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* "browse_callback", and parts of "main".
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* Everything else is
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* Copyright © 2008,2009 Teddy Hogeborn
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* Copyright © 2008,2009 Björn Påhlsson
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* Copyright © 2008-2011 Teddy Hogeborn
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* Copyright © 2008-2011 Björn Påhlsson
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* This program is free software: you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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stdout, ferror(), remove() */
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#include <stdint.h> /* uint16_t, uint32_t */
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#include <stddef.h> /* NULL, size_t, ssize_t */
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#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
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#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
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#include <stdbool.h> /* bool, false, true */
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#include <string.h> /* memset(), strcmp(), strlen(),
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strerror(), asprintf(), strcpy() */
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#include <assert.h> /* assert() */
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#include <errno.h> /* perror(), errno */
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#include <time.h> /* nanosleep(), time() */
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#include <time.h> /* nanosleep(), time(), sleep() */
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#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
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SIOCSIFFLAGS, if_indextoname(),
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if_nametoindex(), IF_NAMESIZE */
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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
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getuid(), getgid(), seteuid(),
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#include <arpa/inet.h> /* inet_pton(), htons */
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#include <iso646.h> /* not, or, and */
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#include <argp.h> /* struct argp_option, error_t, struct
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#include <signal.h> /* sigemptyset(), sigaddset(),
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sigaction(), SIGTERM, sig_atomic_t,
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#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
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EX_NOHOST, EX_IOERR, EX_PROTOCOL */
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#include <sys/klog.h> /* klogctl() */
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static void empty_log(__attribute__((unused)) AvahiLogLevel level,
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__attribute__((unused)) const char *txt){}
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sig_atomic_t quit_now = 0;
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int signal_received = 0;
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/* Called when a Mandos server is found */
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static int start_mandos_communication(const char *ip, uint16_t port,
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AvahiIfIndex if_index,
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ret = gnutls_handshake(session);
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} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
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fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
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gnutls_perror(ret);
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fprintf(stderr, "Unknown error while reading data from"
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" encrypted session with Mandos server\n");
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gnutls_bye(session, GNUTLS_SHUT_RDWR);
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errno = old_errno;
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* This function determines if a directory entry in /sys/class/net
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* corresponds to an acceptable network device.
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* (This function is passed to scandir(3) as a filter function.)
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int good_interface(const struct dirent *if_entry){
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char *flagname = NULL;
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if(if_entry->d_name[0] == '.'){
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int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
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int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
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typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
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/* read line from flags_fd */
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ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
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char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
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flagstring[(size_t)to_read] = '\0';
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if(flagstring == NULL){
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ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
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tmpmax = strtoimax(flagstring, &tmp, 0);
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if(errno != 0 or tmp == flagstring or (*tmp != '\0'
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and not (isspace(*tmp)))
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or tmpmax != (ifreq_flags)tmpmax){
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fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
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flagstring, if_entry->d_name);
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ifreq_flags flags = (ifreq_flags)tmpmax;
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/* Reject the loopback device */
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if(flags & IFF_LOOPBACK){
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fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
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/* Accept point-to-point devices only if connect_to is specified */
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if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
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fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
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/* Otherwise, reject non-broadcast-capable devices */
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if(not (flags & IFF_BROADCAST)){
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fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
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/* Reject non-ARP interfaces (including dummy interfaces) */
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if(flags & IFF_NOARP){
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fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
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/* Accept this device */
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fprintf(stderr, "Interface \"%s\" is acceptable\n",
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int notdotentries(const struct dirent *direntry){
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/* Skip "." and ".." */
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if(direntry->d_name[0] == '.'
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and (direntry->d_name[1] == '\0'
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or (direntry->d_name[1] == '.'
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and direntry->d_name[2] == '\0'))){
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int main(int argc, char *argv[]){
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AvahiSServiceBrowser *sb = NULL;
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intmax_t tmpmax;
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int exitcode = EXIT_SUCCESS;
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const char *interface = "eth0";
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const char *interface = "";
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struct ifreq network;
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bool take_down_interface = false;
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char *connect_to = NULL;
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char tempdir[] = "/tmp/mandosXXXXXX";
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bool tempdir_created = false;
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AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
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.arg = "SECONDS",
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.doc = "Maximum delay to wait for interface startup",
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* These reproduce what we would get without ARGP_NO_HELP
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{ .name = "help", .key = '?',
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.doc = "Give this help list", .group = -1 },
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{ .name = "usage", .key = -3,
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.doc = "Give a short usage message", .group = -1 },
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{ .name = "version", .key = 'V',
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.doc = "Print program version", .group = -1 },
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{ .name = NULL }
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error_t parse_opt(int key, char *arg,
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struct argp_state *state){
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case 128: /* --debug */
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tmpmax = strtoimax(arg, &tmp, 10);
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if(errno != 0 or tmp == arg or *tmp != '\0'
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or tmpmax != (typeof(mc.dh_bits))tmpmax){
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fprintf(stderr, "Bad number of DH bits\n");
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argp_error(state, "Bad number of DH bits");
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mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
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delay = strtof(arg, &tmp);
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if(errno != 0 or tmp == arg or *tmp != '\0'){
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fprintf(stderr, "Bad delay\n");
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argp_error(state, "Bad delay");
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* These reproduce what we would get without ARGP_NO_HELP
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case '?': /* --help */
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argp_state_help(state, state->out_stream,
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(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
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& ~(unsigned int)ARGP_HELP_EXIT_OK);
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case -3: /* --usage */
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argp_state_help(state, state->out_stream,
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ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
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case 'V': /* --version */
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fprintf(state->out_stream, "%s\n", argp_program_version);
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exit(argp_err_exit_status);
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return ARGP_ERR_UNKNOWN;
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struct argp argp = { .options = options, .parser = parse_opt,
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.args_doc = "",
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.doc = "Mandos client -- Get and decrypt"
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" passwords from a Mandos server" };
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ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
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if(ret == ARGP_ERR_UNKNOWN){
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fprintf(stderr, "Unknown error while parsing arguments\n");
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exitcode = EXIT_FAILURE;
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ret = argp_parse(&argp, argc, argv,
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ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
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perror("argp_parse");
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exitcode = EX_OSERR;
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exitcode = EX_USAGE;
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avahi_set_log_function(empty_log);
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if(interface[0] == '\0'){
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struct dirent **direntries;
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ret = scandir(sys_class_net, &direntries, good_interface,
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/* Pick the first good interface */
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interface = strdup(direntries[0]->d_name);
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fprintf(stderr, "Using interface \"%s\"\n", interface);
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if(interface == NULL){
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exitcode = EXIT_FAILURE;
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fprintf(stderr, "Could not find a network interface\n");
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exitcode = EXIT_FAILURE;
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/* Initialize Avahi early so avahi_simple_poll_quit() can be called
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from the signal handler */
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ret = sigaction(SIGINT, NULL, &old_sigterm_action);
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perror("sigaction");
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return EXIT_FAILURE;
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if(old_sigterm_action.sa_handler != SIG_IGN){
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ret = sigaction(SIGINT, &sigterm_action, NULL);
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perror("sigaction");
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exitcode = EXIT_FAILURE;
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exitcode = EX_OSERR;
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ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
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perror("sigaction");
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return EXIT_FAILURE;
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if(old_sigterm_action.sa_handler != SIG_IGN){
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ret = sigaction(SIGHUP, &sigterm_action, NULL);
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perror("sigaction");
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exitcode = EXIT_FAILURE;
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exitcode = EX_OSERR;
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ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
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perror("sigaction");
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return EXIT_FAILURE;
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if(old_sigterm_action.sa_handler != SIG_IGN){
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ret = sigaction(SIGTERM, &sigterm_action, NULL);
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perror("sigaction");
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exitcode = EXIT_FAILURE;
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exitcode = EX_OSERR;
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/* If the interface is down, bring it up */
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if(interface[0] != '\0'){
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if(strcmp(interface, "none") != 0){
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if_index = (AvahiIfIndex) if_nametoindex(interface);
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if(if_index == 0){
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fprintf(stderr, "No such interface: \"%s\"\n", interface);
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exitcode = EXIT_FAILURE;
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exitcode = EX_UNAVAILABLE;
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ret = ioctl(sd, SIOCSIFFLAGS, &network);
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take_down_interface = false;
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perror("ioctl SIOCSIFFLAGS");
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exitcode = EXIT_FAILURE;
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perror("ioctl SIOCSIFFLAGS +IFF_UP");
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exitcode = EX_OSERR;
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#ifdef __linux__
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if(restore_loglevel){
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ret = klogctl(7, NULL, 0);
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perror("ioctl SIOCGIFFLAGS");
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} else if(network.ifr_flags & IFF_UP) {
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network.ifr_flags &= ~IFF_UP; /* clear flag */
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network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
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ret = ioctl(sd, SIOCSIFFLAGS, &network);
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perror("ioctl SIOCSIFFLAGS");
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perror("ioctl SIOCSIFFLAGS -IFF_UP");
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ret = (int)TEMP_FAILURE_RETRY(close(sd));
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/* Removes the temp directory used by GPGME */
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/* Removes the GPGME temp directory and all files inside */
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if(tempdir_created){
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struct dirent *direntry;
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d = opendir(tempdir);
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if(errno != ENOENT){
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direntry = readdir(d);
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if(direntry == NULL){
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/* Skip "." and ".." */
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if(direntry->d_name[0] == '.'
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and (direntry->d_name[1] == '\0'
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or (direntry->d_name[1] == '.'
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and direntry->d_name[2] == '\0'))){
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struct dirent **direntries = NULL;
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struct dirent *direntry = NULL;
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ret = scandir(tempdir, &direntries, notdotentries, alphasort);
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for(int i = 0; i < ret; i++){
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direntry = direntries[i];
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char *fullname = NULL;
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ret = asprintf(&fullname, "%s/%s", tempdir,
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direntry->d_name);
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sigemptyset(&old_sigterm_action.sa_mask);
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old_sigterm_action.sa_handler = SIG_DFL;
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ret = sigaction(signal_received, &old_sigterm_action, NULL);
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ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
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&old_sigterm_action,
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perror("sigaction");
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raise(signal_received);
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ret = raise(signal_received);
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} while(ret != 0 and errno == EINTR);
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TEMP_FAILURE_RETRY(pause());
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return exitcode;