9
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* "browse_callback", and parts of "main".
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* 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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INET_ADDRSTRLEN, INET6_ADDRSTRLEN
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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
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getuid(), getgid(), setuid(),
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#include <arpa/inet.h> /* inet_pton(), htons */
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getuid(), getgid(), seteuid(),
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#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
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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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argp_state, struct argp,
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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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.dh_bits = 1024, .priority = "SECURE256"
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":!CTYPE-X.509:+CTYPE-OPENPGP" };
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sig_atomic_t quit_now = 0;
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int signal_received = 0;
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* Make additional room in "buffer" for at least BUFFER_SIZE more
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* bytes. "buffer_capacity" is how much is currently allocated,
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/* OpenPGP credentials */
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gnutls_certificate_allocate_credentials(&mc.cred);
426
ret = gnutls_certificate_allocate_credentials(&mc.cred);
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if(ret != GNUTLS_E_SUCCESS){
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fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
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fprintf(stderr, "GnuTLS memory error: %s\n",
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safer_gnutls_strerror(ret));
426
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gnutls_global_deinit();
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static int init_gnutls_session(gnutls_session_t *session){
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/* GnuTLS session creation */
477
ret = gnutls_init(session, GNUTLS_SERVER);
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ret = gnutls_init(session, GNUTLS_SERVER);
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} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
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if(ret != GNUTLS_E_SUCCESS){
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fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
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safer_gnutls_strerror(ret));
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
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ret = gnutls_priority_set_direct(*session, mc.priority, &err);
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gnutls_deinit(*session);
500
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
486
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if(ret != GNUTLS_E_SUCCESS){
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fprintf(stderr, "Syntax error at: %s\n", err);
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fprintf(stderr, "GnuTLS error: %s\n",
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ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
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ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
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gnutls_deinit(*session);
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} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
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if(ret != GNUTLS_E_SUCCESS){
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fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
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safer_gnutls_strerror(ret));
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static void empty_log(__attribute__((unused)) AvahiLogLevel level,
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__attribute__((unused)) const char *txt){}
517
sig_atomic_t quit_now = 0;
518
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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struct sockaddr_in6 in6;
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char *buffer = NULL;
531
char *decrypted_buffer;
548
char *decrypted_buffer = NULL;
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size_t buffer_length = 0;
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size_t buffer_capacity = 0;
534
ssize_t decrypted_buffer_size;
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gnutls_session_t session;
538
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int pf; /* Protocol family */
764
802
case GNUTLS_E_AGAIN:
766
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case GNUTLS_E_REHANDSHAKE:
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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");
776
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gnutls_perror(ret);
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fprintf(stderr, "Unknown error while reading data from"
783
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" encrypted session with Mandos server\n");
785
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gnutls_bye(session, GNUTLS_SHUT_RDWR);
801
gnutls_bye(session, GNUTLS_SHUT_RDWR);
842
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
847
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
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if(buffer_length > 0){
850
ssize_t decrypted_buffer_size;
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decrypted_buffer_size = pgp_packet_decrypt(buffer,
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&decrypted_buffer);
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if(decrypted_buffer_size >= 0){
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while(written < (size_t) decrypted_buffer_size){
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(size_t)decrypted_buffer_size - written,
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if(ret == 0 and ferror(stdout)){
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fprintf(stderr, "Error writing encrypted data: %s\n",
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strerror(errno));
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written += (size_t)ret;
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free(decrypted_buffer);
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/* Shutdown procedure */
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ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
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gnutls_deinit(session);
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free(decrypted_buffer);
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ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
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gnutls_deinit(session);
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errno = old_errno;
1025
* This function determines if a directory entry in /sys/class/net
1026
* corresponds to an acceptable network device.
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* (This function is passed to scandir(3) as a filter function.)
1029
int good_interface(const struct dirent *if_entry){
1031
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 = 2+(sizeof(ifreq_flags)*2)+1; /* "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 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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bool gpgme_initialized = false;
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float delay = 2.5f;
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struct sigaction old_sigterm_action;
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struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
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struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
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/* Lower any group privileges we might have, just to be safe */
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/* Lower user privileges (temporarily) */
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struct argp_option options[] = {
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{ .name = "debug", .key = 128,
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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");
1246
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'){
1072
fprintf(stderr, "Bad delay\n");
1257
argp_error(state, "Bad delay");
1261
* These reproduce what we would get without ARGP_NO_HELP
1263
case '?': /* --help */
1264
argp_state_help(state, state->out_stream,
1265
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1266
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1267
case -3: /* --usage */
1268
argp_state_help(state, state->out_stream,
1269
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1270
case 'V': /* --version */
1271
fprintf(state->out_stream, "%s\n", argp_program_version);
1272
exit(argp_err_exit_status);
1081
1275
return ARGP_ERR_UNKNOWN;
1086
1280
struct argp argp = { .options = options, .parser = parse_opt,
1087
1281
.args_doc = "",
1088
1282
.doc = "Mandos client -- Get and decrypt"
1089
1283
" passwords from a Mandos server" };
1090
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1091
if(ret == ARGP_ERR_UNKNOWN){
1092
fprintf(stderr, "Unknown error while parsing arguments\n");
1093
exitcode = EXIT_FAILURE;
1284
ret = argp_parse(&argp, argc, argv,
1285
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1292
perror("argp_parse");
1293
exitcode = EX_OSERR;
1296
exitcode = EX_USAGE;
1099
1302
avahi_set_log_function(empty_log);
1305
if(interface[0] == '\0'){
1306
struct dirent **direntries;
1307
ret = scandir(sys_class_net, &direntries, good_interface,
1310
/* Pick the first good interface */
1311
interface = strdup(direntries[0]->d_name);
1313
fprintf(stderr, "Using interface \"%s\"\n", interface);
1315
if(interface == NULL){
1318
exitcode = EXIT_FAILURE;
1324
fprintf(stderr, "Could not find a network interface\n");
1325
exitcode = EXIT_FAILURE;
1102
1330
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1103
1331
from the signal handler */
1114
1342
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1116
1344
perror("sigaddset");
1117
exitcode = EXIT_FAILURE;
1345
exitcode = EX_OSERR;
1120
1348
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1122
1350
perror("sigaddset");
1123
exitcode = EXIT_FAILURE;
1351
exitcode = EX_OSERR;
1126
1354
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1128
1356
perror("sigaddset");
1129
exitcode = EXIT_FAILURE;
1357
exitcode = EX_OSERR;
1132
1360
/* Need to check if the handler is SIG_IGN before handling:
1136
1364
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1138
1366
perror("sigaction");
1139
return EXIT_FAILURE;
1141
1369
if(old_sigterm_action.sa_handler != SIG_IGN){
1142
1370
ret = sigaction(SIGINT, &sigterm_action, NULL);
1144
1372
perror("sigaction");
1145
exitcode = EXIT_FAILURE;
1373
exitcode = EX_OSERR;
1149
1377
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1151
1379
perror("sigaction");
1152
return EXIT_FAILURE;
1154
1382
if(old_sigterm_action.sa_handler != SIG_IGN){
1155
1383
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1157
1385
perror("sigaction");
1158
exitcode = EXIT_FAILURE;
1386
exitcode = EX_OSERR;
1162
1390
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1164
1392
perror("sigaction");
1165
return EXIT_FAILURE;
1167
1395
if(old_sigterm_action.sa_handler != SIG_IGN){
1168
1396
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1170
1398
perror("sigaction");
1171
exitcode = EXIT_FAILURE;
1399
exitcode = EX_OSERR;
1176
1404
/* If the interface is down, bring it up */
1177
if(interface[0] != '\0'){
1405
if(strcmp(interface, "none") != 0){
1178
1406
if_index = (AvahiIfIndex) if_nametoindex(interface);
1179
1407
if(if_index == 0){
1180
1408
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1181
exitcode = EXIT_FAILURE;
1409
exitcode = EX_UNAVAILABLE;
1417
/* Re-raise priviliges */
1189
1424
#ifdef __linux__
1190
1425
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1191
messages to mess up the prompt */
1426
messages about the network interface to mess up the prompt */
1192
1427
ret = klogctl(8, NULL, 5);
1193
1428
bool restore_loglevel = true;
1232
1479
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1234
1481
take_down_interface = false;
1235
perror("ioctl SIOCSIFFLAGS");
1236
exitcode = EXIT_FAILURE;
1482
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1483
exitcode = EX_OSERR;
1237
1484
#ifdef __linux__
1238
1485
if(restore_loglevel){
1239
1486
ret = klogctl(7, NULL, 0);
1381
ret = start_mandos_communication(address, port, if_index, af);
1383
exitcode = EXIT_FAILURE;
1631
while(not quit_now){
1632
ret = start_mandos_communication(address, port, if_index, af);
1633
if(quit_now or ret == 0){
1385
1640
exitcode = EXIT_SUCCESS;
1473
1729
/* Take down the network interface */
1474
1730
if(take_down_interface){
1475
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1731
/* Re-raise priviliges */
1477
perror("ioctl SIOCGIFFLAGS");
1478
} else if(network.ifr_flags & IFF_UP) {
1479
network.ifr_flags &= ~IFF_UP; /* clear flag */
1480
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1482
perror("ioctl SIOCSIFFLAGS");
1485
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1738
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1740
perror("ioctl SIOCGIFFLAGS");
1741
} else if(network.ifr_flags & IFF_UP) {
1742
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1743
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1745
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1748
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1752
/* Lower privileges permanently */
1536
1806
sigemptyset(&old_sigterm_action.sa_mask);
1537
1807
old_sigterm_action.sa_handler = SIG_DFL;
1538
ret = sigaction(signal_received, &old_sigterm_action, NULL);
1808
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1809
&old_sigterm_action,
1540
1812
perror("sigaction");
1542
raise(signal_received);
1815
ret = raise(signal_received);
1816
} while(ret != 0 and errno == EINTR);
1821
TEMP_FAILURE_RETRY(pause());
1545
1824
return exitcode;