* Concept due to Harry Hochheiser. Implementation by ESR. Cleanup and
* strict RFC821 compliance by Cameron MacPherson.
*
- * Copyright 1996 Eric S. Raymond
- * All rights reserved.
+ * Copyright 1997 Eric S. Raymond, 2009 Matthias Andree
* For license terms, see the file COPYING in this directory.
*/
-#include <config.h>
+#include "config.h"
+#include "fetchmail.h"
+
+#include <ctype.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
+#include <signal.h>
#include "socket.h"
-#include "fetchmail.h"
#include "smtp.h"
+#include "gettext.h"
+
+struct opt
+{
+ const char *name;
+ int value;
+};
+
+static struct opt extensions[] =
+{
+ {"8BITMIME", ESMTP_8BITMIME},
+ {"SIZE", ESMTP_SIZE},
+ {"ETRN", ESMTP_ETRN},
+ {"AUTH ", ESMTP_AUTH},
+#ifdef ODMR_ENABLE
+ {"ATRN", ESMTP_ATRN},
+#endif /* ODMR_ENABLE */
+ {(char *)NULL, 0},
+};
+
+char smtp_response[MSGBUFSIZE];
-int SMTP_helo(FILE *sockfp,char *host)
+/* XXX: this must not be used for LMTP! */
+int SMTP_helo(int sock, char smtp_mode, const char *host)
/* send a "HELO" message to the SMTP listener */
{
int ok;
- fprintf(sockfp,"HELO %s\r\n", host);
- if (outlevel == O_VERBOSE)
- fprintf(stderr, "SMTP> HELO %s\n", host);
- ok = SMTP_ok(sockfp,NULL);
+ SockPrintf(sock,"HELO %s\r\n", host);
+ if (outlevel >= O_MONITOR)
+ report(stdout, "%cMTP> HELO %s\n", smtp_mode, host);
+ ok = SMTP_ok(sock, smtp_mode, TIMEOUT_HELO);
return ok;
}
-int SMTP_from(FILE *sockfp, char *from)
+static void SMTP_auth_error(int sock, const char *msg)
+{
+ SockPrintf(sock, "*\r\n");
+ SockRead(sock, smtp_response, sizeof(smtp_response) - 1);
+ if (outlevel >= O_MONITOR) report(stdout, "%s", msg);
+}
+
+static void SMTP_auth(int sock, char smtp_mode, char *username, char *password, char *buf)
+/* ESMTP Authentication support for fetchmail by Wojciech Polak */
+{
+ int c;
+ char *p = 0;
+ char b64buf[512];
+ char tmp[512];
+
+ if (!username || !password) return;
+
+ memset(b64buf, 0, sizeof(b64buf));
+ memset(tmp, 0, sizeof(tmp));
+
+ if (strstr(buf, "CRAM-MD5")) {
+ unsigned char digest[16];
+ memset(digest, 0, sizeof(digest));
+
+ if (outlevel >= O_MONITOR)
+ report(stdout, GT_("ESMTP CRAM-MD5 Authentication...\n"));
+ SockPrintf(sock, "AUTH CRAM-MD5\r\n");
+ SockRead(sock, smtp_response, sizeof(smtp_response) - 1);
+ strlcpy(tmp, smtp_response, sizeof(tmp));
+
+ if (strncmp(tmp, "334", 3)) { /* Server rejects AUTH */
+ SMTP_auth_error(sock, GT_("Server rejected the AUTH command.\n"));
+ return;
+ }
+
+ p = strchr(tmp, ' ');
+ p++;
+ /* (hmh) from64tobits will not NULL-terminate strings! */
+ if (from64tobits(b64buf, p, sizeof(b64buf) - 1) <= 0) {
+ SMTP_auth_error(sock, GT_("Bad base64 reply from server.\n"));
+ return;
+ }
+ if (outlevel >= O_DEBUG)
+ report(stdout, GT_("Challenge decoded: %s\n"), b64buf);
+ hmac_md5((unsigned char *)password, strlen(password),
+ (unsigned char *)b64buf, strlen(b64buf), digest, sizeof(digest));
+ snprintf(tmp, sizeof(tmp),
+ "%s %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
+ username, digest[0], digest[1], digest[2], digest[3],
+ digest[4], digest[5], digest[6], digest[7], digest[8],
+ digest[9], digest[10], digest[11], digest[12], digest[13],
+ digest[14], digest[15]);
+
+ to64frombits(b64buf, tmp, strlen(tmp));
+ SockPrintf(sock, "%s\r\n", b64buf);
+ SMTP_ok(sock, smtp_mode, TIMEOUT_DEFAULT);
+ }
+ else if (strstr(buf, "PLAIN")) {
+ int len;
+ if (outlevel >= O_MONITOR)
+ report(stdout, GT_("ESMTP PLAIN Authentication...\n"));
+ snprintf(tmp, sizeof(tmp), "^%s^%s", username, password);
+
+ len = strlen(tmp);
+ for (c = len - 1; c >= 0; c--)
+ {
+ if (tmp[c] == '^')
+ tmp[c] = '\0';
+ }
+ to64frombits(b64buf, tmp, len);
+ SockPrintf(sock, "AUTH PLAIN %s\r\n", b64buf);
+ SMTP_ok(sock, smtp_mode, TIMEOUT_DEFAULT);
+ }
+ else if (strstr(buf, "LOGIN")) {
+ if (outlevel >= O_MONITOR)
+ report(stdout, GT_("ESMTP LOGIN Authentication...\n"));
+ SockPrintf(sock, "AUTH LOGIN\r\n");
+ SockRead(sock, smtp_response, sizeof(smtp_response) - 1);
+ strlcpy(tmp, smtp_response, sizeof(tmp));
+
+ if (strncmp(tmp, "334", 3)) { /* Server rejects AUTH */
+ SMTP_auth_error(sock, GT_("Server rejected the AUTH command.\n"));
+ return;
+ }
+
+ p = strchr(tmp, ' ');
+ p++;
+ if (from64tobits(b64buf, p, sizeof(b64buf) - 1) <= 0) {
+ SMTP_auth_error(sock, GT_("Bad base64 reply from server.\n"));
+ return;
+ }
+ to64frombits(b64buf, username, strlen(username));
+ SockPrintf(sock, "%s\r\n", b64buf);
+ SockRead(sock, smtp_response, sizeof(smtp_response) - 1);
+ strlcpy(tmp, smtp_response, sizeof(tmp));
+ p = strchr(tmp, ' ');
+ if (!p) {
+ SMTP_auth_error(sock, GT_("Bad base64 reply from server.\n"));
+ return;
+ }
+ p++;
+ memset(b64buf, 0, sizeof(b64buf));
+ if (from64tobits(b64buf, p, sizeof(b64buf) - 1) <= 0) {
+ SMTP_auth_error(sock, GT_("Bad base64 reply from server.\n"));
+ return;
+ }
+ to64frombits(b64buf, password, strlen(password));
+ SockPrintf(sock, "%s\r\n", b64buf);
+ SMTP_ok(sock, smtp_mode, TIMEOUT_DEFAULT);
+ }
+ return;
+}
+
+int SMTP_ehlo(int sock, char smtp_mode, const char *host, char *name, char *password, int *opt)
+/* send a "EHLO" message to the SMTP listener, return extension status bits */
+{
+ struct opt *hp;
+ char auth_response[511];
+ SIGHANDLERTYPE alrmsave;
+ const int tmout = (mytimeout >= TIMEOUT_HELO ? mytimeout : TIMEOUT_HELO);
+
+ SockPrintf(sock,"%cHLO %s\r\n", (smtp_mode == 'S') ? 'E' : smtp_mode, host);
+ if (outlevel >= O_MONITOR)
+ report(stdout, "%cMTP> %cHLO %s\n",
+ smtp_mode, (smtp_mode == 'S') ? 'E' : smtp_mode, host);
+
+ alrmsave = set_signal_handler(SIGALRM, null_signal_handler);
+ set_timeout(tmout);
+
+ *opt = 0;
+ while ((SockRead(sock, smtp_response, sizeof(smtp_response)-1)) != -1)
+ {
+ size_t n;
+
+ set_timeout(0);
+ (void)set_signal_handler(SIGALRM, alrmsave);
+
+ n = strlen(smtp_response);
+ if (n > 0 && smtp_response[n-1] == '\n')
+ smtp_response[--n] = '\0';
+ if (n > 0 && smtp_response[n-1] == '\r')
+ smtp_response[--n] = '\0';
+ if (n < 4)
+ return SM_ERROR;
+ smtp_response[n] = '\0';
+ if (outlevel >= O_MONITOR)
+ report(stdout, "%cMTP< %s\n", smtp_mode, smtp_response);
+ for (hp = extensions; hp->name; hp++)
+ if (!strncasecmp(hp->name, smtp_response+4, strlen(hp->name))) {
+ *opt |= hp->value;
+ if (strncmp(hp->name, "AUTH ", 5) == 0)
+ strncpy(auth_response, smtp_response, sizeof(auth_response));
+ auth_response[sizeof(auth_response)-1] = '\0';
+ }
+ if ((smtp_response[0] == '1' || smtp_response[0] == '2' || smtp_response[0] == '3') && smtp_response[3] == ' ') {
+ if (*opt & ESMTP_AUTH)
+ SMTP_auth(sock, smtp_mode, name, password, auth_response);
+ return SM_OK;
+ }
+ else if (smtp_response[3] != '-')
+ return SM_ERROR;
+
+ alrmsave = set_signal_handler(SIGALRM, null_signal_handler);
+ set_timeout(tmout);
+ }
+ return SM_UNRECOVERABLE;
+}
+
+int SMTP_from(int sock, char smtp_mode, const char *from, const char *opts)
/* send a "MAIL FROM:" message to the SMTP listener */
{
- int ok;
+ int ok;
+ char buf[MSGBUFSIZE];
- fprintf(sockfp,"MAIL FROM:<%s>\r\n", from);
- if (outlevel == O_VERBOSE)
- fprintf(stderr, "SMTP> MAIL FROM:<%s>\n", from);
- ok = SMTP_ok(sockfp,NULL);
- return ok;
+ if (from[0]=='<')
+ snprintf(buf, sizeof(buf), "MAIL FROM:%s", from);
+ else
+ snprintf(buf, sizeof(buf), "MAIL FROM:<%s>", from);
+ if (opts)
+ snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), "%s", opts);
+ SockPrintf(sock,"%s\r\n", buf);
+ if (outlevel >= O_MONITOR)
+ report(stdout, "%cMTP> %s\n", smtp_mode, buf);
+ ok = SMTP_ok(sock, smtp_mode, TIMEOUT_MAIL);
+ return ok;
}
-int SMTP_rcpt(FILE *sockfp, char *to)
+int SMTP_rcpt(int sock, char smtp_mode, const char *to)
/* send a "RCPT TO:" message to the SMTP listener */
{
int ok;
- fprintf(sockfp,"RCPT TO:<%s>\r\n", to);
- if (outlevel == O_VERBOSE)
- fprintf(stderr, "SMTP> RCPT TO:<%s>\n", to);
- ok = SMTP_ok(sockfp,NULL);
+ SockPrintf(sock,"RCPT TO:<%s>\r\n", to);
+ if (outlevel >= O_MONITOR)
+ report(stdout, "%cMTP> RCPT TO:<%s>\n", smtp_mode, to);
+ ok = SMTP_ok(sock, smtp_mode, TIMEOUT_RCPT);
return ok;
}
-int SMTP_data(FILE *sockfp)
+int SMTP_data(int sock, char smtp_mode)
/* send a "DATA" message to the SMTP listener */
{
int ok;
- fprintf(sockfp,"DATA\r\n");
- if (outlevel == O_VERBOSE)
- fprintf(stderr, "SMTP> DATA\n");
- ok = SMTP_ok(sockfp,NULL);
+ SockPrintf(sock,"DATA\r\n");
+ if (outlevel >= O_MONITOR)
+ report(stdout, "%cMTP> DATA\n", smtp_mode);
+ ok = SMTP_ok(sock, smtp_mode, TIMEOUT_DATA);
return ok;
}
-int SMTP_quit(FILE *sockfp)
-/* send a "QUIT" message to the SMTP listener */
+int SMTP_rset(int sock, char smtp_mode)
+/* send a "RSET" message to the SMTP listener */
{
int ok;
- fprintf(sockfp,"QUIT\r\n");
- if (outlevel == O_VERBOSE)
- fprintf(stderr, "SMTP> QUIT\n");
- ok = SMTP_ok(sockfp,NULL);
+ SockPrintf(sock,"RSET\r\n");
+ if (outlevel >= O_MONITOR)
+ report(stdout, "%cMTP> RSET\n", smtp_mode);
+ ok = SMTP_ok(sock, smtp_mode, TIMEOUT_DEFAULT);
return ok;
}
-int SMTP_eom(FILE *sockfp)
-/* send a message data terminator to the SMTP listener */
+int SMTP_quit(int sock, char smtp_mode)
+/* send a "QUIT" message to the SMTP listener */
{
int ok;
- fprintf(sockfp,".\r\n");
- if (outlevel == O_VERBOSE)
- fprintf(stderr, "SMTP>. (EOM)\n");
- ok = SMTP_ok(sockfp,NULL);
+ SockPrintf(sock,"QUIT\r\n");
+ if (outlevel >= O_MONITOR)
+ report(stdout, "%cMTP> QUIT\n", smtp_mode);
+ ok = SMTP_ok(sock, smtp_mode, TIMEOUT_DEFAULT);
return ok;
}
-void SMTP_rset(FILE *sockfp)
-/* send a "RSET" message to the SMTP listener */
-{
- fprintf(sockfp,"RSET\r\n");
- if (outlevel == O_VERBOSE)
- fprintf(stderr, "SMTP> RSET\n");
-}
-
-static int SMTP_check(FILE *sockfp,char *argbuf)
-/* returns status of SMTP connection */
+int SMTP_eom(int sock, char smtp_mode)
+/* send a message data terminator to the SMTP listener */
{
- int ok;
- char buf[SMTPBUFSIZE];
-
- if (fgets(buf, sizeof(buf)-1, sockfp) != (char *)NULL) {
- if (outlevel == O_VERBOSE)
- {
- char *sp, *tp;
+ SockPrintf(sock,".\r\n");
+ if (outlevel >= O_MONITOR)
+ report(stdout, "%cMTP>. (EOM)\n", smtp_mode);
- for (tp = sp = buf; *sp; sp++)
- if (*sp != '\r')
- *tp++ = *sp;
- *tp++ = '\0';
- fprintf(stderr, "SMTP< %s", buf);
- }
- if (argbuf)
- strcpy(argbuf,buf);
- if (buf[0] == '1' || buf[0] == '2' || buf[0] == '3')
- ok = SM_OK;
- else
- ok = SM_ERROR;
- }
+ /*
+ * When doing LMTP, must process many of these at the outer level.
+ */
+ if (smtp_mode == 'S')
+ return SMTP_ok(sock, smtp_mode, TIMEOUT_EOM);
else
- ok = SM_UNRECOVERABLE;
- return (ok);
+ return SM_OK;
}
-int SMTP_ok(FILE *sockfp,char *argbuf)
-/* accepts SMTP response, returns status of SMTP connection */
+time_t last_smtp_ok = 0;
+
+int SMTP_ok(int sock, char smtp_mode, int mintimeout)
+/**< returns status of SMTP connection and saves the message in
+ * smtp_response, without trailing [CR]LF, but with normalized CRLF
+ * between multiple lines of multi-line replies */
{
- int ok;
+ SIGHANDLERTYPE alrmsave;
+ char reply[MSGBUFSIZE], *i;
- /* I can tell that the SMTP server connection is ok if I can read a
- status message that starts with "1xx" ,"2xx" or "3xx".
- Therefore, it can't be ok if there's no data waiting to be read
-
- Tried to deal with this with a call to SockDataWaiting, but
- it failed badly.
+ /* set an alarm for smtp ok */
+ alrmsave = set_signal_handler(SIGALRM, null_signal_handler);
+ set_timeout(mytimeout >= mintimeout ? mytimeout : mintimeout);
- */
+ smtp_response[0] = '\0';
- ok = SMTP_check(sockfp,argbuf);
- if (ok == SM_ERROR) /* if we got an error, */
+ while ((SockRead(sock, reply, sizeof(reply)-1)) != -1)
{
- SMTP_rset(sockfp);
- ok = SMTP_check(sockfp,argbuf); /* how does it look now ? */
- if (ok == SM_OK)
- ok = SM_ERROR; /* It's just a simple error, for*/
- /* the current message */
- else
- ok = SM_UNRECOVERABLE; /* if it still says error, we're */
- /* in bad shape */
+ size_t n;
+
+ /* restore alarm */
+ set_timeout(0);
+ set_signal_handler(SIGALRM, alrmsave);
+
+ n = strlen(reply);
+ if (n > 0 && reply[n-1] == '\n')
+ reply[--n] = '\0';
+ if (n > 0 && reply[n-1] == '\r')
+ reply[--n] = '\0';
+
+ /* stomp over control characters */
+ for (i = reply; *i; i++)
+ if (iscntrl((unsigned char)*i))
+ *i = '?';
+
+ if (outlevel >= O_MONITOR)
+ report(stdout, "%cMTP< %s\n", smtp_mode, reply);
+ /* note that \0 is part of the strchr search string and the
+ * blank after the reply code is optional (RFC 5321 4.2.1) */
+ if (n < 3 || !strchr(" -", reply[3]))
+ {
+ if (outlevel >= O_MONITOR)
+ report(stderr, GT_("smtp listener protocol error\n"));
+ return SM_UNRECOVERABLE;
+ }
+
+ last_smtp_ok = time((time_t *) NULL);
+
+ strlcat(smtp_response, reply, sizeof(smtp_response));
+
+ if (strchr("123", reply[0])
+ && isdigit((unsigned char)reply[1])
+ && isdigit((unsigned char)reply[2])
+ && strchr(" ", reply[3])) /* matches space and \0 */ {
+ return SM_OK;
+ } else if (reply[3] != '-')
+ return SM_ERROR;
+
+ strlcat(smtp_response, "\r\n", sizeof(smtp_response));
+
+ /* set an alarm for smtp ok */
+ set_signal_handler(SIGALRM, null_signal_handler);
+ set_timeout(mytimeout);
}
- return ok;
+
+ /* restore alarm */
+ set_timeout(0);
+ set_signal_handler(SIGALRM, alrmsave);
+
+ if (outlevel >= O_MONITOR)
+ report(stderr, GT_("smtp listener protocol error\n"));
+ return SM_UNRECOVERABLE;
}
/* smtp.c ends here */