-/* 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
- 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"
-/*********************************************************************
- function: SMTP_helo
- description: Send a "HELO" 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_helo(int socket,char *host)
+struct opt
{
- int ok;
- char buf[SMTPBUFSIZE+1];
-
- sprintf(buf,"HELO %s",host);
- SockPuts(socket, buf);
- if (outlevel == O_VERBOSE)
- fprintf(stderr, "SMTP> %s\n", buf);
- ok = SMTP_ok(socket,buf);
- return ok;
-}
+ const char *name;
+ int value;
+};
+static struct opt extensions[] =
+{
+ {"8BITMIME", ESMTP_8BITMIME},
+ {"SIZE", ESMTP_SIZE},
+ {"ETRN", ESMTP_ETRN},
+ {(char *)NULL, 0},
+};
-/*********************************************************************
- function: SMTP_from
- description: Send a "MAIL FROM:" message to the SMTP server.
+char smtp_response[MSGBUFSIZE];
- arguments:
- socket TCP/IP socket for connection to SMTP
- from user name/host of originator
+static char smtp_mode = 'S';
- Note: these args are likely to change, as we get fancier about
- handling the names.
+void SMTP_setmode(char sl)
+/* set whether we are speaking SMTP or LMTP */
+{
+ smtp_mode = sl;
+}
- return value: Result of SMTP_ok: based on codes in fetchmail.h.
-
- *********************************************************************/
-int SMTP_from(int socket, char *from)
+int SMTP_helo(int sock,const char *host)
+/* send a "HELO" message to the SMTP listener */
{
- char buf[SMTPBUFSIZE+1]; /* it's as good as size as any... */
int ok;
- SockPrintf(socket, "MAIL FROM: %s\n", from);
- if (outlevel == O_VERBOSE)
- fprintf(stderr, "SMTP> MAIL FROM: %s\n", from);
- ok = SMTP_ok(socket,buf);
+ SockPrintf(sock,"HELO %s\r\n", host);
+ if (outlevel >= O_MONITOR)
+ report(stdout, "SMTP> HELO %s\n", host);
+ ok = SMTP_ok(sock);
return ok;
}
+int SMTP_ehlo(int sock, const char *host, int *opt)
+/* send a "EHLO" message to the SMTP listener, return extension status bits */
+{
+ struct opt *hp;
-/*********************************************************************
- function: SMTP_rcpt
- description: Send a "RCPT TO:" message to the SMTP server.
+ 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 ((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 SM_UNRECOVERABLE;
+}
- 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, '<'))
+ sprintf(buf, "MAIL FROM: %s", from);
+ else
+ sprintf(buf, "MAIL FROM:<%s>", from);
+ if (opts)
+ strcat(buf, opts);
+ 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 */
{
- char buf[SMTPBUFSIZE+1]; /* it's as good as size as any... */
int ok;
- SockPrintf(socket, "RCPT TO: %s\n", to);
- if (outlevel == O_VERBOSE)
- fprintf(stderr, "SMTP> RCPT TO: %s\n", to);
- ok = SMTP_ok(socket,buf);
-
+ 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\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_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_rset(int sock)
+/* send a "RSET" message to the SMTP listener */
{
int ok;
- SockPuts(socket,".");
- if (outlevel == O_VERBOSE)
- fprintf(stderr, "SMTP> (EOM)\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_rset
- description: Send an "RSET" message to the SMTP server.
-
- arguments:
- socket TCP/IP socket for connection to SMTP
-
- *********************************************************************/
-void SMTP_rset(int socket)
+int SMTP_quit(int sock)
+/* send a "QUIT" message to the SMTP listener */
{
- SockPrintf(socket,"RSET\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;
- }
- else
- ok = SM_UNRECOVERABLE;
- return (ok);
+ SockPrintf(sock,"QUIT\r\n");
+ if (outlevel >= O_MONITOR)
+ report(stdout, "%cMTP> QUIT\n", smtp_mode);
+ ok = SMTP_ok(sock);
+ 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_eom(int sock)
+/* send a message data terminator to the SMTP listener */
{
- int ok;
- char buf[SMTPBUFSIZE+1];
+ 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.
+ 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_OK;
- ok = SMTP_check(socket,argbuf);
- if (ok == SM_ERROR) /* if we got an error, */
- {
- 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 */
- }
return ok;
}
-/*********************************************************************
- 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)
+int SMTP_ok(int sock)
+/* returns status of SMTP connection */
{
- return read(socket,buf,sz);
+ 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, "%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 SM_UNRECOVERABLE;
}
+/* smtp.c ends here */
projects / ~andy / fetchmail / blobdiff