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#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
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#include <stdio.h> /* fprintf(), stderr, fwrite(),
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stdout, ferror(), remove() */
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#include <stdint.h> /* uint16_t, uint32_t, intptr_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 <sys/socket.h> /* socket(), struct sockaddr_in6,
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inet_pton(), connect(),
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#include <fcntl.h> /* open(), unlinkat() */
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#include <fcntl.h> /* open() */
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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 <unistd.h> /* close(), SEEK_SET, off_t, write(),
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getuid(), getgid(), seteuid(),
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setgid(), pause(), _exit(),
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setgid(), pause(), _exit() */
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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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if(new_server->ip == NULL){
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perror_plus("strdup");
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ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
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perror_plus("clock_gettime");
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wcast-qual"
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free((char *)(new_server->ip));
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#pragma GCC diagnostic pop
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/* Special case of first server */
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ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
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char *fullname = NULL;
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ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
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perror_plus("asprintf");
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ret = stat(fullname, &st);
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perror_plus("Could not stat hook");
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if(not (S_ISREG(st.st_mode))){
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/* Not a regular file */
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error_t ret_errno = 0;
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if(setuid(uid) == -1){
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ret_errno = errno;
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perror_plus("setuid");
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errno = old_errno;
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return ret_errno;
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* Based on the example in the GNU LibC manual chapter 13.13 "File
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* Descriptor Flags".
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| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
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__attribute__((warn_unused_result))
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static int set_cloexec_flag(int fd){
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int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
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/* If reading the flags failed, return error indication now. */
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/* Store modified flag word in the descriptor. */
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return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
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#endif /* not O_CLOEXEC */
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__attribute__((nonnull))
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void run_network_hooks(const char *mode, const char *interface,
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1538
const float delay){
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struct dirent **direntries = NULL;
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struct dirent **direntries;
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if(hookdir_fd == -1){
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hookdir_fd = open(hookdir, O_RDONLY);
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hookdir_fd = open(hookdir, O_RDONLY |
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#else /* not O_CLOEXEC */
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#endif /* not O_CLOEXEC */
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if(hookdir_fd == -1){
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if(errno == ENOENT){
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if(set_cloexec_flag(hookdir_fd) < 0){
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perror_plus("set_cloexec_flag");
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if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
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perror_plus("close");
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#endif /* not O_CLOEXEC */
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#ifdef __GLIBC__
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#if __GLIBC_PREREQ(2, 15)
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_exit(EX_OSERR);
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int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
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perror_plus("openat");
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_exit(EXIT_FAILURE);
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if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
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perror_plus("close");
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_exit(EXIT_FAILURE);
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if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
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if(fexecve(hookdir_fd, (char *const [])
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{ direntry->d_name, NULL }, environ) == -1){
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perror_plus("fexecve");
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_exit(EXIT_FAILURE);
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fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
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" with status %d\n", direntry->d_name,
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WEXITSTATUS(status));
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} else if(WIFSIGNALED(status)){
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fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
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" signal %d\n", direntry->d_name,
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WTERMSIG(status));
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fprintf_plus(stderr, "Warning: network hook \"%s\""
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" crashed\n", direntry->d_name);
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/* If no interfaces were specified, make a list */
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if(mc.interfaces == NULL){
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struct dirent **direntries = NULL;
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struct dirent **direntries;
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/* Look for any good interfaces */
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ret = scandir(sys_class_net, &direntries, good_interface,
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mc.current_server->prev->next = NULL;
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while(mc.current_server != NULL){
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server *next = mc.current_server->next;
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wcast-qual"
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free((char *)(mc.current_server->ip));
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#pragma GCC diagnostic pop
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free(mc.current_server);
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mc.current_server = next;
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/* Removes the GPGME temp directory and all files inside */
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if(tempdir != NULL){
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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){
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perror_plus("open");
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#if __GLIBC_PREREQ(2, 15)
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int numentries = scandirat(tempdir_fd, ".", &direntries,
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notdotentries, alphasort);
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#else /* not __GLIBC_PREREQ(2, 15) */
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int numentries = scandir(tempdir, &direntries, notdotentries,
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#endif /* not __GLIBC_PREREQ(2, 15) */
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#else /* not __GLIBC__ */
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int numentries = scandir(tempdir, &direntries, notdotentries,
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#endif /* not __GLIBC__ */
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if(numentries >= 0){
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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");
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struct dirent *direntry = NULL;
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int numentries = scandir(tempdir, &direntries, notdotentries,
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for(int i = 0; i < numentries; 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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perror_plus("asprintf");
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ret = remove(fullname);
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fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
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TEMP_FAILURE_RETRY(close(tempdir_fd));
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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");