Revision cd831bd7 qemu-nbd.c
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/*\
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/* |
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* Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws> |
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* |
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* Network Block Device |
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#include <stdio.h> |
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#include <getopt.h> |
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#include <err.h> |
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <netinet/in.h> |
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#include <netinet/tcp.h> |
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#include <arpa/inet.h> |
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#include <signal.h> |
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#define SOCKET_PATH "/var/lock/qemu-nbd-%s" |
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int verbose; |
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|
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" -p, --port=PORT port to listen on (default `1024')\n" |
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" -o, --offset=OFFSET offset into the image\n" |
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" -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n" |
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" -k, --socket=PATH path to the unix socket\n" |
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" (default '"SOCKET_PATH"')\n" |
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" -r, --read-only export read-only\n" |
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" -P, --partition=NUM only expose partition NUM\n" |
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" -c, --connect=DEV connect FILE to the local NBD device DEV\n" |
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" -d, --disconnect disconnect the specified device\n" |
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" -v, --verbose display extra debugging information\n" |
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" -h, --help display this help and exit\n" |
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" -V, --version output version information and exit\n" |
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"\n" |
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"Report bugs to <anthony@codemonkey.ws>\n" |
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, name); |
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, name, "DEVICE");
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} |
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static void version(const char *name) |
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return -1; |
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} |
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static void show_parts(const char *device) |
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{
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if (fork() == 0) {
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int nbd; |
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/* linux just needs an open() to trigger |
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* the partition table update |
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* but remember to load the module with max_part != 0 : |
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* modprobe nbd max_part=63 |
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*/ |
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nbd = open(device, O_RDWR); |
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if (nbd != -1) |
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close(nbd); |
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exit(0); |
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} |
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} |
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int main(int argc, char **argv) |
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{
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BlockDriverState *bs; |
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off_t dev_offset = 0; |
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off_t offset = 0; |
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bool readonly = false; |
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bool disconnect = false; |
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const char *bindto = "0.0.0.0"; |
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int port = 1024; |
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int sock, csock; |
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struct sockaddr_in addr; |
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socklen_t addr_len = sizeof(addr); |
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off_t fd_size; |
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const char *sopt = "hVbo:p:rsP:v"; |
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char *device = NULL; |
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char *socket = NULL; |
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char sockpath[128]; |
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const char *sopt = "hVbo:p:rsP:c:dvk:"; |
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struct option lopt[] = {
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{ "help", 0, 0, 'h' },
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{ "version", 0, 0, 'V' },
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{ "bind", 1, 0, 'b' },
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{ "port", 1, 0, 'p' },
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{ "socket", 1, 0, 'k' },
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{ "offset", 1, 0, 'o' },
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{ "read-only", 0, 0, 'r' },
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{ "partition", 1, 0, 'P' },
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{ "connect", 1, 0, 'c' },
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{ "disconnect", 0, 0, 'd' },
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{ "snapshot", 0, 0, 's' },
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{ "verbose", 0, 0, 'v' },
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{ NULL, 0, 0, 0 }
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char *end; |
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bool snapshot = false; |
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int partition = -1; |
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int fd; |
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int ret; |
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while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
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switch (ch) {
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if (partition < 1 || partition > 8) |
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errx(EINVAL, "Invalid partition %d", partition); |
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break; |
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case 'k': |
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socket = optarg; |
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if (socket[0] != '/') |
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errx(EINVAL, "socket path must be absolute\n"); |
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break; |
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case 'd': |
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disconnect = true; |
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break; |
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case 'c': |
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device = optarg; |
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break; |
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case 'v': |
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verbose = 1; |
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break; |
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argv[0]); |
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} |
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if (disconnect) {
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fd = open(argv[optind], O_RDWR); |
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if (fd == -1) |
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errx(errno, "Cannot open %s", argv[optind]); |
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nbd_disconnect(fd); |
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close(fd); |
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printf("%s disconnected\n", argv[optind]);
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return 0; |
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} |
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bdrv_init(); |
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bs = bdrv_new("hda");
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find_partition(bs, partition, &dev_offset, &fd_size)) |
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errx(errno, "Could not find partition %d", partition); |
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sock = tcp_socket_incoming(bindto, port); |
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if (device) {
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pid_t pid; |
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if (!verbose) |
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daemon(0, 0); /* detach client and server */ |
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if (socket == NULL) {
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sprintf(sockpath, SOCKET_PATH, basename(device)); |
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socket = sockpath; |
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} |
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pid = fork(); |
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if (pid < 0) |
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return 1; |
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if (pid != 0) {
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off_t size; |
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size_t blocksize; |
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ret = 0; |
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bdrv_close(bs); |
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do {
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sock = unix_socket_outgoing(socket); |
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if (sock == -1) {
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if (errno != ENOENT && errno != ECONNREFUSED) |
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goto out; |
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sleep(1); /* wait children */ |
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} |
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} while (sock == -1); |
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fd = open(device, O_RDWR); |
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if (fd == -1) {
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ret = 1; |
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goto out; |
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} |
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ret = nbd_receive_negotiate(sock, &size, &blocksize); |
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if (ret == -1) {
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ret = 1; |
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goto out; |
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} |
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ret = nbd_init(fd, sock, size, blocksize); |
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if (ret == -1) {
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ret = 1; |
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goto out; |
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} |
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printf("NBD device %s is now connected to file %s\n",
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device, argv[optind]); |
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/* update partition table */ |
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show_parts(device); |
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nbd_client(fd, sock); |
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close(fd); |
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out: |
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kill(pid, SIGTERM); |
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unlink(socket); |
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return ret; |
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} |
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/* children */ |
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} |
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if (socket) {
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sock = unix_socket_incoming(socket); |
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} else {
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sock = tcp_socket_incoming(bindto, port); |
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} |
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|
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if (sock == -1) |
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return 1; |
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|
| ... | ... | |
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close(csock); |
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close(sock); |
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bdrv_close(bs); |
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if (socket) |
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unlink(socket); |
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return 0; |
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} |
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