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/**
* \file local.c
* Local delivery of mail via a MDA.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <pwd.h>
#include "local.h"
#include "main.h"
#if 0
char *mda = NULL;
#else
char *mda = "/usr/bin/procmail -d %T";
#endif
FILE *mda_fp = NULL;
int local_address(const char *address)
{
return !strchr(address, '@');
}
/** replace ' by _ */
static void sanitize(char *s)
{
char *cp;
for (cp = s; (cp = strchr (cp, '\'')); cp++)
*cp = '_';
}
#define xmalloc malloc
#define xstrdup strdup
#define HAVE_SETEUID
/**
* Pipe the message to the MDA for local delivery.
*
* Based on fetchmail's open_mda_sink().
*/
int local_init(message_t *message)
{
#ifdef HAVE_SETEUID
uid_t orig_uid, uid;
struct passwd *pw;
#endif /* HAVE_SETEUID */
struct idlist *idp;
int length = 0, fromlen = 0, nameslen = 0;
char *names = NULL, *before, *after, *from = NULL;
char *user = NULL;
if (!mda)
return 1;
length = strlen(mda);
before = xstrdup(mda);
/* get user addresses for %T */
if (strstr(before, "%T"))
{
struct list_head *ptr;
/*
* We go through this in order to be able to handle very
* long lists of users and (re)implement %s.
*/
nameslen = 0;
list_for_each(ptr, &message->local_recipients)
{
recipient_t *recipient = list_entry(ptr, recipient_t, list);
if(recipient->address)
nameslen += (strlen(recipient->address) + 1); /* string + ' ' */
}
names = (char *)xmalloc(nameslen + 1); /* account for '\0' */
names[0] = '\0';
list_for_each(ptr, &message->local_recipients)
{
recipient_t *recipient = list_entry(ptr, recipient_t, list);
if(recipient->address)
{
if(!user)
user = recipient->address;
strcat(names, recipient->address);
strcat(names, " ");
}
}
names[--nameslen] = '\0'; /* chop trailing space */
sanitize(names);
}
/* get From address for %F */
if (strstr(before, "%F"))
{
from = xstrdup(message->reverse_path);
sanitize(from);
fromlen = strlen(from);
}
/* do we have to build an mda string? */
if (names || from)
{
char *sp, *dp;
/* find length of resulting mda string */
sp = before;
while ((sp = strstr(sp, "%s"))) {
length += nameslen; /* subtract %s and add '' */
sp += 2;
}
sp = before;
while ((sp = strstr(sp, "%T"))) {
length += nameslen; /* subtract %T and add '' */
sp += 2;
}
sp = before;
while ((sp = strstr(sp, "%F"))) {
length += fromlen; /* subtract %F and add '' */
sp += 2;
}
after = xmalloc(length + 1);
/* copy mda source string to after, while expanding %[sTF] */
for (dp = after, sp = before; (*dp = *sp); dp++, sp++) {
if (sp[0] != '%') continue;
/* need to expand? BTW, no here overflow, because in
** the worst case (end of string) sp[1] == '\0' */
if (sp[1] == 'T') {
*dp++ = '\'';
strcpy(dp, names);
dp += nameslen;
*dp++ = '\'';
sp++; /* position sp over [sT] */
dp--; /* adjust dp */
} else if (sp[1] == 'F') {
*dp++ = '\'';
strcpy(dp, from);
dp += fromlen;
*dp++ = '\'';
sp++; /* position sp over F */
dp--; /* adjust dp */
}
}
if (names) {
free(names);
names = NULL;
}
if (from) {
free(from);
from = NULL;
}
free(before);
before = after;
}
#ifdef HAVE_SETEUID
/*
* Arrange to run with user's permissions if we're root.
* This will initialize the ownership of any files the
* MDA creates properly. (The seteuid call is available
* under all BSDs and Linux)
*/
orig_uid = getuid();
/* if `user' doesn't name a real local user, try to run as root */
if ((pw = getpwnam(user)) == (struct passwd *)NULL)
uid = 0;
else
uid = pw->pw_uid; /* for local delivery via MDA */
seteuid(uid);
#endif /* HAVE_SETEUID */
mda_fp = popen(before, "w");
#ifdef HAVE_SETEUID
/* this will fail quietly if we didn't start as root */
seteuid(orig_uid);
#endif /* HAVE_SETEUID */
if (!mda_fp)
{
free(before);
before = NULL;
fprintf(stderr, "MDA open failed\n");
return 0;
}
if(verbose)
fprintf(stdout, "Connected to MDA: %s\n", before);
free(before);
before = NULL;
return 1;
}
int local_flush(message_t *message)
{
char buffer[BUFSIZ];
size_t n;
do {
n = message_read(message, buffer, BUFSIZ);
if(fwrite(buffer, 1, n, mda_fp) != n)
return 0;
} while(n == BUFSIZ);
return 1;
}
void local_cleanup(void)
{
if(mda_fp)
{
fclose(mda_fp);
mda_fp = NULL;
if(verbose)
fprintf(stdout, "Disconnected to MDA\n");
}
}
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