--- /dev/null
+/* ========================================================================
+ * Copyright 1988-2008 University of Washington
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *
+ * ========================================================================
+ */
+
+/*
+ * Program: IPOP2D - IMAP to POP2 conversion server
+ *
+ * Author: Mark Crispin
+ * UW Technology
+ * University of Washington
+ * Seattle, WA 98195
+ * Internet: MRC@Washington.EDU
+ *
+ * Date: 28 October 1990
+ * Last Edited: 13 February 2008
+ */
+
+
+/* Parameter files */
+
+#include <stdio.h>
+#include <ctype.h>
+#include <errno.h>
+extern int errno; /* just in case */
+#include <signal.h>
+#include <time.h>
+#include "c-client.h"
+
+
+/* Autologout timer */
+#define KODTIMEOUT 60*5
+#define LOGINTIMEOUT 60*3
+#define TIMEOUT 60*30
+
+
+/* Size of temporary buffers */
+#define TMPLEN 1024
+
+
+/* Server states */
+
+#define LISN 0
+#define AUTH 1
+#define MBOX 2
+#define ITEM 3
+#define NEXT 4
+#define DONE 5
+\f
+/* Global storage */
+
+char *version = "75"; /* edit number of this server */
+short state = LISN; /* server state */
+short critical = NIL; /* non-zero if in critical code */
+MAILSTREAM *stream = NIL; /* mailbox stream */
+time_t idletime = 0; /* time we went idle */
+unsigned long nmsgs = 0; /* number of messages */
+unsigned long current = 1; /* current message number */
+unsigned long size = 0; /* size of current message */
+char status[MAILTMPLEN]; /* space for status string */
+char *user = ""; /* user name */
+char *pass = ""; /* password */
+unsigned long *msg = NIL; /* message translation vector */
+char *logout = "Logout";
+char *goodbye = "+ Sayonara\015\012";
+
+
+/* Function prototypes */
+
+int main (int argc,char *argv[]);
+void sayonara (int status);
+void clkint ();
+void kodint ();
+void hupint ();
+void trmint ();
+short c_helo (char *t,int argc,char *argv[]);
+short c_fold (char *t);
+short c_read (char *t);
+short c_retr (char *t);
+short c_acks (char *t);
+short c_ackd (char *t);
+short c_nack (char *t);
+\f
+/* Main program */
+
+int main (int argc,char *argv[])
+{
+ char *s,*t;
+ char cmdbuf[TMPLEN];
+ char *pgmname = (argc && argv[0]) ?
+ (((s = strrchr (argv[0],'/')) || (s = strrchr (argv[0],'\\'))) ?
+ s+1 : argv[0]) : "ipop2d";
+ /* set service name before linkage */
+ mail_parameters (NIL,SET_SERVICENAME,(void *) "pop");
+#include "linkage.c"
+ if (mail_parameters (NIL,GET_DISABLEPLAINTEXT,NIL)) {
+ goodbye = "- POP2 server disabled on this system\015\012";
+ sayonara (1);
+ }
+ /* initialize server */
+ server_init (pgmname,"pop",NIL,clkint,kodint,hupint,trmint,NIL);
+ /* There are reports of POP2 clients which get upset if anything appears
+ * between the "+" and the "POP2" in the greeting.
+ */
+ printf ("+ POP2 %s %s.%s server ready\015\012",tcp_serverhost (),
+ CCLIENTVERSION,version);
+ fflush (stdout); /* dump output buffer */
+ state = AUTH; /* initial server state */
+ while (state != DONE) { /* command processing loop */
+ idletime = time (0); /* get a command under timeout */
+ alarm ((state != AUTH) ? TIMEOUT : LOGINTIMEOUT);
+ clearerr (stdin); /* clear stdin errors */
+ while (!fgets (cmdbuf,TMPLEN-1,stdin)) {
+ if (ferror (stdin) && (errno == EINTR)) clearerr (stdin);
+ else {
+ char *e = ferror (stdin) ?
+ strerror (errno) : "Unexpected client disconnect";
+ alarm (0); /* disable all interrupts */
+ server_init (NIL,NIL,NIL,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN);
+ sprintf (logout = cmdbuf,"%.80s while reading line",e);
+ state = DONE;
+ stream = mail_close (stream);
+ goodbye = NIL;
+ sayonara (1);
+ }
+ }
+ alarm (0); /* make sure timeout disabled */
+ idletime = 0; /* no longer idle */
+ /* find end of line */
+ if (!strchr (cmdbuf,'\012')) {
+ server_init (NIL,NIL,NIL,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN);
+ logout = "- Command line too long\015\012";
+ state = DONE;
+ }
+ else if (!(s = strtok (cmdbuf," \015\012"))) {
+ server_init (NIL,NIL,NIL,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN);
+ goodbye = "- Missing or null command\015\012";
+ state = DONE;
+ }
+ else { /* dispatch based on command */
+ ucase (s); /* canonicalize case */
+ /* snarf argument */
+ t = strtok (NIL,"\015\012");
+ if ((state == AUTH) && !strcmp (s,"HELO")) state = c_helo (t,argc,argv);
+ else if ((state == MBOX || state == ITEM) && !strcmp (s,"FOLD"))
+ state = c_fold (t);
+ else if ((state == MBOX || state == ITEM) && !strcmp (s,"READ"))
+ state = c_read (t);
+ else if ((state == ITEM) && !strcmp (s,"RETR")) state = c_retr (t);
+ else if ((state == NEXT) && !strcmp (s,"ACKS")) state = c_acks (t);
+ else if ((state == NEXT) && !strcmp (s,"ACKD")) state = c_ackd (t);
+ else if ((state == NEXT) && !strcmp (s,"NACK")) state = c_nack (t);
+ else if ((state == AUTH || state == MBOX || state == ITEM) &&
+ !strcmp (s,"QUIT")) {
+ server_init (NIL,NIL,NIL,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN);
+ state = DONE; /* done in either case */
+ if (t) goodbye = "- Bogus argument given to QUIT\015\012";
+ else { /* expunge the stream */
+ if (stream && nmsgs) stream = mail_close_full (stream,CL_EXPUNGE);
+ stream = NIL; /* don't repeat it */
+ }
+ }
+ else { /* some other or inappropriate command */
+ server_init (NIL,NIL,NIL,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN);
+ goodbye = "- Bogus or out of sequence command\015\012";
+ state = DONE;
+ }
+ }
+ fflush (stdout); /* make sure output blatted */
+ }
+ /* clean up the stream */
+ if (stream) mail_close (stream);
+ sayonara (0);
+ return 0; /* stupid compilers */
+}
+
+
+/* Say goodbye
+ * Accepts: exit status
+ *
+ * Does not return
+ */
+
+void sayonara (int status)
+{
+ logouthook_t lgoh = (logouthook_t) mail_parameters (NIL,GET_LOGOUTHOOK,NIL);
+ if (goodbye) { /* have a goodbye message? */
+ fputs (goodbye,stdout);
+ fflush (stdout); /* make sure blatted */
+ }
+ syslog (LOG_INFO,"%s user=%.80s host=%.80s",logout,
+ user ? (char *) user : "???",tcp_clienthost ());
+ /* do logout hook if needed */
+ if (lgoh) (*lgoh) (mail_parameters (NIL,GET_LOGOUTDATA,NIL));
+ _exit (status); /* all done */
+}
+\f
+/* Clock interrupt
+ */
+
+void clkint ()
+{
+ alarm (0); /* disable all interrupts */
+ server_init (NIL,NIL,NIL,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN);
+ goodbye = "- Autologout; idle for too long\015\012";
+ logout = "Autologout";
+ state = DONE; /* mark state done in either case */
+ if (!critical) { /* badly host if in critical code */
+ if (stream && !stream->lock) mail_close (stream);
+ stream = NIL;
+ sayonara (1); /* die die die */
+ }
+}
+
+
+/* Kiss Of Death interrupt
+ */
+
+void kodint ()
+{
+ /* only if in command wait */
+ if (idletime && ((time (0) - idletime) > KODTIMEOUT)) {
+ alarm (0); /* disable all interrupts */
+ server_init (NIL,NIL,NIL,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN);
+ goodbye = "- Killed (lost mailbox lock)\015\012";
+ logout = "Killed (lost mailbox lock)";
+ state = DONE; /* mark state done in either case */
+ if (!critical) { /* badly host if in critical code */
+ if (stream && !stream->lock) mail_close (stream);
+ stream = NIL;
+ sayonara (1); /* die die die */
+ }
+ }
+}
+
+
+/* Hangup interrupt
+ */
+
+void hupint ()
+{
+ alarm (0); /* disable all interrupts */
+ server_init (NIL,NIL,NIL,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN);
+ goodbye = NIL;
+ logout = "Hangup";
+ state = DONE; /* mark state done in either case */
+ if (!critical) { /* badly host if in critical code */
+ if (stream && !stream->lock) mail_close (stream);
+ stream = NIL;
+ sayonara (1); /* die die die */
+ }
+}
+
+
+/* Termination interrupt
+ */
+
+void trmint ()
+{
+ alarm (0); /* disable all interrupts */
+ server_init (NIL,NIL,NIL,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN);
+ goodbye = "- Killed (terminated)\015\012";
+ logout = "Killed (terminated)";
+ if (critical) state = DONE; /* mark state done in either case */
+ /* Make no attempt at graceful closure since a shutdown may be in
+ * progress, and we won't have any time to do mail_close() actions.
+ */
+ else sayonara (1); /* die die die */
+}
+\f
+/* Parse HELO command
+ * Accepts: pointer to command argument
+ * Returns: new state
+ */
+
+short c_helo (char *t,int argc,char *argv[])
+{
+ char *s,*u,*p;
+ char tmp[TMPLEN];
+ if ((!(t && *t && (u = strtok (t," ")) && (p = strtok (NIL,"\015\012")))) ||
+ (strlen (p) >= TMPLEN)) { /* get user name and password */
+ fputs ("- Missing user or password\015\012",stdout);
+ return DONE;
+ }
+ /* copy password, handle quoting */
+ for (s = tmp; *p; p++) *s++ = (*p == '\\') ? *++p : *p;
+ *s = '\0'; /* tie off string */
+ pass = cpystr (tmp);
+ if (!(s = strchr (u,':'))) { /* want remote mailbox? */
+ /* no, delimit user from possible admin */
+ if (s = strchr (u,'*')) *s++ = '\0';
+ if (server_login (user = cpystr (u),pass,s,argc,argv)) {
+ syslog (LOG_INFO,"%sLogin user=%.80s host=%.80s",s ? "Admin " : "",
+ user,tcp_clienthost ());
+ return c_fold ("INBOX"); /* local; select INBOX */
+ }
+ }
+#ifndef DISABLE_POP_PROXY
+ /* can't do if can't log in as anonymous */
+ else if (anonymous_login (argc,argv)) {
+ *s++ = '\0'; /* separate host name from user name */
+ user = cpystr (s); /* note user name */
+ syslog (LOG_INFO,"IMAP login to host=%.80s user=%.80s host=%.80s",u,user,
+ tcp_clienthost ());
+ /* initially remote INBOX */
+ sprintf (tmp,"{%.128s/user=%.128s}INBOX",u,user);
+ /* disable rimap just in case */
+ mail_parameters (NIL,SET_RSHTIMEOUT,0);
+ return c_fold (tmp);
+ }
+#endif
+ fputs ("- Bad login\015\012",stdout);
+ return DONE;
+}
+\f
+/* Parse FOLD command
+ * Accepts: pointer to command argument
+ * Returns: new state
+ */
+
+short c_fold (char *t)
+{
+ unsigned long i,j,flags;
+ char *s = NIL,tmp[2*TMPLEN];
+ NETMBX mb;
+ if (!(t && *t)) { /* make sure there's an argument */
+ fputs ("- Missing mailbox name\015\012",stdout);
+ return DONE;
+ }
+ myusername_full (&flags); /* get user type flags */
+ /* expunge old stream */
+ if (stream && nmsgs) mail_expunge (stream);
+ nmsgs = 0; /* no more messages */
+ if (msg) fs_give ((void **) &msg);
+#ifndef DISABLE_POP_PROXY
+ if (flags == MU_ANONYMOUS) { /* don't permit proxy to leave IMAP */
+ if (stream) { /* not first time */
+ if (!(stream->mailbox && (s = strchr (stream->mailbox,'}'))))
+ fatal ("bad previous mailbox name");
+ strncpy (tmp,stream->mailbox,i = (++s - stream->mailbox));
+ if (i >= TMPLEN) fatal ("ridiculous network prefix");
+ strcpy (tmp+i,t); /* append mailbox to initial spec */
+ t = tmp;
+ }
+ /* must be net name first time */
+ else if (!mail_valid_net_parse (t,&mb)) fatal ("anonymous folder bogon");
+ }
+#endif
+ /* open mailbox, note # of messages */
+ if (j = (stream = mail_open (stream,t,NIL)) ? stream->nmsgs : 0) {
+ sprintf (tmp,"1:%lu",j); /* fetch fast information for all messages */
+ mail_fetch_fast (stream,tmp,NIL);
+ msg = (unsigned long *) fs_get ((stream->nmsgs + 1) *
+ sizeof (unsigned long));
+ for (i = 1; i <= j; i++) /* find undeleted messages, add to vector */
+ if (!mail_elt (stream,i)->deleted) msg[++nmsgs] = i;
+ }
+#ifndef DISABLE_POP_PROXY
+ if (!stream && (flags == MU_ANONYMOUS)) {
+ fputs ("- Bad login\015\012",stdout);
+ return DONE;
+ }
+#endif
+ printf ("#%lu messages in %s\015\012",nmsgs,stream ? stream->mailbox :
+ "<none>");
+ return MBOX;
+}
+\f
+/* Parse READ command
+ * Accepts: pointer to command argument
+ * Returns: new state
+ */
+
+short c_read (char *t)
+{
+ MESSAGECACHE *elt = NIL;
+ if (t && *t) { /* have a message number argument? */
+ /* validity check message number */
+ if (((current = strtoul (t,NIL,10)) < 1) || (current > nmsgs)) {
+ fputs ("- Invalid message number given to READ\015\012",stdout);
+ return DONE;
+ }
+ }
+ else if (current > nmsgs) { /* at end of mailbox? */
+ fputs ("=0 No more messages\015\012",stdout);
+ return MBOX;
+ }
+ /* set size if message valid and exists */
+ size = msg[current] ? (elt = mail_elt(stream,msg[current]))->rfc822_size : 0;
+ if (elt) sprintf (status,"Status: %s%s\015\012",
+ elt->seen ? "R" : " ",elt->recent ? " " : "O");
+ else status[0] = '\0'; /* no status */
+ size += strlen (status); /* update size to reflect status */
+ /* display results */
+ printf ("=%lu characters in message %lu\015\012",size + 2,current);
+ return ITEM;
+}
+
+
+/* Parse RETR command
+ * Accepts: pointer to command argument
+ * Returns: new state
+ */
+
+short c_retr (char *t)
+{
+ unsigned long i,j;
+ STRING *bs;
+ if (t) { /* disallow argument */
+ fputs ("- Bogus argument given to RETR\015\012",stdout);
+ return DONE;
+ }
+ if (size) { /* message size valid? */
+ t = mail_fetch_header (stream,msg[current],NIL,NIL,&i,FT_PEEK);
+ if (i > 2) { /* only if there is something */
+ i -= 2; /* lop off last two octets */
+ while (i) { /* blat the header */
+ if (!(j = fwrite (t,sizeof (char),i,stdout))) return DONE;
+ if (i -= j) t += j; /* advance to incomplete data */
+ }
+ }
+ fputs (status,stdout); /* yes, output message */
+ fputs ("\015\012",stdout); /* delimit header from text */
+ if (t = mail_fetch_text (stream,msg[current],NIL,&i,FT_RETURNSTRINGSTRUCT))
+ while (i) { /* blat the text */
+ if (!(j = fwrite (t,sizeof (char),i,stdout))) return DONE;
+ if (i -= j) t += j; /* advance to incomplete data */
+ }
+ else for (bs = &stream->private.string; i--; )
+ if (putc (SNX (bs),stdout) == EOF) return DONE;
+ fputs ("\015\012",stdout); /* trailer to coddle PCNFS' NFSMAIL */
+ }
+ else return DONE; /* otherwise go away */
+ return NEXT;
+}
+\f
+/* Parse ACKS command
+ * Accepts: pointer to command argument
+ * Returns: new state
+ */
+
+short c_acks (char *t)
+{
+ char tmp[TMPLEN];
+ if (t) { /* disallow argument */
+ fputs ("- Bogus argument given to ACKS\015\012",stdout);
+ return DONE;
+ }
+ /* mark message as seen */
+ sprintf (tmp,"%lu",msg[current++]);
+ mail_setflag (stream,tmp,"\\Seen");
+ return c_read (NIL); /* end message reading transaction */
+}
+
+
+/* Parse ACKD command
+ * Accepts: pointer to command argument
+ * Returns: new state
+ */
+
+short c_ackd (char *t)
+{
+ char tmp[TMPLEN];
+ if (t) { /* disallow argument */
+ fputs ("- Bogus argument given to ACKD\015\012",stdout);
+ return DONE;
+ }
+ /* mark message as seen and deleted */
+ sprintf (tmp,"%lu",msg[current]);
+ mail_setflag (stream,tmp,"\\Seen \\Deleted");
+ msg[current++] = 0; /* mark message as deleted */
+ return c_read (NIL); /* end message reading transaction */
+}
+
+
+/* Parse NACK command
+ * Accepts: pointer to command argument
+ * Returns: new state
+ */
+
+short c_nack (char *t)
+{
+ if (t) { /* disallow argument */
+ fputs ("- Bogus argument given to NACK\015\012",stdout);
+ return DONE;
+ }
+ return c_read (NIL); /* end message reading transaction */
+}
+\f
+/* Co-routines from MAIL library */
+
+
+/* Message matches a search
+ * Accepts: MAIL stream
+ * message number
+ */
+
+void mm_searched (MAILSTREAM *stream,unsigned long msgno)
+{
+ /* Never called */
+}
+
+
+/* Message exists (i.e. there are that many messages in the mailbox)
+ * Accepts: MAIL stream
+ * message number
+ */
+
+void mm_exists (MAILSTREAM *stream,unsigned long number)
+{
+ /* Can't use this mechanism. POP has no means of notifying the client of
+ new mail during the session. */
+}
+
+
+/* Message expunged
+ * Accepts: MAIL stream
+ * message number
+ */
+
+void mm_expunged (MAILSTREAM *stream,unsigned long number)
+{
+ if (state != DONE) { /* ignore if closing */
+ /* someone else screwed us */
+ goodbye = "- Mailbox expunged from under me!\015\012";
+ if (stream && !stream->lock) mail_close (stream);
+ stream = NIL;
+ sayonara (1);
+ }
+}
+
+
+/* Message status changed
+ * Accepts: MAIL stream
+ * message number
+ */
+
+void mm_flags (MAILSTREAM *stream,unsigned long number)
+{
+ /* This isn't used */
+}
+
+
+/* Mailbox found
+ * Accepts: MAIL stream
+ * hierarchy delimiter
+ * mailbox name
+ * mailbox attributes
+ */
+
+void mm_list (MAILSTREAM *stream,int delimiter,char *name,long attributes)
+{
+ /* This isn't used */
+}
+
+
+/* Subscribe mailbox found
+ * Accepts: MAIL stream
+ * hierarchy delimiter
+ * mailbox name
+ * mailbox attributes
+ */
+
+void mm_lsub (MAILSTREAM *stream,int delimiter,char *name,long attributes)
+{
+ /* This isn't used */
+}
+
+
+/* Mailbox status
+ * Accepts: MAIL stream
+ * mailbox name
+ * mailbox status
+ */
+
+void mm_status (MAILSTREAM *stream,char *mailbox,MAILSTATUS *status)
+{
+ /* This isn't used */
+}
+\f
+/* Notification event
+ * Accepts: MAIL stream
+ * string to log
+ * error flag
+ */
+
+void mm_notify (MAILSTREAM *stream,char *string,long errflg)
+{
+ mm_log (string,errflg); /* just do mm_log action */
+}
+
+
+/* Log an event for the user to see
+ * Accepts: string to log
+ * error flag
+ */
+
+void mm_log (char *string,long errflg)
+{
+ switch (errflg) {
+ case NIL: /* information message */
+ case PARSE: /* parse glitch */
+ break; /* too many of these to log */
+ case WARN: /* warning */
+ syslog (LOG_DEBUG,"%s",string);
+ break;
+ case BYE: /* driver broke connection */
+ if (state != DONE) {
+ char tmp[MAILTMPLEN];
+ alarm (0); /* disable all interrupts */
+ server_init (NIL,NIL,NIL,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN);
+ sprintf (logout = tmp,"Mailbox closed (%.80s)",string);
+ sayonara (1);
+ }
+ break;
+ case ERROR: /* error that broke command */
+ default: /* default should never happen */
+ syslog (LOG_NOTICE,"%s",string);
+ break;
+ }
+}
+
+
+/* Log an event to debugging telemetry
+ * Accepts: string to log
+ */
+
+void mm_dlog (char *string)
+{
+ /* Not doing anything here for now */
+}
+
+
+/* Get user name and password for this host
+ * Accepts: parse of network mailbox name
+ * where to return user name
+ * where to return password
+ * trial count
+ */
+
+void mm_login (NETMBX *mb,char *username,char *password,long trial)
+{
+ /* set user name */
+ strncpy (username,*mb->user ? mb->user : user,NETMAXUSER-1);
+ strncpy (password,pass,255); /* and password */
+ username[NETMAXUSER] = password[255] = '\0';
+}
+\f
+/* About to enter critical code
+ * Accepts: stream
+ */
+
+void mm_critical (MAILSTREAM *stream)
+{
+ ++critical;
+}
+
+
+/* About to exit critical code
+ * Accepts: stream
+ */
+
+void mm_nocritical (MAILSTREAM *stream)
+{
+ --critical;
+}
+
+
+/* Disk error found
+ * Accepts: stream
+ * system error code
+ * flag indicating that mailbox may be clobbered
+ * Returns: abort flag
+ */
+
+long mm_diskerror (MAILSTREAM *stream,long errcode,long serious)
+{
+ if (serious) { /* try your damnest if clobberage likely */
+ syslog (LOG_ALERT,
+ "Retrying after disk error user=%.80s host=%.80s mbx=%.80s: %.80s",
+ user,tcp_clienthost (),
+ (stream && stream->mailbox) ? stream->mailbox : "???",
+ strerror (errcode));
+ alarm (0); /* make damn sure timeout disabled */
+ sleep (60); /* give it some time to clear up */
+ return NIL;
+ }
+ syslog (LOG_ALERT,"Fatal disk error user=%.80s host=%.80s mbx=%.80s: %.80s",
+ user,tcp_clienthost (),
+ (stream && stream->mailbox) ? stream->mailbox : "???",
+ strerror (errcode));
+ return T;
+}
+
+
+/* Log a fatal error event
+ * Accepts: string to log
+ */
+
+void mm_fatal (char *string)
+{
+ mm_log (string,ERROR); /* shouldn't happen normally */
+}
projects / uw-imap / commitdiff