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+ /*
+ ** 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,
+ 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
+ };
+
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