tty-ask-password-agent: modernization

1 files changed, 85 insertions, 151 deletions

diff --git a/src/tty-ask-password-agent/tty-ask-password-agent.c b/src/tty-ask-password-agent/tty-ask-password-agent.c
index 528b899c08..8a02fb0b5e 100644
--- a/src/tty-ask-password-agent/tty-ask-password-agent.c
+++ b/src/tty-ask-password-agent/tty-ask-password-agent.c
@@ -41,6 +41,7 @@
 #include "ask-password-api.h"
 #include "strv.h"
 #include "build.h"
+#include "def.h"
 
 static enum {
         ACTION_LIST,
@@ -59,9 +60,9 @@ static int ask_password_plymouth(
                 bool accept_cached,
                 char ***_passphrases) {
 
-        int fd = -1, notify = -1;
-        union sockaddr_union sa = {};
-        char *packet = NULL;
+        _cleanup_close_ int fd = -1, notify = -1;
+        union sockaddr_union sa = PLYMOUTH_SOCKET;
+        _cleanup_free_ char *packet = NULL;
         ssize_t k;
         int r, n;
         struct pollfd pollfd[2] = {};
@@ -75,28 +76,23 @@ static int ask_password_plymouth(
         assert(_passphrases);
 
         if (flag_file) {
-                if ((notify = inotify_init1(IN_CLOEXEC|IN_NONBLOCK)) < 0) {
-                        r = -errno;
-                        goto finish;
-                }
+                notify = inotify_init1(IN_CLOEXEC|IN_NONBLOCK);
+                if (notify < 0)
+                        return -errno;
 
-                if (inotify_add_watch(notify, flag_file, IN_ATTRIB /* for the link count */) < 0) {
-                        r = -errno;
-                        goto finish;
-                }
+                r = inotify_add_watch(notify, flag_file, IN_ATTRIB); /* for the link count */
+                if (r < 0)
+                        return -errno;
         }
 
-        if ((fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
-                r = -errno;
-                goto finish;
-        }
+        fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
+        if (fd < 0)
+                return -errno;
 
-        sa.sa.sa_family = AF_UNIX;
-        strncpy(sa.un.sun_path+1, "/org/freedesktop/plymouthd", sizeof(sa.un.sun_path)-1);
-        if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
+        r = connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1));
+        if (r < 0) {
                 log_error("Failed to connect to Plymouth: %m");
-                r = -errno;
-                goto finish;
+                return -errno;
         }
 
         if (accept_cached) {
@@ -106,15 +102,12 @@ static int ask_password_plymouth(
                             message, &n) < 0)
                 packet = NULL;
 
-        if (!packet) {
-                r = -ENOMEM;
-                goto finish;
-        }
+        if (!packet)
+                return log_oom();
 
-        if ((k = loop_write(fd, packet, n+1, true)) != n+1) {
-                r = k < 0 ? (int) k : -EIO;
-                goto finish;
-        }
+        k = loop_write(fd, packet, n + 1, true);
+        if (k != n + 1)
+                return k < 0 ? (int) k : -EIO;
 
         pollfd[POLL_SOCKET].fd = fd;
         pollfd[POLL_SOCKET].events = POLLIN;
@@ -129,31 +122,23 @@ static int ask_password_plymouth(
 
                         y = now(CLOCK_MONOTONIC);
 
-                        if (y > until) {
-                                r = -ETIME;
-                                goto finish;
-                        }
+                        if (y > until)
+                                return -ETIME;
 
                         sleep_for = (int) ((until - y) / USEC_PER_MSEC);
                 }
 
-                if (flag_file)
-                        if (access(flag_file, F_OK) < 0) {
-                                r = -errno;
-                                goto finish;
-                        }
-
-                if ((j = poll(pollfd, notify > 0 ? 2 : 1, sleep_for)) < 0) {
+                if (flag_file && access(flag_file, F_OK) < 0)
+                        return -errno;
 
+                j = poll(pollfd, notify > 0 ? 2 : 1, sleep_for);
+                if (j < 0) {
                         if (errno == EINTR)
                                 continue;
 
-                        r = -errno;
-                        goto finish;
-                } else if (j == 0) {
-                        r = -ETIME;
-                        goto finish;
-                }
+                        return -errno;
+                } else if (j == 0)
+                        return -ETIME;
 
                 if (notify > 0 && pollfd[POLL_INOTIFY].revents != 0)
                         flush_fd(notify);
@@ -161,10 +146,9 @@ static int ask_password_plymouth(
                 if (pollfd[POLL_SOCKET].revents == 0)
                         continue;
 
-                if ((k = read(fd, buffer + p, sizeof(buffer) - p)) <= 0) {
-                        r = k < 0 ? -errno : -EIO;
-                        goto finish;
-                }
+                k = read(fd, buffer + p, sizeof(buffer) - p);
+                if (k <= 0)
+                        return r = k < 0 ? -errno : -EIO;
 
                 p += k;
 
@@ -180,15 +164,12 @@ static int ask_password_plymouth(
                                 free(packet);
                                 packet = NULL;
 
-                                if (asprintf(&packet, "*\002%c%s%n", (int) (strlen(message) + 1), message, &n) < 0) {
-                                        r = -ENOMEM;
-                                        goto finish;
-                                }
+                                if (asprintf(&packet, "*\002%c%s%n", (int) (strlen(message) + 1), message, &n) < 0)
+                                        return -ENOMEM;
 
-                                if ((k = loop_write(fd, packet, n+1, true)) != n+1) {
-                                        r = k < 0 ? (int) k : -EIO;
-                                        goto finish;
-                                }
+                                k = loop_write(fd, packet, n+1, true);
+                                if (k != n + 1)
+                                        return k < 0 ? (int) k : -EIO;
 
                                 accept_cached = false;
                                 p = 0;
@@ -196,8 +177,7 @@ static int ask_password_plymouth(
                         }
 
                         /* No password, because UI not shown */
-                        r = -ENOENT;
-                        goto finish;
+                        return -ENOENT;
 
                 } else if (buffer[0] == 2 || buffer[0] == 9) {
                         uint32_t size;
@@ -209,38 +189,25 @@ static int ask_password_plymouth(
 
                         memcpy(&size, buffer+1, sizeof(size));
                         size = le32toh(size);
-                        if (size+5 > sizeof(buffer)) {
-                                r = -EIO;
-                                goto finish;
-                        }
+                        if (size + 5 > sizeof(buffer))
+                                return -EIO;
 
                         if (p-5 < size)
                                 continue;
 
-                        if (!(l = strv_parse_nulstr(buffer + 5, size))) {
-                                r = -ENOMEM;
-                                goto finish;
-                        }
+                        l = strv_parse_nulstr(buffer + 5, size);
+                        if (!l)
+                                return -ENOMEM;
 
                         *_passphrases = l;
                         break;
 
-                } else {
+                } else
                         /* Unknown packet */
-                        r = -EIO;
-                        goto finish;
-                }
+                        return -EIO;
         }
 
-        r = 0;
-
-finish:
-        safe_close(notify);
-        safe_close(fd);
-
-        free(packet);
-
-        return r;
+        return 0;
 }
 
 static int parse_password(const char *filename, char **wall) {
@@ -255,7 +222,7 @@ static int parse_password(const char *filename, char **wall) {
                 { "Ask", "Message",      config_parse_string,   0, &message       },
                 { "Ask", "PID",          config_parse_unsigned, 0, &pid           },
                 { "Ask", "AcceptCached", config_parse_bool,     0, &accept_cached },
-                { NULL, NULL, NULL, 0, NULL }
+                {}
         };
 
         int r;
@@ -328,13 +295,12 @@ static int parse_password(const char *filename, char **wall) {
                                 if (!packet)
                                         r = -ENOMEM;
                                 else {
-                                        char *d;
-
-                                        packet[0] = '+';
-                                        d = packet+1;
+                                        char *d = packet + 1;
 
                                         STRV_FOREACH(p, passwords)
                                                 d = stpcpy(d, *p) + 1;
+
+                                        packet[0] = '+';
                                 }
                         }
 
@@ -367,7 +333,7 @@ static int parse_password(const char *filename, char **wall) {
                         }
                 }
 
-                if (r == -ETIME || r == -ENOENT)
+                if (IN_SET(r, -ETIME, -ENOENT))
                         /* If the query went away, that's OK */
                         return 0;
 
@@ -397,7 +363,7 @@ static int parse_password(const char *filename, char **wall) {
 }
 
 static int wall_tty_block(void) {
-        char *p;
+        _cleanup_free_ char *p = NULL;
         int fd, r;
         dev_t devnr;
 
@@ -412,8 +378,6 @@ static int wall_tty_block(void) {
         mkfifo(p, 0600);
 
         fd = open(p, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
-        free(p);
-
         if (fd < 0)
                 return -errno;
 
@@ -421,21 +385,15 @@ static int wall_tty_block(void) {
 }
 
 static bool wall_tty_match(const char *path) {
-        int fd, k;
-        char *p;
+        int fd, r;
         struct stat st;
+        _cleanup_free_ char *p = NULL;
 
-        if (path_is_absolute(path))
-                k = lstat(path, &st);
-        else {
-                if (asprintf(&p, "/dev/%s", path) < 0)
-                        return true;
-
-                k = lstat(p, &st);
-                free(p);
-        }
+        if (!path_is_absolute(path))
+                path = strappenda("/dev/", path);
 
-        if (k < 0)
+        r = lstat(path, &st);
+        if (r < 0)
                 return true;
 
         if (!S_ISCHR(st.st_mode))
@@ -453,8 +411,6 @@ static bool wall_tty_match(const char *path) {
                 return true;
 
         fd = open(p, O_WRONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
-        free(p);
-
         if (fd < 0)
                 return true;
 
@@ -464,11 +420,12 @@ static bool wall_tty_match(const char *path) {
 }
 
 static int show_passwords(void) {
-        DIR *d;
+        _cleanup_closedir_ DIR *d;
         struct dirent *de;
         int r = 0;
 
-        if (!(d = opendir("/run/systemd/ask-password"))) {
+        d = opendir("/run/systemd/ask-password");
+        if (!d) {
                 if (errno == ENOENT)
                         return 0;
 
@@ -477,9 +434,8 @@ static int show_passwords(void) {
         }
 
         while ((de = readdir(d))) {
-                char *p;
+                _cleanup_free_ char *p = NULL, *wall = NULL;
                 int q;
-                char *wall;
 
                 /* We only support /dev on tmpfs, hence we can rely on
                  * d_type to be reliable */
@@ -493,27 +449,18 @@ static int show_passwords(void) {
                 if (!startswith(de->d_name, "ask."))
                         continue;
 
-                if (!(p = strappend("/run/systemd/ask-password/", de->d_name))) {
-                        r = log_oom();
-                        goto finish;
-                }
+                p = strappend("/run/systemd/ask-password/", de->d_name);
+                if (!p)
+                        return log_oom();
 
-                wall = NULL;
-                if ((q = parse_password(p, &wall)) < 0)
+                q = parse_password(p, &wall);
+                if (q < 0 && r == 0)
                         r = q;
 
-                free(p);
-
-                if (wall) {
+                if (wall)
                         utmp_wall(wall, NULL, wall_tty_match);
-                        free(wall);
-                }
         }
 
-finish:
-        if (d)
-                closedir(d);
-
         return r;
 }
 
@@ -524,7 +471,7 @@ static int watch_passwords(void) {
                 _FD_MAX
         };
 
-        int notify = -1, signal_fd = -1, tty_block_fd = -1;
+        _cleanup_close_ int notify = -1, signal_fd = -1, tty_block_fd = -1;
         struct pollfd pollfd[_FD_MAX] = {};
         sigset_t mask;
         int r;
@@ -533,25 +480,20 @@ static int watch_passwords(void) {
 
         mkdir_p_label("/run/systemd/ask-password", 0755);
 
-        if ((notify = inotify_init1(IN_CLOEXEC)) < 0) {
-                r = -errno;
-                goto finish;
-        }
+        notify = inotify_init1(IN_CLOEXEC);
+        if (notify < 0)
+                return -errno;
 
-        if (inotify_add_watch(notify, "/run/systemd/ask-password", IN_CLOSE_WRITE|IN_MOVED_TO) < 0) {
-                r = -errno;
-                goto finish;
-        }
+        if (inotify_add_watch(notify, "/run/systemd/ask-password", IN_CLOSE_WRITE|IN_MOVED_TO) < 0)
+                return -errno;
 
         assert_se(sigemptyset(&mask) == 0);
         sigset_add_many(&mask, SIGINT, SIGTERM, -1);
         assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
 
-        if ((signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0) {
-                log_error("signalfd(): %m");
-                r = -errno;
-                goto finish;
-        }
+        signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
+        if (signal_fd < 0)
+                return -errno;
 
         pollfd[FD_INOTIFY].fd = notify;
         pollfd[FD_INOTIFY].events = POLLIN;
@@ -559,16 +501,15 @@ static int watch_passwords(void) {
         pollfd[FD_SIGNAL].events = POLLIN;
 
         for (;;) {
-                if ((r = show_passwords()) < 0)
+                r = show_passwords();
+                if (r < 0)
                         log_error("Failed to show password: %s", strerror(-r));
 
                 if (poll(pollfd, _FD_MAX, -1) < 0) {
-
                         if (errno == EINTR)
                                 continue;
 
-                        r = -errno;
-                        goto finish;
+                        return -errno;
                 }
 
                 if (pollfd[FD_INOTIFY].revents != 0)
@@ -578,14 +519,7 @@ static int watch_passwords(void) {
                         break;
         }
 
-        r = 0;
-
-finish:
-        safe_close(notify);
-        safe_close(signal_fd);
-        safe_close(tty_block_fd);
-
-        return r;
+        return 0;
 }
 
 static void help(void) {
@@ -692,7 +626,8 @@ int main(int argc, char *argv[]) {
 
         umask(0022);
 
-        if ((r = parse_argv(argc, argv)) <= 0)
+        r = parse_argv(argc, argv);
+        if (r <= 0)
                 goto finish;
 
         if (arg_console) {
@@ -700,8 +635,7 @@ int main(int argc, char *argv[]) {
                 release_terminal();
         }
 
-        if (arg_action == ACTION_WATCH ||
-            arg_action == ACTION_WALL)
+        if (IN_SET(arg_action, ACTION_WATCH, ACTION_WALL))
                 r = watch_passwords();
         else
                 r = show_passwords();