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/* Copyright 1993-95 by Carl Harris, Jr.
* All rights reserved
*
* Distribute freely, except: don't remove my name from the source or
* documentation (don't take credit for my work), mark your changes (don't
* get me blamed for your possible bugs), don't alter or remove this
* notice. May be sold if buildable source is provided to buyer. No
* warrantee of any kind, express or implied, is included with this
* software; use at your own risk, responsibility for damages (if any) to
* anyone resulting from the use of this software rests entirely with the
* user.
*
* Send bug reports, bug fixes, enhancements, requests, flames, etc., and
* I'll try to keep a version up to date. I can be reached as follows:
* Carl Harris <ceharris@mal.com>
*/
/***********************************************************************
module: pop3.c
project: popclient
programmer: Carl Harris, ceharris@mal.com
description: POP3 client code.
$Log: pop3.c,v $
Revision 1.1 1996/06/24 18:56:35 esr
Initial revision
Revision 1.6 1995/08/14 18:36:42 ceharris
Patches to support POP3's LAST command.
Final revisions for beta3 release.
Revision 1.5 1995/08/10 00:32:38 ceharris
Preparation for 3.0b3 beta release:
- added code for --kill/--keep, --limit, --protocol, --flush
options; --pop2 and --pop3 options now obsoleted by --protocol.
- added support for APOP authentication, including --with-APOP
argument for configure.
- provisional and broken support for RPOP
- added buffering to SockGets and SockRead functions.
- fixed problem of command-line options not being correctly
carried into the merged options record.
Revision 1.4 1995/08/09 01:32:54 ceharris
Version 3.0 beta 2 release.
Added
- .poprc functionality
- GNU long options
- multiple servers on the command line.
Fixed
- Passwords showing up in ps output.
Revision 1.3 1995/08/08 01:01:24 ceharris
Added GNU-style long options processing.
Fixed password in 'ps' output problem.
Fixed various RCS tag blunders.
Integrated .poprc parser, lexer, etc into Makefile processing.
***********************************************************************/
#include <config.h>
#include <stdio.h>
#if defined(STDC_HEADERS)
#include <string.h>
#endif
#if defined(HAVE_UNISTD_H)
#include <unistd.h>
#endif
#include <sys/time.h>
#include <ctype.h>
#include <errno.h>
#include "socket.h"
#include "popclient.h"
#define POP3_PORT 110
#ifdef HAVE_PROTOTYPES
/* prototypes for internal functions */
int POP3_OK (char *buf, int socket);
int POP3_auth (struct optrec *options, int socket);
int POP3_sendQUIT (int socket);
int POP3_sendSTAT (int *msgcount, int socket);
int POP3_sendRETR (int msgnum, int socket);
int POP3_sendDELE (int msgnum, int socket);
int POP3_sendLAST (int *last, int socket);
int POP3_readmsg (int socket, int mboxfd, int topipe);
int POP3_BuildDigest (char *buf, struct optrec *options);
#endif
/*********************************************************************
function: doPOP3
description: retrieve messages from the specified mail server
using Post Office Protocol 3.
arguments:
servername name of server to which we'll connect.
options fully-specified options (i.e. parsed, defaults invoked,
etc).
return value: exit code from the set of PS_.* constants defined in
popclient.h
calls:
globals: reads outlevel.
*********************************************************************/
int doPOP3 (servername,options)
char *servername;
struct optrec *options;
{
int ok;
int mboxfd;
char buf [POPBUFSIZE];
int socket;
int first,number,count;
/* open the folder if we're not using the system mailbox */
if (options->foldertype != OF_SYSMBOX)
if ((mboxfd = openuserfolder(options)) < 0)
return(PS_IOERR);
/* open the socket and get the greeting */
if ((socket = Socket(servername,POP3_PORT)) < 0) {
perror("doPOP3: socket");
return(PS_SOCKET);
}
ok = POP3_OK(buf,socket);
if (ok != 0) {
if (ok != PS_SOCKET)
POP3_sendQUIT(socket);
close(socket);
return(ok);
}
/* print the greeting */
if (outlevel > O_SILENT && outlevel < O_VERBOSE)
fprintf(stderr,"%s\n",buf);
else
;
#if defined(HAVE_APOP_SUPPORT)
/* build MD5 digest from greeting timestamp + password */
if (options->whichpop == P_APOP)
if (POP3_BuildDigest(buf,options) != 0)
return(PS_AUTHFAIL);
else
;
else
; /* not using APOP protocol this time */
#endif
/* try to get authorized */
ok = POP3_auth(options,socket);
if (ok == PS_ERROR)
ok = PS_AUTHFAIL;
if (ok != 0)
goto cleanUp;
/* find out how many messages are waiting */
ok = POP3_sendSTAT(&count,socket);
if (ok != 0) {
goto cleanUp;
}
/* Ask for number of last message retrieved */
if (options->fetchall)
first = 1;
else {
ok = POP3_sendLAST(&first, socket);
if (ok != 0)
goto cleanUp;
first++;
}
/* show them how many messages we'll be downloading */
if (outlevel > O_SILENT && outlevel < O_VERBOSE)
if (first > 1)
fprintf(stderr,"%d messages in folder, %d new messages.\n",
count, count - first + 1);
else
fprintf(stderr,"%d new messages in folder.\n", count);
else
;
if (count > 0) {
for (number = (options->flush || options->fetchall)? 1 : first;
number <= count;
number++) {
/* open the mail pipe if we're using the system mailbox */
if (options->foldertype == OF_SYSMBOX
&& (options->fetchall || number >= first)) {
ok = (mboxfd = openmailpipe(options)) < 0 ? -1 : 0;
if (ok != 0)
goto cleanUp;
}
if (options->flush && number < first && !options->fetchall)
ok = 0; /* no command to send here, will delete message below */
else if (options->limit)
ok = POP3_sendTOP(number,options->limit,socket);
else
ok = POP3_sendRETR(number,socket);
if (ok != 0)
goto cleanUp;
if (number >= first || options->fetchall)
ok = POP3_readmsg(socket,mboxfd,options->foldertype == OF_SYSMBOX);
else
ok = 0;
if (ok != 0)
goto cleanUp;
if ((number < first && options->flush) || !options->keep) {
if (outlevel > O_SILENT && outlevel < O_VERBOSE)
fprintf(stderr,"flushing message %d\n", number);
else
;
ok = POP3_sendDELE(number,socket);
if (ok != 0)
goto cleanUp;
}
else
; /* message is kept */
/* close the mail pipe if we're using the system mailbox */
if (options->foldertype == OF_SYSMBOX
&& (options->fetchall || number >= first)) {
ok = closemailpipe(mboxfd);
if (ok != 0)
goto cleanUp;
}
}
ok = POP3_sendQUIT(socket);
if (ok == 0)
ok = PS_SUCCESS;
close(socket);
return(ok);
}
else {
ok = POP3_sendQUIT(socket);
if (ok == 0)
ok = PS_NOMAIL;
close(socket);
return(ok);
}
cleanUp:
if (ok != 0 && ok != PS_SOCKET)
POP3_sendQUIT(socket);
if (options->foldertype != OF_SYSMBOX)
if (closeuserfolder(mboxfd) < 0 && ok == 0)
ok = PS_IOERR;
if (ok == PS_IOERR || ok == PS_SOCKET)
perror("doPOP3: cleanUp");
return(ok);
}
/*********************************************************************
function: POP3_OK
description: get the server's response to a command, and return
the extra arguments sent with the response.
arguments:
argbuf buffer to receive the argument string.
socket socket to which the server is connected.
return value: zero if okay, else return code.
calls: SockGets
globals: reads outlevel.
*********************************************************************/
int POP3_OK (argbuf,socket)
char *argbuf;
int socket;
{
int ok;
char buf [POPBUFSIZE];
char *bufp;
if (SockGets(socket, buf, sizeof(buf)) == 0) {
if (outlevel == O_VERBOSE)
fprintf(stderr,"%s\n",buf);
bufp = buf;
if (*bufp == '+' || *bufp == '-')
bufp++;
else
return(PS_PROTOCOL);
while (isalpha(*bufp))
bufp++;
*(bufp++) = '\0';
if (strcmp(buf,"+OK") == 0)
ok = 0;
else if (strcmp(buf,"-ERR") == 0)
ok = PS_ERROR;
else
ok = PS_PROTOCOL;
if (argbuf != NULL)
strcpy(argbuf,bufp);
}
else
ok = PS_SOCKET;
return(ok);
}
/*********************************************************************
function: POP3_auth
description: send the USER and PASS commands to the server, and
get the server's response.
arguments:
options merged options record.
socket socket to which the server is connected.
return value: zero if success, else status code.
calls: SockPrintf, POP3_OK.
globals: read outlevel.
*********************************************************************/
int POP3_auth (options,socket)
struct optrec *options;
int socket;
{
char buf [POPBUFSIZE];
switch (options->whichpop) {
case P_POP3:
SockPrintf(socket,"USER %s\r\n",options->userid);
if (outlevel == O_VERBOSE)
fprintf(stderr,"> USER %s\n",options->userid);
if (POP3_OK(buf,socket) != 0)
goto badAuth;
SockPrintf(socket,"PASS %s\r\n",options->password);
if (outlevel == O_VERBOSE)
fprintf(stderr,"> PASS password\n");
if (POP3_OK(buf,socket) != 0)
goto badAuth;
break;
#if defined(HAVE_APOP_SUPPORT)
case P_APOP:
SockPrintf(socket,"APOP %s %s\r\n",
options->userid, options->digest);
if (outlevel == O_VERBOSE)
fprintf(stderr,"> APOP %s %s\n",options->userid, options->digest);
if (POP3_OK(buf,socket) != 0)
goto badAuth;
break;
#endif /* HAVE_APOP_SUPPORT */
#if defined(HAVE_RPOP_SUPPORT)
case P_RPOP:
SockPrintf(socket, "RPOP %s\r\n", options->userid);
if (POP3_OK(buf,socket) != 0)
goto badAuth;
if (outlevel == O_VERBOSE)
fprintf(stderr,"> RPOP %s %s\n",options->userid);
break;
#endif /* HAVE_RPOP_SUPPORT */
default:
fprintf(stderr,"Undefined protocol request in POP3_auth\n");
}
/* we're approved */
return(0);
/*NOTREACHED*/
badAuth:
if (outlevel > O_SILENT && outlevel < O_VERBOSE)
fprintf(stderr,"%s\n",buf);
else
; /* say nothing */
return(PS_ERROR);
}
/*********************************************************************
function: POP3_sendQUIT
description: send the QUIT command to the server and close
the socket.
arguments:
socket socket to which the server is connected.
return value: none.
calls: SockPuts, POP3_OK.
globals: reads outlevel.
*********************************************************************/
int POP3_sendQUIT (socket)
int socket;
{
int ok;
char buf [POPBUFSIZE];
SockPuts(socket,"QUIT");
if (outlevel == O_VERBOSE)
fprintf(stderr,"> QUIT\n");
else
;
ok = POP3_OK(buf,socket);
if (ok != 0 && outlevel > O_SILENT && outlevel < O_VERBOSE)
fprintf(stderr,"%s\n",buf);
return(ok);
}
/*********************************************************************
function: POP3_sendSTAT
description: send the STAT command to the POP3 server to find
out how many messages are waiting.
arguments:
count pointer to an integer to receive the message count.
socket socket to which the POP3 server is connected.
return value: return code from POP3_OK.
calls: POP3_OK, SockPrintf
globals: reads outlevel.
*********************************************************************/
int POP3_sendSTAT (msgcount,socket)
int *msgcount;
int socket;
{
int ok;
char buf [POPBUFSIZE];
int totalsize;
SockPrintf(socket,"STAT\r\n");
if (outlevel == O_VERBOSE)
fprintf(stderr,"> STAT\n");
ok = POP3_OK(buf,socket);
if (ok == 0)
sscanf(buf,"%d %d",msgcount,&totalsize);
else if (outlevel > O_SILENT && outlevel < O_VERBOSE)
fprintf(stderr,"%s\n",buf);
return(ok);
}
/*********************************************************************
function: POP3_sendRETR
description: send the RETR command to the POP3 server.
arguments:
msgnum message ID number
socket socket to which the POP3 server is connected.
return value: return code from POP3_OK.
calls: POP3_OK, SockPrintf
globals: reads outlevel.
*********************************************************************/
int POP3_sendRETR (msgnum,socket)
int msgnum;
int socket;
{
int ok;
char buf [POPBUFSIZE];
SockPrintf(socket,"RETR %d\r\n",msgnum);
if (outlevel == O_VERBOSE)
fprintf(stderr,"> RETR %d\n",msgnum);
ok = POP3_OK(buf,socket);
if (ok != 0 && outlevel > O_SILENT && outlevel < O_VERBOSE)
fprintf(stderr,"%s\n",buf);
return(ok);
}
/*********************************************************************
function: POP3_sendTOP
description: send the TOP command to the POP3 server.
arguments:
msgnum message ID number
limit maximum number of message body lines to retrieve.
socket socket to which the POP3 server is connected.
return value: return code from POP3_OK.
calls: POP3_OK, SockPrintf
globals: reads outlevel.
*********************************************************************/
int POP3_sendTOP (msgnum,limit,socket)
int msgnum;
int socket;
{
int ok;
char buf [POPBUFSIZE];
SockPrintf(socket,"TOP %d %d\r\n",msgnum,limit);
if (outlevel == O_VERBOSE)
fprintf(stderr,"> TOP %d %d\n",msgnum,limit);
ok = POP3_OK(buf,socket);
if (ok != 0 && outlevel > O_SILENT && outlevel < O_VERBOSE)
fprintf(stderr,"option --limit failed; server says '%s'\n",buf);
return(ok);
}
/*********************************************************************
function: POP3_sendDELE
description: send the DELE command to the POP3 server.
arguments:
msgnum message ID number
socket socket to which the POP3 server is connected.
return value: return code from POP3_OK.
calls: POP3_OK, SockPrintF.
globals: reads outlevel.
*********************************************************************/
int POP3_sendDELE (msgnum,socket)
int msgnum;
int socket;
{
int ok;
char buf [POPBUFSIZE];
SockPrintf(socket,"DELE %d\r\n",msgnum);
if (outlevel == O_VERBOSE)
fprintf(stderr,"> DELE %d\n",msgnum);
ok = POP3_OK(buf,socket);
if (ok != 0 && outlevel > O_SILENT && outlevel < O_VERBOSE)
fprintf(stderr,"%s\n",buf);
return(ok);
}
/*********************************************************************
function: POP3_readmsg
description: Read the message content as described in RFC 1225.
arguments:
socket ... to which the server is connected.
mboxfd open file descriptor to which the retrieved message will
be written.
topipe true if we're writing to the system mailbox pipe.
return value: zero if success else PS_* return code.
calls: SockGets.
globals: reads outlevel.
*********************************************************************/
int POP3_readmsg (socket,mboxfd,topipe)
int socket;
int mboxfd;
int topipe;
{
char buf [MSGBUFSIZE];
char *bufp;
char savec;
char fromBuf[MSGBUFSIZE];
int needFrom;
int lines,sizeticker;
time_t now;
/* This keeps the retrieved message count for display purposes */
static int msgnum = 0;
/* set up for status message if outlevel allows it */
if (outlevel > O_SILENT && outlevel < O_VERBOSE) {
fprintf(stderr,"reading message %d",++msgnum);
/* won't do the '...' if retrieved messages are being sent to stdout */
if (mboxfd == 1)
fputs(".\n",stderr);
else
;
}
else
;
/* read the message content from the server */
lines = 0;
sizeticker = MSGBUFSIZE;
while (1) {
if (SockGets(socket,buf,sizeof(buf)) < 0)
return(PS_SOCKET);
bufp = buf;
if (*bufp == '.') {
bufp++;
if (*bufp == 0)
break; /* end of message */
}
strcat(bufp,"\n");
/* Check for Unix 'From' header, and a bogus one if it's not
present -- only if not using an MDA.
XXX -- should probably parse real From: header and use its
address field instead of bogus 'POPmail' string.
*/
if (!topipe && lines == 0) {
if (strlen(bufp) >= strlen("From ")) {
savec = *(bufp + 5);
*(bufp + 5) = 0;
needFrom = strcmp(bufp,"From ") != 0;
*(bufp + 5) = savec;
}
else
needFrom = 1;
if (needFrom) {
now = time(NULL);
sprintf(fromBuf,"From POPmail %s",ctime(&now));
if (write(mboxfd,fromBuf,strlen(fromBuf)) < 0) {
perror("POP3_readmsg: write");
return(PS_IOERR);
}
}
}
/* write this line to the file */
if (write(mboxfd,bufp,strlen(bufp)) < 0) {
perror("POP3_readmsg: write");
return(PS_IOERR);
}
sizeticker -= strlen(bufp);
if (sizeticker <= 0) {
if (outlevel > O_SILENT && outlevel < O_VERBOSE && mboxfd != 1)
fputc('.',stderr);
sizeticker = MSGBUFSIZE;
}
lines++;
}
if (!topipe) {
/* The server may not write the extra newline required by the Unix
mail folder format, so we write one here just in case */
if (write(mboxfd,"\n",1) < 0) {
perror("POP3_readmsg: write");
return(PS_IOERR);
}
}
else {
/* The mail delivery agent may require a terminator. Write it if
it has been defined */
#ifdef BINMAIL_TERM
if (write(mboxfd,BINMAIL_TERM,strlen(BINMAIL_TERM)) < 0) {
perror("POP3_readmsg: write");
return(PS_IOERR);
}
#endif
}
/* finish up display output */
if (outlevel == O_VERBOSE)
fprintf(stderr,"(%d lines of message content)\n",lines);
else if (outlevel > O_SILENT && mboxfd != 1)
fputs(".\n",stderr);
else
;
return(0);
}
/******************************************************************
function: POP3_sendLAST
description: send the LAST command to the server, which should
return the number of the last message number retrieved
from the server.
arguments:
last integer buffer to receive last message#
ret. value: non-zero on success, else zero.
globals: SockPrintf, POP3_OK.
calls: reads outlevel.
*****************************************************************/
int POP3_sendLAST (last, socket)
int *last;
int socket;
{
int ok;
char buf [POPBUFSIZE];
SockPrintf(socket,"LAST\r\n");
if (outlevel == O_VERBOSE)
fprintf(stderr,"> LAST\n");
ok = POP3_OK(buf,socket);
if (ok == 0 && sscanf(buf,"%d",last) == 0)
ok = PS_ERROR;
if (ok != 0 && outlevel > O_SILENT)
fprintf(stderr,"Server says '%s' to LAST command.\n",buf);
return(ok);
}
/******************************************************************
function: POP3_BuildDigest
description: Construct the MD5 digest for the current session,
using the user-specified password, and the time
stamp in the POP3 greeting.
arguments:
buf greeting string
options merged options record.
ret. value: zero on success, nonzero if no timestamp found in
greeting.
globals: none.
calls: MD5Digest.
*****************************************************************/
#if defined(HAVE_APOP_SUPPORT)
POP3_BuildDigest (buf,options)
char *buf;
struct optrec *options;
{
char *start,*end;
char *msg;
/* find start of timestamp */
for (start = buf; *start != 0 && *start != '<'; start++)
;
if (*start == 0) {
fprintf(stderr,"Required APOP timestamp not found in greeting\n");
return(-1);
}
/* find end of timestamp */
for (end = start; *end != 0 && *end != '>'; end++)
;
if (*end == 0 || (end - start - 1) == 1) {
fprintf(stderr,"Timestamp syntax error in greeting\n");
return(-1);
}
/* copy timestamp and password into digestion buffer */
msg = (char *) malloc((end-start-1) + strlen(options->password) + 1);
*(++end) = 0;
strcpy(msg,start);
strcat(msg,options->password);
strcpy(options->digest, MD5Digest(msg));
free(msg);
return(0);
}
#endif /* HAVE_APOP_SUPPORT */