-/* Copyright 1996 Eric S. Raymond
- * All rights reserved.
+/*
+ * smtp.c -- code for speaking SMTP to a listener port
+ *
+ * Concept due to Harry Hochheiser. Implementation by ESR. Cleanup and
+ * strict RFC821 compliance by Cameron MacPherson.
+ *
+ * Copyright 1997 Eric S. Raymond
* For license terms, see the file COPYING in this directory.
*/
-/***********************************************************************
- module: smtp.c
- project: fetchmail
- programmer: Harry Hochheiser
- cleaned up and made rfc821 compliant by Cameron MacPherson
- description: Handling of SMTP connections, and processing of mail
- to be forwarded via SMTP connections.
-
- ***********************************************************************/
-
#include <stdio.h>
-#include <config.h>
-#include <sys/types.h>
#include <unistd.h>
#include <string.h>
-#include "socket.h"
#include "fetchmail.h"
+#include "socket.h"
#include "smtp.h"
+#include "config.h"
+#include "i18n.h"
-/*********************************************************************
- function: SMTP_helo
- description: Send a "HELO" message to the SMTP server.
+struct opt
+{
+ const char *name;
+ int value;
+};
- arguments:
- socket TCP/IP socket for connection to SMTP
- return value: Result of SMTP_OK: based on codes in fetchmail.h.
-
- *********************************************************************/
+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];
+
+static char smtp_mode = 'S';
+
+void SMTP_setmode(char sl)
+/* set whether we are speaking SMTP or LMTP */
+{
+ smtp_mode = sl;
+}
-int SMTP_helo(int socket,char *host)
+int SMTP_helo(int sock,const char *host)
+/* send a "HELO" message to the SMTP listener */
{
int ok;
- SockPrintf(socket,"HELO %s\r\n", host);
- if (outlevel == O_VERBOSE)
- fprintf(stderr, "SMTP> HELO %s\n", host);
- ok = SMTP_ok(socket,NULL);
+ SockPrintf(sock,"HELO %s\r\n", host);
+ if (outlevel >= O_MONITOR)
+ report(stdout, "SMTP> HELO %s\n", host);
+ ok = SMTP_ok(sock);
return ok;
}
-/*********************************************************************
- function: SMTP_from
- description: Send a "MAIL FROM:" message to the SMTP server.
-
- arguments:
- socket TCP/IP socket for connection to SMTP
- from user name/host of originator
+static void SMTP_auth_error(int sock, char *msg)
+{
+ SockPrintf(sock, "*\r\n");
+ SockRead(sock, smtp_response, sizeof(smtp_response) - 1);
+ if (outlevel >= O_MONITOR) report(stdout, msg);
+}
- Note: these args are likely to change, as we get fancier about
- handling the names.
+static void SMTP_auth(int sock, 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);
+ strncpy(tmp, smtp_response, sizeof(tmp));
+
+ if (strncmp(tmp, "334 ", 4)) { /* 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(password, strlen(password),
+ b64buf, strlen(b64buf), digest, sizeof(digest));
+#ifdef HAVE_SNPRINTF
+ snprintf(tmp, sizeof(tmp),
+#else
+ sprintf(tmp,
+#endif /* HAVE_SNPRINTF */
+ "%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);
+ }
+ else if (strstr(buf, "PLAIN")) {
+ int len;
+ if (outlevel >= O_MONITOR)
+ report(stdout, GT_("ESMTP PLAIN Authentication...\n"));
+#ifdef HAVE_SNPRINTF
+ snprintf(tmp, sizeof(tmp),
+#else
+ sprintf(tmp,
+#endif /* HAVE_SNPRINTF */
+ "^%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);
+ }
+ 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);
+ strncpy(tmp, smtp_response, sizeof(tmp));
+
+ if (strncmp(tmp, "334 ", 4)) { /* 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);
+ strncpy(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);
+ }
+ return;
+}
- return value: Result of SMTP_ok: based on codes in fetchmail.h.
-
- *********************************************************************/
-int SMTP_from(int socket, char *from)
+int SMTP_ehlo(int sock, const char *host, char *name, char *password, int *opt)
+/* send a "EHLO" message to the SMTP listener, return extension status bits */
{
- int ok;
+ struct opt *hp;
+ char auth_response[511];
- SockPrintf(socket,"MAIL FROM:<%s>\r\n", from);
- if (outlevel == O_VERBOSE)
- fprintf(stderr, "SMTP> MAIL FROM:<%s>\n", from);
- ok = SMTP_ok(socket,NULL);
- return ok;
+ 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);
+
+ *opt = 0;
+ while ((SockRead(sock, smtp_response, sizeof(smtp_response)-1)) != -1)
+ {
+ int n = strlen(smtp_response);
+
+ if (smtp_response[strlen(smtp_response)-1] == '\n')
+ smtp_response[strlen(smtp_response)-1] = '\0';
+ if (smtp_response[strlen(smtp_response)-1] == '\r')
+ smtp_response[strlen(smtp_response)-1] = '\0';
+ if (n < 4)
+ return SM_ERROR;
+ smtp_response[n] = '\0';
+ if (outlevel >= O_MONITOR)
+ report(stdout, "SMTP< %s\n", 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));
+ }
+ if ((smtp_response[0] == '1' || smtp_response[0] == '2' || smtp_response[0] == '3') && smtp_response[3] == ' ') {
+ if (*opt & ESMTP_AUTH)
+ SMTP_auth(sock, name, password, auth_response);
+ return SM_OK;
+ }
+ else if (smtp_response[3] != '-')
+ return SM_ERROR;
+ }
+ return SM_UNRECOVERABLE;
}
-/*********************************************************************
- function: SMTP_rcpt
- description: Send a "RCPT TO:" message to the SMTP server.
-
- arguments:
- socket TCP/IP socket for connection to SMTP
- touser: user name of recipient
- tohost: host name of recipient
+int SMTP_from(int sock, const char *from, const char *opts)
+/* send a "MAIL FROM:" message to the SMTP listener */
+{
+ int ok;
+ char buf[MSGBUFSIZE];
+
+ if (strchr(from, '<'))
+#ifdef HAVE_SNPRINTF
+ snprintf(buf, sizeof(buf),
+#else
+ sprintf(buf,
+#endif /* HAVE_SNPRINTF */
+ "MAIL FROM: %s", from);
+ else
+#ifdef HAVE_SNPRINTF
+ snprintf(buf, sizeof(buf),
+#else
+ sprintf(buf,
+#endif /* HAVE_SNPRINTF */
+ "MAIL FROM:<%s>", from);
+ if (opts)
+#ifdef HAVE_SNPRINTF
+ snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), "%s", opts);
+#else
+ strcat(buf, opts);
+#endif /* HAVE_SNPRINTF */
+ SockPrintf(sock,"%s\r\n", buf);
+ if (outlevel >= O_MONITOR)
+ report(stdout, "%cMTP> %s\n", smtp_mode, buf);
+ ok = SMTP_ok(sock);
+ return ok;
+}
- return value: Result of SMTP_OK: based on codes in fetchmail.h.
-
- *********************************************************************/
-int SMTP_rcpt(int socket,char *to)
+int SMTP_rcpt(int sock, const char *to)
+/* send a "RCPT TO:" message to the SMTP listener */
{
int ok;
- SockPrintf(socket,"RCPT TO:<%s>\r\n", to);
- if (outlevel == O_VERBOSE)
- fprintf(stderr, "SMTP> RCPT TO:<%s>\n", to);
- ok = SMTP_ok(socket,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);
return ok;
}
-/*********************************************************************
- function: SMTP_data
- description: Send a "DATA" message to the SMTP server.
-
- arguments:
- socket TCP/IP socket for connection to SMTP
-
- *********************************************************************/
-int SMTP_data(int socket)
+int SMTP_data(int sock)
+/* send a "DATA" message to the SMTP listener */
{
int ok;
- SockPrintf(socket,"DATA\r\n");
- if (outlevel == O_VERBOSE)
- fprintf(stderr, "SMTP> DATA\n");
- ok = SMTP_ok(socket,NULL);
+ SockPrintf(sock,"DATA\r\n");
+ if (outlevel >= O_MONITOR)
+ report(stdout, "%cMTP> DATA\n", smtp_mode);
+ ok = SMTP_ok(sock);
return ok;
}
-/*********************************************************************
- function: SMTP_quit
- description: Send a "QUIT" message to the SMTP server.
-
- arguments:
- socket TCP/IP socket for connection to SMTP
-
- return value: Result of SMTP_OK: based on codes in fetchmail.h.
-
- *********************************************************************/
-int SMTP_quit(int socket)
+int SMTP_rset(int sock)
+/* send a "RSET" message to the SMTP listener */
{
int ok;
- SockPrintf(socket,"QUIT\r\n");
- if (outlevel == O_VERBOSE)
- fprintf(stderr, "SMTP> QUIT\n");
- ok = SMTP_ok(socket,NULL);
+ SockPrintf(sock,"RSET\r\n");
+ if (outlevel >= O_MONITOR)
+ report(stdout, "%cMTP> RSET\n", smtp_mode);
+ ok = SMTP_ok(sock);
return ok;
}
-/*********************************************************************
- function: SMTP_eom
- description: Send a message data termination to the SMTP server.
-
- arguments:
- socket TCP/IP socket for connection to SMTP
- return value: Result of SMTP_OK: based on codes in fetchmail.h.
-
- *********************************************************************/
-
-int SMTP_eom(int socket)
+int SMTP_quit(int sock)
+/* send a "QUIT" message to the SMTP listener */
{
int ok;
- SockPrintf(socket,".\r\n");
- if (outlevel == O_VERBOSE)
- fprintf(stderr, "SMTP> (EOM)\n");
- ok = SMTP_ok(socket,NULL);
+ SockPrintf(sock,"QUIT\r\n");
+ if (outlevel >= O_MONITOR)
+ report(stdout, "%cMTP> QUIT\n", smtp_mode);
+ ok = SMTP_ok(sock);
return ok;
}
-/*********************************************************************
- function: SMTP_rset
- description: Send a "RSET" message to the SMTP server.
-
- arguments:
- socket TCP/IP socket for connection to SMTP
-
- *********************************************************************/
-void SMTP_rset(int socket)
+int SMTP_eom(int sock)
+/* send a message data terminator to the SMTP listener */
{
- SockPrintf(socket,"RSET\r\n");
- if (outlevel == O_VERBOSE)
- fprintf(stderr, "SMTP> RSET\n");
-}
+ int ok;
-/*********************************************************************
- function: SMTP_check
- description: Returns the status of the smtp connection
- arguments:
- socket TCP/IP socket for connection to SMTP
- return value: based on codes in fetchmail.h.
- Do the dirty work of seeing what the status is..
- *********************************************************************/
-static int SMTP_check(int socket,char *argbuf)
-{
- int ok;
- char buf[SMTPBUFSIZE];
-
- if ((ok = SMTP_Gets(socket, buf, sizeof(buf)-1)) > 0) {
- buf[ok] = '\0';
- if (outlevel == O_VERBOSE)
- 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;
- }
+ SockPrintf(sock,".\r\n");
+ if (outlevel >= O_MONITOR)
+ report(stdout, "%cMTP>. (EOM)\n", smtp_mode);
+
+ /*
+ * When doing LMTP, must process many of these at the outer level.
+ */
+ if (smtp_mode == 'S')
+ ok = SMTP_ok(sock);
else
- ok = SM_UNRECOVERABLE;
- return (ok);
+ ok = SM_OK;
+
+ return ok;
}
-/*********************************************************************
- function: SMTP_ok
- description: Returns the statsus of the smtp connection
- arguments:
- socket TCP/IP socket for connection to SMTP
- return value: based on codes in fetchmail.h.
- *********************************************************************/
-int SMTP_ok(int socket,char *argbuf)
+int SMTP_ok(int sock)
+/* returns status of SMTP connection */
{
- int ok;
-
- /* 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.
-
- */
-
- ok = SMTP_check(socket,argbuf);
- if (ok == SM_ERROR) /* if we got an error, */
+ while ((SockRead(sock, smtp_response, sizeof(smtp_response)-1)) != -1)
{
- SMTP_rset(socket);
- ok = SMTP_check(socket,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 */
+ int n = strlen(smtp_response);
+
+ if (smtp_response[strlen(smtp_response)-1] == '\n')
+ smtp_response[strlen(smtp_response)-1] = '\0';
+ if (smtp_response[strlen(smtp_response)-1] == '\r')
+ smtp_response[strlen(smtp_response)-1] = '\0';
+ if (n < 4)
+ return SM_ERROR;
+ smtp_response[n] = '\0';
+ if (outlevel >= O_MONITOR)
+ report(stdout, "%cMTP< %s\n", smtp_mode, smtp_response);
+ if ((smtp_response[0] == '1' || smtp_response[0] == '2' || smtp_response[0] == '3') && smtp_response[3] == ' ')
+ return SM_OK;
+ else if (smtp_response[3] != '-')
+ return SM_ERROR;
}
- return ok;
+ return SM_UNRECOVERABLE;
}
-/*********************************************************************
- function: SMTP_Gets
- description: Gets a line from the SMTP connection
- arguments:
- socket TCP/IP socket for connection to SMTP
- return value: number of bytes read.
- *********************************************************************/
-int SMTP_Gets(int socket,char *buf,int sz)
-{
- return read(socket,buf,sz);
-}
+/* smtp.c ends here */
projects / ~andy / fetchmail / blobdiff