ossp-pkg/lmtp2nntp/msg.c
/*
** Copyright (c) 2001 The OSSP Project <http://www.ossp.org/>
** Copyright (c) 2001 Cable & Wireless Deutschland <http://www.cw.com/de/>
**
** This file is part of OSSP lmtp2nntp, an LMTP speaking local
** mailer which forwards mails as Usenet news articles via NNTP.
** It can be found at http://www.ossp.org/pkg/lmtp2nntp/.
**
** This program is free software; you can redistribute it and/or
** modify it under the terms of the GNU General Public License
** as published by the Free Software Foundation; either version
** 2.0 of the License, or (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this file; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
** USA, or contact the OSSP project <ossp@ossp.org>.
**
** msg.c: mail message manipulation library
*/
#include <stdlib.h>
#include <stdio.h>
#include "msg.h"
#include "str.h"
#include "argz.h"
/* third party */
#include "l2.h"
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#if defined(HAVE_DMALLOC_H) && defined(DMALLOC)
#include "dmalloc.h"
#endif
msg_t *msg_create(void)
{
msg_t *msg;
if ((msg = (msg_t *)malloc(sizeof(msg_t))) == NULL)
return NULL;
msg->azEnvgroups = NULL;
msg->asEnvgroups = 0;
msg->cpMsg = NULL;
msg->azHeaders = NULL;
msg->asHeaders = 0;
msg->cpFid = NULL;
msg->cpBody = NULL;
msg->cpMsgid = NULL;
msg->mail_from = NULL;
msg->azRcpt = NULL;
msg->asRcpt = 0;
msg->azNewsgroups = NULL;
msg->asNewsgroups = 0;
msg->l2 = NULL; /* this is a copy only */
return msg;
}
void msg_destroy(msg_t *msg)
{
if (msg == NULL)
return;
if (msg->azEnvgroups != NULL)
free(msg->azEnvgroups);
if (msg->cpMsg != NULL)
free(msg->cpMsg);
if (msg->azHeaders != NULL)
free(msg->azHeaders);
if (msg->cpFid != NULL)
free(msg->cpFid);
if (msg->cpBody != NULL)
free(msg->cpBody);
if (msg->cpMsgid != NULL)
free(msg->cpMsgid);
if (msg->mail_from != NULL)
free(msg->mail_from);
if (msg->azRcpt != NULL)
free(msg->azRcpt);
if (msg->azNewsgroups != NULL)
free(msg->azNewsgroups);
msg->l2 = NULL; /* this is a copy only, the "parent" needs to clean this up */
free(msg);
return;
}
msg_rc_t msg_split(msg_t *msg)
{
char *cpName;
char *cpValue;
char *cpRem; /* Remainder */
char *cp;
char *cpHeaders;
/* INPUTS
*
* msg->cpMsg
* must contain the wholly RFC0822 formatted message with native
* (unescaped) dots at the beginning of a line, the 'From ' envelope,
* headers, double newline, body, NUL, no trailing dot;
*
* OUTPUTS
*
* msg->cpMsg
* free()d and set to NULL
*
* msg->azHeaders, msg->asHeaders contains the headers in argz format, one
* logical NUL-terminated line per header which might be wrapped into
* multiple '\n'-ended physical lines. The "From " envelope, "Received:",
* "Path:", "To:" and "Cc:" headers are removed silently. The
* "Newsgroups:" and "Message-ID" headers are removed and their values are
* stored in separate structures (see below).
*
* msg->cpBody
* contains the unmodified body of the message, NUL-terminated, no
* trailing dot.
*
* msg->cpMsgid
* contains the message id including surrounding angle brackets.
*
* msg->azNewsgroups, asNewsgroups
* is a argz-type array of strings containing the Newsgroups based on the
* header information.
*/
log0(msg, DEBUG, "split message into header and body");
if (str_parse(msg->cpMsg, "m/((?:.*?)\\n)\\n(.*)$/s", &cpHeaders, &msg->cpBody) <= 0)
return MSG_ERR_SPLITHEADBODY;
free(msg->cpMsg);
msg->cpMsg = NULL;
log0(msg, DEBUG, "replace envelope From w/o colon by X-F: pseudotag");
/* This eliminates the special case of having one header, which is really
* an embedded envelope, not ending with a colon while all others do.
* After splitting headers into name and value pairs this envelope ist
* stripped off.
*/
if (strncasecmp(cpHeaders, "From", 4) == 0)
memcpy(cpHeaders, "X-F:", 4);
log0(msg, DEBUG, "unwrap header lines");
/* poor man's s///g simulator as current str library doesn't support global substitution */
while (str_parse(cpHeaders, "s/(.*?)\\n[ \\t]+(.*)/$1 $2/s", &cpRem) > 0) {
free(cpHeaders);
cpHeaders = cpRem;
}
log0(msg, DEBUG, "split header lines into names and values");
while (str_parse(cpHeaders, "m/^[> \\t]*([\\x21-\\x7e]+?:)[ \\t]*([^\\n]*?)[ \\t]*\\n(.*)/s", &cpName, &cpValue, &cpRem) > 0) {
free(cpHeaders);
cpHeaders = cpRem;
argz_add(&msg->azHeaders, &msg->asHeaders, cpName);
argz_add(&msg->azHeaders, &msg->asHeaders, cpValue);
free(cpName);
free(cpValue);
}
log0(msg, DEBUG, "check for headers we care about and do whatever neccessary");
msg->cpMsgid = NULL;
msg->azNewsgroups = NULL;
msg->asNewsgroups = 0;
cp = msg->azHeaders;
while (cp != NULL) {
log1(msg, DEBUG, "processing header \"%s\"", cp);
if (strcasecmp("X-F:", cp) == 0) {
argz_delete(&msg->azHeaders, &msg->asHeaders, cp); /* del name */
argz_delete(&msg->azHeaders, &msg->asHeaders, cp); /* del value */
continue;
}
if (strcasecmp("Path:", cp) == 0) {
argz_delete(&msg->azHeaders, &msg->asHeaders, cp); /* del name */
argz_delete(&msg->azHeaders, &msg->asHeaders, cp); /* del value */
continue;
}
if (strcasecmp("Received:", cp) == 0) {
argz_delete(&msg->azHeaders, &msg->asHeaders, cp); /* del name */
if ((msg->cpFid == NULL) &&
(str_parse(cp, "m/\\sid\\s+<?([\\w\\d]{1,30})/i", &msg->cpFid) > 0))
log1(msg, DEBUG, "found foreign-ID \"%s\" for logging", msg->cpFid);
argz_delete(&msg->azHeaders, &msg->asHeaders, cp); /* del value */
continue;
}
if (strcasecmp("To:", cp) == 0) {
argz_delete(&msg->azHeaders, &msg->asHeaders, cp); /* del name */
argz_delete(&msg->azHeaders, &msg->asHeaders, cp); /* del value */
continue;
}
if (strcasecmp("Cc:", cp) == 0) {
argz_delete(&msg->azHeaders, &msg->asHeaders, cp); /* del name */
argz_delete(&msg->azHeaders, &msg->asHeaders, cp); /* del value */
continue;
}
if (strcasecmp("Message-ID:", cp) == 0) {
if (msg->cpMsgid != NULL)
return MSG_ERR_SPLITIDMULTI;
argz_delete(&msg->azHeaders, &msg->asHeaders, cp); /* del name */
if ((cp == NULL) || (strlen(cp) == 0)) /* get value */
return MSG_ERR_SPLITIDEMPTY;
if ((msg->cpMsgid = strdup(cp)) == NULL)
return MSG_ERR_MEM;
argz_delete(&msg->azHeaders, &msg->asHeaders, cp); /* del value */
continue;
}
if (strcasecmp("Newsgroups:", cp) == 0) {
argz_delete(&msg->azHeaders, &msg->asHeaders, cp); /* del name */
if (argz_add(&msg->azNewsgroups, &msg->asNewsgroups, cp) != 0) /* get value */
return MSG_ERR_MEM;
argz_delete(&msg->azHeaders, &msg->asHeaders, cp); /* del value */
continue;
}
if ((cp = argz_next(msg->azHeaders, msg->asHeaders, cp)) == NULL) /* next value */
break;
if ((cp = argz_next(msg->azHeaders, msg->asHeaders, cp)) == NULL) /* next name */
break;
}
log0(msg, DEBUG, "checking Message-ID");
if (msg->cpMsgid == NULL)
return MSG_ERR_SPLITIDNONE;
log0(msg, DEBUG, "checking Newsgroups");
if (msg->azNewsgroups != NULL) {
argz_stringify(msg->azNewsgroups, msg->asNewsgroups, ',');
if (argz_create_sep(msg->azNewsgroups, ',', &msg->azNewsgroups, &msg->asNewsgroups) != 0)
return MSG_ERR_MEM;
}
log0(msg, DEBUG, "adding mandatory Path: header");
argz_add(&msg->azHeaders, &msg->asHeaders, "Path:");
argz_add(&msg->azHeaders, &msg->asHeaders, "lmtp2nntp!not-for-mail");
log0(msg, DEBUG, "split complete");
return MSG_OK;
}
msg_rc_t msg_join(msg_t *msg)
{
char *cp;
char *cpRem;
char **aHeaders;
int i;
int o;
char *cpCut;
char *cpWrap;
char c;
char cOld;
int n;
char *cpHeaders;
char *azNewheaders;
size_t asNewheaders;
log0(msg, DEBUG, "verify Newsgroups");
if (msg->azNewsgroups == NULL)
return MSG_ERR_JOINGROUPNONE;
argz_stringify(msg->azNewsgroups, msg->asNewsgroups, ',');
if (strlen(msg->azNewsgroups) == 0)
return MSG_ERR_JOINGROUPEMPTY;
argz_add(&msg->azHeaders, &msg->asHeaders, "Newsgroups:");
argz_add(&msg->azHeaders, &msg->asHeaders, msg->azNewsgroups);
log0(msg, DEBUG, "verify Message-ID");
if (msg->cpMsgid == NULL)
return MSG_ERR_JOINIDNONE;
if (strlen(msg->cpMsgid) == 0)
return MSG_ERR_JOINIDEMPTY;
argz_add(&msg->azHeaders, &msg->asHeaders, "Message-ID:");
argz_add(&msg->azHeaders, &msg->asHeaders, msg->cpMsgid);
log0(msg, DEBUG, "merge name/value pairs into single string");
argz_add(&msg->azHeaders, &msg->asHeaders, ""); /* append empty string */
if ((aHeaders = (char **)malloc((argz_count(msg->azHeaders, msg->asHeaders) + 1) * sizeof(char *))) == NULL)
return MSG_ERR_MEM;
argz_extract(msg->azHeaders, msg->asHeaders, aHeaders);
/* replace the trailing NUL, which is *(cp-1) of the predecessor, with a
* space at every second string. Break action when terminating NULL string
* is detected */
i=0;
while(1) {
if ((cp = aHeaders[++i]) == NULL)
break;
*(cp-1) = ' ';
if ((cp = aHeaders[++i]) == NULL)
break;
}
free(aHeaders);
log0(msg, DEBUG, "fold headers");
/* A logical line is split into one or more physical '\n'-terminated
* lines. The physical line is never longer than WRAPAT characters. This
* includes the folded data and the header name + colon + space for the
* first line and WRAPUSING string prefix for all other lines. Leading and
* trailing blanks of folded lines are removed while blanks inside the
* line are preserved. The header is never left alone in a physical line.
* Fragments exceeding WRAPAT characters without having a blank as a
* splitting point are forcibly cut at a non-blank character.
*/
azNewheaders = NULL;
asNewheaders = 0;
cp = NULL;
while ((cp = argz_next(msg->azHeaders, msg->asHeaders, cp)) != NULL) {
if (strlen(cp) > WRAPAT) {
cpRem = cp;
cpWrap = NULL;
for (o = 0; (cpRem[o] != ':') && (cpRem[o] != NUL); o++); /* offset name so at least one char of value remains in first line */
o += 2; /* skip ": " */
while ((strlen(cpRem) + (cpWrap == NULL ? 0 : strlen(WRAPUSING))) > WRAPAT) {
for (i = WRAPAT - 1 - (cpWrap == NULL ? 0 :
strlen(WRAPUSING)); (i >= o) && !isspace((int)cpRem[i]); i--);
if (i < o)
i = WRAPAT - 1 - (cpWrap == NULL ? 0 : strlen(WRAPUSING) - 1); /* sorry, forced cut at non-blank */
cpCut = cpRem;
cpRem += i;
for (; (isspace((int)*cpRem) && (*cpRem != NUL)); cpRem++); /* skip next lines leading blanks */
for (; (i >= o) && isspace((int)cpCut[i-1]); i--); /* chop off this lines trailing blanks */
if (i >= o) { /* only keep line fragment if some non-blanks inside */
if (cpWrap == NULL) {
if ((cpWrap = (char *)malloc(i+strlen(WRAPUSING)+1)) == NULL)
return MSG_ERR_MEM;
*cpWrap = NUL;
o = 1;
}
else {
if ((cpWrap = (char *)realloc(cpWrap, strlen(cpWrap)+i+strlen(WRAPUSING)+1)) == NULL)
return MSG_ERR_MEM;
strcat(cpWrap, WRAPUSING);
}
strncat(cpWrap, cpCut, i);
}
}
if (strlen(cpRem) > 0) {
if ((cpWrap = (char *)realloc(cpWrap, strlen(cpWrap)+strlen(cpRem)+strlen(WRAPUSING)+1)) == NULL)
return MSG_ERR_MEM;
strcat(cpWrap, WRAPUSING);
strcat(cpWrap, cpRem);
}
argz_add(&azNewheaders, &asNewheaders, cpWrap);
log2(msg, DEBUG, "a folded header \"%{text}D\"", cpWrap, strlen(cpWrap));
free(cpWrap);
}
else {
argz_add(&azNewheaders, &asNewheaders, cp);
log2(msg, DEBUG, "verbatim header \"%{text}D\"", cp, strlen(cp));
}
}
free(msg->azHeaders);
msg->azHeaders = azNewheaders;
msg->asHeaders = asNewheaders;
log0(msg, DEBUG, "strigify headers");
argz_stringify(msg->azHeaders, msg->asHeaders, '\n');
cpHeaders = msg->azHeaders;
/********************************************************************
* header + CRLF + body + '.' + CRLF + NUL, replacing NL with CRLF *
********************************************************************/
log0(msg, DEBUG, "assemble header and body");
n = 0;
/* count size of headers, reserve space for NL to CRLF conversion */
for (i = 0; ((c = cpHeaders[i]) != NUL); i++) {
if (c == '\n')
n++;
n++;
}
/* if headers don't end with NL, reserve space for CRLF */
if (i >= 0 && cpHeaders[i - 1] != '\n')
n+=2;
/* reserve space for CRLF between headers and body */
n+=2;
/* count size of body, reserve space for NL-DOT escape and NL to CRLF conversion */
cOld = '\n';
for (i = 0; ((c = msg->cpBody[i]) != NUL); i++) {
if (c == '\n')
n++;
if (c == '.' && cOld == '\n')
n++;
n++;
cOld = c;
}
/* if body doesn't end with NL, reserve space for CRLF */
if (i >= 0 && msg->cpBody[i - 1] != '\n')
n+=2;
/* reserve space for terminating '.'-CRLF-NUL at the end of the message */
n+=4;
if ((msg->cpMsg = (char *)malloc(n)) == NULL)
return MSG_ERR_MEM;
n = 0;
/* copy headers, do NL to CRLF conversion */
for (i = 0; ((c = cpHeaders[i]) != NUL); i++) {
if (c == '\n')
msg->cpMsg[n++] = '\r';
msg->cpMsg[n++] = c;
}
/* if headers don't end with NL, append CRLF */
if (i >= 0 && cpHeaders[i - 1] != '\n') {
msg->cpMsg[n++] = '\r';
msg->cpMsg[n++] = '\n';
}
/* add CRLF between headers and body */
msg->cpMsg[n++] = '\r';
msg->cpMsg[n++] = '\n';
/* copy body, do NL-DOT escape and NL to CRLF conversion */
cOld = '\n';
for (i = 0; ((c = msg->cpBody[i]) != NUL); i++) {
if (c == '\n')
msg->cpMsg[n++] = '\r';
if (c == '.' && cOld == '\n')
msg->cpMsg[n++] = '.';
msg->cpMsg[n++] = c;
cOld = c;
}
/* if body doesn't end with NL, append CRLF */
if (i >= 0 && msg->cpBody[i - 1] != '\n') {
msg->cpMsg[n++] = '\r';
msg->cpMsg[n++] = '\n';
}
/* add terminating '.'-CRLF-NUL at the end of the message */
msg->cpMsg[n++] = '.';
msg->cpMsg[n++] = '\r';
msg->cpMsg[n++] = '\n';
msg->cpMsg[n] = NUL;
log0(msg, DEBUG, "join complete");
return MSG_OK;
}
char *msg_error(msg_rc_t rc)
{
char *str;
str = "MSG: no description";
if (rc == MSG_OK ) str = "MSG: no error";
else if (rc == MSG_ERR_MEM ) str = "MSG: memory";
else if (rc == MSG_ERR_SPLITHEADBODY ) str = "MSG: split into header and body failed";
else if (rc == MSG_ERR_SPLITLEN ) str = "MSG: header is too short";
else if (rc == MSG_ERR_SPLITMISSINGFROM ) str = "MSG: header is missing 'From ' envelope";
else if (rc == MSG_ERR_SPLITIDNONE ) str = "MSG: header is missing 'Message-ID'";
else if (rc == MSG_ERR_SPLITIDEMPTY ) str = "MSG: header has empty 'Message-ID'";
else if (rc == MSG_ERR_SPLITIDMULTI ) str = "MSG: header has multiple 'Message-ID's";
else if (rc == MSG_ERR_JOINGROUPNONE ) str = "MSG: join with no 'Newsgroup'";
else if (rc == MSG_ERR_JOINGROUPEMPTY ) str = "MSG: join with empty 'Newsgroup'";
else if (rc == MSG_ERR_JOINIDNONE ) str = "MSG: join with no 'Message-ID'";
else if (rc == MSG_ERR_JOINIDEMPTY ) str = "MSG: join with empty 'Message-ID'";
return str;
}
