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authorNick Thomas <nick@bytemark.co.uk>2011-02-22 15:44:53 +0000
committerKevin Wolf <kwolf@redhat.com>2011-04-07 13:51:48 +0200
commitc12504ceef999c80b82c69c0154205ca23247fd5 (patch)
tree3702d59560a42ecf0a559e8ddb1543f52b1c767e
parentb82eac92ac69a22243d341dde0213b7d15d7ba24 (diff)
NBD: Use qemu_socket functions to open TCP and UNIX sockets
This commit has the side-effect of making the qemu-nbd binary capable of binding to IPv6 addresses. ("-b ::1", for instance). block/nbd.c fails to parse IPv6 IP addresses correctly at this point, but will work over IPv6 when given a hostname. It still works over IPv4 as before. We move the qemu-sockets object from the 'common' to the 'block' list in the Makefile. The common list includes the block list, so this is effectively a no-op for the rest of the code. We also add 32-bit 'magic' attributes to nbd_(request|reply) to facilitate calculating maximum request/response sizes later. Signed-off-by: Nick Thomas <nick@bytemark.co.uk> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
-rw-r--r--Makefile.objs4
-rw-r--r--nbd.c158
-rw-r--r--nbd.h9
3 files changed, 38 insertions, 133 deletions
diff --git a/Makefile.objs b/Makefile.objs
index 94587e1740..44ce368d05 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -14,7 +14,7 @@ oslib-obj-$(CONFIG_POSIX) += oslib-posix.o
# block-obj-y is code used by both qemu system emulation and qemu-img
block-obj-y = cutils.o cache-utils.o qemu-malloc.o qemu-option.o module.o async.o
-block-obj-y += nbd.o block.o aio.o aes.o qemu-config.o qemu-progress.o
+block-obj-y += nbd.o block.o aio.o aes.o qemu-config.o qemu-progress.o qemu-sockets.o
block-obj-$(CONFIG_POSIX) += posix-aio-compat.o
block-obj-$(CONFIG_LINUX_AIO) += linux-aio.o
@@ -94,7 +94,7 @@ common-obj-$(CONFIG_SSI_SD) += ssi-sd.o
common-obj-$(CONFIG_SD) += sd.o
common-obj-y += bt.o bt-host.o bt-vhci.o bt-l2cap.o bt-sdp.o bt-hci.o bt-hid.o usb-bt.o
common-obj-y += bt-hci-csr.o
-common-obj-y += buffered_file.o migration.o migration-tcp.o qemu-sockets.o
+common-obj-y += buffered_file.o migration.o migration-tcp.o
common-obj-y += qemu-char.o savevm.o #aio.o
common-obj-y += msmouse.o ps2.o
common-obj-y += qdev.o qdev-properties.o
diff --git a/nbd.c b/nbd.c
index abe0ecb17e..0dcd86b52f 100644
--- a/nbd.c
+++ b/nbd.c
@@ -107,155 +107,55 @@ size_t nbd_wr_sync(int fd, void *buffer, size_t size, bool do_read)
return offset;
}
-int tcp_socket_outgoing(const char *address, uint16_t port)
+static void combine_addr(char *buf, size_t len, const char* address,
+ uint16_t port)
{
- int s;
- struct in_addr in;
- struct sockaddr_in addr;
-
- s = socket(PF_INET, SOCK_STREAM, 0);
- if (s == -1) {
- return -1;
- }
-
- if (inet_aton(address, &in) == 0) {
- struct hostent *ent;
-
- ent = gethostbyname(address);
- if (ent == NULL) {
- goto error;
- }
-
- memcpy(&in, ent->h_addr, sizeof(in));
- }
-
- addr.sin_family = AF_INET;
- addr.sin_port = htons(port);
- memcpy(&addr.sin_addr.s_addr, &in, sizeof(in));
-
- if (connect(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
- goto error;
+ /* If the address-part contains a colon, it's an IPv6 IP so needs [] */
+ if (strstr(address, ":")) {
+ snprintf(buf, len, "[%s]:%u", address, port);
+ } else {
+ snprintf(buf, len, "%s:%u", address, port);
}
-
- return s;
-error:
- closesocket(s);
- return -1;
}
-int tcp_socket_incoming(const char *address, uint16_t port)
+int tcp_socket_outgoing(const char *address, uint16_t port)
{
- int s;
- struct in_addr in;
- struct sockaddr_in addr;
- int opt;
-
- s = socket(PF_INET, SOCK_STREAM, 0);
- if (s == -1) {
- return -1;
- }
-
- if (inet_aton(address, &in) == 0) {
- struct hostent *ent;
-
- ent = gethostbyname(address);
- if (ent == NULL) {
- goto error;
- }
-
- memcpy(&in, ent->h_addr, sizeof(in));
- }
-
- addr.sin_family = AF_INET;
- addr.sin_port = htons(port);
- memcpy(&addr.sin_addr.s_addr, &in, sizeof(in));
-
- opt = 1;
- if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
- (const void *) &opt, sizeof(opt)) == -1) {
- goto error;
- }
-
- if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
- goto error;
- }
-
- if (listen(s, 128) == -1) {
- goto error;
- }
-
- return s;
-error:
- closesocket(s);
- return -1;
+ char address_and_port[128];
+ combine_addr(address_and_port, 128, address, port);
+ return tcp_socket_outgoing_spec(address_and_port);
}
-#ifndef _WIN32
-int unix_socket_incoming(const char *path)
+int tcp_socket_outgoing_spec(const char *address_and_port)
{
- int s;
- struct sockaddr_un addr;
-
- s = socket(PF_UNIX, SOCK_STREAM, 0);
- if (s == -1) {
- return -1;
- }
-
- memset(&addr, 0, sizeof(addr));
- addr.sun_family = AF_UNIX;
- pstrcpy(addr.sun_path, sizeof(addr.sun_path), path);
-
- if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
- goto error;
- }
-
- if (listen(s, 128) == -1) {
- goto error;
- }
-
- return s;
-error:
- closesocket(s);
- return -1;
+ return inet_connect(address_and_port, SOCK_STREAM);
}
-int unix_socket_outgoing(const char *path)
+int tcp_socket_incoming(const char *address, uint16_t port)
{
- int s;
- struct sockaddr_un addr;
-
- s = socket(PF_UNIX, SOCK_STREAM, 0);
- if (s == -1) {
- return -1;
- }
-
- memset(&addr, 0, sizeof(addr));
- addr.sun_family = AF_UNIX;
- pstrcpy(addr.sun_path, sizeof(addr.sun_path), path);
-
- if (connect(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
- goto error;
- }
+ char address_and_port[128];
+ combine_addr(address_and_port, 128, address, port);
+ return tcp_socket_incoming_spec(address_and_port);
+}
- return s;
-error:
- closesocket(s);
- return -1;
+int tcp_socket_incoming_spec(const char *address_and_port)
+{
+ char *ostr = NULL;
+ int olen = 0;
+ return inet_listen(address_and_port, ostr, olen, SOCK_STREAM, 0);
}
-#else
+
int unix_socket_incoming(const char *path)
{
- errno = ENOTSUP;
- return -1;
+ char *ostr = NULL;
+ int olen = 0;
+
+ return unix_listen(path, ostr, olen);
}
int unix_socket_outgoing(const char *path)
{
- errno = ENOTSUP;
- return -1;
+ return unix_connect(path);
}
-#endif
-
/* Basic flow
diff --git a/nbd.h b/nbd.h
index fc3a5944f4..b38d0d08de 100644
--- a/nbd.h
+++ b/nbd.h
@@ -22,19 +22,22 @@
#include <sys/types.h>
#include <qemu-common.h>
+
#include "block_int.h"
struct nbd_request {
+ uint32_t magic;
uint32_t type;
uint64_t handle;
uint64_t from;
uint32_t len;
-};
+} __attribute__ ((__packed__));
struct nbd_reply {
+ uint32_t magic;
uint32_t error;
uint64_t handle;
-};
+} __attribute__ ((__packed__));
enum {
NBD_CMD_READ = 0,
@@ -47,6 +50,8 @@ enum {
size_t nbd_wr_sync(int fd, void *buffer, size_t size, bool do_read);
int tcp_socket_outgoing(const char *address, uint16_t port);
int tcp_socket_incoming(const char *address, uint16_t port);
+int tcp_socket_outgoing_spec(const char *address_and_port);
+int tcp_socket_incoming_spec(const char *address_and_port);
int unix_socket_outgoing(const char *path);
int unix_socket_incoming(const char *path);