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 <libubus.h> 28 29 #include "syslog.h" 30 31 int debug = 0; 32 static struct blob_buf b; 33 static struct ubus_auto_conn conn; 34 static LIST_HEAD(clients); 35 36 enum { 37 READ_LINES, 38 READ_STREAM, 39 READ_ONESHOT, 40 __READ_MAX 41 }; 42 43 static const struct blobmsg_policy read_policy[__READ_MAX] = { 44 [READ_LINES] = { .name = "lines", .type = BLOBMSG_TYPE_INT32 }, 45 [READ_STREAM] = { .name = "stream", .type = BLOBMSG_TYPE_BOOL }, 46 [READ_ONESHOT] = { .name = "oneshot", .type = BLOBMSG_TYPE_BOOL }, 47 }; 48 49 static const struct blobmsg_policy write_policy = 50 { .name = "event", .type = BLOBMSG_TYPE_STRING }; 51 52 struct client { 53 struct list_head list; 54 55 struct ustream_fd s; 56 int fd; 57 }; 58 59 static void 60 client_close(struct ustream *s) 61 { 62 struct client *cl = container_of(s, struct client, s.stream); 63 64 list_del(&cl->list); 65 ustream_free(s); 66 close(cl->fd); 67 free(cl); 68 } 69 70 static void client_notify_state(struct ustream *s) 71 { 72 client_close(s); 73 } 74 75 static void client_notify_write(struct ustream *s, int bytes) 76 { 77 if (ustream_pending_data(s, true)) 78 return; 79 80 client_close(s); 81 } 82 83 static void 84 log_fill_msg(struct blob_buf *b, struct log_head *l) 85 { 86 blobmsg_add_string(b, "msg", l->data); 87 blobmsg_add_u32(b, "id", l->id); 88 blobmsg_add_u32(b, "priority", l->priority); 89 blobmsg_add_u32(b, "source", l->source); 90 blobmsg_add_u64(b, "time", (((__u64) l->ts.tv_sec) * 1000) + (l->ts.tv_nsec / 1000000)); 91 } 92 93 static int 94 read_log(struct ubus_context *ctx, struct ubus_object *obj, 95 struct ubus_request_data *req, const char *method, 96 struct blob_attr *msg) 97 { 98 struct client *cl; 99 struct blob_attr *tb[__READ_MAX] = {}; 100 struct log_head *l; 101 int count = 0; 102 int fds[2]; 103 int ret; 104 bool stream = true; 105 bool oneshot = false; 106 void *c, *e; 107 108 if (!stream) 109 count = 100; 110 111 if (msg) { 112 blobmsg_parse(read_policy, __READ_MAX, tb, blob_data(msg), blob_len(msg)); 113 if (tb[READ_LINES]) 114 count = blobmsg_get_u32(tb[READ_LINES]); 115 if (tb[READ_STREAM]) 116 stream = blobmsg_get_bool(tb[READ_STREAM]); 117 if (tb[READ_ONESHOT]) 118 oneshot = blobmsg_get_bool(tb[READ_ONESHOT]); 119 } 120 121 l = log_list(count, NULL); 122 if (stream) { 123 if (pipe(fds) == -1) { 124 fprintf(stderr, "logd: failed to create pipe: %m\n"); 125 return -1; 126 } 127 128 ubus_request_set_fd(ctx, req, fds[0]); 129 cl = calloc(1, sizeof(*cl)); 130 cl->s.stream.notify_state = client_notify_state; 131 cl->fd = fds[1]; 132 ustream_fd_init(&cl->s, cl->fd); 133 list_add(&cl->list, &clients); 134 while ((!tb[READ_LINES] || count) && l) { 135 blob_buf_init(&b, 0); 136 log_fill_msg(&b, l); 137 l = log_list(count, l); 138 ret = ustream_write(&cl->s.stream, (void *) b.head, blob_len(b.head) + sizeof(struct blob_attr), false); 139 if (ret < 0) 140 break; 141 } 142 143 if (oneshot) { 144 cl->s.stream.notify_write = client_notify_write; 145 client_notify_write(&cl->s.stream, 0); 146 } 147 } else { 148 blob_buf_init(&b, 0); 149 c = blobmsg_open_array(&b, "log"); 150 while ((!tb[READ_LINES] || count) && l) { 151 e = blobmsg_open_table(&b, NULL); 152 log_fill_msg(&b, l); 153 blobmsg_close_table(&b, e); 154 l = log_list(count, l); 155 } 156 blobmsg_close_array(&b, c); 157 ubus_send_reply(ctx, req, b.head); 158 } 159 blob_buf_free(&b); 160 return 0; 161 } 162 163 static int 164 write_log(struct ubus_context *ctx, struct ubus_object *obj, 165 struct ubus_request_data *req, const char *method, 166 struct blob_attr *msg) 167 { 168 struct blob_attr *tb; 169 char *event; 170 171 if (msg) { 172 int len; 173 174 blobmsg_parse(&write_policy, 1, &tb, blob_data(msg), blob_len(msg)); 175 if (tb) { 176 event = blobmsg_get_string(tb); 177 len = strlen(event) + 1; 178 if (len > LOG_LINE_SIZE) { 179 len = LOG_LINE_SIZE; 180 event[len - 1] = 0; 181 } 182 183 log_add(event, len, SOURCE_SYSLOG); 184 } 185 } 186 187 return 0; 188 } 189 190 static const struct ubus_method log_methods[] = { 191 UBUS_METHOD("read", read_log, read_policy), 192 { .name = "write", .handler = write_log, .policy = &write_policy, .n_policy = 1 }, 193 }; 194 195 static struct ubus_object_type log_object_type = 196 UBUS_OBJECT_TYPE("log", log_methods); 197 198 static struct ubus_object log_object = { 199 .name = "log", 200 .type = &log_object_type, 201 .methods = log_methods, 202 .n_methods = ARRAY_SIZE(log_methods), 203 }; 204 205 void 206 ubus_notify_log(struct log_head *l) 207 { 208 struct client *c; 209 210 if (list_empty(&clients) && !log_object.has_subscribers) 211 return; 212 213 blob_buf_init(&b, 0); 214 blobmsg_add_string(&b, "msg", l->data); 215 blobmsg_add_u32(&b, "id", l->id); 216 blobmsg_add_u32(&b, "priority", l->priority); 217 blobmsg_add_u32(&b, "source", l->source); 218 blobmsg_add_u64(&b, "time", (((__u64) l->ts.tv_sec) * 1000) + (l->ts.tv_nsec / 1000000)); 219 220 if (log_object.has_subscribers) 221 ubus_notify(&conn.ctx, &log_object, "message", b.head, -1); 222 223 list_for_each_entry(c, &clients, list) 224 ustream_write(&c->s.stream, (void *) b.head, blob_len(b.head) + sizeof(struct blob_attr), false); 225 226 blob_buf_free(&b); 227 } 228 229 static void 230 ubus_connect_handler(struct ubus_context *ctx) 231 { 232 int ret; 233 234 ret = ubus_add_object(ctx, &log_object); 235 if (ret) { 236 fprintf(stderr, "Failed to add object: %s\n", ubus_strerror(ret)); 237 exit(1); 238 } 239 fprintf(stderr, "log: connected to ubus\n"); 240 } 241 242 int 243 main(int argc, char **argv) 244 { 245 int ch, log_size = 16; 246 struct passwd *p = NULL; 247 248 signal(SIGPIPE, SIG_IGN); 249 while ((ch = getopt(argc, argv, "S:")) != -1) { 250 switch (ch) { 251 case 'S': 252 log_size = atoi(optarg); 253 if (log_size < 1) 254 log_size = 16; 255 break; 256 } 257 } 258 log_size *= 1024; 259 260 uloop_init(); 261 log_init(log_size); 262 conn.cb = ubus_connect_handler; 263 ubus_auto_connect(&conn); 264 p = getpwnam("logd"); 265 if (p) { 266 if (setgid(p->pw_gid) < 0) { 267 fprintf(stderr, "setgid() failed: %s\n", strerror(errno)); 268 exit(1); 269 } 270 271 if (setuid(p->pw_uid) < 0) { 272 fprintf(stderr, "setuid() failed: %s\n", strerror(errno)); 273 exit(1); 274 } 275 } 276 uloop_run(); 277 log_shutdown(); 278 uloop_done(); 279 ubus_auto_shutdown(&conn); 280 281 return 0; 282 } 283
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