroy(cfg->saServer);
cfg->saServer = NULL;
}
if (cfg->saaServer != NULL) {
free(cfg->saaServer);
cfg->saaServer = NULL;
}
return L2_OK;
}
/* destroy channel */
static l2_result_t hook_destroy(l2_context_t *ctx, l2_channel_t *ch)
{
l2_ch_smtp_t *cfg = (l2_ch_smtp_t *)ctx->vp;
/* destroy channel configuration */
if (cfg->cpFrom != NULL)
free(cfg->cpFrom);
if (cfg->cpRcpt != NULL)
free(cfg->cpRcpt);
if (cfg->cpSubject != NULL)
free(cfg->cpSubject);
if (cfg->cpHost != NULL)
free(cfg->cpHost);
if (cfg->cpPort != NULL)
free(cfg->cpPort);
if (cfg->cpLocalHost != NULL)
free(cfg->cpLocalHost);
if (cfg->cpLocalUser != NULL)
free(cfg->cpLocalUser);
free(cfg);
return L2_OK;
}
/* exported channel handler structure */
l2_handler_t l2_handler_smtp = {
L2_CHANNEL_OUTPUT,
hook_create,
hook_configure,
hook_open,
hook_write,
NULL,
hook_close,
hook_destroy
};
