1 /* 2 * Copyright (C) 2011-2014 Felix Fietkau <nbd@openwrt.org> 3 * 4 * SPDX-License-Identifier: LGPL-2.1-only 5 */ 6 7 #include <sys/socket.h> 8 #include <sys/stat.h> 9 #include <sys/types.h> 10 #ifdef FreeBSD 11 #include <sys/param.h> 12 #endif 13 #include <string.h> 14 #include <syslog.h> 15 16 #include <libubox/usock.h> 17 18 #include "ubusd.h" 19 20 static void handle_client_disconnect(struct ubus_client *cl) 21 { 22 struct ubus_msg_buf_list *ubl, *ubl2; 23 list_for_each_entry_safe(ubl, ubl2, &cl->tx_queue, list) 24 ubus_msg_list_free(ubl); 25 26 ubusd_monitor_disconnect(cl); 27 ubusd_proto_free_client(cl); 28 if (cl->pending_msg_fd >= 0) 29 close(cl->pending_msg_fd); 30 uloop_fd_delete(&cl->sock); 31 close(cl->sock.fd); 32 free(cl); 33 } 34 35 static void ubus_client_cmd_free(struct ubus_client_cmd *cmd) 36 { 37 list_del(&cmd->list); 38 ubus_msg_free(cmd->msg); 39 free(cmd); 40 } 41 42 static void ubus_client_cmd_queue_process(struct ubus_client *cl) 43 { 44 struct ubus_client_cmd *cmd, *tmp; 45 46 list_for_each_entry_safe(cmd, tmp, &cl->cmd_queue, list) { 47 int ret = ubusd_cmd_lookup(cl, cmd); 48 49 /* Stop if the last command caused buffering again */ 50 if (ret == -2) 51 break; 52 53 ubus_client_cmd_free(cmd); 54 } 55 } 56 57 static void client_cb(struct uloop_fd *sock, unsigned int events) 58 { 59 struct ubus_client *cl = container_of(sock, struct ubus_client, sock); 60 uint8_t fd_buf[CMSG_SPACE(sizeof(int))] = { 0 }; 61 struct msghdr msghdr = { 0 }; 62 struct ubus_msg_buf *ub; 63 struct ubus_msg_buf_list *ubl, *ubl2; 64 static struct iovec iov; 65 struct cmsghdr *cmsg; 66 int *pfd; 67 68 msghdr.msg_iov = &iov, 69 msghdr.msg_iovlen = 1, 70 msghdr.msg_control = fd_buf; 71 msghdr.msg_controllen = sizeof(fd_buf); 72 73 cmsg = CMSG_FIRSTHDR(&msghdr); 74 cmsg->cmsg_type = SCM_RIGHTS; 75 cmsg->cmsg_level = SOL_SOCKET; 76 cmsg->cmsg_len = CMSG_LEN(sizeof(int)); 77 78 pfd = (int *) CMSG_DATA(cmsg); 79 msghdr.msg_controllen = cmsg->cmsg_len; 80 81 /* first try to tx more pending data */ 82 list_for_each_entry_safe(ubl, ubl2, &cl->tx_queue, list) { 83 ssize_t written; 84 85 ub = ubl->msg; 86 retry_writev: 87 written = ubus_msg_writev(sock->fd, ub, cl->txq_ofs); 88 if (written < 0) { 89 switch(errno) { 90 case EINTR: 91 goto retry_writev; 92 case EAGAIN: 93 case EACCES: 94 break; 95 default: 96 goto disconnect; 97 } 98 break; 99 } 100 101 cl->txq_ofs += written; 102 cl->txq_len -= written; 103 if (cl->txq_ofs < ub->len + sizeof(ub->hdr)) 104 goto retry_writev; 105 106 cl->txq_ofs = 0; 107 ubus_msg_list_free(ubl); 108 } 109 110 if (list_empty(&cl->tx_queue) && (events & ULOOP_WRITE)) { 111 /* Process queued commands */ 112 ubus_client_cmd_queue_process(cl); 113 114 /* prevent further ULOOP_WRITE events if we don't have data 115 * to send anymore */ 116 if (list_empty(&cl->tx_queue)) 117 uloop_fd_add(sock, ULOOP_READ | ULOOP_EDGE_TRIGGER); 118 } 119 120 retry: 121 if (!sock->eof && cl->pending_msg_offset < (int) sizeof(cl->hdrbuf)) { 122 int offset = cl->pending_msg_offset; 123 int bytes; 124 125 *pfd = -1; 126 127 iov.iov_base = ((char *) &cl->hdrbuf) + offset; 128 iov.iov_len = sizeof(cl->hdrbuf) - offset; 129 130 if (cl->pending_msg_fd < 0) { 131 msghdr.msg_control = fd_buf; 132 msghdr.msg_controllen = cmsg->cmsg_len; 133 } else { 134 msghdr.msg_control = NULL; 135 msghdr.msg_controllen = 0; 136 } 137 138 bytes = recvmsg(sock->fd, &msghdr, 0); 139 if (bytes < 0) 140 goto out; 141 142 if (*pfd >= 0) 143 cl->pending_msg_fd = *pfd; 144 145 cl->pending_msg_offset += bytes; 146 if (cl->pending_msg_offset < (int) sizeof(cl->hdrbuf)) 147 goto out; 148 149 if (blob_raw_len(&cl->hdrbuf.data) < sizeof(struct blob_attr)) 150 goto disconnect; 151 if (blob_pad_len(&cl->hdrbuf.data) > UBUS_MAX_MSGLEN) 152 goto disconnect; 153 154 cl->pending_msg = ubus_msg_new(NULL, blob_raw_len(&cl->hdrbuf.data), false); 155 if (!cl->pending_msg) 156 goto disconnect; 157 158 cl->hdrbuf.hdr.seq = be16_to_cpu(cl->hdrbuf.hdr.seq); 159 cl->hdrbuf.hdr.peer = be32_to_cpu(cl->hdrbuf.hdr.peer); 160 161 memcpy(&cl->pending_msg->hdr, &cl->hdrbuf.hdr, sizeof(cl->hdrbuf.hdr)); 162 memcpy(cl->pending_msg->data, &cl->hdrbuf.data, sizeof(cl->hdrbuf.data)); 163 } 164 165 ub = cl->pending_msg; 166 if (ub) { 167 int offset = cl->pending_msg_offset - sizeof(ub->hdr); 168 int len = blob_raw_len(ub->data) - offset; 169 int bytes = 0; 170 171 if (len > 0) { 172 bytes = read(sock->fd, (char *) ub->data + offset, len); 173 if (bytes <= 0) 174 goto out; 175 } 176 177 if (bytes < len) { 178 cl->pending_msg_offset += bytes; 179 goto out; 180 } 181 182 /* accept message */ 183 ub->fd = cl->pending_msg_fd; 184 cl->pending_msg_fd = -1; 185 cl->pending_msg_offset = 0; 186 cl->pending_msg = NULL; 187 ubusd_monitor_message(cl, ub, false); 188 ubusd_proto_receive_message(cl, ub); 189 goto retry; 190 } 191 192 out: 193 if (!sock->eof || !list_empty(&cl->tx_queue)) 194 return; 195 196 disconnect: 197 handle_client_disconnect(cl); 198 } 199 200 static bool get_next_connection(int fd) 201 { 202 struct ubus_client *cl; 203 int client_fd; 204 205 client_fd = accept(fd, NULL, 0); 206 if (client_fd < 0) { 207 switch (errno) { 208 case ECONNABORTED: 209 case EINTR: 210 return true; 211 default: 212 return false; 213 } 214 } 215 216 cl = ubusd_proto_new_client(client_fd, client_cb); 217 if (cl) 218 uloop_fd_add(&cl->sock, ULOOP_READ | ULOOP_EDGE_TRIGGER); 219 else 220 close(client_fd); 221 222 return true; 223 } 224 225 static void server_cb(struct uloop_fd *fd, unsigned int events) 226 { 227 bool next; 228 229 do { 230 next = get_next_connection(fd->fd); 231 } while (next); 232 } 233 234 static struct uloop_fd server_fd = { 235 .cb = server_cb, 236 }; 237 238 static int usage(const char *progname) 239 { 240 fprintf(stderr, "Usage: %s [<options>]\n" 241 "Options: \n" 242 " -A <path>: Set the path to ACL files\n" 243 " -s <socket>: Set the unix domain socket to listen on\n" 244 "\n", progname); 245 return 1; 246 } 247 248 static void sighup_handler(int sig) 249 { 250 ubusd_acl_load(); 251 } 252 253 static void mkdir_sockdir() 254 { 255 char *ubus_sock_dir, *tmp; 256 257 ubus_sock_dir = strdup(UBUS_UNIX_SOCKET); 258 tmp = strrchr(ubus_sock_dir, '/'); 259 if (tmp) { 260 *tmp = '\0'; 261 mkdir(ubus_sock_dir, 0755); 262 } 263 free(ubus_sock_dir); 264 } 265 266 #include <libubox/ulog.h> 267 268 int main(int argc, char **argv) 269 { 270 const char *ubus_socket = UBUS_UNIX_SOCKET; 271 int ret = 0; 272 int ch; 273 274 signal(SIGPIPE, SIG_IGN); 275 signal(SIGHUP, sighup_handler); 276 277 ulog_open(ULOG_KMSG | ULOG_SYSLOG, LOG_DAEMON, "ubusd"); 278 openlog("ubusd", LOG_PID, LOG_DAEMON); 279 uloop_init(); 280 281 while ((ch = getopt(argc, argv, "A:s:")) != -1) { 282 switch (ch) { 283 case 's': 284 ubus_socket = optarg; 285 break; 286 case 'A': 287 ubusd_acl_dir = optarg; 288 break; 289 default: 290 return usage(argv[0]); 291 } 292 } 293 294 mkdir_sockdir(); 295 unlink(ubus_socket); 296 umask(0111); 297 server_fd.fd = usock(USOCK_UNIX | USOCK_SERVER | USOCK_NONBLOCK, ubus_socket, NULL); 298 if (server_fd.fd < 0) { 299 perror("usock"); 300 ret = -1; 301 goto out; 302 } 303 uloop_fd_add(&server_fd, ULOOP_READ | ULOOP_EDGE_TRIGGER); 304 ubusd_acl_load(); 305 306 uloop_run(); 307 unlink(ubus_socket); 308 309 out: 310 uloop_done(); 311 return ret; 312 } 313
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