* Version 1.0 - 64bit issues should be fixed, now
* Version 1.1 - added bs (blocksize) option (Alexey Guzeev, aga@permonline.ru)
* Version 1.2 - I added new option '-d' to send the disconnect request
+ * Version 2.0 - Version synchronised with server
+ * Version 2.1 - Check for disconnection before INIT_PASSWD is received
+ * to make errormsg a bit more helpful in case the server can't
+ * open the exported file.
+ * 16/03/2010 - Add IPv6 support.
+ * Kitt Tientanopajai <kitt@kitty.in.th>
+ * Neutron Soutmun <neo.neutron@gmail.com>
+ * Suriya Soutmun <darksolar@gmail.com>
*/
-#include <asm/page.h>
+#include "config.h"
+#include "lfs.h"
+
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include <netinet/tcp.h>
-#include <netinet/in.h> /* sockaddr_in, htons, in_addr */
-#include <netdb.h> /* hostent, gethostby*, getservby* */
+#include <netinet/in.h>
+#include <netdb.h>
#include <stdio.h>
#include <fcntl.h>
#include <syslog.h>
#include <stdlib.h>
+#include <sys/mount.h>
+#include <sys/mman.h>
+#include <errno.h>
-#define MY_NAME "nbd_client"
#ifndef __GNUC__
#error I need GCC to work
#endif
#include <linux/ioctl.h>
+#define MY_NAME "nbd_client"
#include "cliserv.h"
-int opennet(char *name, int port)
-{
- int sock;
- struct sockaddr_in xaddrin;
- int xaddrinlen = sizeof(xaddrin);
- struct hostent *hostn;
+int check_conn(char* devname, int do_print) {
+ char buf[256];
+ char* p;
+ int fd;
+ int len;
+ if(!strncmp(devname, "/dev/", 5)) {
+ devname+=5;
+ }
+ if((p=strchr(devname, 'p'))) {
+ /* We can't do checks on partitions. */
+ *p='\0';
+ }
+ snprintf(buf, 256, "/sys/block/%s/pid", devname);
+ if((fd=open(buf, O_RDONLY))<0) {
+ if(errno==ENOENT) {
+ return 1;
+ } else {
+ return 2;
+ }
+ }
+ len=read(fd, buf, 256);
+ buf[len-1]='\0';
+ if(do_print) printf("%s\n", buf);
+ return 0;
+}
- hostn = gethostbyname(name);
- if (!hostn)
- err("Gethostname failed: %h\n");
+int opennet(char *name, int port, int sdp) {
+ int sock;
+ char portstr[6];
+ struct addrinfo hints;
+ struct addrinfo *ai = NULL;
+ struct addrinfo *rp = NULL;
+ int e;
- if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
- err("Socket failed: %m");
+ snprintf(portstr, sizeof(portstr), "%d", port);
- xaddrin.sin_family = AF_INET;
- xaddrin.sin_port = htons(port);
- xaddrin.sin_addr.s_addr = *((int *) hostn->h_addr);
- if ((connect(sock, (struct sockaddr *) &xaddrin, xaddrinlen) < 0))
- err("Connect: %m");
+ memset(&hints,'\0',sizeof(hints));
+ hints.ai_family = AF_UNSPEC;
+ hints.ai_socktype = SOCK_STREAM;
+ hints.ai_flags = AI_ADDRCONFIG | AI_NUMERICSERV;
+ hints.ai_protocol = IPPROTO_TCP;
- setmysockopt(sock);
- return sock;
-}
+ e = getaddrinfo(name, portstr, &hints, &ai);
-int main(int argc, char *argv[])
-{
- int port, sock, nbd, one = 1;
- u64 magic, size64;
- unsigned long size;
- char buf[256] = "\0\0\0\0\0\0\0\0\0";
- int blocksize=1024;
- char *hostname;
- int swap=0;
-
- logging();
-
- if (argc < 3) {
- errmsg:
- fprintf(stderr, "Usage: nbd-client [bs=blocksize] host port nbd_device [-swap]\n");
- fprintf(stderr, "Or : nbd-client -d nbd_device\n");
- fprintf(stderr, "Default value for blocksize is 1024 (recommended for ethernet)\n");
- fprintf(stderr, "Allowed values for blocksize are 512,1024,2048,4096\n"); /* will be checked in kernel :) */
- fprintf(stderr, "Note, that kernel 2.4.2 and older ones do not work correctly with\n");
- fprintf(stderr, "blocksizes other than 1024 without patches\n");
- return 1;
+ if(e != 0) {
+ fprintf(stderr, "getaddrinfo failed: %s\n", gai_strerror(e));
+ freeaddrinfo(ai);
+ exit(EXIT_FAILURE);
}
- ++argv; --argc; /* skip programname */
-
- if (strcmp(argv[0], "-d")==0) {
- nbd = open(argv[1], O_RDWR);
- if (nbd < 0)
- err("Can not open NBD: %m");
- printf("Disconnecting: que, ");
- if (ioctl(nbd, NBD_CLEAR_QUE)< 0)
- err("Ioctl failed: %m\n");
- printf("disconnect, ");
-#ifdef NBD_DISCONNECT
- if (ioctl(nbd, NBD_DISCONNECT)<0)
- err("Ioctl failed: %m\n");
- printf("sock, ");
+ if(sdp) {
+#ifdef WITH_SDP
+ if (ai->ai_family == AF_INET)
+ ai->ai_family = AF_INET_SDP;
+ else (ai->ai_family == AF_INET6)
+ ai->ai_family = AF_INET6_SDP;
#else
- fprintf(stderr, "Can't disconnect: I was not compiled with disconnect support!\n" );
- exit(1);
+ err("Can't do SDP: I was not compiled with SDP support!");
#endif
- if (ioctl(nbd, NBD_CLEAR_SOCK)<0)
- err("Ioctl failed: %m\n");
- printf("done\n");
- return 0;
}
- if (strncmp(argv[0], "bs=", 3)==0) {
- blocksize=atoi(argv[0]+3);
- ++argv; --argc; /* skip blocksize */
+ for(rp = ai; rp != NULL; rp = rp->ai_next) {
+ sock = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
+
+ if(sock == -1)
+ continue; /* error */
+
+ if(connect(sock, rp->ai_addr, rp->ai_addrlen) != -1)
+ break; /* success */
}
- if (argc==0) goto errmsg;
- hostname=argv[0];
- ++argv; --argc; /* skip hostname */
+ if (rp == NULL)
+ err("Socket failed: %m");
- if (argc==0) goto errmsg;
- port = atoi(argv[0]);
- ++argv; --argc; /* skip port */
+ setmysockopt(sock);
- if (argc==0) goto errmsg;
- sock = opennet(hostname, port);
- nbd = open(argv[0], O_RDWR);
- if (nbd < 0)
- err("Can not open NBD: %m");
- ++argv; --argc; /* skip device */
+ freeaddrinfo(ai);
+ return sock;
+}
- if (argc>1) goto errmsg;
- if (argc!=0) swap=1;
- argv=NULL; argc=0; /* don't use it later suddenly */
+void negotiate(int sock, u64 *rsize64, u32 *flags) {
+ u64 magic, size64;
+ char buf[256] = "\0\0\0\0\0\0\0\0\0";
printf("Negotiation: ");
if (read(sock, buf, 8) < 0)
err("Failed/1: %m");
+ if (strlen(buf)==0)
+ err("Server closed connection");
if (strcmp(buf, INIT_PASSWD))
err("INIT_PASSWD bad");
printf(".");
printf("size = %lu", (unsigned long)(size64));
#endif
- if (read(sock, &buf, 128) < 0)
+ if (read(sock, flags, sizeof(*flags)) < 0)
err("Failed/4: %m\n");
+ *flags = ntohl(*flags);
+
+ if (read(sock, &buf, 124) < 0)
+ err("Failed/5: %m\n");
printf("\n");
+ *rsize64 = size64;
+}
+
+void setsizes(int nbd, u64 size64, int blocksize, u32 flags) {
+ unsigned long size;
+ int read_only = (flags & NBD_FLAG_READ_ONLY) ? 1 : 0;
+
#ifdef NBD_SET_SIZE_BLOCKS
if (size64/blocksize > (~0UL >> 1))
err("Device too large.\n");
size = (unsigned long)(size64/blocksize);
if ((er = ioctl(nbd, NBD_SET_SIZE_BLOCKS, size)) < 0)
err("Ioctl/1.1b failed: %m\n");
-fprintf(stderr, "bs=%d, sz=%lu\n", blocksize, size);
+ fprintf(stderr, "bs=%d, sz=%lu\n", blocksize, size);
}
#else
if (size64 > (~0UL >> 1)) {
} else {
size = (unsigned long)size64;
if (ioctl(nbd, NBD_SET_SIZE, size) < 0)
- err("Ioctl/1 failed: %m\n");
+ err("Ioctl NBD_SET_SIZE failed: %m\n");
}
#endif
ioctl(nbd, NBD_CLEAR_SOCK);
+
+ if (ioctl(nbd, BLKROSET, (unsigned long) &read_only) < 0)
+ err("Unable to set read-only attribute for device");
+}
+
+void set_timeout(int nbd, int timeout) {
+ if (timeout) {
+#ifdef NBD_SET_TIMEOUT
+ if (ioctl(nbd, NBD_SET_TIMEOUT, (unsigned long)timeout) < 0)
+ err("Ioctl NBD_SET_TIMEOUT failed: %m\n");
+ fprintf(stderr, "timeout=%d\n", timeout);
+#else
+ err("Ioctl NBD_SET_TIMEOUT cannot be called when compiled on a system that does not support it\n");
+#endif
+ }
+}
+
+void finish_sock(int sock, int nbd, int swap) {
if (ioctl(nbd, NBD_SET_SOCK, sock) < 0)
- err("Ioctl/2 failed: %m\n");
+ err("Ioctl NBD_SET_SOCK failed: %m\n");
-#ifndef SO_SWAPPING
if (swap)
- err("You have to compile me on machine with swapping patch enabled in order to use it later.");
+ mlockall(MCL_CURRENT | MCL_FUTURE);
+}
+
+int main(int argc, char *argv[]) {
+ int port, sock, nbd;
+ int blocksize=1024;
+ char *hostname, *nbddev;
+ int swap=0;
+ int cont=0;
+ int timeout=0;
+ int sdp=0;
+ int nofork=0;
+ u64 size64;
+ u32 flags;
+ int i;
+
+ logging();
+
+ if (argc < 3) {
+ errmsg:
+ fprintf(stderr, "nbd-client version %s\n", PACKAGE_VERSION);
+ fprintf(stderr, "Usage: nbd-client [bs=blocksize] [timeout=sec] host port nbd_device [-swap] [-persist] [-nofork]\n");
+ fprintf(stderr, "Or : nbd-client -d nbd_device\n");
+ fprintf(stderr, "Or : nbd-client -c nbd_device\n");
+ fprintf(stderr, "Default value for blocksize is 1024 (recommended for ethernet)\n");
+ fprintf(stderr, "Allowed values for blocksize are 512,1024,2048,4096\n"); /* will be checked in kernel :) */
+ fprintf(stderr, "Note, that kernel 2.4.2 and older ones do not work correctly with\n");
+ fprintf(stderr, "blocksizes other than 1024 without patches\n");
+ return 1;
+ }
+
+ ++argv; --argc; /* skip programname */
+
+ if (strcmp(argv[0], "-d")==0) {
+ nbd = open(argv[1], O_RDWR);
+ if (nbd < 0)
+ err("Cannot open NBD: %m\nPlease ensure the 'nbd' module is loaded.");
+ printf("Disconnecting: que, ");
+ if (ioctl(nbd, NBD_CLEAR_QUE)< 0)
+ err("Ioctl failed: %m\n");
+ printf("disconnect, ");
+#ifdef NBD_DISCONNECT
+ if (ioctl(nbd, NBD_DISCONNECT)<0)
+ err("Ioctl failed: %m\n");
+ printf("sock, ");
#else
- if (swap)
- if (setsockopt(sock, SOL_SOCKET, SO_SWAPPING, &one, sizeof(int)) < 0)
- err("Could not enable swapping: %m");
+ fprintf(stderr, "Can't disconnect: I was not compiled with disconnect support!\n" );
+ exit(1);
#endif
+ if (ioctl(nbd, NBD_CLEAR_SOCK)<0)
+ err("Ioctl failed: %m\n");
+ printf("done\n");
+ return 0;
+ }
+ if(strcmp(argv[0], "-c")==0) {
+ return check_conn(argv[1], 1);
+ }
+
+ if (strncmp(argv[0], "bs=", 3)==0) {
+ blocksize=atoi(argv[0]+3);
+ ++argv; --argc; /* skip blocksize */
+ }
+
+ if (strncmp(argv[0], "timeout=", 8)==0) {
+ timeout=atoi(argv[0]+8);
+ ++argv; --argc; /* skip timeout */
+ }
+
+ if (argc==0) goto errmsg;
+ hostname=argv[0];
+ ++argv; --argc; /* skip hostname */
+
+ if (argc==0) goto errmsg;
+ port = atoi(argv[0]);
+ ++argv; --argc; /* skip port */
+
+ if (argc==0) goto errmsg;
+ nbddev = argv[0];
+ nbd = open(nbddev, O_RDWR);
+ if (nbd < 0)
+ err("Cannot open NBD: %m\nPlease ensure the 'nbd' module is loaded.");
+ ++argv; --argc; /* skip device */
+
+ if (argc>4) goto errmsg;
+ for(i=0; i<4; i++) {
+ if (argc) {
+ if(strncmp(argv[0], "-swap", 5)==0) {
+ swap=1;
+ ++argv;--argc;
+ }
+ }
+ if (argc) {
+ if(strncmp(argv[0], "-persist", 8)==0) {
+ cont=1;
+ ++argv;--argc;
+ }
+ }
+ if (argc) {
+ if(strncmp(argv[0], "-sdp", 4)==0) {
+ sdp=1;
+ ++argv;--argc;
+ }
+ }
+ if (argc) {
+ if(strncmp(argv[0], "-nofork", 7)==0) {
+ nofork=1;
+ ++argv;--argc;
+ }
+ }
+ }
+ if(argc) goto errmsg;
+ sock = opennet(hostname, port, sdp);
+ argv=NULL; argc=0; /* don't use it later suddenly */
+
+ negotiate(sock, &size64, &flags);
+ setsizes(nbd, size64, blocksize, flags);
+ set_timeout(nbd, timeout);
+ finish_sock(sock, nbd, swap);
/* Go daemon */
+
+#ifndef NOFORK
+ if(!nofork) daemon(0,0);
+ do {
+ if (fork()) {
+ /* Due to a race, the kernel NBD driver cannot
+ * call for a reread of the partition table
+ * in the handling of the NBD_DO_IT ioctl().
+ * Therefore, this is done in the first open()
+ * of the device. We therefore make sure that
+ * the device is opened at least once after the
+ * connection was made. This has to be done in a
+ * separate process, since the NBD_DO_IT ioctl()
+ * does not return until the NBD device has
+ * disconnected.
+ */
+ while(check_conn(nbddev, 0)) {
+ sleep(1);
+ }
+ open(nbddev, O_RDONLY);
+ exit(0);
+ }
+#endif
+
+ if (ioctl(nbd, NBD_DO_IT) < 0) {
+ fprintf(stderr, "Kernel call returned: %m");
+ if(errno==EBADR) {
+ /* The user probably did 'nbd-client -d' on us.
+ * quit */
+ cont=0;
+ } else {
+ if(cont) {
+ u64 new_size;
+ u32 new_flags;
- chdir("/");
- if (fork())
- exit(0);
+ fprintf(stderr, " Reconnecting\n");
+ close(sock); close(nbd);
+ sock = opennet(hostname, port, sdp);
+ nbd = open(nbddev, O_RDWR);
+ negotiate(sock, &new_size, &new_flags);
+ if (size64 != new_size) {
+ err("Size of the device changed. Bye");
+ }
+ setsizes(nbd, size64, blocksize,
+ new_flags);
- if (ioctl(nbd, NBD_DO_IT) < 0)
- fprintf(stderr, "Kernel call returned: %m");
- else
- fprintf(stderr, "Kernel call returned.");
+ set_timeout(nbd, timeout);
+ finish_sock(sock,nbd,swap);
+ }
+ }
+ } else {
+ /* We're on 2.4. It's not clearly defined what exactly
+ * happened at this point. Probably best to quit, now
+ */
+ fprintf(stderr, "Kernel call returned.");
+ cont=0;
+ }
+ } while(cont);
printf("Closing: que, ");
ioctl(nbd, NBD_CLEAR_QUE);
printf("sock, ");