#include <sys/mman.h>
#include <errno.h>
#include <getopt.h>
+#include <stdarg.h>
#ifndef __GNUC__
#error I need GCC to work
return 0;
}
-int opennet(char *name, int port, int sdp) {
+int opennet(char *name, char* portstr, int sdp) {
int sock;
- char portstr[6];
struct addrinfo hints;
struct addrinfo *ai = NULL;
struct addrinfo *rp = NULL;
int e;
- snprintf(portstr, sizeof(portstr), "%d", port);
-
memset(&hints,'\0',sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
return sock;
}
-void negotiate(int sock, u64 *rsize64, u32 *flags) {
+void negotiate(int sock, u64 *rsize64, u32 *flags, char* name) {
u64 magic, size64;
+ uint16_t tmp;
char buf[256] = "\0\0\0\0\0\0\0\0\0";
printf("Negotiation: ");
if (magic != cliserv_magic)
err("Not enough cliserv_magic");
printf(".");
+ if(name) {
+ uint32_t opt;
+ uint64_t namesize;
+ uint64_t reserved = 0;
+
+ if(read(sock, &tmp, sizeof(uint16_t)) < 0) {
+ err("Failed reading flags: %m");
+ }
+ *flags = ((u32)ntohs(tmp)) << 16;
+
+ /* reserved for future use*/
+ write(sock, &reserved, sizeof(reserved));
+
+ /* Write the export name that we're after */
+ magic = ntohll(cliserv_magic);
+ write(sock, &magic, sizeof(magic));
+ opt = ntohl(NBD_OPT_EXPORT_NAME);
+ write(sock, &opt, sizeof(opt));
+ namesize = (u64)strlen(name);
+ namesize = ntohll(namesize);
+ write(sock, &namesize, sizeof(namesize));
+ write(sock, name, strlen(name));
+ }
if (read(sock, &size64, sizeof(size64)) < 0)
err("Failed/3: %m\n");
printf("size = %lu", (unsigned long)(size64));
#endif
- if (read(sock, flags, sizeof(*flags)) < 0)
- err("Failed/4: %m\n");
- *flags = ntohl(*flags);
+ if(!name) {
+ if (read(sock, flags, sizeof(*flags)) < 0)
+ err("Failed/4: %m\n");
+ *flags = ntohl(*flags);
+ } else {
+ if(read(sock, &tmp, sizeof(tmp)) < 0)
+ err("Failed/4: %m\n");
+ *flags |= (uint32_t)ntohs(tmp);
+ }
if (read(sock, &buf, 124) < 0)
err("Failed/5: %m\n");
mlockall(MCL_CURRENT | MCL_FUTURE);
}
-void usage(void) {
- fprintf(stderr, "nbd-client version %s\n", PACKAGE_VERSION);
+void usage(char* errmsg, ...) {
+ if(errmsg) {
+ char tmp[256];
+ va_list ap;
+ va_start(ap, errmsg);
+ snprintf(tmp, 256, "ERROR: %s\n\n", errmsg);
+ vfprintf(stderr, errmsg, ap);
+ va_end(ap);
+ } else {
+ fprintf(stderr, "nbd-client version %s\n", PACKAGE_VERSION);
+ }
fprintf(stderr, "Usage: nbd-client host port nbd_device [-block-size|-b block size] [-timeout|-t timeout] [-swap|-s] [-sdp|-S] [-persist|-p] [-nofork|-n]\n");
fprintf(stderr, "Or : nbd-client -d nbd_device\n");
fprintf(stderr, "Or : nbd-client -c nbd_device\n");
}
int main(int argc, char *argv[]) {
- int port=0;
+ char* port=NULL;
int sock, nbd;
int blocksize=1024;
char *hostname=NULL;
u32 flags;
int c;
int nonspecial=0;
+ char* name=NULL;
struct option long_options[] = {
{ "block-size", required_argument, NULL, 'b' },
{ "check", required_argument, NULL, 'c' },
{ "disconnect", required_argument, NULL, 'd' },
{ "help", no_argument, NULL, 'h' },
+ { "name", required_argument, NULL, 'N' },
{ "nofork", no_argument, NULL, 'n' },
{ "persist", no_argument, NULL, 'p' },
{ "sdp", no_argument, NULL, 'S' },
logging();
- while((c=getopt_long_only(argc, argv, "-b:c:d:hnpSst:", long_options, NULL))>=0) {
+ while((c=getopt_long_only(argc, argv, "-b:c:d:hnN:pSst:", long_options, NULL))>=0) {
switch(c) {
case 1:
// non-option argument
optarg+=8;
goto timeout;
}
- fprintf(stderr, "ERROR: unknown option %s encountered\n", optarg);
+ usage("unknown option %s encountered", optarg);
exit(EXIT_FAILURE);
}
switch(nonspecial++) {
break;
case 1:
// port
- port = strtol(optarg, NULL, 0);
+ port = optarg;
+ if(!strtol(optarg, NULL, 0)) {
+ // not parseable as a number, assume it's the device and we have a name
+ nbddev = optarg;
+ nonspecial++;
+ } else {
+ if(name) {
+ usage("port and name specified at the same time. This is not supported.");
+ exit(EXIT_FAILURE);
+ }
+ }
break;
case 2:
// device
nbddev = optarg;
break;
default:
- fprintf(stderr, "ERROR: too many non-option arguments specified\n");
+ usage("too many non-option arguments specified");
exit(EXIT_FAILURE);
}
break;
disconnect(optarg);
exit(EXIT_SUCCESS);
case 'h':
- usage();
+ usage(NULL);
exit(EXIT_SUCCESS);
case 'n':
nofork=1;
break;
+ case 'N':
+ name=optarg;
+ if(port) {
+ usage("port and name specified at the same time. This is not supported.");
+ exit(EXIT_FAILURE);
+ }
+ port = NBD_DEFAULT_PORT;
+ break;
case 'p':
cont=1;
break;
}
}
- if(!port || !hostname || !nbddev) {
- usage();
+ if((!port && !name) || !hostname || !nbddev) {
+ usage("not enough information specified");
exit(EXIT_FAILURE);
}
sock = opennet(hostname, port, sdp);
- negotiate(sock, &size64, &flags);
+ negotiate(sock, &size64, &flags, name);
setsizes(nbd, size64, blocksize, flags);
set_timeout(nbd, timeout);
finish_sock(sock, nbd, swap);
close(sock); close(nbd);
sock = opennet(hostname, port, sdp);
nbd = open(nbddev, O_RDWR);
- negotiate(sock, &new_size, &new_flags);
+ negotiate(sock, &new_size, &new_flags, name);
if (size64 != new_size) {
err("Size of the device changed. Bye");
}
projects / nbd.git / blobdiff