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#include <sys/socket.h> /* socket(), struct sockaddr_in6,
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inet_pton(), connect(),
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#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
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#include <fcntl.h> /* open(), unlinkat() */
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#include <dirent.h> /* opendir(), struct dirent, readdir()
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#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
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#include <errno.h> /* perror(), errno, EINTR, EINVAL,
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EAI_SYSTEM, ENETUNREACH,
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EHOSTUNREACH, ECONNREFUSED, EPROTO,
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EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
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#include <errno.h> /* perror(), errno,
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program_invocation_short_name */
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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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fprintf_plus(stderr, "GnuTLS: %s", string);
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__attribute__((nonnull(1, 2, 4), warn_unused_result))
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__attribute__((nonnull, warn_unused_result))
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static int init_gnutls_global(const char *pubkeyfilename,
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const char *seckeyfilename,
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const char *dhparamsfilename,
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fprintf_plus(stderr, "Initializing GnuTLS\n");
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ret = gnutls_global_init();
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if(ret != GNUTLS_E_SUCCESS){
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fprintf_plus(stderr, "GnuTLS global_init: %s\n",
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safer_gnutls_strerror(ret));
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/* "Use a log level over 10 to enable all debugging options."
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* - GnuTLS manual
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/* Set effective uid to 0, return errno */
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__attribute__((warn_unused_result))
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int raise_privileges(void){
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int old_errno = errno;
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error_t raise_privileges(void){
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error_t old_errno = errno;
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error_t ret_errno = 0;
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if(seteuid(0) == -1){
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errno = old_errno;
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/* Set effective and real user ID to 0. Return errno. */
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__attribute__((warn_unused_result))
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int raise_privileges_permanently(void){
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int old_errno = errno;
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int ret = raise_privileges();
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error_t raise_privileges_permanently(void){
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error_t old_errno = errno;
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error_t ret_errno = raise_privileges();
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errno = old_errno;
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if(setuid(0) == -1){
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errno = old_errno;
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/* Set effective user ID to unprivileged saved user ID */
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__attribute__((warn_unused_result))
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int lower_privileges(void){
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int old_errno = errno;
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error_t lower_privileges(void){
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error_t old_errno = errno;
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error_t ret_errno = 0;
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if(seteuid(uid) == -1){
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errno = old_errno;
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/* Lower privileges permanently */
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__attribute__((warn_unused_result))
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int lower_privileges_permanently(void){
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int old_errno = errno;
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error_t lower_privileges_permanently(void){
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error_t old_errno = errno;
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error_t ret_errno = 0;
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if(setuid(uid) == -1){
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errno = old_errno;
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/* Helper function to add_local_route() and delete_local_route() */
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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_errno = argp_parse(&argp, argc, argv,
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ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
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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_plus("argp_parse");
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exitcode = EX_OSERR;
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/* Allocate a new server */
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mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
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&config, NULL, NULL, &ret);
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&config, NULL, NULL, &ret_errno);
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/* Free the Avahi configuration data */
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avahi_server_config_free(&config);
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free(interfaces_to_take_down);
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free(interfaces_hooks);
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void clean_dir_at(int base, const char * const dirname,
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struct dirent **direntries = NULL;
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int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
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perror_plus("open");
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int numentries = scandirat(dir_fd, ".", &direntries,
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notdotentries, alphasort);
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if(numentries >= 0){
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for(int i = 0; i < numentries; i++){
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fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
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dirname, direntries[i]->d_name);
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dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
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if(errno == EISDIR){
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dret = unlinkat(dir_fd, direntries[i]->d_name,
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if((dret == -1) and (errno == ENOTEMPTY)
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and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
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== 0) and (level == 0)){
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/* Recurse only in this special case */
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clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
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fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
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direntries[i]->d_name, strerror(errno));
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free(direntries[i]);
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/* need to clean even if 0 because man page doesn't specify */
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if(numentries == -1){
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perror_plus("scandirat");
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dret = unlinkat(base, dirname, AT_REMOVEDIR);
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if(dret == -1 and errno != ENOENT){
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perror_plus("rmdir");
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perror_plus("scandirat");
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/* Removes the GPGME temp directory and all files inside */
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if(tempdir != NULL){
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clean_dir_at(-1, tempdir, 0);
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struct dirent **direntries = NULL;
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int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
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if(tempdir_fd == -1){
3045
perror_plus("open");
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int numentries = scandirat(tempdir_fd, ".", &direntries,
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notdotentries, alphasort);
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if(numentries >= 0){
3050
for(int i = 0; i < numentries; i++){
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ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
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fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
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" \"%s\", 0): %s\n", tempdir,
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direntries[i]->d_name, strerror(errno));
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free(direntries[i]);
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/* need to clean even if 0 because man page doesn't specify */
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if(numentries == -1){
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perror_plus("scandir");
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ret = rmdir(tempdir);
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if(ret == -1 and errno != ENOENT){
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perror_plus("rmdir");