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nbd-client.c
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/*
* Open connection for network block device
*
* Copyright 1997,1998 Pavel Machek, distribute under GPL
* Copyright (c) 2002 - 2011 Wouter Verhelst <[email protected]>
*
* Version 1.0 - 64bit issues should be fixed, now
* Version 1.1 - added bs (blocksize) option (Alexey Guzeev, [email protected])
* 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 <[email protected]>
* Neutron Soutmun <[email protected]>
* Suriya Soutmun <[email protected]>
*/
#include "config.h"
#include "lfs.h"
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/types.h>
#include <unistd.h>
#include <netinet/tcp.h>
#include <netinet/in.h>
#include <netdb.h>
#include "netdb-compat.h"
#include <inttypes.h>
#include <stdio.h>
#include <fcntl.h>
#include <syslog.h>
#include <stdlib.h>
#include <sys/mount.h>
#include <sys/mman.h>
#include <signal.h>
#include <errno.h>
#include <getopt.h>
#include <stdarg.h>
#include <stdbool.h>
#include <time.h>
#include <linux/ioctl.h>
#if HAVE_NETLINK
#include "nbd-netlink.h"
#include <netlink/netlink.h>
#include <netlink/genl/genl.h>
#include <netlink/genl/ctrl.h>
#endif
#define MY_NAME "nbd_client"
#include "cliserv.h"
#if HAVE_GNUTLS && !defined(NOTLS)
#include "crypto-gnutls.h"
#endif
#ifdef WITH_SDP
#include <sdp_inet.h>
#endif
#define NBDC_DO_LIST 1
#if HAVE_NETLINK
static int callback(struct nl_msg *msg, void *arg) {
struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
struct nlattr *msg_attr[NBD_ATTR_MAX + 1];
int ret;
uint32_t index;
ret = nla_parse(msg_attr, NBD_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
genlmsg_attrlen(gnlh, 0), NULL);
if (ret)
err("Invalid response from the kernel\n");
if (!msg_attr[NBD_ATTR_INDEX])
err("Did not receive index from the kernel\n");
index = nla_get_u32(msg_attr[NBD_ATTR_INDEX]);
printf("Connected /dev/nbd%d\n", (int)index);
return NL_OK;
}
static struct nl_sock *get_nbd_socket(int *driver_id) {
struct nl_sock *socket;
socket = nl_socket_alloc();
if (!socket)
err("Couldn't allocate netlink socket\n");
if (genl_connect(socket))
err("Couldn't connect to the generic netlink socket\n");
*driver_id = genl_ctrl_resolve(socket, "nbd");
if (*driver_id < 0)
err("Couldn't resolve the nbd netlink family, make sure the nbd module is loaded and your nbd driver supports the netlink interface.\n");
return socket;
}
static void netlink_configure(int index, int *sockfds, int num_connects,
u64 size64, int blocksize, uint16_t flags,
int timeout) {
struct nl_sock *socket;
struct nlattr *sock_attr;
struct nl_msg *msg;
int driver_id, i;
socket = get_nbd_socket(&driver_id);
nl_socket_modify_cb(socket, NL_CB_VALID, NL_CB_CUSTOM, callback, NULL);
msg = nlmsg_alloc();
if (!msg)
err("Couldn't allocate netlink message\n");
genlmsg_put(msg, NL_AUTO_PORT, NL_AUTO_SEQ, driver_id, 0, 0,
NBD_CMD_CONNECT, 0);
if (index >= 0)
NLA_PUT_U32(msg, NBD_ATTR_INDEX, index);
NLA_PUT_U64(msg, NBD_ATTR_SIZE_BYTES, size64);
NLA_PUT_U64(msg, NBD_ATTR_BLOCK_SIZE_BYTES, blocksize);
NLA_PUT_U64(msg, NBD_ATTR_SERVER_FLAGS, flags);
if (timeout)
NLA_PUT_U64(msg, NBD_ATTR_TIMEOUT, timeout);
sock_attr = nla_nest_start(msg, NBD_ATTR_SOCKETS);
if (!sock_attr)
err("Couldn't nest the sockets for our connection\n");
for (i = 0; i < num_connects; i++) {
struct nlattr *sock_opt;
sock_opt = nla_nest_start(msg, NBD_SOCK_ITEM);
if (!sock_opt)
err("Couldn't nest the sockets for our connection\n");
NLA_PUT_U32(msg, NBD_SOCK_FD, sockfds[i]);
nla_nest_end(msg, sock_opt);
}
nla_nest_end(msg, sock_attr);
if (nl_send_sync(socket, msg) < 0)
err("Failed to setup device, check dmesg\n");
return;
nla_put_failure:
err("Failed to create netlink message\n");
}
static void netlink_disconnect(char *nbddev) {
struct nl_sock *socket;
struct nl_msg *msg;
int driver_id;
int index = -1;
if (nbddev) {
if (sscanf(nbddev, "/dev/nbd%d", &index) != 1)
err("Invalid nbd device target\n");
}
if (index < 0)
err("Invalid nbd device target\n");
socket = get_nbd_socket(&driver_id);
msg = nlmsg_alloc();
if (!msg)
err("Couldn't allocate netlink message\n");
genlmsg_put(msg, NL_AUTO_PORT, NL_AUTO_SEQ, driver_id, 0, 0,
NBD_CMD_DISCONNECT, 0);
NLA_PUT_U32(msg, NBD_ATTR_INDEX, index);
if (nl_send_sync(socket, msg) < 0)
err("Failed to disconnect device, check dmsg\n");
nl_socket_free(socket);
return;
nla_put_failure:
err("Failed to create netlink message\n");
}
#else
static void netlink_configure(int index, int *sockfds, int num_connects,
u64 size64, int blocksize, uint16_t flags,
int timeout)
{
}
static void netlink_disconnect(char *nbddev)
{
}
#endif /* HAVE_NETLINK */
int check_conn(char* devname, int do_print) {
char buf[256];
char* p;
int fd;
int len;
if( (p=strrchr(devname, '/')) ) {
devname=p+1;
}
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);
if(len < 0) {
perror("could not read from server");
close(fd);
return 2;
}
buf[(len < 256) ? len : 255]='\0';
if(do_print) printf("%s\n", buf);
close(fd);
return 0;
}
int opennet(char *name, char* portstr, int sdp) {
int sock;
struct addrinfo hints;
struct addrinfo *ai = NULL;
struct addrinfo *rp = NULL;
int e;
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;
e = getaddrinfo(name, portstr, &hints, &ai);
if(e != 0) {
fprintf(stderr, "getaddrinfo failed: %s\n", gai_strerror(e));
freeaddrinfo(ai);
return -1;
}
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
err("Can't do SDP: I was not compiled with SDP support!");
#endif
}
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 */
close(sock);
}
if (rp == NULL) {
err_nonfatal("Socket failed: %m");
sock = -1;
goto err;
}
setmysockopt(sock);
err:
freeaddrinfo(ai);
return sock;
}
int openunix(const char *path) {
int sock;
struct sockaddr_un un_addr;
memset(&un_addr, 0, sizeof(un_addr));
un_addr.sun_family = AF_UNIX;
if (strnlen(path, sizeof(un_addr.sun_path)) == sizeof(un_addr.sun_path)) {
err_nonfatal("UNIX socket path too long");
return -1;
}
strncpy(un_addr.sun_path, path, sizeof(un_addr.sun_path) - 1);
if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
err_nonfatal("SOCKET failed");
return -1;
};
if (connect(sock, &un_addr, sizeof(un_addr)) == -1) {
err_nonfatal("CONNECT failed");
close(sock);
return -1;
}
return sock;
}
void send_request(int sock, uint32_t opt, ssize_t datasize, void* data) {
struct {
uint64_t magic;
uint32_t opt;
uint32_t datasize;
} __attribute__((packed)) header = {
ntohll(opts_magic),
ntohl(opt),
ntohl(datasize),
};
if(datasize < 0) {
datasize = strlen((char*)data);
header.datasize = htonl(datasize);
}
writeit(sock, &header, sizeof(header));
if(data != NULL) {
writeit(sock, data, datasize);
}
}
void send_info_request(int sock, uint32_t opt, int n_reqs, uint16_t* reqs, char* name) {
uint16_t rlen = htons(n_reqs);
uint32_t nlen = htonl(strlen(name));
send_request(sock, opt, sizeof(uint32_t) + strlen(name) + sizeof(uint16_t) + n_reqs * sizeof(uint16_t), NULL);
writeit(sock, &nlen, sizeof(nlen));
writeit(sock, name, strlen(name));
writeit(sock, &rlen, sizeof(rlen));
if(n_reqs > 0) {
writeit(sock, reqs, n_reqs * sizeof(uint16_t));
}
}
struct reply {
uint64_t magic;
uint32_t opt;
uint32_t reply_type;
uint32_t datasize;
char data[];
} __attribute__((packed));
struct reply* read_reply(int sock) {
struct reply *retval = malloc(sizeof(struct reply));
readit(sock, retval, sizeof(*retval));
retval->magic = ntohll(retval->magic);
retval->opt = ntohl(retval->opt);
retval->reply_type = ntohl(retval->reply_type);
retval->datasize = ntohl(retval->datasize);
if (retval->magic != rep_magic) {
fprintf(stderr, "E: received invalid negotiation magic %" PRIu64 " (expected %" PRIu64 ")", retval->magic, rep_magic);
exit(EXIT_FAILURE);
}
if (retval->datasize > 0) {
retval = realloc(retval, sizeof(struct reply) + retval->datasize);
readit(sock, &(retval->data), retval->datasize);
}
return retval;
}
void ask_list(int sock) {
uint32_t opt_server;
uint32_t len;
uint32_t lenn;
uint32_t reptype;
uint64_t magic;
int rlen;
const int BUF_SIZE = 1024;
char buf[BUF_SIZE];
send_request(sock, NBD_OPT_LIST, 0, NULL);
/* newline, move away from the "Negotiation:" line */
printf("\n");
do {
memset(buf, 0, 1024);
if(read(sock, &magic, sizeof(magic)) < 0) {
err("Reading magic from server: %m");
}
if(read(sock, &opt_server, sizeof(opt_server)) < 0) {
err("Reading option: %m");
}
if(read(sock, &reptype, sizeof(reptype)) <0) {
err("Reading reply from server: %m");
}
if(read(sock, &len, sizeof(len)) < 0) {
err("Reading length from server: %m");
}
magic=ntohll(magic);
len=ntohl(len);
reptype=ntohl(reptype);
if(magic != rep_magic) {
err("Not enough magic from server");
}
if(reptype & NBD_REP_FLAG_ERROR) {
switch(reptype) {
case NBD_REP_ERR_POLICY:
fprintf(stderr, "\nE: listing not allowed by server.\n");
break;
default:
fprintf(stderr, "\nE: unexpected error from server.\n");
break;
}
if(len > 0 && len < BUF_SIZE) {
if((rlen=read(sock, buf, len)) < 0) {
fprintf(stderr, "\nE: could not read error message from server\n");
} else {
buf[rlen] = '\0';
fprintf(stderr, "Server said: %s\n", buf);
}
}
exit(EXIT_FAILURE);
} else {
if(reptype != NBD_REP_ACK) {
if(reptype != NBD_REP_SERVER) {
err("Server sent us a reply we don't understand!");
}
if(read(sock, &lenn, sizeof(lenn)) < 0) {
fprintf(stderr, "\nE: could not read export name length from server\n");
exit(EXIT_FAILURE);
}
lenn=ntohl(lenn);
if (lenn >= BUF_SIZE) {
fprintf(stderr, "\nE: export name on server too long\n");
exit(EXIT_FAILURE);
}
if(read(sock, buf, lenn) < 0) {
fprintf(stderr, "\nE: could not read export name from server\n");
exit(EXIT_FAILURE);
}
buf[lenn] = 0;
printf("%s", buf);
len -= lenn;
len -= sizeof(lenn);
if(len > 0) {
if(read(sock, buf, len) < 0) {
fprintf(stderr, "\nE: could not read export description from server\n");
exit(EXIT_FAILURE);
}
buf[len] = 0;
printf(": %s\n", buf);
} else {
printf("\n");
}
}
}
} while(reptype != NBD_REP_ACK);
send_request(sock, NBD_OPT_ABORT, 0, NULL);
}
void parse_sizes(char *buf, uint64_t *size, uint16_t *flags) {
memcpy(size, buf, sizeof(*size));
*size = ntohll(*size);
buf += sizeof(*size);
memcpy(flags, buf, sizeof(*flags));
*flags = ntohs(*flags);
if ((*size>>12) > (uint64_t)~0UL) {
printf("size = %luMB", (unsigned long)(*size>>20));
err("Exported device is too big for me. Get 64-bit machine :-(\n");
} else {
printf("size = %luMB", (unsigned long)(*size>>20));
}
printf("\n");
}
void send_opt_exportname(int sock, u64 *rsize64, uint16_t *flags, bool can_opt_go, char* name, uint16_t global_flags) {
send_request(sock, NBD_OPT_EXPORT_NAME, -1, name);
char b[sizeof(*flags) + sizeof(*rsize64)];
if(readit(sock, b, sizeof(b)) < 0 && can_opt_go) {
err("E: server does not support NBD_OPT_GO and dropped connection after sending NBD_OPT_EXPORT_NAME. Try -g.");
}
parse_sizes(b, rsize64, flags);
if(!global_flags & NBD_FLAG_NO_ZEROES) {
char buf[125];
readit(sock, buf, 124);
}
}
void negotiate(int *sockp, u64 *rsize64, uint16_t *flags, char* name, uint32_t needed_flags, uint32_t client_flags, uint32_t do_opts, char *certfile, char *keyfile, char *cacertfile, char *tlshostname, bool tls, bool can_opt_go) {
u64 magic;
uint16_t tmp;
uint16_t global_flags;
char buf[256] = "\0\0\0\0\0\0\0\0\0";
int sock = *sockp;
printf("Negotiation: ");
readit(sock, buf, 8);
if (strcmp(buf, INIT_PASSWD))
err("INIT_PASSWD bad");
printf(".");
readit(sock, &magic, sizeof(magic));
magic = ntohll(magic);
if (magic != opts_magic) {
if(magic == cliserv_magic) {
err("It looks like you're trying to connect to an oldstyle server. This is no longer supported since nbd 3.10.");
}
}
printf(".");
readit(sock, &tmp, sizeof(uint16_t));
global_flags = ntohs(tmp);
if((needed_flags & global_flags) != needed_flags) {
/* There's currently really only one reason why this
* check could possibly fail, but we may need to change
* this error message in the future... */
fprintf(stderr, "\nE: Server does not support listing exports\n");
exit(EXIT_FAILURE);
}
if (global_flags & NBD_FLAG_NO_ZEROES) {
client_flags |= NBD_FLAG_C_NO_ZEROES;
}
client_flags = htonl(client_flags);
if (write(sock, &client_flags, sizeof(client_flags)) < 0)
err("Failed/2.1: %m");
#if HAVE_GNUTLS && !defined(NOTLS)
/* TLS */
if (tls) {
int plainfd[2]; // [0] is used by the proxy, [1] is used by NBD
tlssession_t *s = NULL;
int ret;
uint32_t tmp32;
uint64_t tmp64;
send_request(sock, NBD_OPT_STARTTLS, 0, NULL);
if (read(sock, &tmp64, sizeof(tmp64)) < 0)
err("Could not read cliserv_magic: %m");
tmp64 = ntohll(tmp64);
if (tmp64 != NBD_OPT_REPLY_MAGIC) {
err("reply magic does not match");
}
if (read(sock, &tmp32, sizeof(tmp32)) < 0)
err("Could not read option type: %m");
tmp32 = ntohl(tmp32);
if (tmp32 != NBD_OPT_STARTTLS)
err("Reply to wrong option");
if (read(sock, &tmp32, sizeof(tmp32)) < 0)
err("Could not read option reply type: %m");
tmp32 = ntohl(tmp32);
if (tmp32 != NBD_REP_ACK) {
err("Option reply type != NBD_REP_ACK");
}
if (read(sock, &tmp32, sizeof(tmp32)) < 0) err(
"Could not read option data length: %m");
tmp32 = ntohl(tmp32);
if (tmp32 != 0) {
err("Option reply data length != 0");
}
s = tlssession_new(0,
keyfile,
certfile,
cacertfile,
tlshostname,
!cacertfile || !tlshostname, // insecure flag
#ifdef DODBG
1, // debug
#else
0, // debug
#endif
NULL, // quitfn
NULL, // erroutfn
NULL // opaque
);
if (!s)
err("Cannot establish TLS session");
if (socketpair(AF_UNIX, SOCK_STREAM, 0, plainfd) < 0)
err("Cannot get socket pair");
if (set_nonblocking(plainfd[0], 0) <0 ||
set_nonblocking(plainfd[1], 0) <0 ||
set_nonblocking(sock, 0) <0) {
close(plainfd[0]);
close(plainfd[1]);
err("Cannot set socket options");
}
ret = fork();
if (ret < 0)
err("Could not fork");
else if (ret == 0) {
// we are the child
if (daemon(0, 0) < 0) {
/* no one will see this */
fprintf(stderr, "Can't detach from the terminal");
exit(1);
}
signal (SIGPIPE, SIG_IGN);
close(plainfd[1]);
tlssession_mainloop(sock, plainfd[0], s);
close(sock);
close(plainfd[0]);
exit(0);
}
close(plainfd[0]);
close(sock);
sock = plainfd[1]; /* use the decrypted FD from now on */
*sockp = sock;
}
#else
if (keyfile) {
err("TLS requested but support not compiled in");
}
#endif
if(do_opts & NBDC_DO_LIST) {
ask_list(sock);
exit(EXIT_SUCCESS);
}
struct reply *rep = NULL;
if(!can_opt_go) {
send_opt_exportname(sock, rsize64, flags, can_opt_go, name, global_flags);
return;
}
send_info_request(sock, NBD_OPT_GO, 0, NULL, name);
do {
if(rep != NULL) free(rep);
rep = read_reply(sock);
if(rep && (rep->reply_type & NBD_REP_FLAG_ERROR)) {
switch(rep->reply_type) {
case NBD_REP_ERR_UNSUP:
/* server doesn't support NBD_OPT_GO or NBD_OPT_INFO,
* fall back to NBD_OPT_EXPORT_NAME */
send_opt_exportname(sock, rsize64, flags, can_opt_go, name, global_flags);
free(rep);
return;
case NBD_REP_ERR_POLICY:
if(rep->datasize > 0) {
char errstr[1024];
snprintf(errstr, sizeof errstr, "Connection not allowed by server policy. Server said: %s", rep->data);
err(errstr);
} else {
err("Connection not allowed by server policy.");
}
free(rep);
exit(EXIT_FAILURE);
default:
if(rep->datasize > 0) {
char errstr[1024];
snprintf(errstr, sizeof errstr, "Unknown error returned by server. Server said: %s", rep->data);
err(errstr);
} else {
err("Unknown error returned by server.");
}
free(rep);
exit(EXIT_FAILURE);
}
}
uint16_t info_type;
switch(rep->reply_type) {
case NBD_REP_INFO:
memcpy(&info_type, rep->data, 2);
info_type = htons(info_type);
switch(info_type) {
case NBD_INFO_EXPORT:
parse_sizes(rep->data + 2, rsize64, flags);
break;
default:
// ignore these, don't need them
break;
}
break;
case NBD_REP_ACK:
break;
default:
err_nonfatal("Unknown reply to NBD_OPT_GO received, ignoring");
}
} while(rep->reply_type != NBD_REP_ACK);
free(rep);
}
bool get_from_config(char* cfgname, char** name_ptr, char** dev_ptr, char** hostn_ptr, int* bs, int* timeout, int* persist, int* swap, int* sdp, int* b_unix, char**port, int* num_conns, char **certfile, char **keyfile, char **cacertfile, char **tlshostname, bool *can_opt_go) {
int fd = open(SYSCONFDIR "/nbdtab", O_RDONLY);
bool retval = false;
if(fd < 0) {
fprintf(stderr, "while opening %s: ", SYSCONFDIR "/nbdtab");
perror("could not open config file");
goto out;
}
off_t size = lseek(fd, 0, SEEK_END);
lseek(fd, 0, SEEK_SET);
void *data = NULL;
char *fsep = "\n\t# ";
char *lsep = "\n#";
if(size < 0) {
perror("E: mmap'ing nbdtab");
exit(EXIT_FAILURE);
}
data = mmap(NULL, (size_t)size, PROT_READ, MAP_SHARED, fd, 0);
if(!strncmp(cfgname, "/dev/", 5)) {
cfgname += 5;
}
char *loc = strstr((const char*)data, cfgname);
if(!loc) {
goto out;
}
size_t l = strlen(cfgname) + 6;
*dev_ptr = malloc(l);
snprintf(*dev_ptr, l, "/dev/%s", cfgname);
size_t line_len, field_len, ws_len;
#define CHECK_LEN field_len = strcspn(loc, fsep); ws_len = strspn(loc+field_len, fsep); if(field_len > line_len || line_len <= 0) { goto out; }
#define MOVE_NEXT line_len -= field_len + ws_len; loc += field_len + ws_len
// find length of line
line_len = strcspn(loc, lsep);
// first field is the device node name, which we already know, so skip it
CHECK_LEN;
MOVE_NEXT;
// next field is the hostname
CHECK_LEN;
*hostn_ptr = strndup(loc, field_len);
MOVE_NEXT;
// third field is the export name
CHECK_LEN;
*name_ptr = strndup(loc, field_len);
if(ws_len + field_len > line_len) {
// optional last field is not there, so return success
retval = true;
goto out;
}
MOVE_NEXT;
CHECK_LEN;
#undef CHECK_LEN
#undef MOVE_NEXT
// fourth field is the options field, a comma-separated field of options
do {
if(!strncmp(loc, "conns=", 6)) {
*num_conns = (int)strtol(loc+6, &loc, 0);
goto next;
}
if(!strncmp(loc, "bs=", 3)) {
*bs = (int)strtol(loc+3, &loc, 0);
goto next;
}
if(!strncmp(loc, "timeout=", 8)) {
*timeout = (int)strtol(loc+8, &loc, 0);
goto next;
}
if(!strncmp(loc, "port=", 5)) {
*port = strndup(loc+5, strcspn(loc+5, ","));
goto next;
}
if(!strncmp(loc, "persist", 7)) {
loc += 7;
*persist = 1;
goto next;
}
if(!strncmp(loc, "swap", 4)) {
*swap = 1;
loc += 4;
goto next;
}
if(!strncmp(loc, "sdp", 3)) {
*sdp = 1;
loc += 3;
goto next;
}
if(!strncmp(loc, "unix", 4)) {
*b_unix = 1;
loc += 4;
goto next;
}
if(!strncmp(loc, "certfile=", 9)) {
*certfile = strndup(loc+9, strcspn(loc+9, ","));
goto next;
}
if(!strncmp(loc, "keyfile=", 8)) {
*keyfile = strndup(loc+8, strcspn(loc+8, ","));
goto next;
}
if(!strncmp(loc, "cacertfile=", 11)) {
*cacertfile = strndup(loc+11, strcspn(loc+11, ","));
goto next;
}
if(!strncmp(loc, "tlshostname=", 9)) {
*tlshostname = strndup(loc+9, strcspn(loc+9, ","));
goto next;
}
if(!strncmp(loc, "no_optgo", 8)) {
*can_opt_go = false;
goto next;
}
// skip unknown options, with a warning unless they start with a '_'
l = strcspn(loc, ",");
if(*loc != '_') {
char* s = strndup(loc, l);
fprintf(stderr, "Warning: unknown option '%s' found in nbdtab file", s);
free(s);
}
loc += l;
next:
if(*loc == ',') {
loc++;
}
} while(strcspn(loc, lsep) > 0);
retval = true;
out:
if(data != NULL) {
munmap(data, size);
}
if(fd >= 0) {
close(fd);
}
return retval;
}
void setsizes(int nbd, u64 size64, int blocksize, u32 flags) {
unsigned long size;
int read_only = (flags & NBD_FLAG_READ_ONLY) ? 1 : 0;
if (size64>>12 > (uint64_t)~0UL)
err("Device too large.\n");
else {
int tmp_blocksize = 4096;
if (size64 / (u64)blocksize <= (uint64_t)~0UL)
tmp_blocksize = blocksize;
if (ioctl(nbd, NBD_SET_BLKSIZE, tmp_blocksize) < 0) {
fprintf(stderr, "Failed to set blocksize %d\n",
tmp_blocksize);
err("Ioctl/1.1a failed: %m\n");
}
size = (unsigned long)(size64 / (u64)tmp_blocksize);
if (ioctl(nbd, NBD_SET_SIZE_BLOCKS, size) < 0)
err("Ioctl/1.1b failed: %m\n");
if (tmp_blocksize != blocksize) {
if (ioctl(nbd, NBD_SET_BLKSIZE, (unsigned long)blocksize) < 0) {
fprintf(stderr, "Failed to set blocksize %d\n",
blocksize);
err("Ioctl/1.1c failed: %m\n");
}
}
fprintf(stderr, "bs=%d, sz=%" PRIu64 " bytes\n", blocksize, (u64)tmp_blocksize * size);
}
ioctl(nbd, NBD_CLEAR_SOCK);
/* ignore error as kernel may not support */
ioctl(nbd, NBD_SET_FLAGS, (unsigned long) flags);
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) {
if (ioctl(nbd, NBD_SET_TIMEOUT, (unsigned long)timeout) < 0)
err("Ioctl NBD_SET_TIMEOUT failed: %m\n");
fprintf(stderr, "timeout=%d\n", timeout);
}
}
void finish_sock(int sock, int nbd, int swap) {
if (ioctl(nbd, NBD_SET_SOCK, sock) < 0) {
if (errno == EBUSY)
err("Kernel doesn't support multiple connections\n");
else
err("Ioctl NBD_SET_SOCK failed: %m\n");
}
#ifndef __ANDROID__
if (swap)
mlockall(MCL_CURRENT | MCL_FUTURE);
#endif
}
static int
oom_adjust(const char *file, const char *value)
{
int fd, rc;
size_t len;
fd = open(file, O_WRONLY);
if (fd < 0)
return -1;
len = strlen(value);
rc = write(fd, value, len) != (ssize_t) len;
close(fd);
return rc ? -1 : 0;
}
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, tmp, ap);
va_end(ap);
} else {
fprintf(stderr, "%s version %s\n", PROG_NAME, PACKAGE_VERSION);
}
#if HAVE_NETLINK
fprintf(stderr, "Usage: nbd-client -name|-N name host [port] nbd_device\n\t[-block-size|-b block size] [-timeout|-t timeout] [-swap|-s] [-sdp|-S]\n\t[-persist|-p] [-nofork|-n] [-systemd-mark|-m] [-nonetlink|-L]\n");
#else
fprintf(stderr, "Usage: nbd-client -name|-N name host [port] nbd_device\n\t[-block-size|-b block size] [-timeout|-t timeout] [-swap|-s] [-sdp|-S]\n\t[-persist|-p] [-nofork|-n] [-systemd-mark|-m]\n");
#endif
fprintf(stderr, "Or : nbd-client -u (with same arguments as above)\n");
fprintf(stderr, "Or : nbd-client nbdX\n");
fprintf(stderr, "Or : nbd-client -d nbd_device\n");
fprintf(stderr, "Or : nbd-client -c nbd_device\n");
fprintf(stderr, "Or : nbd-client -h|--help\n");
fprintf(stderr, "Or : nbd-client -l|--list host\n");
fprintf(stderr, "Or : nbd-client -V|--version\n");
#if HAVE_GNUTLS && !defined(NOTLS)
fprintf(stderr, "All commands that connect to a host also take:\n\t[-F|-certfile certfile] [-K|-keyfile keyfile]\n\t[-A|-cacertfile cacertfile] [-H|-tlshostname hostname] [-x|-enable-tls]\n");
#endif
fprintf(stderr, "Default value for blocksize is 512\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");
fprintf(stderr, "Default value for port is 10809. Note that port must always be numeric\n");
fprintf(stderr, "Bug reports and general discussion should go to %s\n", PACKAGE_BUGREPORT);
}
void disconnect(char* device) {
int nbd = open(device, O_RDWR);
if (nbd < 0)
err("Cannot open NBD: %m\nPlease ensure the 'nbd' module is loaded.");
printf("disconnect, ");
if (ioctl(nbd, NBD_DISCONNECT)<0)
err("Ioctl failed: %m\n");
printf("sock, ");
if (ioctl(nbd, NBD_CLEAR_SOCK)<0)
err("Ioctl failed: %m\n");
printf("done\n");
}
#if HAVE_NETLINK
static const char *short_opts = "-A:b:c:C:d:H:hK:LlnN:pSst:uVx";
#else
static const char *short_opts = "-A:b:c:C:d:gH:hK:lnN:pSst:uVx";
#endif
int main(int argc, char *argv[]) {
char* port=NBD_DEFAULT_PORT;
int sock, nbd;
int blocksize=512;
char *hostname=NULL;
char *nbddev=NULL;
int swap=0;
int cont=0;
int timeout=0;
int sdp=0;
int G_GNUC_UNUSED nofork=0; // if -dNOFORK
pid_t main_pid;
u64 size64;
uint16_t flags = 0;
int c;
int nonspecial=0;
int b_unix=0;
char* name="";
uint16_t needed_flags=0;
uint32_t cflags=NBD_FLAG_C_FIXED_NEWSTYLE;
uint32_t opts=0;
sigset_t block, old;
char *certfile = NULL;
char *keyfile = NULL;
char *cacertfile = NULL;
char *tlshostname = NULL;
bool tls = false;
struct sigaction sa;
int num_connections = 1;
int netlink = HAVE_NETLINK;
int need_disconnect = 0;
int *sockfds;
struct option long_options[] = {
{ "cacertfile", required_argument, NULL, 'A' },
{ "block-size", required_argument, NULL, 'b' },
{ "check", required_argument, NULL, 'c' },
{ "connections", required_argument, NULL, 'C'},
{ "disconnect", required_argument, NULL, 'd' },
{ "certfile", required_argument, NULL, 'F' },
{ "no-optgo", no_argument, NULL, 'g' },
{ "help", no_argument, NULL, 'h' },
{ "tlshostname", required_argument, NULL, 'H' },
{ "keyfile", required_argument, NULL, 'K' },
{ "list", no_argument, NULL, 'l' },
#if HAVE_NETLINK
{ "nonetlink", no_argument, NULL, 'L' },
#endif
{ "systemd-mark", no_argument, NULL, 'm' },
{ "nofork", no_argument, NULL, 'n' },
{ "name", required_argument, NULL, 'N' },
{ "persist", no_argument, NULL, 'p' },
{ "sdp", no_argument, NULL, 'S' },
{ "swap", no_argument, NULL, 's' },
{ "timeout", required_argument, NULL, 't' },
{ "unix", no_argument, NULL, 'u' },
{ "version", no_argument, NULL, 'V' },
{ "enable-tls", no_argument, NULL, 'x' },
{ 0, 0, 0, 0 },
};
int i;