* (C) Copyright IBM Corp. 2007, 2008
*
* Authors:
- * Daniel Lezcano <dlezcano at fr.ibm.com>
+ * Daniel Lezcano <daniel.lezcano at free.fr>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE 1
+#endif
+#include <errno.h>
+#include <fcntl.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
#include <string.h>
#include <unistd.h>
-#include <fcntl.h>
-#include <errno.h>
-#define __USE_GNU
#include <sys/socket.h>
-#undef __USE_GNU
+#include <sys/syscall.h>
#include <sys/un.h>
+#include "config.h"
#include "log.h"
+#include "memory_utils.h"
+#include "raw_syscalls.h"
+#include "utils.h"
+
+#ifndef HAVE_STRLCPY
+#include "include/strlcpy.h"
+#endif
-lxc_log_define(lxc_af_unix, lxc);
+lxc_log_define(af_unix, lxc);
-int lxc_af_unix_open(const char *path, int type, int flags)
+static ssize_t lxc_abstract_unix_set_sockaddr(struct sockaddr_un *addr,
+ const char *path)
{
- int fd;
- struct sockaddr_un addr;
+ size_t len;
- if (flags & O_TRUNC)
- unlink(path);
+ if (!addr || !path) {
+ errno = EINVAL;
+ return -1;
+ }
- fd = socket(PF_UNIX, type, 0);
- if (fd < 0)
+ /* Clear address structure */
+ memset(addr, 0, sizeof(*addr));
+
+ addr->sun_family = AF_UNIX;
+
+ len = strlen(&path[1]);
+
+ /* do not enforce \0-termination */
+ if (len >= INT_MAX || len >= sizeof(addr->sun_path)) {
+ errno = ENAMETOOLONG;
return -1;
+ }
- memset(&addr, 0, sizeof(addr));
+ /* do not enforce \0-termination */
+ memcpy(&addr->sun_path[1], &path[1], len);
+ return len;
+}
+
+int lxc_abstract_unix_open(const char *path, int type, int flags)
+{
+ int fd, ret;
+ ssize_t len;
+ struct sockaddr_un addr;
+
+ fd = socket(PF_UNIX, type | SOCK_CLOEXEC, 0);
+ if (fd < 0)
+ return -1;
if (!path)
return fd;
- addr.sun_family = AF_UNIX;
- /* copy entire buffer in case of abstract socket */
- memcpy(addr.sun_path, path,
- path[0]?strlen(path):sizeof(addr.sun_path));
-
- if (bind(fd, (struct sockaddr *)&addr, sizeof(addr))) {
+ len = lxc_abstract_unix_set_sockaddr(&addr, path);
+ if (len < 0) {
+ int saved_errno = errno;
close(fd);
+ errno = saved_errno;
return -1;
}
-
- if (type == SOCK_STREAM && listen(fd, 100)) {
+
+ ret = bind(fd, (struct sockaddr *)&addr,
+ offsetof(struct sockaddr_un, sun_path) + len + 1);
+ if (ret < 0) {
+ int saved_errno = errno;
close(fd);
+ errno = saved_errno;
return -1;
}
+ if (type == SOCK_STREAM) {
+ ret = listen(fd, 100);
+ if (ret < 0) {
+ int saved_errno = errno;
+ close(fd);
+ errno = saved_errno;
+ return -1;
+ }
+ }
+
return fd;
}
-int lxc_af_unix_close(int fd)
+void lxc_abstract_unix_close(int fd)
{
- struct sockaddr_un addr;
- socklen_t addrlen;
-
- if (!getsockname(fd, (struct sockaddr *)&addr, &addrlen) &&
- addr.sun_path[0])
- unlink(addr.sun_path);
-
close(fd);
-
- return 0;
}
-int lxc_af_unix_connect(const char *path)
+int lxc_abstract_unix_connect(const char *path)
{
- int fd;
+ int fd, ret;
+ ssize_t len;
struct sockaddr_un addr;
- fd = socket(PF_UNIX, SOCK_STREAM, 0);
+ fd = socket(PF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0);
if (fd < 0)
return -1;
- memset(&addr, 0, sizeof(addr));
-
- addr.sun_family = AF_UNIX;
- /* copy entire buffer in case of abstract socket */
- memcpy(addr.sun_path, path,
- path[0]?strlen(path):sizeof(addr.sun_path));
+ len = lxc_abstract_unix_set_sockaddr(&addr, path);
+ if (len < 0) {
+ int saved_errno = errno;
+ close(fd);
+ errno = saved_errno;
+ return -1;
+ }
- if (connect(fd, (struct sockaddr *)&addr, sizeof(addr))) {
+ ret = connect(fd, (struct sockaddr *)&addr,
+ offsetof(struct sockaddr_un, sun_path) + len + 1);
+ if (ret < 0) {
+ int saved_errno = errno;
close(fd);
+ errno = saved_errno;
return -1;
}
return fd;
}
-int lxc_af_unix_send_fd(int fd, int sendfd, void *data, size_t size)
+int lxc_abstract_unix_send_fds_iov(int fd, int *sendfds, int num_sendfds,
+ struct iovec *iov, size_t iovlen)
+{
+ __do_free char *cmsgbuf = NULL;
+ int ret;
+ struct msghdr msg;
+ struct cmsghdr *cmsg = NULL;
+ size_t cmsgbufsize = CMSG_SPACE(num_sendfds * sizeof(int));
+
+ memset(&msg, 0, sizeof(msg));
+
+ cmsgbuf = malloc(cmsgbufsize);
+ if (!cmsgbuf) {
+ errno = ENOMEM;
+ return -1;
+ }
+
+ msg.msg_control = cmsgbuf;
+ msg.msg_controllen = cmsgbufsize;
+
+ cmsg = CMSG_FIRSTHDR(&msg);
+ cmsg->cmsg_level = SOL_SOCKET;
+ cmsg->cmsg_type = SCM_RIGHTS;
+ cmsg->cmsg_len = CMSG_LEN(num_sendfds * sizeof(int));
+
+ msg.msg_controllen = cmsg->cmsg_len;
+
+ memcpy(CMSG_DATA(cmsg), sendfds, num_sendfds * sizeof(int));
+
+ msg.msg_iov = iov;
+ msg.msg_iovlen = iovlen;
+
+again:
+ ret = sendmsg(fd, &msg, MSG_NOSIGNAL);
+ if (ret < 0)
+ if (errno == EINTR)
+ goto again;
+
+ return ret;
+}
+
+int lxc_abstract_unix_send_fds(int fd, int *sendfds, int num_sendfds,
+ void *data, size_t size)
+{
+ char buf[1] = {0};
+ struct iovec iov = {
+ .iov_base = data ? data : buf,
+ .iov_len = data ? size : sizeof(buf),
+ };
+ return lxc_abstract_unix_send_fds_iov(fd, sendfds, num_sendfds, &iov,
+ 1);
+}
+
+int lxc_unix_send_fds(int fd, int *sendfds, int num_sendfds, void *data,
+ size_t size)
{
- struct msghdr msg = { 0 };
- struct iovec iov;
- struct cmsghdr *cmsg;
- char cmsgbuf[CMSG_SPACE(sizeof(int))];
- char buf[1];
-
- msg.msg_control = cmsgbuf;
- msg.msg_controllen = sizeof(cmsgbuf);
-
- cmsg = CMSG_FIRSTHDR(&msg);
- cmsg->cmsg_len = CMSG_LEN(sizeof(int));
- cmsg->cmsg_level = SOL_SOCKET;
- cmsg->cmsg_type = SCM_RIGHTS;
- *((int *) CMSG_DATA(cmsg)) = sendfd;
-
- msg.msg_name = NULL;
- msg.msg_namelen = 0;
-
- iov.iov_base = data ? data : buf;
- iov.iov_len = data ? size : sizeof(buf);
- msg.msg_iov = &iov;
- msg.msg_iovlen = 1;
-
- return sendmsg(fd, &msg, 0);
+ return lxc_abstract_unix_send_fds(fd, sendfds, num_sendfds, data, size);
}
-int lxc_af_unix_recv_fd(int fd, int *recvfd, void *data, size_t size)
+static int lxc_abstract_unix_recv_fds_iov(int fd, int *recvfds, int num_recvfds,
+ struct iovec *iov, size_t iovlen)
{
- struct msghdr msg = { 0 };
- struct iovec iov;
- struct cmsghdr *cmsg;
- char cmsgbuf[CMSG_SPACE(sizeof(int))];
- char buf[1];
+ __do_free char *cmsgbuf = NULL;
int ret;
+ struct msghdr msg;
+ struct cmsghdr *cmsg = NULL;
+ char buf[1] = {0};
+ size_t cmsgbufsize = CMSG_SPACE(sizeof(struct ucred)) +
+ CMSG_SPACE(num_recvfds * sizeof(int));
- msg.msg_name = NULL;
- msg.msg_namelen = 0;
- msg.msg_control = cmsgbuf;
- msg.msg_controllen = sizeof(cmsgbuf);
+ memset(&msg, 0, sizeof(msg));
- iov.iov_base = data ? data : buf;
- iov.iov_len = data ? size : sizeof(buf);
- msg.msg_iov = &iov;
- msg.msg_iovlen = 1;
+ cmsgbuf = malloc(cmsgbufsize);
+ if (!cmsgbuf) {
+ errno = ENOMEM;
+ return -1;
+ }
+
+ msg.msg_control = cmsgbuf;
+ msg.msg_controllen = cmsgbufsize;
+
+ msg.msg_iov = iov;
+ msg.msg_iovlen = iovlen;
+again:
ret = recvmsg(fd, &msg, 0);
- if (ret <= 0)
- goto out;
+ if (ret < 0) {
+ if (errno == EINTR)
+ goto again;
- cmsg = CMSG_FIRSTHDR(&msg);
+ goto out;
+ }
+ if (ret == 0)
+ goto out;
- /* if the message is wrong the variable will not be
- * filled and the peer will notified about a problem */
- *recvfd = -1;
+ /*
+ * If SO_PASSCRED is set we will always get a ucred message.
+ */
+ for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
+ if (cmsg->cmsg_type != SCM_RIGHTS)
+ continue;
+
+ memset(recvfds, -1, num_recvfds * sizeof(int));
+ if (cmsg &&
+ cmsg->cmsg_len == CMSG_LEN(num_recvfds * sizeof(int)) &&
+ cmsg->cmsg_level == SOL_SOCKET)
+ memcpy(recvfds, CMSG_DATA(cmsg), num_recvfds * sizeof(int));
+ break;
+ }
- if (cmsg && cmsg->cmsg_len == CMSG_LEN(sizeof(int)) &&
- cmsg->cmsg_level == SOL_SOCKET &&
- cmsg->cmsg_type == SCM_RIGHTS) {
- *recvfd = *((int *) CMSG_DATA(cmsg));
- }
out:
- return ret;
+ return ret;
+}
+
+int lxc_abstract_unix_recv_fds(int fd, int *recvfds, int num_recvfds,
+ void *data, size_t size)
+{
+ char buf[1] = {0};
+ struct iovec iov = {
+ .iov_base = data ? data : buf,
+ .iov_len = data ? size : sizeof(buf),
+ };
+ return lxc_abstract_unix_recv_fds_iov(fd, recvfds, num_recvfds, &iov, 1);
}
-int lxc_af_unix_send_credential(int fd, void *data, size_t size)
+int lxc_abstract_unix_send_credential(int fd, void *data, size_t size)
{
- struct msghdr msg = { 0 };
- struct iovec iov;
- struct cmsghdr *cmsg;
+ struct msghdr msg = {0};
+ struct iovec iov;
+ struct cmsghdr *cmsg;
struct ucred cred = {
- .pid = getpid(),
- .uid = getuid(),
- .gid = getgid(),
+ .pid = lxc_raw_getpid(), .uid = getuid(), .gid = getgid(),
};
- char cmsgbuf[CMSG_SPACE(sizeof(cred))];
- char buf[1];
+ char cmsgbuf[CMSG_SPACE(sizeof(cred))] = {0};
+ char buf[1] = {0};
- msg.msg_control = cmsgbuf;
- msg.msg_controllen = sizeof(cmsgbuf);
+ msg.msg_control = cmsgbuf;
+ msg.msg_controllen = sizeof(cmsgbuf);
- cmsg = CMSG_FIRSTHDR(&msg);
- cmsg->cmsg_len = CMSG_LEN(sizeof(struct ucred));
- cmsg->cmsg_level = SOL_SOCKET;
- cmsg->cmsg_type = SCM_CREDENTIALS;
- *((struct ucred *) CMSG_DATA(cmsg)) = cred;
+ cmsg = CMSG_FIRSTHDR(&msg);
+ cmsg->cmsg_len = CMSG_LEN(sizeof(struct ucred));
+ cmsg->cmsg_level = SOL_SOCKET;
+ cmsg->cmsg_type = SCM_CREDENTIALS;
+ memcpy(CMSG_DATA(cmsg), &cred, sizeof(cred));
- msg.msg_name = NULL;
- msg.msg_namelen = 0;
+ msg.msg_name = NULL;
+ msg.msg_namelen = 0;
- iov.iov_base = data ? data : buf;
- iov.iov_len = data ? size : sizeof(buf);
- msg.msg_iov = &iov;
- msg.msg_iovlen = 1;
+ iov.iov_base = data ? data : buf;
+ iov.iov_len = data ? size : sizeof(buf);
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
- return sendmsg(fd, &msg, 0);
+ return sendmsg(fd, &msg, MSG_NOSIGNAL);
}
-int lxc_af_unix_rcv_credential(int fd, void *data, size_t size)
+int lxc_abstract_unix_rcv_credential(int fd, void *data, size_t size)
{
- struct msghdr msg = { 0 };
- struct iovec iov;
- struct cmsghdr *cmsg;
+ struct msghdr msg = {0};
+ struct iovec iov;
+ struct cmsghdr *cmsg;
struct ucred cred;
- char cmsgbuf[CMSG_SPACE(sizeof(cred))];
- char buf[1];
int ret;
+ char cmsgbuf[CMSG_SPACE(sizeof(cred))] = {0};
+ char buf[1] = {0};
- msg.msg_name = NULL;
- msg.msg_namelen = 0;
- msg.msg_control = cmsgbuf;
- msg.msg_controllen = sizeof(cmsgbuf);
+ msg.msg_name = NULL;
+ msg.msg_namelen = 0;
+ msg.msg_control = cmsgbuf;
+ msg.msg_controllen = sizeof(cmsgbuf);
- iov.iov_base = data ? data : buf;
- iov.iov_len = data ? size : sizeof(buf);
- msg.msg_iov = &iov;
- msg.msg_iovlen = 1;
+ iov.iov_base = data ? data : buf;
+ iov.iov_len = data ? size : sizeof(buf);
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
ret = recvmsg(fd, &msg, 0);
if (ret <= 0)
goto out;
- cmsg = CMSG_FIRSTHDR(&msg);
-
- if (cmsg && cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred)) &&
- cmsg->cmsg_level == SOL_SOCKET &&
- cmsg->cmsg_type == SCM_CREDENTIALS) {
- cred = *((struct ucred *) CMSG_DATA(cmsg));
- if (cred.uid && (cred.uid != getuid() || cred.gid != getgid())) {
- INFO("message denied for '%d/%d'", cred.uid, cred.gid);
- return -EACCES;
+ cmsg = CMSG_FIRSTHDR(&msg);
+
+ if (cmsg && cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred)) &&
+ cmsg->cmsg_level == SOL_SOCKET &&
+ cmsg->cmsg_type == SCM_CREDENTIALS) {
+ memcpy(&cred, CMSG_DATA(cmsg), sizeof(cred));
+ if (cred.uid &&
+ (cred.uid != getuid() || cred.gid != getgid())) {
+ INFO("Message denied for '%d/%d'", cred.uid, cred.gid);
+ errno = EACCES;
+ return -1;
}
- }
+ }
+
out:
- return ret;
+ return ret;
+}
+
+int lxc_unix_sockaddr(struct sockaddr_un *ret, const char *path)
+{
+ size_t len;
+
+ len = strlen(path);
+ if (len == 0)
+ return minus_one_set_errno(EINVAL);
+ if (path[0] != '/' && path[0] != '@')
+ return minus_one_set_errno(EINVAL);
+ if (path[1] == '\0')
+ return minus_one_set_errno(EINVAL);
+
+ if (len + 1 > sizeof(ret->sun_path))
+ return minus_one_set_errno(EINVAL);
+
+ *ret = (struct sockaddr_un){
+ .sun_family = AF_UNIX,
+ };
+
+ if (path[0] == '@') {
+ memcpy(ret->sun_path + 1, path + 1, len);
+ return (int)(offsetof(struct sockaddr_un, sun_path) + len);
+ }
+
+ memcpy(ret->sun_path, path, len + 1);
+ return (int)(offsetof(struct sockaddr_un, sun_path) + len + 1);
+}
+
+int lxc_unix_connect_type(struct sockaddr_un *addr, int type)
+{
+ __do_close_prot_errno int fd = -EBADF;
+ int ret;
+ ssize_t len;
+
+ fd = socket(AF_UNIX, type | SOCK_CLOEXEC, 0);
+ if (fd < 0) {
+ SYSERROR("Failed to open new AF_UNIX socket");
+ return -1;
+ }
+
+ if (addr->sun_path[0] == '\0')
+ len = strlen(&addr->sun_path[1]);
+ else
+ len = strlen(&addr->sun_path[0]);
+
+ ret = connect(fd, (struct sockaddr *)addr,
+ offsetof(struct sockaddr_un, sun_path) + len);
+ if (ret < 0) {
+ SYSERROR("Failed to bind new AF_UNIX socket");
+ return -1;
+ }
+
+ return move_fd(fd);
+}
+
+int lxc_unix_connect(struct sockaddr_un *addr, int type)
+{
+ return lxc_unix_connect_type(addr, SOCK_STREAM);
+}
+
+int lxc_socket_set_timeout(int fd, int rcv_timeout, int snd_timeout)
+{
+ struct timeval out = {0};
+ int ret;
+
+ out.tv_sec = snd_timeout;
+ ret = setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, (const void *)&out,
+ sizeof(out));
+ if (ret < 0)
+ return -1;
+
+ out.tv_sec = rcv_timeout;
+ ret = setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, (const void *)&out,
+ sizeof(out));
+ if (ret < 0)
+ return -1;
+
+ return 0;
}
projects / mirror_lxc.git / blobdiff