16280725298

Committed 14 Jul 2025 08:16PM UTC coverage: 72.166% (-0.006%) from 72.172%

Build # 16280725298

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Commit Message

Two fixlets for coverage test (#38183)

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46.95

/src/socket-activate/socket-activate.c

/* SPDX-License-Identifier: LGPL-2.1-or-later */

#include <getopt.h>
#include <sys/epoll.h>
#include <sys/wait.h>
#include <unistd.h>

#include "sd-daemon.h"

#include "alloc-util.h"
#include "build.h"
#include "daemon-util.h"
#include "env-util.h"
#include "errno-util.h"
#include "escape.h"
#include "fd-util.h"
#include "format-util.h"
#include "log.h"
#include "main-func.h"
#include "pretty-print.h"
#include "process-util.h"
#include "socket-netlink.h"
#include "socket-util.h"
#include "string-util.h"
#include "strv.h"

static char **arg_listen = NULL;
static bool arg_accept = false;
static int arg_socket_type = SOCK_STREAM;
static char **arg_setenv = NULL;
static char **arg_fdnames = NULL;
static bool arg_inetd = false;
static bool arg_now = false;

static int add_epoll(int epoll_fd, int fd) {
        struct epoll_event ev = {
                .events = EPOLLIN,
                .data.fd = fd,
        };

        assert(epoll_fd >= 0);
        assert(fd >= 0);

        if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
                return log_error_errno(errno, "Failed to add event on epoll fd:%d for fd:%d: %m", epoll_fd, fd);

        return 0;
}

static int open_sockets(int *ret_epoll_fd) {
        _cleanup_close_ int epoll_fd = -EBADF;
        int n, r, count = 0;

        assert(ret_epoll_fd);

        n = sd_listen_fds(true);
        if (n < 0)
                return log_error_errno(n, "Failed to read listening file descriptors from environment: %m");
        if (n > 0) {
                log_info("Received %i descriptors via the environment.", n);

                for (int fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) {
                        r = fd_cloexec(fd, arg_accept);
                        if (r < 0)
                                return r;

                        count++;
                }
        }

        /* Close logging and all other descriptors */
        if (arg_listen) {
                _cleanup_free_ int *except = new(int, n);
                if (!except)
                        return log_oom();

                for (int i = 0; i < n; i++)
                        except[i] = SD_LISTEN_FDS_START + i;

                log_close();
                log_set_open_when_needed(true);
                log_settle_target();

                r = close_all_fds(except, n);
                if (r < 0)
                        return log_error_errno(r, "Failed to close all file descriptors: %m");
        }

        /* Note: we leak some fd's on error here. It doesn't matter much, since the program will exit
         * immediately anyway, but would be a pain to fix. */

        STRV_FOREACH(address, arg_listen) {
                r = make_socket_fd(LOG_DEBUG, *address, arg_socket_type, (arg_accept * SOCK_CLOEXEC));
                if (r < 0)
                        return log_error_errno(r, "Failed to open '%s': %m", *address);

                assert(r == SD_LISTEN_FDS_START + count);
                count++;
        }

        if (arg_listen) {
                log_open();
                log_set_open_when_needed(false);
        }

        if (count > 1 && !arg_accept && arg_inetd)
                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
                                       "--inetd only supported with a single file descriptor, or with --accept.");

        if (arg_fdnames && !arg_inetd) {
                size_t n_fdnames = strv_length(arg_fdnames);

                if (!arg_accept && n_fdnames != (size_t) count)
                        log_warning("The number of fd names is different from the number of fds: %zu vs %i",
                                    n_fdnames, count);

                if (arg_accept && n_fdnames > 1)
                        log_warning("More than one fd name specified with --accept.");
        }

        if (!arg_now) {
                epoll_fd = epoll_create1(EPOLL_CLOEXEC);
                if (epoll_fd < 0)
                        return log_error_errno(errno, "Failed to create epoll object: %m");
        }

        for (int fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + count; fd++) {
                _cleanup_free_ char *name = NULL;

                getsockname_pretty(fd, &name);
                log_info("Listening on %s as %i.", strna(name), fd);

                if (epoll_fd >= 0) {
                        r = add_epoll(epoll_fd, fd);
                        if (r < 0)
                                return r;
                }
        }

        *ret_epoll_fd = TAKE_FD(epoll_fd);
        return count;
}

static int exec_process(char * const *argv, int start_fd, size_t n_fds) {
        _cleanup_strv_free_ char **envp = NULL;
        int r;

        assert(!strv_isempty(argv));
        assert(start_fd >= 0);
        assert(n_fds > 0);

        FOREACH_STRING(var, "TERM", "COLORTERM", "NO_COLOR", "PATH", "USER", "HOME") {
                const char *n;

                n = strv_find_prefix(environ, var);
                if (!n)
                        continue;

                r = strv_extend(&envp, n);
                if (r < 0)
                        return r;
        }

        if (arg_inetd) {
                assert(n_fds == 1);

                r = rearrange_stdio(start_fd, start_fd, STDERR_FILENO); /* invalidates start_fd on success + error */
                if (r < 0)
                        return log_error_errno(r, "Failed to move fd to stdin+stdout: %m");

        } else {
                if (start_fd != SD_LISTEN_FDS_START) {
                        assert(n_fds == 1);

                        if (dup2(start_fd, SD_LISTEN_FDS_START) < 0)
                                return log_error_errno(errno, "Failed to dup connection: %m");

                        safe_close(start_fd);
                }

                r = strv_extendf(&envp, "LISTEN_FDS=%zu", n_fds);
                if (r < 0)
                        return r;

                r = strv_extendf(&envp, "LISTEN_PID=" PID_FMT, getpid_cached());
                if (r < 0)
                        return r;

                if (arg_fdnames) {
                        _cleanup_free_ char *names = NULL;
                        size_t len;

                        len = strv_length(arg_fdnames);
                        if (len == 1)
                                for (size_t i = 1; i < n_fds; i++) {
                                        r = strv_extend(&arg_fdnames, arg_fdnames[0]);
                                        if (r < 0)
                                                return log_oom();
                                }

                        names = strv_join(arg_fdnames, ":");
                        if (!names)
                                return log_oom();

                        char *t = strjoin("LISTEN_FDNAMES=", names);
                        if (!t)
                                return log_oom();

                        r = strv_consume(&envp, t);
                        if (r < 0)
                                return r;
                }
        }

        STRV_FOREACH(s, arg_setenv) {
                r = strv_env_replace_strdup(&envp, *s);
                if (r < 0)
                        return r;
        }

        _cleanup_free_ char *joined = strv_join(argv, " ");
        if (!joined)
                return log_oom();

        log_info("Executing: %s", joined);
        execvpe(argv[0], argv, envp);

        return log_error_errno(errno, "Failed to execute '%s': %m", joined);
}

static int fork_and_exec_process(char * const *argv, int fd) {
        _cleanup_free_ char *joined = NULL;
        pid_t child_pid;
        int r;

        assert(!strv_isempty(argv));
        assert(fd >= 0);

        joined = strv_join(argv, " ");
        if (!joined)
                return log_oom();

        r = safe_fork("(activate)",
                      FORK_RESET_SIGNALS | FORK_DEATHSIG_SIGTERM | FORK_RLIMIT_NOFILE_SAFE | FORK_LOG,
                      &child_pid);
        if (r < 0)
                return r;
        if (r == 0) {
                /* In the child */
                (void) exec_process(argv, fd, 1);
                _exit(EXIT_FAILURE);
        }

        log_info("Spawned '%s' as PID " PID_FMT ".", joined, child_pid);
        return 0;
}

static int do_accept(char * const *argv, int fd) {
        _cleanup_free_ char *local = NULL, *peer = NULL;
        _cleanup_close_ int fd_accepted = -EBADF;

        fd_accepted = accept4(fd, NULL, NULL, 0);
        if (fd_accepted < 0) {
                if (ERRNO_IS_ACCEPT_AGAIN(errno))
                        return 0;

                return log_error_errno(errno, "Failed to accept connection on fd:%d: %m", fd);
        }

        (void) getsockname_pretty(fd_accepted, &local);
        (void) getpeername_pretty(fd_accepted, true, &peer);
        log_info("Connection from %s to %s", strna(peer), strna(local));

        return fork_and_exec_process(argv, fd_accepted);
}

/* SIGCHLD handler. */
static void sigchld_hdl(int sig) {
        int r;

        PROTECT_ERRNO;

        for (;;) {
                siginfo_t si = {};

                r = waitid(P_ALL, 0, &si, WEXITED | WNOHANG);
                if (r < 0) {
                        if (errno != ECHILD)
                                log_error_errno(errno, "Failed to reap children: %m");
                        return;
                }
                if (si.si_pid == 0)
                        return;

                log_info("Child %d died with code %d", si.si_pid, si.si_status);
        }
}

static int install_chld_handler(void) {
        static const struct sigaction act = {
                .sa_flags = SA_NOCLDSTOP | SA_RESTART,
                .sa_handler = sigchld_hdl,
        };

        if (sigaction(SIGCHLD, &act, NULL) < 0)
                return log_error_errno(errno, "Failed to install SIGCHLD handler: %m");

        return 0;
}

static int help(void) {
        _cleanup_free_ char *link = NULL;
        int r;

        r = terminal_urlify_man("systemd-socket-activate", "1", &link);
        if (r < 0)
                return log_oom();

        printf("%s [OPTIONS...] COMMAND ...\n"
               "\n%sListen on sockets and launch child on connection.%s\n"
               "\nOptions:\n"
               "  -h --help                  Show this help and exit\n"
               "     --version               Print version string and exit\n"
               "  -l --listen=ADDR           Listen for raw connections at ADDR\n"
               "  -d --datagram              Listen on datagram instead of stream socket\n"
               "     --seqpacket             Listen on SOCK_SEQPACKET instead of stream socket\n"
               "  -a --accept                Spawn separate child for each connection\n"
               "  -E --setenv=NAME[=VALUE]   Pass an environment variable to children\n"
               "     --fdname=NAME[:NAME...] Specify names for file descriptors\n"
               "     --inetd                 Enable inetd file descriptor passing protocol\n"
               "     --now                   Start instantly instead of waiting for connection\n"
               "\nNote: file descriptors from sd_listen_fds() will be passed through.\n"
               "\nSee the %s for details.\n",
               program_invocation_short_name,
               ansi_highlight(),
               ansi_normal(),
               link);

        return 0;
}

static int parse_argv(int argc, char *argv[]) {
        enum {
                ARG_VERSION = 0x100,
                ARG_FDNAME,
                ARG_SEQPACKET,
                ARG_INETD,
                ARG_NOW,
        };

        static const struct option options[] = {
                { "help",        no_argument,       NULL, 'h'           },
                { "version",     no_argument,       NULL, ARG_VERSION   },
                { "datagram",    no_argument,       NULL, 'd'           },
                { "seqpacket",   no_argument,       NULL, ARG_SEQPACKET },
                { "listen",      required_argument, NULL, 'l'           },
                { "accept",      no_argument,       NULL, 'a'           },
                { "setenv",      required_argument, NULL, 'E'           },
                { "environment", required_argument, NULL, 'E'           }, /* legacy alias */
                { "fdname",      required_argument, NULL, ARG_FDNAME    },
                { "inetd",       no_argument,       NULL, ARG_INETD     },
                { "now",         no_argument,       NULL, ARG_NOW       },
                {}
        };

        int c, r;

        assert(argc >= 0);
        assert(argv);

        /* Resetting to 0 forces the invocation of an internal initialization routine of getopt_long()
         * that checks for GNU extensions in optstring ('-' or '+' at the beginning). */
        optind = 0;
        while ((c = getopt_long(argc, argv, "+hl:aE:d", options, NULL)) >= 0)
                switch (c) {
                case 'h':
                        return help();

                case ARG_VERSION:
                        return version();

                case 'l':
                        r = strv_extend(&arg_listen, optarg);
                        if (r < 0)
                                return log_oom();

                        break;

                case 'd':
                        if (arg_socket_type == SOCK_SEQPACKET)
                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
                                                       "--datagram may not be combined with --seqpacket.");

                        arg_socket_type = SOCK_DGRAM;
                        break;

                case ARG_SEQPACKET:
                        if (arg_socket_type == SOCK_DGRAM)
                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
                                                       "--seqpacket may not be combined with --datagram.");

                        arg_socket_type = SOCK_SEQPACKET;
                        break;

                case 'a':
                        arg_accept = true;
                        break;

                case 'E':
                        r = strv_env_replace_strdup_passthrough(&arg_setenv, optarg);
                        if (r < 0)
                                return log_error_errno(r, "Cannot assign environment variable %s: %m", optarg);
                        break;

                case ARG_FDNAME: {
                        _cleanup_strv_free_ char **names = NULL;

                        names = strv_split(optarg, ":");
                        if (!names)
                                return log_oom();

                        STRV_FOREACH(s, names)
                                if (!fdname_is_valid(*s)) {
                                        _cleanup_free_ char *esc = NULL;

                                        esc = cescape(*s);
                                        log_warning("File descriptor name \"%s\" is not valid.", esc);
                                }

                        /* Empty optargs means one empty name */
                        r = strv_extend_strv(&arg_fdnames,
                                             strv_isempty(names) ? STRV_MAKE("") : names,
                                             false);
                        if (r < 0)
                                return log_error_errno(r, "strv_extend_strv: %m");
                        break;
                }

                case ARG_INETD:
                        arg_inetd = true;
                        break;

                case ARG_NOW:
                        arg_now = true;
                        break;

                case '?':
                        return -EINVAL;

                default:
                        assert_not_reached();
                }

        if (optind == argc)
                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
                                       "%s: command to execute is missing.",
                                       program_invocation_short_name);

        if (arg_socket_type == SOCK_DGRAM && arg_accept)
                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
                                       "Datagram sockets do not accept connections. "
                                       "The --datagram and --accept options may not be combined.");

        if (arg_accept && arg_now)
                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
                                       "--now cannot be used in conjunction with --accept.");

        if (arg_fdnames && arg_inetd)
                log_warning("--fdname= has no effect with --inetd present.");

        return 1 /* work to do */;
}

static int run(int argc, char **argv) {
        _cleanup_close_ int epoll_fd = -EBADF;
        _cleanup_strv_free_ char **exec_argv = NULL;
        int r, n;

        log_setup();

        r = parse_argv(argc, argv);
        if (r <= 0)
                return r;

        exec_argv = strv_copy(argv + optind);
        if (!exec_argv)
                return log_oom();

        assert(!strv_isempty(exec_argv));

        n = open_sockets(&epoll_fd);
        if (n < 0)
                return n;
        if (n == 0)
                return log_error_errno(SYNTHETIC_ERRNO(ENOENT), "No sockets to listen on specified or passed in.");

        if (arg_accept) {
                r = install_chld_handler();
                if (r < 0)
                        return r;
        }

        /* Notify the caller that all sockets are open now. */
        _unused_ _cleanup_(notify_on_cleanup) const char *notify = notify_start(NOTIFY_READY_MESSAGE, NOTIFY_STOPPING_MESSAGE);

        for (;;) {
                struct epoll_event event;

                if (epoll_fd >= 0) {
                        if (epoll_wait(epoll_fd, &event, 1, -1) < 0) {
                                if (errno == EINTR)
                                        continue;

                                return log_error_errno(errno, "epoll_wait() failed: %m");
                        }

                        log_info("Communication attempt on fd %i.", event.data.fd);
                }

                if (!arg_accept)
                        return exec_process(exec_argv, SD_LISTEN_FDS_START, (size_t) n);

                r = do_accept(exec_argv, event.data.fd);
                if (r < 0)
                        return r;
        }
}

DEFINE_MAIN_FUNCTION(run);

1	/* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3	#include <getopt.h>
4	#include <sys/epoll.h>
5	#include <sys/wait.h>
6	#include <unistd.h>
7
8	#include "sd-daemon.h"
9
10	#include "alloc-util.h"
11	#include "build.h"
12	#include "daemon-util.h"
13	#include "env-util.h"
14	#include "errno-util.h"
15	#include "escape.h"
16	#include "fd-util.h"
17	#include "format-util.h"
18	#include "log.h"
19	#include "main-func.h"
20	#include "pretty-print.h"
21	#include "process-util.h"
22	#include "socket-netlink.h"
23	#include "socket-util.h"
24	#include "string-util.h"
25	#include "strv.h"
26
27	static char **arg_listen = NULL;
28	static bool arg_accept = false;
29	static int arg_socket_type = SOCK_STREAM;
30	static char **arg_setenv = NULL;
31	static char **arg_fdnames = NULL;
32	static bool arg_inetd = false;
33	static bool arg_now = false;
34
35	static int add_epoll(int epoll_fd, int fd) {	1✔
36	struct epoll_event ev = {	1✔
37	.events = EPOLLIN,
38	.data.fd = fd,
39	};
40
41	assert(epoll_fd >= 0);	1✔
42	assert(fd >= 0);	1✔
43
44	if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)	1✔
45	return log_error_errno(errno, "Failed to add event on epoll fd:%d for fd:%d: %m", epoll_fd, fd);	×
46
47	return 0;
48	}
49
50	static int open_sockets(int *ret_epoll_fd) {	4✔
51	_cleanup_close_ int epoll_fd = -EBADF;	4✔
52	int n, r, count = 0;	4✔
53
54	assert(ret_epoll_fd);	4✔
55
56	n = sd_listen_fds(true);	4✔
57	if (n < 0)	4✔
58	return log_error_errno(n, "Failed to read listening file descriptors from environment: %m");	×
59	if (n > 0) {	4✔
60	log_info("Received %i descriptors via the environment.", n);	×
61
62	for (int fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) {	×
63	r = fd_cloexec(fd, arg_accept);	×
64	if (r < 0)	×
65	return r;
66
67	count++;	×
68	}
69	}
70
71	/* Close logging and all other descriptors */
72	if (arg_listen) {	4✔
73	_cleanup_free_ int *except = new(int, n);	8✔
74	if (!except)	4✔
75	return log_oom();	×
76
77	for (int i = 0; i < n; i++)	4✔
78	except[i] = SD_LISTEN_FDS_START + i;	×
79
80	log_close();	4✔
81	log_set_open_when_needed(true);	4✔
82	log_settle_target();	4✔
83
84	r = close_all_fds(except, n);	4✔
85	if (r < 0)	4✔
86	return log_error_errno(r, "Failed to close all file descriptors: %m");	×
87	}
88
89	/* Note: we leak some fd's on error here. It doesn't matter much, since the program will exit
90	* immediately anyway, but would be a pain to fix. */
91
92	STRV_FOREACH(address, arg_listen) {	9✔
93	r = make_socket_fd(LOG_DEBUG, address, arg_socket_type, (arg_accept SOCK_CLOEXEC));	5✔
94	if (r < 0)	5✔
95	return log_error_errno(r, "Failed to open '%s': %m", *address);	×
96
97	assert(r == SD_LISTEN_FDS_START + count);	5✔
98	count++;	5✔
99	}
100
101	if (arg_listen) {	4✔
102	log_open();	4✔
103	log_set_open_when_needed(false);	4✔
104	}
105
106	if (count > 1 && !arg_accept && arg_inetd)	4✔
107	return log_error_errno(SYNTHETIC_ERRNO(EINVAL),	1✔
108	"--inetd only supported with a single file descriptor, or with --accept.");
109
110	if (arg_fdnames && !arg_inetd) {	3✔
111	size_t n_fdnames = strv_length(arg_fdnames);	×
112
113	if (!arg_accept && n_fdnames != (size_t) count)	×
114	log_warning("The number of fd names is different from the number of fds: %zu vs %i",	×
115	n_fdnames, count);
116
117	if (arg_accept && n_fdnames > 1)	×
118	log_warning("More than one fd name specified with --accept.");	×
119	}
120
121	if (!arg_now) {	3✔
122	epoll_fd = epoll_create1(EPOLL_CLOEXEC);	1✔
123	if (epoll_fd < 0)	1✔
124	return log_error_errno(errno, "Failed to create epoll object: %m");	×
125	}
126
127	for (int fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + count; fd++) {	6✔
128	_cleanup_free_ char *name = NULL;	3✔
129
130	getsockname_pretty(fd, &name);	3✔
131	log_info("Listening on %s as %i.", strna(name), fd);	3✔
132
133	if (epoll_fd >= 0) {	3✔
134	r = add_epoll(epoll_fd, fd);	1✔
135	if (r < 0)	1✔
136	return r;	×
137	}
138	}
139
140	*ret_epoll_fd = TAKE_FD(epoll_fd);	3✔
141	return count;	3✔
142	}
143
144	static int exec_process(char * const *argv, int start_fd, size_t n_fds) {	4✔
145	_cleanup_strv_free_ char **envp = NULL;	×
146	int r;	4✔
147
148	assert(!strv_isempty(argv));	4✔
149	assert(start_fd >= 0);	4✔
150	assert(n_fds > 0);	4✔
151
152	FOREACH_STRING(var, "TERM", "COLORTERM", "NO_COLOR", "PATH", "USER", "HOME") {	28✔
153	const char *n;	24✔
154
155	n = strv_find_prefix(environ, var);	24✔
156	if (!n)	24✔
157	continue;	12✔
158
159	r = strv_extend(&envp, n);	12✔
160	if (r < 0)	12✔
161	return r;	×
162	}
163
164	if (arg_inetd) {	4✔
165	assert(n_fds == 1);	1✔
166
167	r = rearrange_stdio(start_fd, start_fd, STDERR_FILENO); /* invalidates start_fd on success + error */	1✔
168	if (r < 0)	1✔
169	return log_error_errno(r, "Failed to move fd to stdin+stdout: %m");	×
170
171	} else {
172	if (start_fd != SD_LISTEN_FDS_START) {	3✔
173	assert(n_fds == 1);	×
174
175	if (dup2(start_fd, SD_LISTEN_FDS_START) < 0)	×
176	return log_error_errno(errno, "Failed to dup connection: %m");	×
177
178	safe_close(start_fd);	×
179	}
180
181	r = strv_extendf(&envp, "LISTEN_FDS=%zu", n_fds);	3✔
182	if (r < 0)	3✔
183	return r;
184
185	r = strv_extendf(&envp, "LISTEN_PID=" PID_FMT, getpid_cached());	3✔
186	if (r < 0)	3✔
187	return r;
188
189	if (arg_fdnames) {	3✔
190	_cleanup_free_ char *names = NULL;	×
191	size_t len;	×
192
193	len = strv_length(arg_fdnames);	×
194	if (len == 1)	×
195	for (size_t i = 1; i < n_fds; i++) {	×
196	r = strv_extend(&arg_fdnames, arg_fdnames[0]);	×
197	if (r < 0)	×
198	return log_oom();	×
199	}
200
201	names = strv_join(arg_fdnames, ":");	×
202	if (!names)	×
203	return log_oom();	×
204
205	char *t = strjoin("LISTEN_FDNAMES=", names);	×
206	if (!t)	×
207	return log_oom();	×
208
209	r = strv_consume(&envp, t);	×
210	if (r < 0)	×
211	return r;
212	}
213	}
214
215	STRV_FOREACH(s, arg_setenv) {	4✔
216	r = strv_env_replace_strdup(&envp, *s);	×
217	if (r < 0)	×
218	return r;
219	}
220
221	_cleanup_free_ char *joined = strv_join(argv, " ");	4✔
222	if (!joined)	4✔
223	return log_oom();	×
224
225	log_info("Executing: %s", joined);	4✔
226	execvpe(argv[0], argv, envp);	4✔
227
228	return log_error_errno(errno, "Failed to execute '%s': %m", joined);	×
229	}
230
231	static int fork_and_exec_process(char * const *argv, int fd) {	×
232	_cleanup_free_ char *joined = NULL;	×
233	pid_t child_pid;	×
234	int r;	×
235
236	assert(!strv_isempty(argv));	×
237	assert(fd >= 0);	×
238
239	joined = strv_join(argv, " ");	×
240	if (!joined)	×
241	return log_oom();	×
242
243	r = safe_fork("(activate)",	×
244	FORK_RESET_SIGNALS \| FORK_DEATHSIG_SIGTERM \| FORK_RLIMIT_NOFILE_SAFE \| FORK_LOG,
245	&child_pid);
246	if (r < 0)	1✔
247	return r;
248	if (r == 0) {	1✔
249	/* In the child */
250	(void) exec_process(argv, fd, 1);	1✔
251	_exit(EXIT_FAILURE);	×
252	}
253
254	log_info("Spawned '%s' as PID " PID_FMT ".", joined, child_pid);	×
255	return 0;
256	}
257
258	static int do_accept(char * const *argv, int fd) {	×
259	_cleanup_free_ char local = NULL, peer = NULL;	×
260	_cleanup_close_ int fd_accepted = -EBADF;	×
261
262	fd_accepted = accept4(fd, NULL, NULL, 0);	×
263	if (fd_accepted < 0) {	×
264	if (ERRNO_IS_ACCEPT_AGAIN(errno))	×
265	return 0;
266
267	return log_error_errno(errno, "Failed to accept connection on fd:%d: %m", fd);	×
268	}
269
270	(void) getsockname_pretty(fd_accepted, &local);	×
271	(void) getpeername_pretty(fd_accepted, true, &peer);	×
272	log_info("Connection from %s to %s", strna(peer), strna(local));	×
273
274	return fork_and_exec_process(argv, fd_accepted);	×
275	}
276
277	/* SIGCHLD handler. */
278	static void sigchld_hdl(int sig) {	×
279	int r;	×
280
281	PROTECT_ERRNO;	×
282
283	for (;;) {	×
284	siginfo_t si = {};	×
285
286	r = waitid(P_ALL, 0, &si, WEXITED \| WNOHANG);	×
287	if (r < 0) {	×
288	if (errno != ECHILD)	×
289	log_error_errno(errno, "Failed to reap children: %m");	×
290	return;	×
291	}
292	if (si.si_pid == 0)	×
293	return;
294
295	log_info("Child %d died with code %d", si.si_pid, si.si_status);	×
296	}
297	}
298
299	static int install_chld_handler(void) {	×
300	static const struct sigaction act = {	×
301	.sa_flags = SA_NOCLDSTOP \| SA_RESTART,
302	.sa_handler = sigchld_hdl,
303	};
304
305	if (sigaction(SIGCHLD, &act, NULL) < 0)	×
306	return log_error_errno(errno, "Failed to install SIGCHLD handler: %m");	×
307
308	return 0;
309	}
310
311	static int help(void) {	×
312	_cleanup_free_ char *link = NULL;	×
313	int r;	×
314
315	r = terminal_urlify_man("systemd-socket-activate", "1", &link);	×
316	if (r < 0)	×
317	return log_oom();	×
318
319	printf("%s [OPTIONS...] COMMAND ...\n"	×
320	"\n%sListen on sockets and launch child on connection.%s\n"
321	"\nOptions:\n"
322	" -h --help Show this help and exit\n"
323	" --version Print version string and exit\n"
324	" -l --listen=ADDR Listen for raw connections at ADDR\n"
325	" -d --datagram Listen on datagram instead of stream socket\n"
326	" --seqpacket Listen on SOCK_SEQPACKET instead of stream socket\n"
327	" -a --accept Spawn separate child for each connection\n"
328	" -E --setenv=NAME[=VALUE] Pass an environment variable to children\n"
329	" --fdname=NAME[:NAME...] Specify names for file descriptors\n"
330	" --inetd Enable inetd file descriptor passing protocol\n"
331	" --now Start instantly instead of waiting for connection\n"
332	"\nNote: file descriptors from sd_listen_fds() will be passed through.\n"
333	"\nSee the %s for details.\n",
334	program_invocation_short_name,
335	ansi_highlight(),
336	ansi_normal(),
337	link);
338
339	return 0;
340	}
341
342	static int parse_argv(int argc, char *argv[]) {	5✔
343	enum {	5✔
344	ARG_VERSION = 0x100,
345	ARG_FDNAME,
346	ARG_SEQPACKET,
347	ARG_INETD,
348	ARG_NOW,
349	};
350
351	static const struct option options[] = {	5✔
352	{ "help", no_argument, NULL, 'h' },
353	{ "version", no_argument, NULL, ARG_VERSION },
354	{ "datagram", no_argument, NULL, 'd' },
355	{ "seqpacket", no_argument, NULL, ARG_SEQPACKET },
356	{ "listen", required_argument, NULL, 'l' },
357	{ "accept", no_argument, NULL, 'a' },
358	{ "setenv", required_argument, NULL, 'E' },
359	{ "environment", required_argument, NULL, 'E' }, /* legacy alias */
360	{ "fdname", required_argument, NULL, ARG_FDNAME },
361	{ "inetd", no_argument, NULL, ARG_INETD },
362	{ "now", no_argument, NULL, ARG_NOW },
363	{}
364	};
365
366	int c, r;	5✔
367
368	assert(argc >= 0);	5✔
369	assert(argv);	5✔
370
371	/* Resetting to 0 forces the invocation of an internal initialization routine of getopt_long()
372	* that checks for GNU extensions in optstring ('-' or '+' at the beginning). */
373	optind = 0;	5✔
374	while ((c = getopt_long(argc, argv, "+hl:aE:d", options, NULL)) >= 0)	16✔
375	switch (c) {	11✔
376	case 'h':	×
377	return help();	×
378
379	case ARG_VERSION:	×
380	return version();	×
381
382	case 'l':	6✔
383	r = strv_extend(&arg_listen, optarg);	6✔
384	if (r < 0)	6✔
385	return log_oom();	×
386
387	break;
388
389	case 'd':	×
390	if (arg_socket_type == SOCK_SEQPACKET)	×
391	return log_error_errno(SYNTHETIC_ERRNO(EINVAL),	×
392	"--datagram may not be combined with --seqpacket.");
393
394	arg_socket_type = SOCK_DGRAM;	×
395	break;	×
396
397	case ARG_SEQPACKET:	×
398	if (arg_socket_type == SOCK_DGRAM)	×
399	return log_error_errno(SYNTHETIC_ERRNO(EINVAL),	×
400	"--seqpacket may not be combined with --datagram.");
401
402	arg_socket_type = SOCK_SEQPACKET;	×
403	break;	×
404
405	case 'a':	1✔
406	arg_accept = true;	1✔
407	break;	1✔
408
409	case 'E':	×
410	r = strv_env_replace_strdup_passthrough(&arg_setenv, optarg);	×
411	if (r < 0)	×
412	return log_error_errno(r, "Cannot assign environment variable %s: %m", optarg);	×
413	break;
414
415	case ARG_FDNAME: {	×
416	_cleanup_strv_free_ char **names = NULL;	×
417
418	names = strv_split(optarg, ":");	×
419	if (!names)	×
420	return log_oom();	×
421
422	STRV_FOREACH(s, names)	×
423	if (!fdname_is_valid(*s)) {	×
424	_cleanup_free_ char *esc = NULL;	×
425
426	esc = cescape(*s);	×
427	log_warning("File descriptor name \"%s\" is not valid.", esc);	×
428	}
429
430	/* Empty optargs means one empty name */
431	r = strv_extend_strv(&arg_fdnames,	×
432	strv_isempty(names) ? STRV_MAKE("") : names,	×
433	false);
434	if (r < 0)	×
435	return log_error_errno(r, "strv_extend_strv: %m");	×
436	break;	×
437	}
438
439	case ARG_INETD:	1✔
440	arg_inetd = true;	1✔
441	break;	1✔
442
443	case ARG_NOW:	3✔
444	arg_now = true;	3✔
445	break;	3✔
446
447	case '?':
448	return -EINVAL;
449
450	default:	×
451	assert_not_reached();	×
452	}
453
454	if (optind == argc)	5✔
455	return log_error_errno(SYNTHETIC_ERRNO(EINVAL),	×
456	"%s: command to execute is missing.",
457	program_invocation_short_name);
458
459	if (arg_socket_type == SOCK_DGRAM && arg_accept)	5✔
460	return log_error_errno(SYNTHETIC_ERRNO(EINVAL),	×
461	"Datagram sockets do not accept connections. "
462	"The --datagram and --accept options may not be combined.");
463
464	if (arg_accept && arg_now)	5✔
465	return log_error_errno(SYNTHETIC_ERRNO(EINVAL),	1✔
466	"--now cannot be used in conjunction with --accept.");
467
468	if (arg_fdnames && arg_inetd)	4✔
469	log_warning("--fdname= has no effect with --inetd present.");	×
470
471	return 1 /* work to do */;
472	}
473
474	static int run(int argc, char **argv) {	5✔
475	_cleanup_close_ int epoll_fd = -EBADF;	2✔
476	_cleanup_strv_free_ char **exec_argv = NULL;	2✔
477	int r, n;	5✔
478
479	log_setup();	5✔
480
481	r = parse_argv(argc, argv);	5✔
482	if (r <= 0)	5✔
483	return r;
484
485	exec_argv = strv_copy(argv + optind);	4✔
486	if (!exec_argv)	4✔
487	return log_oom();	×
488
489	assert(!strv_isempty(exec_argv));	4✔
490
491	n = open_sockets(&epoll_fd);	4✔
492	if (n < 0)	4✔
493	return n;
494	if (n == 0)	3✔
495	return log_error_errno(SYNTHETIC_ERRNO(ENOENT), "No sockets to listen on specified or passed in.");	×
496
497	if (arg_accept) {	3✔
498	r = install_chld_handler();	×
499	if (r < 0)	×
500	return r;
501	}
502
503	/* Notify the caller that all sockets are open now. */
504	_unused_ _cleanup_(notify_on_cleanup) const char *notify = notify_start(NOTIFY_READY_MESSAGE, NOTIFY_STOPPING_MESSAGE);	3✔
505
506	for (;;) {	3✔
507	struct epoll_event event;	3✔
508
509	if (epoll_fd >= 0) {	3✔
510	if (epoll_wait(epoll_fd, &event, 1, -1) < 0) {	1✔
511	if (errno == EINTR)	×
512	continue;	×
513
514	return log_error_errno(errno, "epoll_wait() failed: %m");	×
515	}
516
517	log_info("Communication attempt on fd %i.", event.data.fd);	1✔
518	}
519
520	if (!arg_accept)	3✔
521	return exec_process(exec_argv, SD_LISTEN_FDS_START, (size_t) n);	3✔
522
523	r = do_accept(exec_argv, event.data.fd);	×
524	if (r < 0)	×
525	return r;
526	}
527	}
528
529	DEFINE_MAIN_FUNCTION(run);	5✔

systemd / systemd / 16280725298

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