~kennylevinsen/seatd

ref: 3ad9164a896eacffd27588f5b1fd6ea3e0bcd92d seatd/seatd/seatd.c -rw-r--r-- 4.3 KiB
3ad9164aKenny Levinsen Bump version to 0.6.0 4 months ago
                                                                                
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
#include <errno.h>
#include <grp.h>
#include <poll.h>
#include <pwd.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/un.h>

#include "client.h"
#include "log.h"
#include "poller.h"
#include "server.h"

#define LISTEN_BACKLOG 16

static int open_socket(const char *path, int uid, int gid) {
	union {
		struct sockaddr_un unix;
		struct sockaddr generic;
	} addr = {{0}};
	int fd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0);
	if (fd == -1) {
		log_errorf("Could not create socket: %s", strerror(errno));
		return -1;
	}

	addr.unix.sun_family = AF_UNIX;
	strncpy(addr.unix.sun_path, path, sizeof addr.unix.sun_path - 1);
	socklen_t size = offsetof(struct sockaddr_un, sun_path) + strlen(addr.unix.sun_path);
	if (bind(fd, &addr.generic, size) == -1) {
		log_errorf("Could not bind socket: %s", strerror(errno));
		goto error;
	}
	if (listen(fd, LISTEN_BACKLOG) == -1) {
		log_errorf("Could not listen on socket: %s", strerror(errno));
		goto error;
	}
	if (uid != -1 || gid != -1) {
		if (chown(path, uid, gid) == -1) {
			log_errorf("Could not chown socket to uid %d, gid %d: %s", uid, gid,
				   strerror(errno));
			goto error;
		}
		if (chmod(path, 0770) == -1) {
			log_errorf("Could not chmod socket: %s", strerror(errno));
			goto error;
		}
	}
	return fd;
error:
	close(fd);
	return -1;
}

int main(int argc, char *argv[]) {
	char *loglevel = getenv("SEATD_LOGLEVEL");
	enum libseat_log_level level = LIBSEAT_LOG_LEVEL_ERROR;
	if (loglevel != NULL) {
		if (strcmp(loglevel, "silent") == 0) {
			level = LIBSEAT_LOG_LEVEL_SILENT;
		} else if (strcmp(loglevel, "info") == 0) {
			level = LIBSEAT_LOG_LEVEL_INFO;
		} else if (strcmp(loglevel, "debug") == 0) {
			level = LIBSEAT_LOG_LEVEL_DEBUG;
		}
	}
	log_init();
	libseat_set_log_level(level);

	const char *usage = "Usage: seatd [options]\n"
			    "\n"
			    "  -h		Show this help message\n"
			    "  -n <fd>          FD to notify readiness on\n"
			    "  -u <user>	User to own the seatd socket\n"
			    "  -g <group>	Group to own the seatd socket\n"
			    "  -s <path>	Where to create the seatd socket\n"
			    "  -v		Show the version number\n"
			    "\n";

	int c;
	int uid = -1, gid = -1;
	int readiness = -1;
	const char *socket_path = getenv("SEATD_SOCK");
	while ((c = getopt(argc, argv, "vhn:s:g:u:")) != -1) {
		switch (c) {
		case 'n':
			readiness = atoi(optarg);
			if (readiness < 0) {
				fprintf(stderr, "Invalid readiness fd: %s\n", optarg);
				return 1;
			}
			break;
		case 's':
			socket_path = optarg;
			break;
		case 'u': {
			struct passwd *pw = getpwnam(optarg);
			if (pw == NULL) {
				fprintf(stderr, "Could not find user by name '%s'.\n", optarg);
				return 1;
			} else {
				uid = pw->pw_uid;
			}
			break;
		}
		case 'g': {
			struct group *gr = getgrnam(optarg);
			if (gr == NULL) {
				fprintf(stderr, "Could not find group by name '%s'.\n", optarg);
				return 1;
			} else {
				gid = gr->gr_gid;
			}
			break;
		}
		case 'v':
			printf("seatd version %s\n", SEATD_VERSION);
			return 0;
		case 'h':
			printf("%s", usage);
			return 0;
		case '?':
			fprintf(stderr, "Try '%s -h' for more information.\n", argv[0]);
			return 1;
		default:
			abort();
		}
	}

	if (socket_path == NULL) {
		socket_path = SEATD_DEFAULTPATH;
		struct stat st;
		if (stat(socket_path, &st) == 0) {
			log_info("Removing leftover seatd socket");
			unlink(socket_path);
		}
	}

	struct server server = {0};
	if (server_init(&server) == -1) {
		log_errorf("server_create failed: %s", strerror(errno));
		return 1;
	}

	int socket_fd = open_socket(socket_path, uid, gid);
	if (socket_fd == -1) {
		log_error("Could not create server socket");
		server_finish(&server);
		return 1;
	}
	if (poller_add_fd(&server.poller, socket_fd, EVENT_READABLE, server_handle_connection,
			  &server) == NULL) {
		log_errorf("Could not add socket to poller: %s", strerror(errno));
		close(socket_fd);
		server_finish(&server);
		return 1;
	}

	log_info("seatd started");

	if (readiness != -1) {
		if (write(readiness, "\n", 1) == -1) {
			log_errorf("Could not write readiness signal: %s\n", strerror(errno));
		}
		close(readiness);
	}

	while (server.running) {
		if (poller_poll(&server.poller) == -1) {
			log_errorf("Poller failed: %s", strerror(errno));
			return 1;
		}
	}

	server_finish(&server);
	unlink(socket_path);
	log_info("seatd stopped");
	return 0;
}