--- /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: IPOP3D - IMAP to POP3 conversion server
+ *
+ * Author: Mark Crispin
+ * UW Technology
+ * University of Washington
+ * Seattle, WA 98195
+ * Internet: MRC@Washington.EDU
+ *
+ * Date: 1 November 1990
+ * Last Edited: 19 February 2008
+ */
+\f
+/* 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"
+
+
+#define CRLF PSOUT ("\015\012") /* primary output terpri */
+
+
+/* Autologout timer */
+#define KODTIMEOUT 60*5
+#define LOGINTIMEOUT 60*3
+#define TIMEOUT 60*10
+
+
+/* Server states */
+
+#define AUTHORIZATION 0
+#define TRANSACTION 1
+#define UPDATE 2
+#define LOGOUT 3
+\f
+/* Eudora food */
+
+#define STATUS "Status: %s%s\015\012"
+#define SLEN (sizeof (STATUS)-3)
+
+
+/* Global storage */
+
+char *version = "104"; /* edit number of this server */
+short state = AUTHORIZATION; /* 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; /* current number of messages */
+unsigned long ndele = 0; /* number of deletes */
+unsigned long nseen = 0; /* number of mark-seens */
+unsigned long last = 0; /* highest message accessed */
+unsigned long il = 0; /* initial last message */
+char challenge[128]; /* challenge */
+char *host = NIL; /* remote host name */
+char *user = NIL; /* user name */
+char *pass = NIL; /* password */
+char *initial = NIL; /* initial response */
+long *msg = NIL; /* message translation vector */
+short *flags = NIL; /* flags */
+char *logout = "Logout";
+char *goodbye = "+OK Sayonara\015\012";
+
+
+/* POP3 flags */
+
+#define DELE 0x1
+#define SEEN 0x2
+
+
+/* Function prototypes */
+
+int main (int argc,char *argv[]);
+void sayonara (int status);
+void clkint ();
+void kodint ();
+void hupint ();
+void trmint ();
+int pass_login (char *t,int argc,char *argv[]);
+char *apop_login (char *chal,char *user,char *md5,int argc,char *argv[]);
+char *responder (void *challenge,unsigned long clen,unsigned long *rlen);
+int mbxopen (char *mailbox);
+long blat (char *text,long lines,unsigned long size,STRING *st);
+void rset ();
+\f
+/* Main program */
+
+int main (int argc,char *argv[])
+{
+ unsigned long i,j,k;
+ char *s,*t;
+ char tmp[MAILTMPLEN];
+ time_t autologouttime;
+ char *pgmname = (argc && argv[0]) ?
+ (((s = strrchr (argv[0],'/')) || (s = strrchr (argv[0],'\\'))) ?
+ s+1 : argv[0]) : "ipop3d";
+ /* set service name before linkage */
+ mail_parameters (NIL,SET_SERVICENAME,(void *) "pop");
+#include "linkage.c"
+ /* initialize server */
+ server_init (pgmname,"pop3","pop3s",clkint,kodint,hupint,trmint,NIL);
+ mail_parameters (NIL,SET_BLOCKENVINIT,VOIDT);
+ s = myusername_full (&i); /* get user name and flags */
+ mail_parameters (NIL,SET_BLOCKENVINIT,NIL);
+ if (i == MU_LOGGEDIN) { /* allow EXTERNAL if logged in already */
+ mail_parameters (NIL,UNHIDE_AUTHENTICATOR,(void *) "EXTERNAL");
+ mail_parameters (NIL,SET_EXTERNALAUTHID,(void *) s);
+ }
+ { /* set up MD5 challenge */
+ AUTHENTICATOR *auth = mail_lookup_auth (1);
+ while (auth && compare_cstring (auth->name,"CRAM-MD5")) auth = auth->next;
+ /* build challenge -- less than 128 chars */
+ if (auth && auth->server && !(auth->flags & AU_DISABLE))
+ sprintf (challenge,"<%lx.%lx@%.64s>",(unsigned long) getpid (),
+ (unsigned long) time (0),tcp_serverhost ());
+ else challenge[0] = '\0'; /* no MD5 authentication */
+ }
+ /* There are reports of POP3 clients which get upset if anything appears
+ * between the "+OK" and the "POP3" in the greeting.
+ */
+ PSOUT ("+OK POP3 ");
+ if (!challenge[0]) { /* if no MD5 enable, output host name */
+ PSOUT (tcp_serverhost ());
+ PBOUT (' ');
+ }
+ PSOUT (CCLIENTVERSION);
+ PBOUT ('.');
+ PSOUT (version);
+ PSOUT (" server ready");
+ if (challenge[0]) { /* if MD5 enable, output challenge here */
+ PBOUT (' ');
+ PSOUT (challenge);
+ }
+ CRLF;
+ PFLUSH (); /* dump output buffer */
+ autologouttime = time (0) + LOGINTIMEOUT;
+ /* command processing loop */
+ while ((state != UPDATE) && (state != LOGOUT)) {
+ idletime = time (0); /* get a command under timeout */
+ alarm ((state == TRANSACTION) ? TIMEOUT : LOGINTIMEOUT);
+ clearerr (stdin); /* clear stdin errors */
+ /* read command line */
+ while (!PSIN (tmp,MAILTMPLEN)) {
+ /* ignore if some interrupt */
+ 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 = tmp,"%.80s, while reading line",e);
+ goodbye = NIL;
+ rset (); /* try to gracefully close the stream */
+ if (state == TRANSACTION) mail_close (stream);
+ stream = NIL;
+ state = LOGOUT;
+ sayonara (1);
+ }
+ }
+ alarm (0); /* make sure timeout disabled */
+ idletime = 0; /* no longer idle */
+\f
+ if (!strchr (tmp,'\012')) /* find end of line */
+ PSOUT ("-ERR Command line too long\015\012");
+ else if (!(s = strtok (tmp," \015\012")))
+ PSOUT ("-ERR Null command\015\012");
+ else { /* dispatch based on command */
+ ucase (s); /* canonicalize case */
+ /* snarf argument */
+ t = strtok (NIL,"\015\012");
+ /* QUIT command always valid */
+ if (!strcmp (s,"QUIT")) state = UPDATE;
+ else if (!strcmp (s,"CAPA")) {
+ AUTHENTICATOR *auth;
+ PSOUT ("+OK Capability list follows:\015\012");
+ PSOUT ("TOP\015\012LOGIN-DELAY 180\015\012UIDL\015\012");
+ if (s = ssl_start_tls (NIL)) fs_give ((void **) &s);
+ else PSOUT ("STLS\015\012");
+ if (i = !mail_parameters (NIL,GET_DISABLEPLAINTEXT,NIL))
+ PSOUT ("USER\015\012");
+ /* display secure server authenticators */
+ for (auth = mail_lookup_auth (1), s = "SASL"; auth; auth = auth->next)
+ if (auth->server && !(auth->flags & AU_DISABLE) &&
+ !(auth->flags & AU_HIDE) && (i || (auth->flags & AU_SECURE))) {
+ if (s) {
+ PSOUT (s);
+ s = NIL;
+ }
+ PBOUT (' ');
+ PSOUT (auth->name);
+ }
+ PSOUT (s ? ".\015\012" : "\015\012.\015\012");
+ }
+\f
+ else switch (state) { /* else dispatch based on state */
+ case AUTHORIZATION: /* waiting to get logged in */
+ if (!strcmp (s,"AUTH")) {
+ if (t && *t) { /* mechanism given? */
+ if (host) fs_give ((void **) &host);
+ if (user) fs_give ((void **) &user);
+ if (pass) fs_give ((void **) &pass);
+ s = strtok (t," "); /* get mechanism name */
+ /* get initial response */
+ if (initial = strtok (NIL,"\015\012")) {
+ if ((*initial == '=') && !initial[1]) ++initial;
+ else if (!*initial) initial = NIL;
+ }
+ if (!(user = cpystr (mail_auth (s,responder,argc,argv)))) {
+ PSOUT ("-ERR Bad authentication\015\012");
+ syslog (LOG_INFO,"AUTHENTICATE %s failure host=%.80s",s,
+ tcp_clienthost ());
+ }
+ else if ((state = mbxopen ("INBOX")) == TRANSACTION)
+ syslog (LOG_INFO,"Auth user=%.80s host=%.80s nmsgs=%lu/%lu",
+ user,tcp_clienthost (),nmsgs,stream->nmsgs);
+ else syslog (LOG_INFO,"Auth user=%.80s host=%.80s no mailbox",
+ user,tcp_clienthost ());
+ }
+ else {
+ AUTHENTICATOR *auth;
+ PSOUT ("+OK Supported authentication mechanisms:\015\012");
+ i = !mail_parameters (NIL,GET_DISABLEPLAINTEXT,NIL);
+ for (auth = mail_lookup_auth (1); auth; auth = auth->next)
+ if (auth->server && !(auth->flags & AU_DISABLE) &&
+ !(auth->flags & AU_HIDE) &&
+ (i || (auth->flags & AU_SECURE))) {
+ PSOUT (auth->name);
+ CRLF;
+ }
+ PBOUT ('.');
+ CRLF;
+ }
+ }
+\f
+ else if (!strcmp (s,"APOP")) {
+ if (challenge[0]) { /* can do it if have an MD5 challenge */
+ if (host) fs_give ((void **) &host);
+ if (user) fs_give ((void **) &user);
+ if (pass) fs_give ((void **) &pass);
+ /* get user name */
+ if (!(t && *t && (s = strtok (t," ")) && (t = strtok(NIL,"\012"))))
+ PSOUT ("-ERR Missing APOP argument\015\012");
+ else if (!(user = apop_login (challenge,s,t,argc,argv)))
+ PSOUT ("-ERR Bad APOP\015\012");
+ else if ((state = mbxopen ("INBOX")) == TRANSACTION)
+ syslog (LOG_INFO,"APOP user=%.80s host=%.80s nmsgs=%lu/%lu",
+ user,tcp_clienthost (),nmsgs,stream->nmsgs);
+ else syslog (LOG_INFO,"APOP user=%.80s host=%.80s no mailbox",
+ user,tcp_clienthost ());
+ }
+ else PSOUT ("-ERR Not supported\015\012");
+ }
+ /* (chuckle) */
+ else if (!strcmp (s,"RPOP"))
+ PSOUT ("-ERR Nice try, bunkie\015\012");
+ else if (!strcmp (s,"STLS")) {
+ if (t = ssl_start_tls (pgmname)) {
+ PSOUT ("-ERR STLS failed: ");
+ PSOUT (t);
+ CRLF;
+ }
+ else PSOUT ("+OK STLS completed\015\012");
+ }
+ else if (!mail_parameters (NIL,GET_DISABLEPLAINTEXT,NIL) &&
+ !strcmp (s,"USER")) {
+ if (host) fs_give ((void **) &host);
+ if (user) fs_give ((void **) &user);
+ if (pass) fs_give ((void **) &pass);
+ if (t && *t) { /* if user name given */
+ /* skip leading whitespace (bogus clients!) */
+ while (*t == ' ') ++t;
+ /* remote user name? */
+ if (s = strchr (t,':')) {
+ *s++ = '\0'; /* tie off host name */
+ host = cpystr (t);/* copy host name */
+ user = cpystr (s);/* copy user name */
+ }
+ /* local user name */
+ else user = cpystr (t);
+ PSOUT ("+OK User name accepted, password please\015\012");
+ }
+ else PSOUT ("-ERR Missing username argument\015\012");
+ }
+ else if (!mail_parameters (NIL,GET_DISABLEPLAINTEXT,NIL) &&
+ user && *user && !strcmp (s,"PASS"))
+ state = pass_login (t,argc,argv);
+ else PSOUT ("-ERR Unknown AUTHORIZATION state command\015\012");
+ break;
+\f
+ case TRANSACTION: /* logged in */
+ if (!strcmp (s,"STAT")) {
+ for (i = 1,j = 0,k = 0; i <= nmsgs; i++)
+ /* message still exists? */
+ if (msg[i] && !(flags[i] & DELE)) {
+ j++; /* count one more undeleted message */
+ k += mail_elt (stream,msg[i])->rfc822_size + SLEN;
+ }
+ sprintf (tmp,"+OK %lu %lu\015\012",j,k);
+ PSOUT (tmp);
+ }
+ else if (!strcmp (s,"LIST")) {
+ if (t && *t) { /* argument do single message */
+ if ((i = strtoul (t,NIL,10)) && (i <= nmsgs) && msg[i] &&
+ !(flags[i] & DELE)) {
+ sprintf (tmp,"+OK %lu %lu\015\012",i,
+ mail_elt(stream,msg[i])->rfc822_size + SLEN);
+ PSOUT (tmp);
+ }
+ else PSOUT ("-ERR No such message\015\012");
+ }
+ else { /* entire mailbox */
+ PSOUT ("+OK Mailbox scan listing follows\015\012");
+ for (i = 1,j = 0,k = 0; i <= nmsgs; i++)
+ if (msg[i] && !(flags[i] & DELE)) {
+ sprintf (tmp,"%lu %lu\015\012",i,
+ mail_elt (stream,msg[i])->rfc822_size + SLEN);
+ PSOUT (tmp);
+ }
+ PBOUT ('.'); /* end of list */
+ CRLF;
+ }
+ }
+ else if (!strcmp (s,"UIDL")) {
+ if (t && *t) { /* argument do single message */
+ if ((i = strtoul (t,NIL,10)) && (i <= nmsgs) && msg[i] &&
+ !(flags[i] & DELE)) {
+ sprintf (tmp,"+OK %lu %08lx%08lx\015\012",i,stream->uid_validity,
+ mail_uid (stream,msg[i]));
+ PSOUT (tmp);
+ }
+ else PSOUT ("-ERR No such message\015\012");
+ }
+ else { /* entire mailbox */
+ PSOUT ("+OK Unique-ID listing follows\015\012");
+ for (i = 1,j = 0,k = 0; i <= nmsgs; i++)
+ if (msg[i] && !(flags[i] & DELE)) {
+ sprintf (tmp,"%lu %08lx%08lx\015\012",i,stream->uid_validity,
+ mail_uid (stream,msg[i]));
+ PSOUT (tmp);
+ }
+ PBOUT ('.'); /* end of list */
+ CRLF;
+ }
+ }
+\f
+ else if (!strcmp (s,"RETR")) {
+ if (t && *t) { /* must have an argument */
+ if ((i = strtoul (t,NIL,10)) && (i <= nmsgs) && msg[i] &&
+ !(flags[i] & DELE)) {
+ MESSAGECACHE *elt;
+ /* update highest message accessed */
+ if (i > last) last = i;
+ sprintf (tmp,"+OK %lu octets\015\012",
+ (elt = mail_elt (stream,msg[i]))->rfc822_size + SLEN);
+ PSOUT (tmp);
+ /* if not marked seen or noted to be marked */
+ if (!(elt->seen || (flags[i] & SEEN))) {
+ ++nseen; /* note that we need to mark it seen */
+ flags[i] |= SEEN;
+ }
+ /* get header */
+ t = mail_fetch_header (stream,msg[i],NIL,NIL,&k,FT_PEEK);
+ blat (t,-1,k,NIL);/* write up to trailing CRLF */
+ /* build status */
+ sprintf (tmp,STATUS,elt->seen ? "R" : " ",
+ elt->recent ? " " : "O");
+ if (k < 4) CRLF; /* don't write Status: if no header */
+ /* normal header ending with CRLF CRLF? */
+ else if (t[k-3] == '\012') {
+ PSOUT (tmp); /* write status */
+ CRLF; /* then write second CRLF */
+ }
+ else { /* abnormal - no blank line at end of header */
+ CRLF; /* write CRLF first then */
+ PSOUT (tmp);
+ }
+ /* output text */
+ t = mail_fetch_text (stream,msg[i],NIL,&k,
+ FT_RETURNSTRINGSTRUCT | FT_PEEK);
+ if (k) { /* only if there is a text body */
+ blat (t,-1,k,&stream->private.string);
+ CRLF; /* end of list */
+ }
+ PBOUT ('.');
+ CRLF;
+ }
+ else PSOUT ("-ERR No such message\015\012");
+ }
+ else PSOUT ("-ERR Missing message number argument\015\012");
+ }
+\f
+ else if (!strcmp (s,"DELE")) {
+ if (t && *t) { /* must have an argument */
+ if ((i = strtoul (t,NIL,10)) && (i <= nmsgs) && msg[i] &&
+ !(flags[i] & DELE)) {
+ /* update highest message accessed */
+ if (i > last) last = i;
+ flags[i] |= DELE; /* note that deletion is requested */
+ PSOUT ("+OK Message deleted\015\012");
+ ++ndele; /* one more message deleted */
+ }
+ else PSOUT ("-ERR No such message\015\012");
+ }
+ else PSOUT ("-ERR Missing message number argument\015\012");
+ }
+ else if (!strcmp (s,"NOOP"))
+ PSOUT ("+OK No-op to you too!\015\012");
+ else if (!strcmp (s,"LAST")) {
+ sprintf (tmp,"+OK %lu\015\012",last);
+ PSOUT (tmp);
+ }
+ else if (!strcmp (s,"RSET")) {
+ rset (); /* reset the mailbox */
+ PSOUT ("+OK Reset state\015\012");
+ }
+\f
+ else if (!strcmp (s,"TOP")) {
+ if (t && *t && (i =strtoul (t,&s,10)) && (i <= nmsgs) && msg[i] &&
+ !(flags[i] & DELE)) {
+ /* skip whitespace */
+ while (*s == ' ') s++;
+ /* make sure line count argument good */
+ if ((*s >= '0') && (*s <= '9')) {
+ MESSAGECACHE *elt = mail_elt (stream,msg[i]);
+ j = strtoul (s,NIL,10);
+ /* update highest message accessed */
+ if (i > last) last = i;
+ PSOUT ("+OK Top of message follows\015\012");
+ /* get header */
+ t = mail_fetch_header (stream,msg[i],NIL,NIL,&k,FT_PEEK);
+ blat (t,-1,k,NIL);/* write up to trailing CRLF */
+ /* build status */
+ sprintf (tmp,STATUS,elt->seen ? "R" : " ",
+ elt->recent ? " " : "O");
+ if (k < 4) CRLF; /* don't write Status: if no header */
+ /* normal header ending with CRLF CRLF? */
+ else if (t[k-3] == '\012') {
+ PSOUT (tmp); /* write status */
+ CRLF; /* then write second CRLF */
+ }
+ else { /* abnormal - no blank line at end of header */
+ CRLF; /* write CRLF first then */
+ PSOUT (tmp);
+ }
+ if (j) { /* want any text lines? */
+ /* output text */
+ t = mail_fetch_text (stream,msg[i],NIL,&k,
+ FT_PEEK | FT_RETURNSTRINGSTRUCT);
+ /* tie off final line if full text output */
+ if (k && (j -= blat (t,j,k,&stream->private.string))) CRLF;
+ }
+ PBOUT ('.'); /* end of list */
+ CRLF;
+ }
+ else PSOUT ("-ERR Bad line count argument\015\012");
+ }
+ else PSOUT ("-ERR Bad message number argument\015\012");
+ }
+\f
+ else if (!strcmp (s,"XTND"))
+ PSOUT ("-ERR Sorry I can't do that\015\012");
+ else PSOUT ("-ERR Unknown TRANSACTION state command\015\012");
+ break;
+ default:
+ PSOUT ("-ERR Server in unknown state\015\012");
+ break;
+ }
+ }
+ PFLUSH (); /* make sure output finished */
+ if (autologouttime) { /* have an autologout in effect? */
+ /* cancel if no longer waiting for login */
+ if (state != AUTHORIZATION) autologouttime = 0;
+ /* took too long to login */
+ else if (autologouttime < time (0)) {
+ goodbye = "-ERR Autologout\015\012";
+ logout = "Autologout";
+ state = LOGOUT; /* sayonara */
+ }
+ }
+ }
+\f
+ /* open and need to update? */
+ if (stream && (state == UPDATE)) {
+ if (nseen) { /* only bother if messages need marking seen */
+ *(s = tmp) = '\0'; /* clear sequence */
+ for (i = 1; i <= nmsgs; ++i) if (flags[i] & SEEN) {
+ for (j = i + 1, k = 0; (j <= nmsgs) && (flags[j] & SEEN); ++j) k = j;
+ if (k) sprintf (s,",%lu:%lu",i,k);
+ else sprintf (s,",%lu",i);
+ s += strlen (s); /* point to end of string */
+ if ((s - tmp) > (MAILTMPLEN - 30)) {
+ mail_setflag (stream,tmp + 1,"\\Seen");
+ *(s = tmp) = '\0'; /* restart sequence */
+ }
+ i = j; /* continue after the range */
+ }
+ if (tmp[0]) mail_setflag (stream,tmp + 1,"\\Seen");
+ }
+ if (ndele) { /* any messages to delete? */
+ *(s = tmp) = '\0'; /* clear sequence */
+ for (i = 1; i <= nmsgs; ++i) if (flags[i] & DELE) {
+ for (j = i + 1, k = 0; (j <= nmsgs) && (flags[j] & DELE); ++j) k = j;
+ if (k) sprintf (s,",%lu:%lu",i,k);
+ else sprintf (s,",%lu",i);
+ s += strlen (s); /* point to end of string */
+ if ((s - tmp) > (MAILTMPLEN - 30)) {
+ mail_setflag (stream,tmp + 1,"\\Deleted");
+ *(s = tmp) = '\0'; /* restart sequence */
+ }
+ i = j; /* continue after the range */
+ }
+ if (tmp[0]) mail_setflag (stream,tmp + 1,"\\Deleted");
+ mail_expunge (stream);
+ }
+ syslog (LOG_INFO,"Update user=%.80s host=%.80s nmsgs=%lu ndele=%lu nseen=%lu",
+ user,tcp_clienthost (),stream->nmsgs,ndele,nseen);
+ 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? */
+ PSOUT (goodbye);
+ PFLUSH (); /* 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 = "-ERR Autologout; idle for too long\015\012";
+ logout = "Autologout";
+ if (critical) state = LOGOUT; /* badly hosed if in critical code */
+ else { /* try to gracefully close the stream */
+ if ((state == TRANSACTION) && !stream->lock) {
+ rset ();
+ mail_close (stream);
+ }
+ state = LOGOUT;
+ stream = NIL;
+ sayonara (1);
+ }
+}
+
+
+/* Kiss Of Death interrupt
+ */
+
+void kodint ()
+{
+ /* only if idle */
+ 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 = "-ERR Received Kiss of Death\015\012";
+ logout = "Killed (lost mailbox lock)";
+ if (critical) state =LOGOUT;/* must defer if in critical code */
+ else { /* try to gracefully close the stream */
+ if ((state == TRANSACTION) && !stream->lock) {
+ rset ();
+ mail_close (stream);
+ }
+ state = LOGOUT;
+ 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; /* nobody left to talk to */
+ logout = "Hangup";
+ if (critical) state = LOGOUT; /* must defer if in critical code */
+ else { /* try to gracefully close the stream */
+ if ((state == TRANSACTION) && !stream->lock) {
+ rset ();
+ mail_close (stream);
+ }
+ state = LOGOUT;
+ 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 = "-ERR Killed\015\012";
+ logout = "Killed";
+ if (critical) state = LOGOUT; /* must defer if in critical code */
+ /* 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 PASS command
+ * Accepts: pointer to command argument
+ * Returns: new state
+ */
+
+int pass_login (char *t,int argc,char *argv[])
+{
+ char tmp[MAILTMPLEN];
+ /* flush old passowrd */
+ if (pass) fs_give ((void **) &pass);
+ if (!(t && *t)) { /* if no password given */
+ PSOUT ("-ERR Missing password argument\015\012");
+ return AUTHORIZATION;
+ }
+ pass = cpystr (t); /* copy password argument */
+ if (!host) { /* want remote mailbox? */
+ /* no, delimit user from possible admin */
+ if (t = strchr (user,'*')) *t++ ='\0';
+ /* attempt the login */
+ if (server_login (user,pass,t,argc,argv)) {
+ int ret = mbxopen ("INBOX");
+ if (ret == TRANSACTION) /* mailbox opened OK? */
+ syslog (LOG_INFO,"%sLogin user=%.80s host=%.80s nmsgs=%lu/%lu",
+ t ? "Admin " : "",user,tcp_clienthost (),nmsgs,stream->nmsgs);
+ else syslog (LOG_INFO,"%sLogin user=%.80s host=%.80s no mailbox",
+ t ? "Admin " : "",user,tcp_clienthost ());
+ return ret;
+ }
+ }
+#ifndef DISABLE_POP_PROXY
+ /* remote; build remote INBOX */
+ else if (anonymous_login (argc,argv)) {
+ syslog (LOG_INFO,"IMAP login to host=%.80s user=%.80s host=%.80s",host,
+ user,tcp_clienthost ());
+ sprintf (tmp,"{%.128s/user=%.128s}INBOX",host,user);
+ /* disable rimap just in case */
+ mail_parameters (NIL,SET_RSHTIMEOUT,0);
+ return mbxopen (tmp);
+ }
+#endif
+ /* vague error message to confuse crackers */
+ PSOUT ("-ERR Bad login\015\012");
+ return AUTHORIZATION;
+}
+\f
+/* Authentication responder
+ * Accepts: challenge
+ * length of challenge
+ * pointer to response length return location if non-NIL
+ * Returns: response
+ */
+
+#define RESPBUFLEN 8*MAILTMPLEN
+
+char *responder (void *challenge,unsigned long clen,unsigned long *rlen)
+{
+ unsigned long i,j;
+ unsigned char *t,resp[RESPBUFLEN];
+ char tmp[MAILTMPLEN];
+ if (initial) { /* initial response given? */
+ if (clen) return NIL; /* not permitted */
+ /* set up response */
+ t = (unsigned char *) initial;
+ initial = NIL; /* no more initial response */
+ return (char *) rfc822_base64 (t,strlen ((char *) t),rlen ? rlen : &i);
+ }
+ PSOUT ("+ ");
+ for (t = rfc822_binary (challenge,clen,&i),j = 0; j < i; j++)
+ if (t[j] > ' ') PBOUT (t[j]);
+ fs_give ((void **) &t);
+ CRLF;
+ PFLUSH (); /* dump output buffer */
+ resp[RESPBUFLEN-1] = '\0'; /* last buffer character is guaranteed NUL */
+ alarm (LOGINTIMEOUT); /* get a response under timeout */
+ clearerr (stdin); /* clear stdin errors */
+ /* read buffer */
+ while (!PSIN ((char *) resp,RESPBUFLEN)) {
+ /* ignore if some interrupt */
+ if (ferror (stdin) && (errno == EINTR)) clearerr (stdin);
+ else {
+ char *e = ferror (stdin) ?
+ strerror (errno) : "Command stream end of file";
+ alarm (0); /* disable all interrupts */
+ server_init (NIL,NIL,NIL,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN);
+ sprintf (logout = tmp,"%.80s, while reading authentication",e);
+ goodbye = NIL;
+ state = LOGOUT;
+ sayonara (1);
+ }
+ }
+ if (!(t = (unsigned char *) strchr ((char *) resp,'\012'))) {
+ int c;
+ while ((c = PBIN ()) != '\012') if (c == EOF) {
+ /* ignore if some interrupt */
+ if (ferror (stdin) && (errno == EINTR)) clearerr (stdin);
+ else {
+ char *e = ferror (stdin) ?
+ strerror (errno) : "Command stream end of file";
+ alarm (0); /* disable all interrupts */
+ server_init (NIL,NIL,NIL,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN,SIG_IGN);
+ sprintf (logout = tmp,"%.80s, while reading auth char",e);
+ goodbye = NIL;
+ state = LOGOUT;
+ sayonara (1);
+ }
+ }
+ return NIL;
+ }
+ alarm (0); /* make sure timeout disabled */
+ if (t[-1] == '\015') --t; /* remove CR */
+ *t = '\0'; /* tie off buffer */
+ return (resp[0] != '*') ?
+ (char *) rfc822_base64 (resp,t-resp,rlen ? rlen : &i) : NIL;
+}
+\f
+/* Select mailbox
+ * Accepts: mailbox name
+ * Returns: new state
+ */
+
+int mbxopen (char *mailbox)
+{
+ unsigned long i,j;
+ char tmp[MAILTMPLEN];
+ MESSAGECACHE *elt;
+ if (msg) fs_give ((void **) &msg);
+ /* open mailbox */
+ if (!(stream = mail_open (stream,mailbox,NIL)))
+ goodbye = "-ERR Unable to open user's INBOX\015\012";
+ else if (stream->rdonly) /* make sure not readonly */
+ goodbye = "-ERR Can't get lock. Mailbox in use\015\012";
+ else {
+ nmsgs = 0; /* no messages yet */
+ if (j = stream->nmsgs) { /* if mailbox non-empty */
+ sprintf (tmp,"1:%lu",j); /* fetch fast information for all messages */
+ mail_fetch_fast (stream,tmp,NIL);
+ }
+ /* create 1-origin tables */
+ msg = (long *) fs_get (++j * sizeof (long));
+ flags = (short *) fs_get (j * sizeof (short));
+ /* build map */
+ for (i = 1; i < j; ++i) if (!(elt = mail_elt (stream,i))->deleted) {
+ msg[++nmsgs] = i; /* note the presence of this message */
+ if (elt->seen) il = nmsgs;/* and set up initial LAST */
+ }
+ /* make sure unused map entries are zero */
+ for (i = nmsgs + 1; i < j; ++i) msg[i] = 0;
+ rset (); /* do implicit RSET */
+ sprintf (tmp,"+OK Mailbox open, %lu messages\015\012",nmsgs);
+ PSOUT (tmp);
+ return TRANSACTION;
+ }
+ syslog (LOG_INFO,"Error opening or locking INBOX user=%.80s host=%.80s",
+ user,tcp_clienthost ());
+ return UPDATE;
+}
+\f
+/* Blat a string with dot checking
+ * Accepts: string
+ * maximum number of lines if greater than zero
+ * maximum number of bytes to output
+ * alternative stringstruct
+ * Returns: number of lines output
+ *
+ * This routine is uglier and kludgier than it should be, just to be robust
+ * in the case of a message which doesn't end in a newline. Yes, this routine
+ * does truncate the last two bytes from the text. Since it is normally a
+ * newline and the main routine adds it back, it usually does not make a
+ * difference. But if it isn't, since the newline is required and the octet
+ * counts have to match, there's no choice but to truncate.
+ */
+
+long blat (char *text,long lines,unsigned long size,STRING *st)
+{
+ char c,d,e;
+ long ret = 0;
+ /* no-op if zero lines or empty string */
+ if (!(lines && (size-- > 2))) return 0;
+ if (text) {
+ c = *text++; d = *text++; /* collect first two bytes */
+ if (c == '.') PBOUT ('.'); /* double string-leading dot if necessary */
+ while (lines && --size) { /* copy loop */
+ e = *text++; /* get next byte */
+ PBOUT (c); /* output character */
+ if (c == '\012') { /* end of line? */
+ ret++; --lines; /* count another line */
+ /* double leading dot as necessary */
+ if (lines && size && (d == '.')) PBOUT ('.');
+ }
+ c = d; d = e; /* move to next character */
+ }
+ }
+ else {
+ c = SNX (st); d = SNX (st); /* collect first two bytes */
+ if (c == '.') PBOUT ('.'); /* double string-leading dot if necessary */
+ while (lines && --size) { /* copy loop */
+ e = SNX (st); /* get next byte */
+ PBOUT (c); /* output character */
+ if (c == '\012') { /* end of line? */
+ ret++; --lines; /* count another line */
+ /* double leading dot as necessary */
+ if (lines && size && (d == '.')) PBOUT ('.');
+ }
+ c = d; d = e; /* move to next character */
+ }
+ }
+ return ret;
+}
+\f
+/* Reset mailbox
+ */
+
+void rset ()
+{
+ /* clear all flags */
+ if (flags) memset ((void *) flags,0,(nmsgs + 1) * sizeof (short));
+ ndele = nseen = 0; /* no more deleted or seen messages */
+ last = il; /* restore previous LAST value */
+}
+\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)
+{
+ unsigned long i = number + 1;
+ msg[number] = 0; /* I bet that this will annoy someone */
+ while (i <= nmsgs) --msg[i++];
+}
+
+
+/* Message flag status change
+ * 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 != UPDATE) {
+ 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);
+ goodbye = NIL;
+ state = LOGOUT;
+ 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);
+ if (pass) {
+ strncpy (password,pass,255);/* and password */
+ fs_give ((void **) &pass);
+ }
+ else memset (password,0,256); /* no password to send, abort login */
+ 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