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util: move recv_fd and send_fd in a separate file

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It will be used in the parasite

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Acked-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
This commit is contained in:
Andrey Vagin 2012-02-01 13:00:49 +03:00 committed by Cyrill Gorcunov
parent fd7c44dd86
commit 1465fade3b
4 changed files with 85 additions and 71 deletions
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1
Makefile
View File

@ -34,6 +34,7 @@ OBJS += proc_parse.o
OBJS += cr-dump.o
OBJS += cr-show.o
OBJS += util.o
OBJS += util-net.o
OBJS += ptrace.o
OBJS += log.o
OBJS += libnetlink.o

78
files.c
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@ -16,11 +16,9 @@
#include "image.h"
#include "list.h"
#include "util.h"
#include "util-net.h"
#include "lock.h"
#define UNIX_PATH_MAX (sizeof(struct sockaddr_un) - \
(size_t)((struct sockaddr_un *) 0)->sun_path)
enum fdinfo_states {
FD_STATE_PREP, /* Create unix sockets */
FD_STATE_CREATE, /* Create and send fd */
@ -326,13 +324,7 @@ static int open_fd(int pid, struct fdinfo_entry *fe,
(unsigned long)fe->addr, fe->type, fe->len, fi->users);
list_for_each_entry(fle, &fi->list, list) {
struct msghdr hdr;
struct iovec data;
char cmsgbuf[CMSG_SPACE(sizeof(int))];
struct cmsghdr *cmsg;
int *cmsg_data;
char dummy = '*';
int len;
fi->users--;
@ -342,35 +334,15 @@ static int open_fd(int pid, struct fdinfo_entry *fe,
pr_info("Wait fdinfo pid=%d fd=%d\n", fle->pid, fle->fd);
cr_wait_while(&fle->real_pid, 0);
pr_info("Send fd %d to %s\n", (int)fe->addr, saddr.sun_path + 1);
saddr.sun_family = AF_UNIX;
snprintf(saddr.sun_path, UNIX_PATH_MAX,
"X/crtools-fd-%d-%d", fle->real_pid, fle->fd);
pr_info("Send fd %ld to %s\n", fe->addr, saddr.sun_path + 1);
data.iov_base = &dummy;
data.iov_len = sizeof(dummy);
hdr.msg_name = (struct sockaddr *)&saddr;
hdr.msg_namelen = SUN_LEN(&saddr);
len = SUN_LEN(&saddr);
*saddr.sun_path = '\0';
hdr.msg_iov = &data;
hdr.msg_iovlen = 1;
hdr.msg_flags = 0;
hdr.msg_control = &cmsgbuf;
hdr.msg_controllen = CMSG_LEN(sizeof(int));
cmsg = CMSG_FIRSTHDR(&hdr);
cmsg->cmsg_len = hdr.msg_controllen;
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
cmsg_data = (int *)CMSG_DATA(cmsg);
*cmsg_data = fe->addr;
tmp = sendmsg(sock, &hdr, 0);
if (tmp < 0) {
if (send_fd(sock, &saddr, len, fe->addr) < 0) {
pr_perror("Can't send file descriptor");
return -1;
}
@ -382,42 +354,6 @@ out:
return 0;
}
static int recv_fd(int sock)
{
struct msghdr msg;
struct iovec iov;
char buf[1];
char ccmsg[CMSG_SPACE(sizeof(int))];
struct cmsghdr *cmsg;
int *cmsg_data;
iov.iov_base = buf;
iov.iov_len = 1;
int ret;
msg.msg_name = 0;
msg.msg_namelen = 0;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = ccmsg;
msg.msg_controllen = sizeof(ccmsg);
ret = recvmsg(sock, &msg, 0);
if (ret == -1) {
pr_perror("recvmsg");
return -1;
}
cmsg = CMSG_FIRSTHDR(&msg);
if (!cmsg->cmsg_type == SCM_RIGHTS) {
pr_perror("got control message of unknown type %d",
cmsg->cmsg_type);
return -1;
}
cmsg_data = (int *)CMSG_DATA(cmsg);
return *cmsg_data;
}
static int receive_fd(int pid, struct fdinfo_entry *fe, struct fdinfo_desc *fi)
{
int tmp;
@ -440,7 +376,7 @@ static int receive_fd(int pid, struct fdinfo_entry *fe, struct fdinfo_desc *fi)
tmp = recv_fd(fe->addr);
if (tmp < 0) {
pr_err("Can't get fd");
pr_err("Can't get fd %d\n", tmp);
return -1;
}
close(fe->addr);

9
include/util-net.h Normal file
View File

@ -0,0 +1,9 @@
#ifndef UTIL_NET_H_
#define UTIL_NET_H_
#define UNIX_PATH_MAX (sizeof(struct sockaddr_un) - \
(size_t)((struct sockaddr_un *) 0)->sun_path)
extern int send_fd(int sock, struct sockaddr_un *saddr, int len, int fd);
extern int recv_fd(int sock);
#endif

68
util-net.c Normal file
View File

@ -0,0 +1,68 @@
#include <sys/socket.h>
#include <sys/un.h>
#include "syscall.h"
int send_fd(int sock, struct sockaddr_un *saddr, int len, int fd)
{
struct msghdr hdr;
struct iovec data;
char cmsgbuf[CMSG_SPACE(sizeof(int))];
struct cmsghdr* cmsg;
int *cmsg_data;
char dummy = '*';
data.iov_base = &dummy;
data.iov_len = sizeof(dummy);
hdr.msg_name = (struct sockaddr *)saddr;
hdr.msg_namelen = len;
hdr.msg_iov = &data;
hdr.msg_iovlen = 1;
hdr.msg_flags = 0;
hdr.msg_control = &cmsgbuf;
hdr.msg_controllen = CMSG_LEN(sizeof(int));
cmsg = CMSG_FIRSTHDR(&hdr);
cmsg->cmsg_len = hdr.msg_controllen;
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
cmsg_data = (int *)CMSG_DATA(cmsg);
*cmsg_data = fd;
return sys_sendmsg(sock, &hdr, 0);
}
int recv_fd(int sock)
{
struct msghdr msg;
struct iovec iov;
char buf[1];
char ccmsg[CMSG_SPACE(sizeof(int))];
struct cmsghdr *cmsg;
int *cmsg_data;
iov.iov_base = buf;
iov.iov_len = 1;
int ret;
msg.msg_name = 0;
msg.msg_namelen = 0;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = ccmsg;
msg.msg_controllen = sizeof(ccmsg);
ret = sys_recvmsg(sock, &msg, 0);
if (ret < 0)
return ret;
cmsg = CMSG_FIRSTHDR(&msg);
if (!cmsg->cmsg_type == SCM_RIGHTS)
return -2;
cmsg_data = (int *)CMSG_DATA(cmsg);
return *cmsg_data;
}