1 /* 2 * Copyright (C) 2013 John Crispin <blogic@openwrt.org> 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU Lesser General Public License version 2.1 6 * as published by the Free Software Foundation 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 */ 13 14 #include <sys/types.h> 15 #include <pwd.h> 16 #include <stdio.h> 17 #include <unistd.h> 18 #include <syslog.h> 19 #include <unistd.h> 20 21 #include <linux/types.h> 22 23 #include <libubox/uloop.h> 24 #include <libubox/blobmsg.h> 25 #include <libubox/list.h> 26 #include <libubox/ustream.h> 27 #include <libubox/utils.h> 28 #include <libubus.h> 29 30 #include "syslog.h" 31 32 int debug = 0; 33 static struct blob_buf b; 34 static struct ubus_auto_conn conn; 35 static struct udebug_ubus udebug; 36 static LIST_HEAD(clients); 37 38 enum { 39 READ_LINES, 40 READ_STREAM, 41 READ_ONESHOT, 42 __READ_MAX 43 }; 44 45 static const struct blobmsg_policy read_policy[__READ_MAX] = { 46 [READ_LINES] = { .name = "lines", .type = BLOBMSG_TYPE_INT32 }, 47 [READ_STREAM] = { .name = "stream", .type = BLOBMSG_TYPE_BOOL }, 48 [READ_ONESHOT] = { .name = "oneshot", .type = BLOBMSG_TYPE_BOOL }, 49 }; 50 51 static const struct blobmsg_policy write_policy = 52 { .name = "event", .type = BLOBMSG_TYPE_STRING }; 53 54 struct client { 55 struct list_head list; 56 57 struct ustream_fd s; 58 int fd; 59 }; 60 61 static void 62 client_close(struct ustream *s) 63 { 64 struct client *cl = container_of(s, struct client, s.stream); 65 66 list_del(&cl->list); 67 ustream_free(s); 68 close(cl->fd); 69 free(cl); 70 } 71 72 static void client_notify_state(struct ustream *s) 73 { 74 client_close(s); 75 } 76 77 static void client_notify_write(struct ustream *s, int bytes) 78 { 79 if (ustream_pending_data(s, true)) 80 return; 81 82 client_close(s); 83 } 84 85 static void 86 log_fill_msg(struct blob_buf *b, struct log_head *l) 87 { 88 blobmsg_add_string(b, "msg", l->data); 89 blobmsg_add_u32(b, "id", l->id); 90 blobmsg_add_u32(b, "priority", l->priority); 91 blobmsg_add_u32(b, "source", l->source); 92 blobmsg_add_u64(b, "time", (((__u64) l->ts.tv_sec) * 1000) + (l->ts.tv_nsec / 1000000)); 93 } 94 95 static int 96 read_log(struct ubus_context *ctx, struct ubus_object *obj, 97 struct ubus_request_data *req, const char *method, 98 struct blob_attr *msg) 99 { 100 struct client *cl; 101 struct blob_attr *tb[__READ_MAX] = {}; 102 struct log_head *l; 103 int count = 0; 104 int fds[2]; 105 int ret; 106 bool stream = true; 107 bool oneshot = false; 108 void *c, *e; 109 110 if (!stream) 111 count = 100; 112 113 if (msg) { 114 blobmsg_parse(read_policy, __READ_MAX, tb, blob_data(msg), blob_len(msg)); 115 if (tb[READ_LINES]) 116 count = blobmsg_get_u32(tb[READ_LINES]); 117 if (tb[READ_STREAM]) 118 stream = blobmsg_get_bool(tb[READ_STREAM]); 119 if (tb[READ_ONESHOT]) 120 oneshot = blobmsg_get_bool(tb[READ_ONESHOT]); 121 } 122 123 l = log_list(count, NULL); 124 if (stream) { 125 if (pipe(fds) == -1) { 126 fprintf(stderr, "logd: failed to create pipe: %m\n"); 127 return -1; 128 } 129 130 ubus_request_set_fd(ctx, req, fds[0]); 131 cl = calloc(1, sizeof(*cl)); 132 cl->s.stream.notify_state = client_notify_state; 133 cl->fd = fds[1]; 134 ustream_fd_init(&cl->s, cl->fd); 135 list_add(&cl->list, &clients); 136 while ((!tb[READ_LINES] || count) && l) { 137 blob_buf_init(&b, 0); 138 log_fill_msg(&b, l); 139 l = log_list(count, l); 140 ret = ustream_write(&cl->s.stream, (void *) b.head, blob_len(b.head) + sizeof(struct blob_attr), false); 141 if (ret < 0) 142 break; 143 } 144 145 if (oneshot) { 146 cl->s.stream.notify_write = client_notify_write; 147 client_notify_write(&cl->s.stream, 0); 148 } 149 } else { 150 blob_buf_init(&b, 0); 151 c = blobmsg_open_array(&b, "log"); 152 while ((!tb[READ_LINES] || count) && l) { 153 e = blobmsg_open_table(&b, NULL); 154 log_fill_msg(&b, l); 155 blobmsg_close_table(&b, e); 156 l = log_list(count, l); 157 } 158 blobmsg_close_array(&b, c); 159 ubus_send_reply(ctx, req, b.head); 160 } 161 blob_buf_free(&b); 162 return 0; 163 } 164 165 static int 166 write_log(struct ubus_context *ctx, struct ubus_object *obj, 167 struct ubus_request_data *req, const char *method, 168 struct blob_attr *msg) 169 { 170 struct blob_attr *tb; 171 char *event; 172 173 if (msg) { 174 int len; 175 176 blobmsg_parse(&write_policy, 1, &tb, blob_data(msg), blob_len(msg)); 177 if (tb) { 178 event = blobmsg_get_string(tb); 179 len = strlen(event) + 1; 180 if (len > LOG_LINE_SIZE) { 181 len = LOG_LINE_SIZE; 182 event[len - 1] = 0; 183 } 184 185 log_add(event, len, SOURCE_SYSLOG); 186 } 187 } 188 189 return 0; 190 } 191 192 static const struct ubus_method log_methods[] = { 193 UBUS_METHOD("read", read_log, read_policy), 194 { .name = "write", .handler = write_log, .policy = &write_policy, .n_policy = 1 }, 195 }; 196 197 static struct ubus_object_type log_object_type = 198 UBUS_OBJECT_TYPE("log", log_methods); 199 200 static struct ubus_object log_object = { 201 .name = "log", 202 .type = &log_object_type, 203 .methods = log_methods, 204 .n_methods = ARRAY_SIZE(log_methods), 205 }; 206 207 void 208 ubus_notify_log(struct log_head *l) 209 { 210 struct client *c; 211 212 if (list_empty(&clients) && !log_object.has_subscribers) 213 return; 214 215 blob_buf_init(&b, 0); 216 blobmsg_add_string(&b, "msg", l->data); 217 blobmsg_add_u32(&b, "id", l->id); 218 blobmsg_add_u32(&b, "priority", l->priority); 219 blobmsg_add_u32(&b, "source", l->source); 220 blobmsg_add_u64(&b, "time", (((__u64) l->ts.tv_sec) * 1000) + (l->ts.tv_nsec / 1000000)); 221 222 if (log_object.has_subscribers) 223 ubus_notify(&conn.ctx, &log_object, "message", b.head, -1); 224 225 list_for_each_entry(c, &clients, list) 226 ustream_write(&c->s.stream, (void *) b.head, blob_len(b.head) + sizeof(struct blob_attr), false); 227 228 blob_buf_free(&b); 229 } 230 231 static void 232 ubus_connect_handler(struct ubus_context *ctx) 233 { 234 int ret; 235 236 ret = ubus_add_object(ctx, &log_object); 237 if (ret) { 238 fprintf(stderr, "Failed to add object: %s\n", ubus_strerror(ret)); 239 exit(1); 240 } 241 fprintf(stderr, "log: connected to ubus\n"); 242 } 243 244 int 245 main(int argc, char **argv) 246 { 247 int ch, log_size = 16; 248 struct passwd *p = NULL; 249 250 signal(SIGPIPE, SIG_IGN); 251 while ((ch = getopt(argc, argv, "S:")) != -1) { 252 switch (ch) { 253 case 'S': 254 log_size = atoi(optarg); 255 if (log_size < 1) 256 log_size = 16; 257 break; 258 } 259 } 260 log_size *= 1024; 261 262 uloop_init(); 263 log_init(log_size); 264 conn.cb = ubus_connect_handler; 265 ubus_auto_connect(&conn); 266 udebug_ubus_init(&udebug, &conn.ctx, "log", log_udebug_config); 267 p = getpwnam("logd"); 268 if (p) { 269 if (setgid(p->pw_gid) < 0) { 270 fprintf(stderr, "setgid() failed: %s\n", strerror(errno)); 271 exit(1); 272 } 273 274 if (setuid(p->pw_uid) < 0) { 275 fprintf(stderr, "setuid() failed: %s\n", strerror(errno)); 276 exit(1); 277 } 278 } 279 uloop_run(); 280 udebug_ubus_free(&udebug); 281 log_shutdown(); 282 uloop_done(); 283 ubus_auto_shutdown(&conn); 284 285 return 0; 286 } 287
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