view src/mlmmj-bounce.c @ 797:c3ee2bfaeb02

Implement new list text naming scheme Also fix a bug where the normal list text would be sent when unsubscribing from the nomail version of the list Also fix some minor documentation bugs
author Ben Schmidt
date Sat, 10 Sep 2011 12:23:40 +1000
parents f8f3f4525a2b
children 74d5ebb67b34
line wrap: on
line source

/* Copyright (C) 2004 Morten K. Poulsen <morten at afdelingp.dk>
 *
 * $Id$
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <time.h>
#include <dirent.h>
#include <sys/mman.h>
#include <string.h>
#include <ctype.h>

#include "getlistaddr.h"
#include "getlistdelim.h"
#include "mlmmj.h"
#include "strgen.h"
#include "wrappers.h"
#include "log_error.h"
#include "subscriberfuncs.h"
#include "mygetline.h"
#include "chomp.h"
#include "prepstdreply.h"
#include "memory.h"
#include "find_email_adr.h"
#include "gethdrline.h"

char *fetchindexes(const char *bouncefile)
{
	int fd;
	char *indexstr = NULL, *s, *start, *line, *cur, *colon, *next;
	size_t len;
	struct stat st;

	fd = open(bouncefile, O_RDONLY);
	if(fd < 0) {
		log_error(LOG_ARGS, "Could not open bounceindexfile %s",
				bouncefile);
		return NULL;
	}

	if(fstat(fd, &st) < 0) {
		log_error(LOG_ARGS, "Could not open bounceindexfile %s",
					bouncefile);
	}

	if(st.st_size == 0) {
		log_error(LOG_ARGS, "Bounceindexfile %s is size 0",
					bouncefile);
		return NULL;
	}

	start = mmap(0, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
	if(start == MAP_FAILED) {
		log_error(LOG_ARGS, "Could not mmap bounceindexfile");
		return NULL;
	}


	for(next = cur = start; next < start + st.st_size; next++) {
		if(*next == '\n') {
			len = next - cur;
			line = mymalloc(len + 1);
			strncpy(line, cur, len);
			line[len] = '\0';
			cur = next + 1;
		} else
	 		continue;

		colon = strchr(line, ':');
		MY_ASSERT(colon);
		*colon = '\0';
		s = indexstr;
		indexstr = concatstr(4, s, "        ", line, "\n");
		myfree(s);
		myfree(line);
	}

	munmap(start, st.st_size);
	close(fd);

	return indexstr;
}

void do_probe(const char *listdir, const char *mlmmjsend, const char *addr)
{
	char *myaddr, *from, *a, *indexstr, *queuefilename, *listaddr;
	char *listfqdn, *listname, *probefile, *listdelim=getlistdelim(listdir);
	char *maildata[] = { "bouncenumbers", NULL };
	int fd;
	time_t t;

	myaddr = mystrdup(addr);

	listaddr = getlistaddr(listdir);
	listname = genlistname(listaddr);
	listfqdn = genlistfqdn(listaddr);

	from = concatstr(6, listname, listdelim, "bounces-probe-", myaddr, "@",
			 listfqdn);

	myfree(listaddr);
	myfree(listdelim);
	myfree(listfqdn);
	myfree(listname);

	a = strrchr(myaddr, '=');
	if (!a) {
		myfree(myaddr);
		myfree(from);
		log_error(LOG_ARGS, "do_probe(): malformed address");
		exit(EXIT_FAILURE);

	}
	*a = '@';

	indexstr = fetchindexes(addr);
	if(indexstr == NULL) {
		log_error(LOG_ARGS, "Could not fetch bounceindexes");
		exit(EXIT_FAILURE);
	}

	maildata[1] = indexstr;
	queuefilename = prepstdreply(listdir,
			"probe", NULL, NULL, NULL, "bounce-probe",
			"$listowner$", myaddr, NULL, 1, maildata, NULL);
	MY_ASSERT(queuefilename);
	myfree(indexstr);

	probefile = concatstr(4, listdir, "/bounce/", addr, "-probe");
	MY_ASSERT(probefile);
	t = time(NULL);
	a = mymalloc(32);
	snprintf(a, 31, "%ld", (long int)t);
	a[31] = '\0';
	unlink(probefile);
	fd = open(probefile, O_WRONLY|O_TRUNC|O_CREAT, S_IRUSR|S_IWUSR);
	if(fd < 0)
		log_error(LOG_ARGS, "Could not open %s", probefile);
	else
		if(writen(fd, a, strlen(a)) < 0)
			log_error(LOG_ARGS, "Could not write time in probe");

	myfree(probefile);

	execlp(mlmmjsend, mlmmjsend,
				"-l", "5",
				"-L", listdir,
				"-T", myaddr,
				"-F", from,
				"-m", queuefilename, (char *)NULL);

	log_error(LOG_ARGS, "execlp() of '%s' failed", mlmmjsend);

	exit(EXIT_FAILURE);
}

char *dsnparseaddr(const char *mailname)
{
	int fd, indsn = 0, i;
	char *line, *linedup, *search, *addr = NULL;
	struct email_container emails = { 0, NULL };

	fd = open(mailname, O_RDONLY);
	if(fd < 0) {
		log_error(LOG_ARGS, "Could not open bounceindexfile %s",
				mailname);
		return NULL;
	}

	while((line = gethdrline(fd))) {
		linedup = mystrdup(line);
		for(i = 0; line[i]; i++)
			linedup[i] = tolower(line[i]);
		search = strstr(linedup, "message/delivery-status");
		myfree(linedup);
		if(search)
			indsn = 1;
		if(indsn) {
			i = strncasecmp(line, "Final-Recipient:", 16);
			if(i == 0) {
				find_email_adr(line, &emails);
				if(emails.emailcount > 0) {
					addr = mystrdup(emails.emaillist[0]);
					for(i = 0; i < emails.emailcount; i++)
						myfree(emails.emaillist[i]);
					myfree(emails.emaillist);
				} else {
					addr = NULL;
				}
				myfree(line);
				return addr;
			}
		}
		myfree(line);
	}

	return NULL;
}

static void print_help(const char *prg)
{
	printf("Usage: %s -L /path/to/list\n"
	       "       -a john=doe.org [-n num | -p]\n"
	       " -a: Address string that bounces\n"
	       " -h: This help\n"
	       " -L: Full path to list directory\n"
	       " -n: Message number in the archive\n"
	       " -p: Send out a probe\n"
	       " -V: Print version\n", prg);

	exit(EXIT_SUCCESS);
}

int main(int argc, char **argv)
{
	int opt, fd, dsnbounce = 0, i = 0;
	char *listdir = NULL, *address = NULL, *number = NULL;
	char *bindir, *mlmmjsend, *savename;
	char *mailname = NULL, *bfilename, *a, *buf, *lowcaseaddr;
	size_t len;
	time_t t;
	int probe = 0;
	struct stat st;
	uid_t uid;

	log_set_name(argv[0]);

	CHECKFULLPATH(argv[0]);

	bindir = mydirname(argv[0]);
	mlmmjsend = concatstr(2, bindir, "/mlmmj-send");
	myfree(bindir);

	while ((opt = getopt(argc, argv, "hdVL:a:n:m:p")) != -1) {
		switch(opt) {
		case 'L':
			listdir = optarg;
			break;
		case 'a':
			address = optarg;
			break;
		case 'd':
			dsnbounce = 1;
			break;
		case 'm':
			mailname = optarg;
			break;
		case 'n':
			number = optarg;
			break;
		case 'p':
			probe = 1;
			break;
		case 'h':
			print_help(argv[0]);
			break;
		case 'V':
			print_version(argv[0]);
			exit(0);
		}
	}

	if(listdir == NULL || (address == NULL && dsnbounce == 0)
				|| (number == NULL && probe == 0)) {
		fprintf(stderr,
			"You have to specify -L, -a or -d and -n or -p\n");
		fprintf(stderr, "%s -h for help\n", argv[0]);
		exit(EXIT_FAILURE);
	}

	/* Lets make sure no random user tries to do bouncehandling */
	if(listdir) {
		if(stat(listdir, &st) == 0) {
			uid = getuid();
			if(uid && uid != st.st_uid) {
				log_error(LOG_ARGS,
					"Have to invoke either as root "
					"or as the user owning listdir");
				writen(STDERR_FILENO,
					"Have to invoke either as root "
					"or as the user owning listdir\n", 60);
				exit(EXIT_FAILURE);
			}
		} else {
			log_error(LOG_ARGS, "Could not stat %s", listdir);
			exit(EXIT_FAILURE);
		}
	}

	if(dsnbounce) {
		address = dsnparseaddr(mailname);

		/* Delete the mailfile, no need for it anymore */
		if(mailname)
			unlink(mailname);

		if(address == NULL)
			exit(EXIT_SUCCESS);

		a = strrchr(address, '@');
		MY_ASSERT(a);
		*a = '=';
	}

	/* Make the address lowercase */
	lowcaseaddr = mystrdup(address);
	i = 0;
	while(lowcaseaddr[i]) {
		lowcaseaddr[i] = tolower(lowcaseaddr[i]);
		i++;
	}
	address = lowcaseaddr;

	if(number != NULL && probe != 0) {
		fprintf(stderr, "You can only specify one of -n or -p\n");
		fprintf(stderr, "%s -h for help\n", argv[0]);
		exit(EXIT_FAILURE);
	}

	if (probe) {
		/* send out a probe */
		do_probe(listdir, mlmmjsend, address);
		/* do_probe() will never return */
		exit(EXIT_FAILURE);
	}

#if 0
	log_error(LOG_ARGS, "listdir = [%s] address = [%s] number = [%s]", listdir, address, number);
#endif

	/* check if it's sub/unsub requests bouncing, and in that case
	 * simply remove the confirmation file. Variablenames address and
	 * number are a bit misleading in this case due to the different
	 * construction of the sub/unsub confirmation From header.
	 */
	if(strcmp(number, "confsub") == 0) {
		a = concatstr(3, listdir, "/subconf/", address);
		unlink(a);
		myfree(a);
		if(mailname)
			unlink(mailname);
		exit(EXIT_SUCCESS);
	}
	if(strcmp(number, "confunsub") == 0) {
		a = concatstr(3, listdir, "/unsubconf/", address);
		unlink(a);
		myfree(a);
		if(mailname)
			unlink(mailname);
		exit(EXIT_SUCCESS);
	}
	/* Below checks for bounce probes bouncing. If they do, simply remove
	 * the probe file and exit successfully. Yes, I know the variables
	 * have horrible names, but please bear with me.
	 */
	if(strcmp(number, "probe") == 0) {
		a = concatstr(4, listdir, "/bounce/", address, "-probe");
		unlink(a);
		unlink(mailname);
		myfree(a);
		exit(EXIT_SUCCESS);
	}

	/* save the filename with '=' before replacing it with '@' */
	bfilename = concatstr(3, listdir, "/bounce/", address);

	a = strrchr(address, '=');
	if (!a) {
		if(mailname)
			unlink(mailname);
		exit(EXIT_SUCCESS);  /* ignore malformed address */
	}
	*a = '@';

	/* make sure it's a subscribed address */
	if(is_subbed(listdir, address)) {
		log_error(LOG_ARGS, "%s is bouncing but not subscribed?",
				address);
		if(mailname)
			unlink(mailname);
		myfree(bfilename);
		exit(EXIT_SUCCESS); /* Not subbed, so exit silently */
	}

	if(lstat(bfilename, &st) == 0) {
		if((st.st_mode & S_IFLNK) == S_IFLNK) {
			log_error(LOG_ARGS, "%s is a symbolic link",
					bfilename);
			exit(EXIT_FAILURE);
		}
	}

	if ((fd = open(bfilename, O_WRONLY|O_APPEND|O_CREAT,
			S_IRUSR|S_IWUSR)) < 0) {
		log_error(LOG_ARGS, "Could not open '%s'", bfilename);
		myfree(bfilename);
		exit(EXIT_FAILURE);
	}

	/* TODO check that the message is not already bounced */

	/* XXX How long can the string representation of an integer be?
	 * It is not a security issue (we use snprintf()), but it would be
	 * bad mojo to cut the timestamp field  -- mortenp 20040427 */

	/* int + ":" + int + " # Wed Jun 30 21:49:08 1993\n" + NUL */
	len = 20 + 1 + 20 + 28 + 1;

	buf = mymalloc(len);
	if (!buf) exit(EXIT_FAILURE);

	t = time(NULL);
	snprintf(buf, len-26, "%s:%ld # ", number, (long int)t);
	ctime_r(&t, buf+strlen(buf));
	writen(fd, buf, strlen(buf));
	close(fd);

	if(mailname) {
		savename = concatstr(2, bfilename, ".lastmsg");
		rename(mailname, savename);
		myfree(savename);
	}

	myfree(bfilename);
	if(dsnbounce && address)
		myfree(address);

	return EXIT_SUCCESS;
}