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* "browse_callback", and parts of "main".
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* Everything else is
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* Copyright © 2008-2011 Teddy Hogeborn
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* Copyright © 2008-2011 Björn Påhlsson
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* Copyright © 2008,2009 Teddy Hogeborn
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* Copyright © 2008,2009 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, srand(),
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#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
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srand(), strtof(), abort() */
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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(), sleep() */
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#include <time.h> /* nanosleep(), time() */
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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 <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 <sysexits.h> /* EX_OSERR, EX_USAGE */
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#include <sys/klog.h> /* klogctl() */
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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 = "";
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const char *interface = "eth0";
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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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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 = EX_OSERR;
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exitcode = EXIT_FAILURE;
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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 = EX_OSERR;
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exitcode = EXIT_FAILURE;
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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 = EX_OSERR;
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exitcode = EXIT_FAILURE;
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/* If the interface is down, bring it up */
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if(strcmp(interface, "none") != 0){
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if(interface[0] != '\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 = EX_UNAVAILABLE;
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exitcode = EXIT_FAILURE;
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ret = ioctl(sd, SIOCSIFFLAGS, &network);
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take_down_interface = false;
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perror("ioctl SIOCSIFFLAGS +IFF_UP");
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exitcode = EX_OSERR;
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perror("ioctl SIOCSIFFLAGS");
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exitcode = EXIT_FAILURE;
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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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/* Removes the GPGME temp directory and all files inside */
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/* Removes the temp directory used by GPGME */
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if(tempdir_created){
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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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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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char *fullname = NULL;
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ret = asprintf(&fullname, "%s/%s", tempdir,
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direntry->d_name);