/*
* This file contains functions which handle the mapping of Internet addresses
* to users on the Citadel system.
*/
#include "sysdep.h"
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <ctype.h>
#include <signal.h>
#include <pwd.h>
#include <errno.h>
#include <sys/types.h>
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#include <sys/wait.h>
#include <string.h>
#include <limits.h>
#include <libcitadel.h>
#include "citadel.h"
#include "server.h"
#include "sysdep_decls.h"
#include "citserver.h"
#include "support.h"
#include "config.h"
#include "msgbase.h"
#include "internet_addressing.h"
#include "user_ops.h"
#include "room_ops.h"
#include "parsedate.h"
#include "database.h"
#include "ctdl_module.h"
#ifndef HAVE_SNPRINTF
#include "snprintf.h"
#endif
#ifdef HAVE_ICONV
#include <iconv.h>
#if 0
/* This is the non-define version in case of s.b. needing to debug */
inline void FindNextEnd (char *bptr, char *end)
{
/* Find the next ?Q? */
end = strchr(bptr + 2, '?');
if (end == NULL) return NULL;
if (((*(end + 1) == 'B') || (*(end + 1) == 'Q')) &&
(*(end + 2) == '?')) {
/* skip on to the end of the cluster, the next ?= */
end = strstr(end + 3, "?=");
}
else
/* sort of half valid encoding, try to find an end. */
end = strstr(bptr, "?=");
}
#endif
#define FindNextEnd(bptr, end) { \
end = strchr(bptr + 2, '?'); \
if (end != NULL) { \
if (((*(end + 1) == 'B') || (*(end + 1) == 'Q')) && (*(end + 2) == '?')) { \
end = strstr(end + 3, "?="); \
} else end = strstr(bptr, "?="); \
} \
}
/*
* Handle subjects with RFC2047 encoding such as:
* =?koi8-r?B?78bP0s3Mxc7JxSDXz9rE1dvO2c3JINvB0sHNySDP?=
*/
void utf8ify_rfc822_string(char *buf) {
char *start, *end, *next, *nextend, *ptr;
char newbuf[1024];
char charset[128];
char encoding[16];
char istr[1024];
iconv_t ic = (iconv_t)(-1) ;
char *ibuf; /**< Buffer of characters to be converted */
char *obuf; /**< Buffer for converted characters */
size_t ibuflen; /**< Length of input buffer */
size_t obuflen; /**< Length of output buffer */
char *isav; /**< Saved pointer to input buffer */
char *osav; /**< Saved pointer to output buffer */
int passes = 0;
int i, len, delta;
int illegal_non_rfc2047_encoding = 0;
/* Sometimes, badly formed messages contain strings which were simply
* written out directly in some foreign character set instead of
* using RFC2047 encoding. This is illegal but we will attempt to
* handle it anyway by converting from a user-specified default
* charset to UTF-8 if we see any nonprintable characters.
*/
len = strlen(buf);
for (i=0; i<len; ++i) {
if ((buf[i] < 32) || (buf[i] > 126)) {
illegal_non_rfc2047_encoding = 1;
i = len; ///< take a shortcut, it won't be more than one.
}
}
if (illegal_non_rfc2047_encoding) {
const char *default_header_charset = "iso-8859-1";
if ( (strcasecmp(default_header_charset, "UTF-8")) && (strcasecmp(default_header_charset, "us-ascii")) ) {
ctdl_iconv_open("UTF-8", default_header_charset, &ic);
if (ic != (iconv_t)(-1) ) {
ibuf = malloc(1024);
isav = ibuf;
safestrncpy(ibuf, buf, 1024);
ibuflen = strlen(ibuf);
obuflen = 1024;
obuf = (char *) malloc(obuflen);
osav = obuf;
iconv(ic, &ibuf, &ibuflen, &obuf, &obuflen);
osav[1024-obuflen] = 0;
strcpy(buf, osav);
free(osav);
iconv_close(ic);
free(isav);
}
}
}
/* pre evaluate the first pair */
nextend = end = NULL;
len = strlen(buf);
start = strstr(buf, "=?");
if (start != NULL)
FindNextEnd (start, end);
while ((start != NULL) && (end != NULL))
{
next = strstr(end, "=?");
if (next != NULL)
FindNextEnd(next, nextend);
if (nextend == NULL)
next = NULL;
/* did we find two partitions */
if ((next != NULL) &&
((next - end) > 2))
{
ptr = end + 2;
while ((ptr < next) &&
(isspace(*ptr) ||
(*ptr == '\r') ||
(*ptr == '\n') ||
(*ptr == '\t')))
ptr ++;
/* did we find a gab just filled with blanks? */
if (ptr == next)
{
memmove (end + 2,
next,
len - (next - start));
/* now terminate the gab at the end */
delta = (next - end) - 2;
len -= delta;
buf[len] = '\0';
/* move next to its new location. */
next -= delta;
nextend -= delta;
}
}
/* our next-pair is our new first pair now. */
start = next;
end = nextend;
}
/* Now we handle foreign character sets properly encoded
* in RFC2047 format.
*/
start = strstr(buf, "=?");
FindNextEnd((start != NULL)? start : buf, end);
while (start != NULL && end != NULL && end > start)
{
extract_token(charset, start, 1, '?', sizeof charset);
extract_token(encoding, start, 2, '?', sizeof encoding);
extract_token(istr, start, 3, '?', sizeof istr);
ibuf = malloc(1024);
isav = ibuf;
if (!strcasecmp(encoding, "B")) { /**< base64 */
ibuflen = CtdlDecodeBase64(ibuf, istr, strlen(istr));
}
else if (!strcasecmp(encoding, "Q")) { /**< quoted-printable */
size_t len;
long pos;
len = strlen(istr);
pos = 0;
while (pos < len)
{
if (istr[pos] == '_') istr[pos] = ' ';
pos++;
}
ibuflen = CtdlDecodeQuotedPrintable(ibuf, istr, len);
}
else {
strcpy(ibuf, istr); /**< unknown encoding */
ibuflen = strlen(istr);
}
ctdl_iconv_open("UTF-8", charset, &ic);
if (ic != (iconv_t)(-1) ) {
obuflen = 1024;
obuf = (char *) malloc(obuflen);
osav = obuf;
iconv(ic, &ibuf, &ibuflen, &obuf, &obuflen);
osav[1024-obuflen] = 0;
end = start;
end++;
strcpy(start, "");
remove_token(end, 0, '?');
remove_token(end, 0, '?');
remove_token(end, 0, '?');
remove_token(end, 0, '?');
strcpy(end, &end[1]);
snprintf(newbuf, sizeof newbuf, "%s%s%s", buf, osav, end);
strcpy(buf, newbuf);
free(osav);
iconv_close(ic);
}
else {
end = start;
end++;
strcpy(start, "");
remove_token(end, 0, '?');
remove_token(end, 0, '?');
remove_token(end, 0, '?');
remove_token(end, 0, '?');
strcpy(end, &end[1]);
snprintf(newbuf, sizeof newbuf, "%s(unreadable)%s", buf, end);
strcpy(buf, newbuf);
}
free(isav);
/*
* Since spammers will go to all sorts of absurd lengths to get their
* messages through, there are LOTS of corrupt headers out there.
* So, prevent a really badly formed RFC2047 header from throwing
* this function into an infinite loop.
*/
++passes;
if (passes > 20) return;
start = strstr(buf, "=?");
FindNextEnd((start != NULL)? start : buf, end);
}
}
#else
inline void utf8ify_rfc822_string(char *a){};
#endif
struct trynamebuf {
char buffer1[SIZ];
char buffer2[SIZ];
};
char *inetcfg = NULL;
struct spamstrings_t *spamstrings = NULL;
/*
* Return nonzero if the supplied name is an alias for this host.
*/
int CtdlHostAlias(char *fqdn) {
int config_lines;
int i;
char buf[256];
char host[256], type[256];
int found = 0;
if (fqdn == NULL) return(hostalias_nomatch);
if (IsEmptyStr(fqdn)) return(hostalias_nomatch);
if (!strcasecmp(fqdn, "localhost")) return(hostalias_localhost);
if (!strcasecmp(fqdn, config.c_fqdn)) return(hostalias_localhost);
if (!strcasecmp(fqdn, config.c_nodename)) return(hostalias_localhost);
if (inetcfg == NULL) return(hostalias_nomatch);
config_lines = num_tokens(inetcfg, '\n');
for (i=0; i<config_lines; ++i) {
extract_token(buf, inetcfg, i, '\n', sizeof buf);
extract_token(host, buf, 0, '|', sizeof host);
extract_token(type, buf, 1, '|', sizeof type);
found = 0;
/* Process these in a specific order, in case there are multiple matches.
* We want directory to override masq, for example.
*/
if ( (!strcasecmp(type, "masqdomain")) && (!strcasecmp(fqdn, host))) {
found = hostalias_masq;
}
if ( (!strcasecmp(type, "localhost")) && (!strcasecmp(fqdn, host))) {
found = hostalias_localhost;
}
if ( (!strcasecmp(type, "directory")) && (!strcasecmp(fqdn, host))) {
found = hostalias_directory;
}
if (found) return(found);
}
return(hostalias_nomatch);
}
/*
* Return 0 if a given string fuzzy-matches a Citadel user account
*
* FIXME ... this needs to be updated to handle aliases.
*/
int fuzzy_match(struct ctdluser *us, char *matchstring) {
int a;
long len;
if ( (!strncasecmp(matchstring, "cit", 3))
&& (atol(&matchstring[3]) == us->usernum)) {
return 0;
}
len = strlen(matchstring);
for (a=0; !IsEmptyStr(&us->fullname[a]); ++a) {
if (!strncasecmp(&us->fullname[a],
matchstring, len)) {
return 0;
}
}
return -1;
}
/*
* Unfold a multi-line field into a single line, removing multi-whitespaces
*/
void unfold_rfc822_field(char **field, char **FieldEnd)
{
int quote = 0;
char *pField = *field;
char *sField;
char *pFieldEnd = *FieldEnd;
while (isspace(*pField))
pField++;
/* remove leading/trailing whitespace */
;
while (isspace(*pFieldEnd))
pFieldEnd --;
*FieldEnd = pFieldEnd;
/* convert non-space whitespace to spaces, and remove double blanks */
for (sField = *field = pField;
sField < pFieldEnd;
pField++, sField++)
{
if ((*sField=='\r') || (*sField=='\n')) {
sField++;
if (*sField == '\n')
sField++;
*pField = *sField;
}
else {
if (*sField=='\"') quote = 1 - quote;
if (!quote) {
if (isspace(*sField))
{
*pField = ' ';
pField++;
sField++;
while ((sField < pFieldEnd) &&
isspace(*sField))
sField++;
*pField = *sField;
}
else *pField = *sField;
}
else *pField = *sField;
}
}
*pField = '\0';
*FieldEnd = pField - 1;
}
/*
* Split an RFC822-style address into userid, host, and full name
*
*/
void process_rfc822_addr(const char *rfc822, char *user, char *node, char *name)
{
int a;
strcpy(user, "");
strcpy(node, config.c_fqdn);
strcpy(name, "");
if (rfc822 == NULL) return;
/* extract full name - first, it's From minus <userid> */
strcpy(name, rfc822);
stripout(name, '<', '>');
/* strip anything to the left of a bang */
while ((!IsEmptyStr(name)) && (haschar(name, '!') > 0))
strcpy(name, &name[1]);
/* and anything to the right of a @ or % */
for (a = 0; a < strlen(name); ++a) {
if (name[a] == '@')
name[a] = 0;
if (name[a] == '%')
name[a] = 0;
}
/* but if there are parentheses, that changes the rules... */
if ((haschar(rfc822, '(') == 1) && (haschar(rfc822, ')') == 1)) {
strcpy(name, rfc822);
stripallbut(name, '(', ')');
}
/* but if there are a set of quotes, that supersedes everything */
if (haschar(rfc822, 34) == 2) {
strcpy(name, rfc822);
while ((!IsEmptyStr(name)) && (name[0] != 34)) {
strcpy(&name[0], &name[1]);
}
strcpy(&name[0], &name[1]);
for (a = 0; a < strlen(name); ++a)
if (name[a] == 34)
name[a] = 0;
}
/* extract user id */
strcpy(user, rfc822);
/* first get rid of anything in parens */
stripout(user, '(', ')');
/* if there's a set of angle brackets, strip it down to that */
if ((haschar(user, '<') == 1) && (haschar(user, '>') == 1)) {
stripallbut(user, '<', '>');
}
/* strip anything to the left of a bang */
while ((!IsEmptyStr(user)) && (haschar(user, '!') > 0))
strcpy(user, &user[1]);
/* and anything to the right of a @ or % */
for (a = 0; a < strlen(user); ++a) {
if (user[a] == '@')
user[a] = 0;
if (user[a] == '%')
user[a] = 0;
}
/* extract node name */
strcpy(node, rfc822);
/* first get rid of anything in parens */
stripout(node, '(', ')');
/* if there's a set of angle brackets, strip it down to that */
if ((haschar(node, '<') == 1) && (haschar(node, '>') == 1)) {
stripallbut(node, '<', '>');
}
/* If no node specified, tack ours on instead */
if (
(haschar(node, '@')==0)
&& (haschar(node, '%')==0)
&& (haschar(node, '!')==0)
) {
strcpy(node, config.c_nodename);
}
else {
/* strip anything to the left of a @ */
while ((!IsEmptyStr(node)) && (haschar(node, '@') > 0))
strcpy(node, &node[1]);
/* strip anything to the left of a % */
while ((!IsEmptyStr(node)) && (haschar(node, '%') > 0))
strcpy(node, &node[1]);
/* reduce multiple system bang paths to node!user */
while ((!IsEmptyStr(node)) && (haschar(node, '!') > 1))
strcpy(node, &node[1]);
/* now get rid of the user portion of a node!user string */
for (a = 0; a < strlen(node); ++a)
if (node[a] == '!')
node[a] = 0;
}
/* strip leading and trailing spaces in all strings */
striplt(user);
striplt(node);
striplt(name);
/* If we processed a string that had the address in angle brackets
* but no name outside the brackets, we now have an empty name. In
* this case, use the user portion of the address as the name.
*/
if ((IsEmptyStr(name)) && (!IsEmptyStr(user))) {
strcpy(name, user);
}
}
/*
* convert_field() is a helper function for convert_internet_message().
* Given start/end positions for an rfc822 field, it converts it to a Citadel
* field if it wants to, and unfolds it if necessary.
*
* Returns 1 if the field was converted and inserted into the Citadel message
* structure, implying that the source field should be removed from the
* message text.
*/
int convert_field(struct CtdlMessage *msg, const char *beg, const char *end) {
char *key, *value, *valueend;
long len;
const char *pos;
int i;
const char *colonpos = NULL;
int processed = 0;
char buf[SIZ];
char user[1024];
char node[1024];
char name[1024];
char addr[1024];
time_t parsed_date;
long valuelen;
for (pos = end; pos >= beg; pos--) {
if (*pos == ':') colonpos = pos;
}
if (colonpos == NULL) return(0); /* no colon? not a valid header line */
len = end - beg;
key = malloc(len + 2);
memcpy(key, beg, len + 1);
key[len] = '\0';
valueend = key + len;
* ( key + (colonpos - beg) ) = '\0';
value = &key[(colonpos - beg) + 1];
/* printf("Header: [%s]\nValue: [%s]\n", key, value); */
unfold_rfc822_field(&value, &valueend);
valuelen = valueend - value + 1;
/* printf("UnfoldedValue: [%s]\n", value); */
/*
* Here's the big rfc822-to-citadel loop.
*/
/* Date/time is converted into a unix timestamp. If the conversion
* fails, we replace it with the time the message arrived locally.
*/
if (!strcasecmp(key, "Date")) {
parsed_date = parsedate(value);
if (parsed_date < 0L) parsed_date = time(NULL);
snprintf(buf, sizeof buf, "%ld", (long)parsed_date );
if (msg->cm_fields['T'] == NULL)
msg->cm_fields['T'] = strdup(buf);
processed = 1;
}
else if (!strcasecmp(key, "From")) {
process_rfc822_addr(value, user, node, name);
syslog(LOG_DEBUG, "Converted to <%s@%s> (%s)\n", user, node, name);
snprintf(addr, sizeof addr, "%s@%s", user, node);
if (msg->cm_fields['A'] == NULL)
msg->cm_fields['A'] = strdup(name);
if (msg->cm_fields['F'] == NULL)
msg->cm_fields['F'] = strdup(addr);
processed = 1;
}
else if (!strcasecmp(key, "Subject")) {
if (msg->cm_fields['U'] == NULL)
msg->cm_fields['U'] = strndup(value, valuelen);
processed = 1;
}
else if (!strcasecmp(key, "List-ID")) {
if (msg->cm_fields['L'] == NULL)
msg->cm_fields['L'] = strndup(value, valuelen);
processed = 1;
}
else if (!strcasecmp(key, "To")) {
if (msg->cm_fields['R'] == NULL)
msg->cm_fields['R'] = strndup(value, valuelen);
processed = 1;
}
else if (!strcasecmp(key, "CC")) {
if (msg->cm_fields['Y'] == NULL)
msg->cm_fields['Y'] = strndup(value, valuelen);
processed = 1;
}
else if (!strcasecmp(key, "Message-ID")) {
if (msg->cm_fields['I'] != NULL) {
syslog(LOG_WARNING, "duplicate message id\n");
}
if (msg->cm_fields['I'] == NULL) {
msg->cm_fields['I'] = strndup(value, valuelen);
/* Strip angle brackets */
while (haschar(msg->cm_fields['I'], '<') > 0) {
strcpy(&msg->cm_fields['I'][0],
&msg->cm_fields['I'][1]);
}
for (i = 0; i<strlen(msg->cm_fields['I']); ++i)
if (msg->cm_fields['I'][i] == '>')
msg->cm_fields['I'][i] = 0;
}
processed = 1;
}
else if (!strcasecmp(key, "Return-Path")) {
if (msg->cm_fields['P'] == NULL)
msg->cm_fields['P'] = strndup(value, valuelen);
processed = 1;
}
else if (!strcasecmp(key, "Envelope-To")) {
if (msg->cm_fields['V'] == NULL)
msg->cm_fields['V'] = strndup(value, valuelen);
processed = 1;
}
else if (!strcasecmp(key, "References")) {
if (msg->cm_fields['W'] != NULL) {
free(msg->cm_fields['W']);
}
msg->cm_fields['W'] = strndup(value, valuelen);
processed = 1;
}
else if (!strcasecmp(key, "Reply-To")) {
if (msg->cm_fields['K'] != NULL) {
free(msg->cm_fields['K']);
}
msg->cm_fields['K'] = strndup(value, valuelen);
processed = 1;
}
else if (!strcasecmp(key, "In-reply-to")) {
if (msg->cm_fields['W'] == NULL) { /* References: supersedes In-reply-to: */
msg->cm_fields['W'] = strndup(value, valuelen);
}
processed = 1;
}
/* Clean up and move on. */
free(key); /* Don't free 'value', it's actually the same buffer */
return(processed);
}
/*
* Convert RFC822 references format (References) to Citadel references format (Weferences)
*/
void convert_references_to_wefewences(char *str) {
int bracket_nesting = 0;
char *ptr = str;
char *moveptr = NULL;
char ch;
while(*ptr) {
ch = *ptr;
if (ch == '>') {
--bracket_nesting;
if (bracket_nesting < 0) bracket_nesting = 0;
}
if ((ch == '>') && (bracket_nesting == 0) && (*(ptr+1)) && (ptr>str) ) {
*ptr = '|';
++ptr;
}
else if (bracket_nesting > 0) {
++ptr;
}
else {
moveptr = ptr;
while (*moveptr) {
*moveptr = *(moveptr+1);
++moveptr;
}
}
if (ch == '<') ++bracket_nesting;
}
}
/*
* Convert an RFC822 message (headers + body) to a CtdlMessage structure.
* NOTE: the supplied buffer becomes part of the CtdlMessage structure, and
* will be deallocated when CtdlFreeMessage() is called. Therefore, the
* supplied buffer should be DEREFERENCED. It should not be freed or used
* again.
*/
struct CtdlMessage *convert_internet_message(char *rfc822) {
StrBuf *RFCBuf = NewStrBufPlain(rfc822, -1);
free (rfc822);
return convert_internet_message_buf(&RFCBuf);
}
struct CtdlMessage *convert_internet_message_buf(StrBuf **rfc822)
{
struct CtdlMessage *msg;
const char *pos, *beg, *end, *totalend;
int done, alldone = 0;
char buf[SIZ];
int converted;
StrBuf *OtherHeaders;
msg = malloc(sizeof(struct CtdlMessage));
if (msg == NULL) return msg;
memset(msg, 0, sizeof(struct CtdlMessage));
msg->cm_magic = CTDLMESSAGE_MAGIC; /* self check */
msg->cm_anon_type = 0; /* never anonymous */
msg->cm_format_type = FMT_RFC822; /* internet message */
pos = ChrPtr(*rfc822);
totalend = pos + StrLength(*rfc822);
done = 0;
OtherHeaders = NewStrBufPlain(NULL, StrLength(*rfc822));
while (!alldone) {
/* Locate beginning and end of field, keeping in mind that
* some fields might be multiline
*/
end = beg = pos;
while ((end < totalend) &&
(end == beg) &&
(done == 0) )
{
if ( (*pos=='\n') && ((*(pos+1))!=0x20) && ((*(pos+1))!=0x09) )
{
end = pos;
}
/* done with headers? */
if ((*pos=='\n') &&
( (*(pos+1)=='\n') ||
(*(pos+1)=='\r')) )
{
alldone = 1;
}
if (pos >= (totalend - 1) )
{
end = pos;
done = 1;
}
++pos;
}
/* At this point we have a field. Are we interested in it? */
converted = convert_field(msg, beg, end);
/* Strip the field out of the RFC822 header if we used it */
if (!converted) {
StrBufAppendBufPlain(OtherHeaders, beg, end - beg, 0);
StrBufAppendBufPlain(OtherHeaders, HKEY("\n"), 0);
}
/* If we've hit the end of the message, bail out */
if (pos >= totalend)
alldone = 1;
}
StrBufAppendBufPlain(OtherHeaders, HKEY("\n"), 0);
if (pos < totalend)
StrBufAppendBufPlain(OtherHeaders, pos, totalend - pos, 0);
FreeStrBuf(rfc822);
msg->cm_fields['M'] = SmashStrBuf(&OtherHeaders);
/* Follow-up sanity checks... */
/* If there's no timestamp on this message, set it to now. */
if (msg->cm_fields['T'] == NULL) {
snprintf(buf, sizeof buf, "%ld", (long)time(NULL));
msg->cm_fields['T'] = strdup(buf);
}
/* If a W (references, or rather, Wefewences) field is present, we
* have to convert it from RFC822 format to Citadel format.
*/
if (msg->cm_fields['W'] != NULL) {
convert_references_to_wefewences(msg->cm_fields['W']);
}
return msg;
}
/*
* Look for a particular header field in an RFC822 message text. If the
* requested field is found, it is unfolded (if necessary) and returned to
* the caller. The field name is stripped out, leaving only its contents.
* The caller is responsible for freeing the returned buffer. If the requested
* field is not present, or anything else goes wrong, it returns NULL.
*/
char *rfc822_fetch_field(const char *rfc822, const char *fieldname) {
char *fieldbuf = NULL;
const char *end_of_headers;
const char *field_start;
const char *ptr;
char *cont;
char fieldhdr[SIZ];
/* Should never happen, but sometimes we get stupid */
if (rfc822 == NULL) return(NULL);
if (fieldname == NULL) return(NULL);
snprintf(fieldhdr, sizeof fieldhdr, "%s:", fieldname);
/* Locate the end of the headers, so we don't run past that point */
end_of_headers = cbmstrcasestr(rfc822, "\n\r\n");
if (end_of_headers == NULL) {
end_of_headers = cbmstrcasestr(rfc822, "\n\n");
}
if (end_of_headers == NULL) return (NULL);
field_start = cbmstrcasestr(rfc822, fieldhdr);
if (field_start == NULL) return(NULL);
if (field_start > end_of_headers) return(NULL);
fieldbuf = malloc(SIZ);
strcpy(fieldbuf, "");
ptr = field_start;
ptr = cmemreadline(ptr, fieldbuf, SIZ-strlen(fieldbuf) );
while ( (isspace(ptr[0])) && (ptr < end_of_headers) ) {
strcat(fieldbuf, " ");
cont = &fieldbuf[strlen(fieldbuf)];
ptr = cmemreadline(ptr, cont, SIZ-strlen(fieldbuf) );
striplt(cont);
}
strcpy(fieldbuf, &fieldbuf[strlen(fieldhdr)]);
striplt(fieldbuf);
return(fieldbuf);
}
/*****************************************************************************
* DIRECTORY MANAGEMENT FUNCTIONS *
*****************************************************************************/
/*
* Generate the index key for an Internet e-mail address to be looked up
* in the database.
*/
void directory_key(char *key, char *addr) {
int i;
int keylen = 0;
for (i=0; !IsEmptyStr(&addr[i]); ++i) {
if (!isspace(addr[i])) {
key[keylen++] = tolower(addr[i]);
}
}
key[keylen++] = 0;
syslog(LOG_DEBUG, "Directory key is <%s>\n", key);
}
/* Return nonzero if the supplied address is in a domain we keep in
* the directory
*/
int IsDirectory(char *addr, int allow_masq_domains) {
char domain[256];
int h;
extract_token(domain, addr, 1, '@', sizeof domain);
striplt(domain);
h = CtdlHostAlias(domain);
if ( (h == hostalias_masq) && allow_masq_domains)
return(1);
if ( (h == hostalias_localhost) || (h == hostalias_directory) ) {
return(1);
}
else {
return(0);
}
}
/*
* Initialize the directory database (erasing anything already there)
*/
void CtdlDirectoryInit(void) {
cdb_trunc(CDB_DIRECTORY);
}
/*
* Add an Internet e-mail address to the directory for a user
*/
int CtdlDirectoryAddUser(char *internet_addr, char *citadel_addr) {
char key[SIZ];
if (IsDirectory(internet_addr, 0) == 0)
return 0;
syslog(LOG_DEBUG, "Create directory entry: %s --> %s\n", internet_addr, citadel_addr);
directory_key(key, internet_addr);
cdb_store(CDB_DIRECTORY, key, strlen(key), citadel_addr, strlen(citadel_addr)+1 );
return 1;
}
/*
* Delete an Internet e-mail address from the directory.
*
* (NOTE: we don't actually use or need the citadel_addr variable; it's merely
* here because the callback API expects to be able to send it.)
*/
int CtdlDirectoryDelUser(char *internet_addr, char *citadel_addr) {
char key[SIZ];
syslog(LOG_DEBUG, "Delete directory entry: %s --> %s\n", internet_addr, citadel_addr);
directory_key(key, internet_addr);
return cdb_delete(CDB_DIRECTORY, key, strlen(key) ) == 0;
}
/*
* Look up an Internet e-mail address in the directory.
* On success: returns 0, and Citadel address stored in 'target'
* On failure: returns nonzero
*/
int CtdlDirectoryLookup(char *target, char *internet_addr, size_t targbuflen) {
struct cdbdata *cdbrec;
char key[SIZ];
/* Dump it in there unchanged, just for kicks */
safestrncpy(target, internet_addr, targbuflen);
/* Only do lookups for addresses with hostnames in them */
if (num_tokens(internet_addr, '@') != 2) return(-1);
/* Only do lookups for domains in the directory */
if (IsDirectory(internet_addr, 0) == 0) return(-1);
directory_key(key, internet_addr);
cdbrec = cdb_fetch(CDB_DIRECTORY, key, strlen(key) );
if (cdbrec != NULL) {
safestrncpy(target, cdbrec->ptr, targbuflen);
cdb_free(cdbrec);
return(0);
}
return(-1);
}
/*
* Harvest any email addresses that someone might want to have in their
* "collected addresses" book.
*/
char *harvest_collected_addresses(struct CtdlMessage *msg) {
char *coll = NULL;
char addr[256];
char user[256], node[256], name[256];
int is_harvestable;
int i, j, h;
int field = 0;
if (msg == NULL) return(NULL);
is_harvestable = 1;
strcpy(addr, "");
if (msg->cm_fields['A'] != NULL) {
strcat(addr, msg->cm_fields['A']);
}
if (msg->cm_fields['F'] != NULL) {
strcat(addr, " <");
strcat(addr, msg->cm_fields['F']);
strcat(addr, ">");
if (IsDirectory(msg->cm_fields['F'], 0)) {
is_harvestable = 0;
}
}
if (is_harvestable) {
coll = strdup(addr);
}
else {
coll = strdup("");
}
if (coll == NULL) return(NULL);
/* Scan both the R (To) and Y (CC) fields */
for (i = 0; i < 2; ++i) {
if (i == 0) field = 'R' ;
if (i == 1) field = 'Y' ;
if (msg->cm_fields[field] != NULL) {
for (j=0; j<num_tokens(msg->cm_fields[field], ','); ++j) {
extract_token(addr, msg->cm_fields[field], j, ',', sizeof addr);
if (strstr(addr, "=?") != NULL)
utf8ify_rfc822_string(addr);
process_rfc822_addr(addr, user, node, name);
h = CtdlHostAlias(node);
if ( (h != hostalias_localhost) && (h != hostalias_directory) ) {
coll = realloc(coll, strlen(coll) + strlen(addr) + 4);
if (coll == NULL) return(NULL);
if (!IsEmptyStr(coll)) {
strcat(coll, ",");
}
striplt(addr);
strcat(coll, addr);
}
}
}
}
if (IsEmptyStr(coll)) {
free(coll);
return(NULL);
}
return(coll);
}