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+/* ========================================================================
+ * 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: Simple Mail Transfer Protocol (SMTP) routines
+ *
+ * Author: Mark Crispin
+ * Networks and Distributed Computing
+ * Computing & Communications
+ * University of Washington
+ * Administration Building, AG-44
+ * Seattle, WA 98195
+ * Internet: MRC@CAC.Washington.EDU
+ *
+ * Date: 27 July 1988
+ * Last Edited: 28 January 2008
+ *
+ * This original version of this file is
+ * Copyright 1988 Stanford University
+ * and was developed in the Symbolic Systems Resources Group of the Knowledge
+ * Systems Laboratory at Stanford University in 1987-88, and was funded by the
+ * Biomedical Research Technology Program of the National Institutes of Health
+ * under grant number RR-00785.
+ */
+
+
+#include <ctype.h>
+#include <stdio.h>
+#include "c-client.h"
+
+/* Constants */
+
+#define SMTPSSLPORT (long) 465 /* former assigned SSL TCP contact port */
+#define SMTPGREET (long) 220 /* SMTP successful greeting */
+#define SMTPAUTHED (long) 235 /* SMTP successful authentication */
+#define SMTPOK (long) 250 /* SMTP OK code */
+#define SMTPAUTHREADY (long) 334/* SMTP ready for authentication */
+#define SMTPREADY (long) 354 /* SMTP ready for data */
+#define SMTPSOFTFATAL (long) 421/* SMTP soft fatal code */
+#define SMTPWANTAUTH (long) 505 /* SMTP authentication needed */
+#define SMTPWANTAUTH2 (long) 530/* SMTP authentication needed */
+#define SMTPUNAVAIL (long) 550 /* SMTP mailbox unavailable */
+#define SMTPHARDERROR (long) 554/* SMTP miscellaneous hard failure */
+
+
+/* Convenient access to protocol-specific data */
+
+#define ESMTP stream->protocol.esmtp
+
+
+/* Function prototypes */
+
+void *smtp_challenge (void *s,unsigned long *len);
+long smtp_response (void *s,char *response,unsigned long size);
+long smtp_auth (SENDSTREAM *stream,NETMBX *mb,char *tmp);
+long smtp_rcpt (SENDSTREAM *stream,ADDRESS *adr,long *error);
+long smtp_send (SENDSTREAM *stream,char *command,char *args);
+long smtp_reply (SENDSTREAM *stream);
+long smtp_ehlo (SENDSTREAM *stream,char *host,NETMBX *mb);
+long smtp_fake (SENDSTREAM *stream,char *text);
+static long smtp_seterror (SENDSTREAM *stream,long code,char *text);
+long smtp_soutr (void *stream,char *s);
+
+/* Mailer parameters */
+
+static unsigned long smtp_maxlogintrials = MAXLOGINTRIALS;
+static long smtp_port = 0; /* default port override */
+static long smtp_sslport = 0;
+
+
+#ifndef RFC2821
+#define RFC2821 /* RFC 2821 compliance */
+#endif
+
+/* SMTP limits, current as of RFC 2821 */
+
+#define SMTPMAXLOCALPART 64
+#define SMTPMAXDOMAIN 255
+#define SMTPMAXPATH 256
+
+
+/* I have seen local parts of more than 64 octets, in spite of the SMTP
+ * limits. So, we'll have a more generous limit that's still guaranteed
+ * not to pop the buffer, and let the server worry about it. As of this
+ * writing, it comes out to 240. Anyone with a mailbox name larger than
+ * that is in serious need of a life or at least a new ISP! 23 June 1998
+ */
+
+#define MAXLOCALPART ((MAILTMPLEN - (SMTPMAXDOMAIN + SMTPMAXPATH + 32)) / 2)
+
+/* Mail Transfer Protocol manipulate driver parameters
+ * Accepts: function code
+ * function-dependent value
+ * Returns: function-dependent return value
+ */
+
+void *smtp_parameters (long function,void *value)
+{
+ switch ((int) function) {
+ case SET_MAXLOGINTRIALS:
+ smtp_maxlogintrials = (unsigned long) value;
+ break;
+ case GET_MAXLOGINTRIALS:
+ value = (void *) smtp_maxlogintrials;
+ break;
+ case SET_SMTPPORT:
+ smtp_port = (long) value;
+ break;
+ case GET_SMTPPORT:
+ value = (void *) smtp_port;
+ break;
+ case SET_SSLSMTPPORT:
+ smtp_sslport = (long) value;
+ break;
+ case GET_SSLSMTPPORT:
+ value = (void *) smtp_sslport;
+ break;
+ default:
+ value = NIL; /* error case */
+ break;
+ }
+ return value;
+}
+
+/* Mail Transfer Protocol open connection
+ * Accepts: network driver
+ * service host list
+ * port number
+ * service name
+ * SMTP open options
+ * Returns: SEND stream on success, NIL on failure
+ */
+
+SENDSTREAM *smtp_open_full (NETDRIVER *dv,char **hostlist,char *service,
+ unsigned long port,long options)
+{
+ SENDSTREAM *stream = NIL;
+ long reply;
+ char *s,tmp[MAILTMPLEN];
+ NETSTREAM *netstream;
+ NETMBX mb;
+ if (!(hostlist && *hostlist)) mm_log ("Missing SMTP service host",ERROR);
+ /* maximum domain name is 64 characters */
+ else do if (strlen (*hostlist) < SMTPMAXDOMAIN) {
+ sprintf (tmp,"{%.1000s}",*hostlist);
+ if (!mail_valid_net_parse_work (tmp,&mb,service ? service : "smtp") ||
+ mb.anoflag || mb.readonlyflag) {
+ sprintf (tmp,"Invalid host specifier: %.80s",*hostlist);
+ mm_log (tmp,ERROR);
+ }
+ else { /* light tryssl flag if requested */
+ mb.trysslflag = (options & SOP_TRYSSL) ? T : NIL;
+ /* explicit port overrides all */
+ if (mb.port) port = mb.port;
+ /* else /submit overrides port argument */
+ else if (!compare_cstring (mb.service,"submit")) {
+ port = SUBMITTCPPORT; /* override port, use IANA name */
+ strcpy (mb.service,"submission");
+ }
+ /* else port argument overrides SMTP port */
+ else if (!port) port = smtp_port ? smtp_port : SMTPTCPPORT;
+ if (netstream = /* try to open ordinary connection */
+ net_open (&mb,dv,port,
+ (NETDRIVER *) mail_parameters (NIL,GET_SSLDRIVER,NIL),
+ "*smtps",smtp_sslport ? smtp_sslport : SMTPSSLPORT)) {
+ stream = (SENDSTREAM *) memset (fs_get (sizeof (SENDSTREAM)),0,
+ sizeof (SENDSTREAM));
+ stream->netstream = netstream;
+ stream->host = cpystr ((long) mail_parameters (NIL,GET_TRUSTDNS,NIL) ?
+ net_host (netstream) : mb.host);
+ stream->debug = (mb.dbgflag || (options & OP_DEBUG)) ? T : NIL;
+ if (options & SOP_SECURE) mb.secflag = T;
+ /* get name of local host to use */
+ s = compare_cstring ("localhost",mb.host) ?
+ net_localhost (netstream) : "localhost";
+
+ do reply = smtp_reply (stream);
+ while ((reply < 100) || (stream->reply[3] == '-'));
+ if (reply != SMTPGREET){/* get SMTP greeting */
+ sprintf (tmp,"SMTP greeting failure: %.80s",stream->reply);
+ mm_log (tmp,ERROR);
+ stream = smtp_close (stream);
+ }
+ /* try EHLO first, then HELO */
+ else if (((reply = smtp_ehlo (stream,s,&mb)) != SMTPOK) &&
+ ((reply = smtp_send (stream,"HELO",s)) != SMTPOK)) {
+ sprintf (tmp,"SMTP hello failure: %.80s",stream->reply);
+ mm_log (tmp,ERROR);
+ stream = smtp_close (stream);
+ }
+ else {
+ NETDRIVER *ssld =(NETDRIVER *)mail_parameters(NIL,GET_SSLDRIVER,NIL);
+ sslstart_t stls = (sslstart_t) mail_parameters(NIL,GET_SSLSTART,NIL);
+ ESMTP.ok = T; /* ESMTP server, start TLS if present */
+ if (!dv && stls && ESMTP.service.starttls &&
+ !mb.sslflag && !mb.notlsflag &&
+ (smtp_send (stream,"STARTTLS",NIL) == SMTPGREET)) {
+ mb.tlsflag = T; /* TLS OK, get into TLS at this end */
+ stream->netstream->dtb = ssld;
+ /* TLS started, negotiate it */
+ if (!(stream->netstream->stream = (*stls)
+ (stream->netstream->stream,mb.host,
+ (mb.tlssslv23 ? NIL : NET_TLSCLIENT) |
+ (mb.novalidate ? NET_NOVALIDATECERT:NIL)))){
+ /* TLS negotiation failed after STARTTLS */
+ sprintf (tmp,"Unable to negotiate TLS with this server: %.80s",
+ mb.host);
+ mm_log (tmp,ERROR);
+ /* close without doing QUIT */
+ if (stream->netstream) net_close (stream->netstream);
+ stream->netstream = NIL;
+ stream = smtp_close (stream);
+ }
+ /* TLS OK, re-negotiate EHLO */
+ else if ((reply = smtp_ehlo (stream,s,&mb)) != SMTPOK) {
+ sprintf (tmp,"SMTP EHLO failure after STARTTLS: %.80s",
+ stream->reply);
+ mm_log (tmp,ERROR);
+ stream = smtp_close (stream);
+ }
+ else ESMTP.ok = T; /* TLS OK and EHLO successful */
+ }
+ else if (mb.tlsflag) {/* user specified /tls but can't do it */
+ sprintf (tmp,"TLS unavailable with this server: %.80s",mb.host);
+ mm_log (tmp,ERROR);
+ stream = smtp_close (stream);
+ }
+
+ /* remote name for authentication */
+ if (stream && ((mb.secflag || mb.user[0]))) {
+ if (ESMTP.auth) { /* use authenticator? */
+ if ((long) mail_parameters (NIL,GET_TRUSTDNS,NIL)) {
+ /* remote name for authentication */
+ strncpy (mb.host,
+ (long) mail_parameters (NIL,GET_SASLUSESPTRNAME,NIL) ?
+ net_remotehost (netstream) : net_host (netstream),
+ NETMAXHOST-1);
+ mb.host[NETMAXHOST-1] = '\0';
+ }
+ if (!smtp_auth (stream,&mb,tmp)) stream = smtp_close (stream);
+ }
+ else { /* no available authenticators? */
+ sprintf (tmp,"%sSMTP authentication not available: %.80s",
+ mb.secflag ? "Secure " : "",mb.host);
+ mm_log (tmp,ERROR);
+ stream = smtp_close (stream);
+ }
+ }
+ }
+ }
+ }
+ } while (!stream && *++hostlist);
+ if (stream) { /* set stream options if have a stream */
+ if (options &(SOP_DSN | SOP_DSN_NOTIFY_FAILURE | SOP_DSN_NOTIFY_DELAY |
+ SOP_DSN_NOTIFY_SUCCESS | SOP_DSN_RETURN_FULL)) {
+ ESMTP.dsn.want = T;
+ if (options & SOP_DSN_NOTIFY_FAILURE) ESMTP.dsn.notify.failure = T;
+ if (options & SOP_DSN_NOTIFY_DELAY) ESMTP.dsn.notify.delay = T;
+ if (options & SOP_DSN_NOTIFY_SUCCESS) ESMTP.dsn.notify.success = T;
+ if (options & SOP_DSN_RETURN_FULL) ESMTP.dsn.full = T;
+ }
+ if (options & SOP_8BITMIME) ESMTP.eightbit.want = T;
+ }
+ return stream;
+}
+
+/* SMTP authenticate
+ * Accepts: stream to login
+ * parsed network mailbox structure
+ * scratch buffer
+ * place to return user name
+ * Returns: T on success, NIL on failure
+ */
+
+long smtp_auth (SENDSTREAM *stream,NETMBX *mb,char *tmp)
+{
+ unsigned long trial,auths;
+ char *lsterr = NIL;
+ char usr[MAILTMPLEN];
+ AUTHENTICATOR *at;
+ long ret = NIL;
+ for (auths = ESMTP.auth, stream->saslcancel = NIL;
+ !ret && stream->netstream && auths &&
+ (at = mail_lookup_auth (find_rightmost_bit (&auths) + 1)); ) {
+ if (lsterr) { /* previous authenticator failed? */
+ sprintf (tmp,"Retrying using %s authentication after %.80s",
+ at->name,lsterr);
+ mm_log (tmp,NIL);
+ fs_give ((void **) &lsterr);
+ }
+ trial = 0; /* initial trial count */
+ tmp[0] = '\0'; /* empty buffer */
+ if (stream->netstream) do {
+ if (lsterr) {
+ sprintf (tmp,"Retrying %s authentication after %.80s",at->name,lsterr);
+ mm_log (tmp,WARN);
+ fs_give ((void **) &lsterr);
+ }
+ stream->saslcancel = NIL;
+ if (smtp_send (stream,"AUTH",at->name) == SMTPAUTHREADY) {
+ /* hide client authentication responses */
+ if (!(at->flags & AU_SECURE)) stream->sensitive = T;
+ if ((*at->client) (smtp_challenge,smtp_response,"smtp",mb,stream,
+ &trial,usr)) {
+ if (stream->replycode == SMTPAUTHED) {
+ ESMTP.auth = NIL; /* disable authenticators */
+ ret = LONGT;
+ }
+ /* if main program requested cancellation */
+ else if (!trial) mm_log ("SMTP Authentication cancelled",ERROR);
+ }
+ stream->sensitive = NIL;/* unhide */
+ }
+ /* remember response if error and no cancel */
+ if (!ret && trial) lsterr = cpystr (stream->reply);
+ } while (!ret && stream->netstream && trial &&
+ (trial < smtp_maxlogintrials));
+ }
+ if (lsterr) { /* previous authenticator failed? */
+ if (!stream->saslcancel) { /* don't do this if a cancel */
+ sprintf (tmp,"Can not authenticate to SMTP server: %.80s",lsterr);
+ mm_log (tmp,ERROR);
+ }
+ fs_give ((void **) &lsterr);
+ }
+ return ret; /* authentication failed */
+}
+
+/* Get challenge to authenticator in binary
+ * Accepts: stream
+ * pointer to returned size
+ * Returns: challenge or NIL if not challenge
+ */
+
+void *smtp_challenge (void *s,unsigned long *len)
+{
+ char tmp[MAILTMPLEN];
+ void *ret = NIL;
+ SENDSTREAM *stream = (SENDSTREAM *) s;
+ if ((stream->replycode == SMTPAUTHREADY) &&
+ !(ret = rfc822_base64 ((unsigned char *) stream->reply + 4,
+ strlen (stream->reply + 4),len))) {
+ sprintf (tmp,"SMTP SERVER BUG (invalid challenge): %.80s",stream->reply+4);
+ mm_log (tmp,ERROR);
+ }
+ return ret;
+}
+
+
+/* Send authenticator response in BASE64
+ * Accepts: MAIL stream
+ * string to send
+ * length of string
+ * Returns: T, always
+ */
+
+long smtp_response (void *s,char *response,unsigned long size)
+{
+ SENDSTREAM *stream = (SENDSTREAM *) s;
+ unsigned long i,j;
+ char *t,*u;
+ if (response) { /* make CRLFless BASE64 string */
+ if (size) {
+ for (t = (char *) rfc822_binary ((void *) response,size,&i),u = t,j = 0;
+ j < i; j++) if (t[j] > ' ') *u++ = t[j];
+ *u = '\0'; /* tie off string */
+ i = smtp_send (stream,t,NIL);
+ fs_give ((void **) &t);
+ }
+ else i = smtp_send (stream,"",NIL);
+ }
+ else { /* abort requested */
+ i = smtp_send (stream,"*",NIL);
+ stream->saslcancel = T; /* mark protocol-requested SASL cancel */
+ }
+ return LONGT;
+}
+
+/* Mail Transfer Protocol close connection
+ * Accepts: SEND stream
+ * Returns: NIL always
+ */
+
+SENDSTREAM *smtp_close (SENDSTREAM *stream)
+{
+ if (stream) { /* send "QUIT" */
+ if (stream->netstream) { /* do close actions if have netstream */
+ smtp_send (stream,"QUIT",NIL);
+ if (stream->netstream) /* could have been closed during "QUIT" */
+ net_close (stream->netstream);
+ }
+ /* clean up */
+ if (stream->host) fs_give ((void **) &stream->host);
+ if (stream->reply) fs_give ((void **) &stream->reply);
+ if (ESMTP.dsn.envid) fs_give ((void **) &ESMTP.dsn.envid);
+ if (ESMTP.atrn.domains) fs_give ((void **) &ESMTP.atrn.domains);
+ fs_give ((void **) &stream);/* flush the stream */
+ }
+ return NIL;
+}
+
+/* Mail Transfer Protocol deliver mail
+ * Accepts: SEND stream
+ * delivery option (MAIL, SEND, SAML, SOML)
+ * message envelope
+ * message body
+ * Returns: T on success, NIL on failure
+ */
+
+long smtp_mail (SENDSTREAM *stream,char *type,ENVELOPE *env,BODY *body)
+{
+ RFC822BUFFER buf;
+ char tmp[SENDBUFLEN+1];
+ long error = NIL;
+ long retry = NIL;
+ buf.f = smtp_soutr; /* initialize buffer */
+ buf.s = stream->netstream;
+ buf.end = (buf.beg = buf.cur = tmp) + SENDBUFLEN;
+ tmp[SENDBUFLEN] = '\0'; /* must have additional null guard byte */
+ if (!(env->to || env->cc || env->bcc)) {
+ /* no recipients in request */
+ smtp_seterror (stream,SMTPHARDERROR,"No recipients specified");
+ return NIL;
+ }
+ do { /* make sure stream is in good shape */
+ smtp_send (stream,"RSET",NIL);
+ if (retry) { /* need to retry with authentication? */
+ NETMBX mb;
+ /* yes, build remote name for authentication */
+ sprintf (tmp,"{%.200s/smtp%s}<none>",
+ (long) mail_parameters (NIL,GET_TRUSTDNS,NIL) ?
+ ((long) mail_parameters (NIL,GET_SASLUSESPTRNAME,NIL) ?
+ net_remotehost (stream->netstream) :
+ net_host (stream->netstream)) :
+ stream->host,
+ (stream->netstream->dtb ==
+ (NETDRIVER *) mail_parameters (NIL,GET_SSLDRIVER,NIL)) ?
+ "/ssl" : "");
+ mail_valid_net_parse (tmp,&mb);
+ if (!smtp_auth (stream,&mb,tmp)) return NIL;
+ retry = NIL; /* no retry at this point */
+ }
+
+ strcpy (tmp,"FROM:<"); /* compose "MAIL FROM:<return-path>" */
+#ifdef RFC2821
+ if (env->return_path && env->return_path->host &&
+ !((strlen (env->return_path->mailbox) > SMTPMAXLOCALPART) ||
+ (strlen (env->return_path->host) > SMTPMAXDOMAIN))) {
+ rfc822_cat (tmp,env->return_path->mailbox,NIL);
+ sprintf (tmp + strlen (tmp),"@%s",env->return_path->host);
+ }
+#else /* old code with A-D-L support */
+ if (env->return_path && env->return_path->host &&
+ !((env->return_path->adl &&
+ (strlen (env->return_path->adl) > SMTPMAXPATH)) ||
+ (strlen (env->return_path->mailbox) > SMTPMAXLOCALPART) ||
+ (strlen (env->return_path->host) > SMTPMAXDOMAIN)))
+ rfc822_address (tmp,env->return_path);
+#endif
+ strcat (tmp,">");
+ if (ESMTP.ok) {
+ if (ESMTP.eightbit.ok && ESMTP.eightbit.want)
+ strcat (tmp," BODY=8BITMIME");
+ if (ESMTP.dsn.ok && ESMTP.dsn.want) {
+ strcat (tmp,ESMTP.dsn.full ? " RET=FULL" : " RET=HDRS");
+ if (ESMTP.dsn.envid)
+ sprintf (tmp + strlen (tmp)," ENVID=%.100s",ESMTP.dsn.envid);
+ }
+ }
+ /* send "MAIL FROM" command */
+ switch (smtp_send (stream,type,tmp)) {
+ case SMTPUNAVAIL: /* mailbox unavailable? */
+ case SMTPWANTAUTH: /* wants authentication? */
+ case SMTPWANTAUTH2:
+ if (ESMTP.auth) retry = T;/* yes, retry with authentication */
+ case SMTPOK: /* looks good */
+ break;
+ default: /* other failure */
+ return NIL;
+ }
+ /* negotiate the recipients */
+ if (!retry && env->to) retry = smtp_rcpt (stream,env->to,&error);
+ if (!retry && env->cc) retry = smtp_rcpt (stream,env->cc,&error);
+ if (!retry && env->bcc) retry = smtp_rcpt (stream,env->bcc,&error);
+ if (!retry && error) { /* any recipients failed? */
+ smtp_send (stream,"RSET",NIL);
+ smtp_seterror (stream,SMTPHARDERROR,"One or more recipients failed");
+ return NIL;
+ }
+ } while (retry);
+ /* negotiate data command */
+ if (!(smtp_send (stream,"DATA",NIL) == SMTPREADY)) return NIL;
+ /* send message data */
+ if (!rfc822_output_full (&buf,env,body,
+ ESMTP.eightbit.ok && ESMTP.eightbit.want)) {
+ smtp_fake (stream,"SMTP connection broken (message data)");
+ return NIL; /* can't do much else here */
+ }
+ /* send trailing dot */
+ return (smtp_send (stream,".",NIL) == SMTPOK) ? LONGT : NIL;
+}
+
+/* Simple Mail Transfer Protocol send VERBose
+ * Accepts: SMTP stream
+ * Returns: T if successful, else NIL
+ *
+ * Descriptive text formerly in [al]pine sources:
+ * At worst, this command may cause the SMTP connection to get nuked. Modern
+ * sendmail's recognize it, and possibly other SMTP implementations (the "ON"
+ * arg is for PMDF). What's more, if it works, the reply code and accompanying
+ * text may vary from server to server.
+ */
+
+long smtp_verbose (SENDSTREAM *stream)
+{
+ /* accept any 2xx reply code */
+ return ((smtp_send (stream,"VERB","ON") / (long) 100) == 2) ? LONGT : NIL;
+}
+
+/* Internal routines */
+
+
+/* Simple Mail Transfer Protocol send recipient
+ * Accepts: SMTP stream
+ * address list
+ * pointer to error flag
+ * Returns: T if should retry, else NIL
+ */
+
+long smtp_rcpt (SENDSTREAM *stream,ADDRESS *adr,long *error)
+{
+ char *s,tmp[2*MAILTMPLEN],orcpt[MAILTMPLEN];
+ while (adr) { /* for each address on the list */
+ /* clear any former error */
+ if (adr->error) fs_give ((void **) &adr->error);
+ if (adr->host) { /* ignore group syntax */
+ /* enforce SMTP limits to protect the buffer */
+ if (strlen (adr->mailbox) > MAXLOCALPART) {
+ adr->error = cpystr ("501 Recipient name too long");
+ *error = T;
+ }
+ else if ((strlen (adr->host) > SMTPMAXDOMAIN)) {
+ adr->error = cpystr ("501 Recipient domain too long");
+ *error = T;
+ }
+#ifndef RFC2821 /* old code with A-D-L support */
+ else if (adr->adl && (strlen (adr->adl) > SMTPMAXPATH)) {
+ adr->error = cpystr ("501 Path too long");
+ *error = T;
+ }
+#endif
+
+ else {
+ strcpy (tmp,"TO:<"); /* compose "RCPT TO:<return-path>" */
+#ifdef RFC2821
+ rfc822_cat (tmp,adr->mailbox,NIL);
+ sprintf (tmp + strlen (tmp),"@%s>",adr->host);
+#else /* old code with A-D-L support */
+ rfc822_address (tmp,adr);
+ strcat (tmp,">");
+#endif
+ /* want notifications */
+ if (ESMTP.ok && ESMTP.dsn.ok && ESMTP.dsn.want) {
+ /* yes, start with prefix */
+ strcat (tmp," NOTIFY=");
+ s = tmp + strlen (tmp);
+ if (ESMTP.dsn.notify.failure) strcat (s,"FAILURE,");
+ if (ESMTP.dsn.notify.delay) strcat (s,"DELAY,");
+ if (ESMTP.dsn.notify.success) strcat (s,"SUCCESS,");
+ /* tie off last comma */
+ if (*s) s[strlen (s) - 1] = '\0';
+ else strcat (tmp,"NEVER");
+ if (adr->orcpt.addr) {
+ sprintf (orcpt,"%.498s;%.498s",
+ adr->orcpt.type ? adr->orcpt.type : "rfc822",
+ adr->orcpt.addr);
+ sprintf (tmp + strlen (tmp)," ORCPT=%.500s",orcpt);
+ }
+ }
+ switch (smtp_send (stream,"RCPT",tmp)) {
+ case SMTPOK: /* looks good */
+ break;
+ case SMTPUNAVAIL: /* mailbox unavailable? */
+ case SMTPWANTAUTH: /* wants authentication? */
+ case SMTPWANTAUTH2:
+ if (ESMTP.auth) return T;
+ default: /* other failure */
+ *error = T; /* note that an error occurred */
+ adr->error = cpystr (stream->reply);
+ }
+ }
+ }
+ adr = adr->next; /* do any subsequent recipients */
+ }
+ return NIL; /* no retry called for */
+}
+
+/* Simple Mail Transfer Protocol send command
+ * Accepts: SEND stream
+ * text
+ * Returns: reply code
+ */
+
+long smtp_send (SENDSTREAM *stream,char *command,char *args)
+{
+ long ret;
+ char *s = (char *) fs_get (strlen (command) + (args ? strlen (args) + 1 : 0)
+ + 3);
+ /* build the complete command */
+ if (args) sprintf (s,"%s %s",command,args);
+ else strcpy (s,command);
+ if (stream->debug) mail_dlog (s,stream->sensitive);
+ strcat (s,"\015\012");
+ /* send the command */
+ if (stream->netstream && net_soutr (stream->netstream,s)) {
+ do stream->replycode = smtp_reply (stream);
+ while ((stream->replycode < 100) || (stream->reply[3] == '-'));
+ ret = stream->replycode;
+ }
+ else ret = smtp_fake (stream,"SMTP connection broken (command)");
+ fs_give ((void **) &s);
+ return ret;
+}
+
+
+/* Simple Mail Transfer Protocol get reply
+ * Accepts: SMTP stream
+ * Returns: reply code
+ */
+
+long smtp_reply (SENDSTREAM *stream)
+{
+ smtpverbose_t pv = (smtpverbose_t) mail_parameters (NIL,GET_SMTPVERBOSE,NIL);
+ long reply;
+ /* flush old reply */
+ if (stream->reply) fs_give ((void **) &stream->reply);
+ /* get reply */
+ if (stream->netstream && (stream->reply = net_getline (stream->netstream))) {
+ if (stream->debug) mm_dlog (stream->reply);
+ /* return response code */
+ reply = atol (stream->reply);
+ if (pv && (reply < 100)) (*pv) (stream->reply);
+ }
+ else reply = smtp_fake (stream,"SMTP connection broken (reply)");
+ return reply;
+}
+
+/* Simple Mail Transfer Protocol send EHLO
+ * Accepts: SMTP stream
+ * host name to use in EHLO
+ * NETMBX structure
+ * Returns: reply code
+ */
+
+long smtp_ehlo (SENDSTREAM *stream,char *host,NETMBX *mb)
+{
+ unsigned long i,j;
+ long flags = (mb->secflag ? AU_SECURE : NIL) |
+ (mb->authuser[0] ? AU_AUTHUSER : NIL);
+ char *s,*t,*r,tmp[MAILTMPLEN];
+ /* clear ESMTP data */
+ memset (&ESMTP,0,sizeof (ESMTP));
+ if (mb->loser) return 500; /* never do EHLO if a loser */
+ sprintf (tmp,"EHLO %s",host); /* build the complete command */
+ if (stream->debug) mm_dlog (tmp);
+ strcat (tmp,"\015\012");
+ /* send the command */
+ if (!net_soutr (stream->netstream,tmp))
+ return smtp_fake (stream,"SMTP connection broken (EHLO)");
+ /* got an OK reply? */
+ do if ((i = smtp_reply (stream)) == SMTPOK) {
+ /* hack for AUTH= */
+ if (stream->reply[4] && stream->reply[5] && stream->reply[6] &&
+ stream->reply[7] && (stream->reply[8] == '=')) stream->reply[8] = ' ';
+ /* get option code */
+ if (!(s = strtok_r (stream->reply+4," ",&r)));
+ /* have option, does it have a value */
+ else if ((t = strtok_r (NIL," ",&r)) && *t) {
+ /* EHLO options which take arguments */
+ if (!compare_cstring (s,"SIZE")) {
+ if (isdigit (*t)) ESMTP.size.limit = strtoul (t,&t,10);
+ ESMTP.size.ok = T;
+ }
+ else if (!compare_cstring (s,"DELIVERBY")) {
+ if (isdigit (*t)) ESMTP.deliverby.minby = strtoul (t,&t,10);
+ ESMTP.deliverby.ok = T;
+ }
+ else if (!compare_cstring (s,"ATRN")) {
+ ESMTP.atrn.domains = cpystr (t);
+ ESMTP.atrn.ok = T;
+ }
+ else if (!compare_cstring (s,"AUTH"))
+ do if ((j = mail_lookup_auth_name (t,flags)) &&
+ (--j < MAXAUTHENTICATORS)) ESMTP.auth |= (1 << j);
+ while ((t = strtok_r (NIL," ",&r)) && *t);
+ }
+ /* EHLO options which do not take arguments */
+ else if (!compare_cstring (s,"SIZE")) ESMTP.size.ok = T;
+ else if (!compare_cstring (s,"8BITMIME")) ESMTP.eightbit.ok = T;
+ else if (!compare_cstring (s,"DSN")) ESMTP.dsn.ok = T;
+ else if (!compare_cstring (s,"ATRN")) ESMTP.atrn.ok = T;
+ else if (!compare_cstring (s,"SEND")) ESMTP.service.send = T;
+ else if (!compare_cstring (s,"SOML")) ESMTP.service.soml = T;
+ else if (!compare_cstring (s,"SAML")) ESMTP.service.saml = T;
+ else if (!compare_cstring (s,"EXPN")) ESMTP.service.expn = T;
+ else if (!compare_cstring (s,"HELP")) ESMTP.service.help = T;
+ else if (!compare_cstring (s,"TURN")) ESMTP.service.turn = T;
+ else if (!compare_cstring (s,"ETRN")) ESMTP.service.etrn = T;
+ else if (!compare_cstring (s,"STARTTLS")) ESMTP.service.starttls = T;
+ else if (!compare_cstring (s,"RELAY")) ESMTP.service.relay = T;
+ else if (!compare_cstring (s,"PIPELINING")) ESMTP.service.pipe = T;
+ else if (!compare_cstring (s,"ENHANCEDSTATUSCODES"))
+ ESMTP.service.ensc = T;
+ else if (!compare_cstring (s,"BINARYMIME")) ESMTP.service.bmime = T;
+ else if (!compare_cstring (s,"CHUNKING")) ESMTP.service.chunk = T;
+ }
+ while ((i < 100) || (stream->reply[3] == '-'));
+ /* disable LOGIN if PLAIN also advertised */
+ if ((j = mail_lookup_auth_name ("PLAIN",NIL)) && (--j < MAXAUTHENTICATORS) &&
+ (ESMTP.auth & (1 << j)) &&
+ (j = mail_lookup_auth_name ("LOGIN",NIL)) && (--j < MAXAUTHENTICATORS))
+ ESMTP.auth &= ~(1 << j);
+ return i; /* return the response code */
+}
+
+/* Simple Mail Transfer Protocol set fake error and abort
+ * Accepts: SMTP stream
+ * error text
+ * Returns: SMTPSOFTFATAL, always
+ */
+
+long smtp_fake (SENDSTREAM *stream,char *text)
+{
+ if (stream->netstream) { /* close net connection if still open */
+ net_close (stream->netstream);
+ stream->netstream = NIL;
+ }
+ /* set last error */
+ return smtp_seterror (stream,SMTPSOFTFATAL,text);
+}
+
+
+/* Simple Mail Transfer Protocol set error
+ * Accepts: SMTP stream
+ * SMTP error code
+ * error text
+ * Returns: error code
+ */
+
+static long smtp_seterror (SENDSTREAM *stream,long code,char *text)
+{
+ /* flush any old reply */
+ if (stream->reply ) fs_give ((void **) &stream->reply);
+ /* set up pseudo-reply string */
+ stream->reply = (char *) fs_get (20+strlen (text));
+ sprintf (stream->reply,"%ld %s",code,text);
+ return code; /* return error code */
+}
+
+
+/* Simple Mail Transfer Protocol filter mail
+ * Accepts: stream
+ * string
+ * Returns: T on success, NIL on failure
+ */
+
+long smtp_soutr (void *stream,char *s)
+{
+ char c,*t;
+ /* "." on first line */
+ if (s[0] == '.') net_sout (stream,".",1);
+ /* find lines beginning with a "." */
+ while (t = strstr (s,"\015\012.")) {
+ c = *(t += 3); /* remember next character after "." */
+ *t = '\0'; /* tie off string */
+ /* output prefix */
+ if (!net_sout (stream,s,t-s)) return NIL;
+ *t = c; /* restore delimiter */
+ s = t - 1; /* push pointer up to the "." */
+ }
+ /* output remainder of text */
+ return *s ? net_soutr (stream,s) : T;
+}
generated by cgit v1.2.3-54-g00ecf (git 2.44.0) at 2024-06-25 06:32:37 +0000