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 written = ubus_msg_writev(sock->fd, ub, cl->txq_ofs); 87 if (written < 0) { 88 switch(errno) { 89 case EINTR: 90 case EAGAIN: 91 break; 92 default: 93 goto disconnect; 94 } 95 break; 96 } 97 98 cl->txq_ofs += written; 99 cl->txq_len -= written; 100 if (cl->txq_ofs < ub->len + sizeof(ub->hdr)) 101 break; 102 103 cl->txq_ofs = 0; 104 ubus_msg_list_free(ubl); 105 } 106 107 if (list_empty(&cl->tx_queue) && (events & ULOOP_WRITE)) { 108 /* Process queued commands */ 109 ubus_client_cmd_queue_process(cl); 110 111 /* prevent further ULOOP_WRITE events if we don't have data 112 * to send anymore */ 113 if (list_empty(&cl->tx_queue)) 114 uloop_fd_add(sock, ULOOP_READ | ULOOP_EDGE_TRIGGER); 115 } 116 117 retry: 118 if (!sock->eof && cl->pending_msg_offset < (int) sizeof(cl->hdrbuf)) { 119 int offset = cl->pending_msg_offset; 120 int bytes; 121 122 *pfd = -1; 123 124 iov.iov_base = ((char *) &cl->hdrbuf) + offset; 125 iov.iov_len = sizeof(cl->hdrbuf) - offset; 126 127 if (cl->pending_msg_fd < 0) { 128 msghdr.msg_control = fd_buf; 129 msghdr.msg_controllen = cmsg->cmsg_len; 130 } else { 131 msghdr.msg_control = NULL; 132 msghdr.msg_controllen = 0; 133 } 134 135 bytes = recvmsg(sock->fd, &msghdr, 0); 136 if (bytes < 0) 137 goto out; 138 139 if (*pfd >= 0) 140 cl->pending_msg_fd = *pfd; 141 142 cl->pending_msg_offset += bytes; 143 if (cl->pending_msg_offset < (int) sizeof(cl->hdrbuf)) 144 goto out; 145 146 if (blob_raw_len(&cl->hdrbuf.data) < sizeof(struct blob_attr)) 147 goto disconnect; 148 if (blob_pad_len(&cl->hdrbuf.data) > UBUS_MAX_MSGLEN) 149 goto disconnect; 150 151 cl->pending_msg = ubus_msg_new(NULL, blob_raw_len(&cl->hdrbuf.data), false); 152 if (!cl->pending_msg) 153 goto disconnect; 154 155 cl->hdrbuf.hdr.seq = be16_to_cpu(cl->hdrbuf.hdr.seq); 156 cl->hdrbuf.hdr.peer = be32_to_cpu(cl->hdrbuf.hdr.peer); 157 158 memcpy(&cl->pending_msg->hdr, &cl->hdrbuf.hdr, sizeof(cl->hdrbuf.hdr)); 159 memcpy(cl->pending_msg->data, &cl->hdrbuf.data, sizeof(cl->hdrbuf.data)); 160 } 161 162 ub = cl->pending_msg; 163 if (ub) { 164 int offset = cl->pending_msg_offset - sizeof(ub->hdr); 165 int len = blob_raw_len(ub->data) - offset; 166 int bytes = 0; 167 168 if (len > 0) { 169 bytes = read(sock->fd, (char *) ub->data + offset, len); 170 if (bytes <= 0) 171 goto out; 172 } 173 174 if (bytes < len) { 175 cl->pending_msg_offset += bytes; 176 goto out; 177 } 178 179 /* accept message */ 180 ub->fd = cl->pending_msg_fd; 181 cl->pending_msg_fd = -1; 182 cl->pending_msg_offset = 0; 183 cl->pending_msg = NULL; 184 ubusd_monitor_message(cl, ub, false); 185 ubusd_proto_receive_message(cl, ub); 186 goto retry; 187 } 188 189 out: 190 if (!sock->eof || !list_empty(&cl->tx_queue)) 191 return; 192 193 disconnect: 194 handle_client_disconnect(cl); 195 } 196 197 static bool get_next_connection(int fd) 198 { 199 struct ubus_client *cl; 200 int client_fd; 201 202 client_fd = accept(fd, NULL, 0); 203 if (client_fd < 0) { 204 switch (errno) { 205 case ECONNABORTED: 206 case EINTR: 207 return true; 208 default: 209 return false; 210 } 211 } 212 213 cl = ubusd_proto_new_client(client_fd, client_cb); 214 if (cl) 215 uloop_fd_add(&cl->sock, ULOOP_READ | ULOOP_EDGE_TRIGGER); 216 else 217 close(client_fd); 218 219 return true; 220 } 221 222 static void server_cb(struct uloop_fd *fd, unsigned int events) 223 { 224 bool next; 225 226 do { 227 next = get_next_connection(fd->fd); 228 } while (next); 229 } 230 231 static struct uloop_fd server_fd = { 232 .cb = server_cb, 233 }; 234 235 static int usage(const char *progname) 236 { 237 fprintf(stderr, "Usage: %s [<options>]\n" 238 "Options: \n" 239 " -A <path>: Set the path to ACL files\n" 240 " -s <socket>: Set the unix domain socket to listen on\n" 241 "\n", progname); 242 return 1; 243 } 244 245 static void sighup_handler(int sig) 246 { 247 ubusd_acl_load(); 248 } 249 250 static void mkdir_sockdir() 251 { 252 char *ubus_sock_dir, *tmp; 253 254 ubus_sock_dir = strdup(UBUS_UNIX_SOCKET); 255 tmp = strrchr(ubus_sock_dir, '/'); 256 if (tmp) { 257 *tmp = '\0'; 258 mkdir(ubus_sock_dir, 0755); 259 } 260 free(ubus_sock_dir); 261 } 262 263 #include <libubox/ulog.h> 264 265 int main(int argc, char **argv) 266 { 267 const char *ubus_socket = UBUS_UNIX_SOCKET; 268 int ret = 0; 269 int ch; 270 271 signal(SIGPIPE, SIG_IGN); 272 signal(SIGHUP, sighup_handler); 273 274 ulog_open(ULOG_KMSG | ULOG_SYSLOG, LOG_DAEMON, "ubusd"); 275 openlog("ubusd", LOG_PID, LOG_DAEMON); 276 uloop_init(); 277 278 while ((ch = getopt(argc, argv, "A:s:")) != -1) { 279 switch (ch) { 280 case 's': 281 ubus_socket = optarg; 282 break; 283 case 'A': 284 ubusd_acl_dir = optarg; 285 break; 286 default: 287 return usage(argv[0]); 288 } 289 } 290 291 mkdir_sockdir(); 292 unlink(ubus_socket); 293 umask(0111); 294 server_fd.fd = usock(USOCK_UNIX | USOCK_SERVER | USOCK_NONBLOCK, ubus_socket, NULL); 295 if (server_fd.fd < 0) { 296 perror("usock"); 297 ret = -1; 298 goto out; 299 } 300 uloop_fd_add(&server_fd, ULOOP_READ | ULOOP_EDGE_TRIGGER); 301 ubusd_acl_load(); 302 303 uloop_run(); 304 unlink(ubus_socket); 305 306 out: 307 uloop_done(); 308 return ret; 309 } 310
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