/*
- * Copyright (C) 2005-2014 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>
*
* Licensed under the GPL v2. For licencing details see COPYING.
*/
/** \file net.c Networking-related helper functions. */
-/*
- * Since glibc 2.8, the _GNU_SOURCE feature test macro must be defined in order
- * to obtain the definition of the ucred structure.
- */
-#define _GNU_SOURCE
+#include "para.h"
#include <netinet/in.h>
#include <arpa/inet.h>
#include <regex.h>
-#include "para.h"
#include "error.h"
#include "net.h"
#include "string.h"
* \param netmask Value of the netmask part in \a cidr or the
* default of 32 if not specified.
*
- * \return Pointer to \a addr if succesful, NULL on error.
+ * \return Pointer to \a addr if successful, NULL on error.
* \sa RFC 4632
*/
char *parse_cidr(const char *cidr,
}
if (*o == ':')
- if (para_atoi32(++o, port) < 0 ||
- *port < 0 || *port > 0xffff)
+ if (para_atoi32(++o, port) < 0 || *port < 0 || *port > 0xffff)
goto failed;
if (host_string_ok(host))
return host;
/**
* Stringify port number, resolve into service name where defined.
+ *
* \param port 2-byte port number, in host-byte-order.
* \param transport Transport protocol name (e.g. "udp", "tcp"), or NULL.
* \return Pointer to static result buffer.
struct servent *se = getservbyport(htons(port), transport);
if (se == NULL)
- snprintf(service, sizeof(service), "%u", port);
+ snprintf(service, sizeof(service), "%d", port);
else
snprintf(service, sizeof(service), "%s", se->s_name);
}
*
* \param sockfd The socket file descriptor.
*
- * The socket must be connected. See RFC 1122, 3.3.3. If the protocol familiy
+ * The socket must be connected. See RFC 1122, 3.3.3. If the protocol family
* could not be determined, \p AF_INET is assumed.
*
* \return The maximum message size of the address family type.
}
/**
- * Look up the local or remote side of a connected socket structure.
+ * Look up the remote side of a connected socket structure.
*
* \param fd The socket descriptor of the connected socket.
- * \param getname Either \p getsockname() for local, or \p getpeername() for
- * remote side.
*
* \return A static character string identifying hostname and port of the
* chosen side in numeric host:port format.
* \sa getsockname(2), getpeername(2), parse_url(), getnameinfo(3),
* services(5), nsswitch.conf(5).
*/
-static char *__get_sock_name(int fd, typeof(getsockname) getname)
+char *remote_name(int fd)
{
struct sockaddr_storage ss;
const struct sockaddr *sa;
static char output[sizeof(hbuf) + sizeof(sbuf) + 4];
int ret;
- if (getname(fd, (struct sockaddr *)&ss, &sslen) < 0) {
+ if (getpeername(fd, (struct sockaddr *)&ss, &sslen) < 0) {
PARA_ERROR_LOG("can not determine address from fd %d: %s\n",
fd, strerror(errno));
snprintf(output, sizeof(output), "(unknown)");
return output;
}
-/**
- * Look up the local side of a connected socket structure.
- *
- * \param sockfd The file descriptor of the socket.
- *
- * \return A pointer to a static buffer containing hostname an port. This
- * buffer must not be freed by the caller.
- *
- * \sa remote_name().
- */
-char *local_name(int sockfd)
-{
- return __get_sock_name(sockfd, getsockname);
-}
-
-/**
- * Look up the remote side of a connected socket structure.
- *
- * \param sockfd The file descriptor of the socket.
- *
- * \return Analogous to the return value of \ref local_name() but for the
- * remote side.
- *
- * \sa local_name().
- */
-char *remote_name(int sockfd)
-{
- return __get_sock_name(sockfd, getpeername);
-}
-
/**
* Extract IPv4 or IPv6-mapped-IPv4 address from sockaddr_storage.
*
* \return Positive on success, \p -E_NAME_TOO_LONG if \a name is longer
* than \p UNIX_PATH_MAX.
*/
-static int init_unix_addr(struct sockaddr_un *u, const char *name)
+static int init_unix_addr(struct sockaddr_un *u, const char *name,
+ bool abstract)
{
- if (strlen(name) >= UNIX_PATH_MAX)
+ if (strlen(name) + abstract >= UNIX_PATH_MAX)
return -E_NAME_TOO_LONG;
memset(u->sun_path, 0, UNIX_PATH_MAX);
u->sun_family = PF_UNIX;
- strcpy(u->sun_path, name);
+ strcpy(u->sun_path + abstract, name);
return 1;
}
/**
- * Prepare, create, and bind a socket for local communication.
+ * Create a socket for local communication and listen on it.
*
* \param name The socket pathname.
- * \param unix_addr Pointer to the \p AF_UNIX socket structure.
- * \param mode The desired mode of the socket.
+ * \param mode The desired permissions of the socket.
+ *
+ * This function creates a passive local socket for sequenced, reliable,
+ * two-way, connection-based byte streams. The socket file descriptor is set to
+ * nonblocking mode and listen(2) is called to prepare the socket for
+ * accepting incoming connection requests.
*
- * This function creates a local socket for sequenced, reliable,
- * two-way, connection-based byte streams.
+ * If mode is zero, an abstract socket (a non-portable Linux extension) is
+ * created. In this case the socket name has no connection with filesystem
+ * pathnames.
*
- * \return The file descriptor, on success, negative on errors.
+ * \return The file descriptor on success, negative error code on failure.
*
- * \sa socket(2)
- * \sa bind(2)
- * \sa chmod(2)
+ * \sa socket(2), \sa bind(2), \sa chmod(2), listen(2), unix(7).
*/
-int create_local_socket(const char *name, struct sockaddr_un *unix_addr,
- mode_t mode)
+int create_local_socket(const char *name, mode_t mode)
{
+ struct sockaddr_un unix_addr;
int fd, ret;
+ bool abstract = mode == 0;
- ret = init_unix_addr(unix_addr, name);
+ ret = init_unix_addr(&unix_addr, name, abstract);
if (ret < 0)
return ret;
ret = socket(PF_UNIX, SOCK_STREAM, 0);
if (ret < 0)
return -ERRNO_TO_PARA_ERROR(errno);
fd = ret;
- ret = bind(fd, (struct sockaddr *) unix_addr, UNIX_PATH_MAX);
+ ret = mark_fd_nonblocking(fd);
+ if (ret < 0)
+ goto err;
+ ret = bind(fd, (struct sockaddr *)&unix_addr, sizeof(unix_addr));
if (ret < 0) {
ret = -ERRNO_TO_PARA_ERROR(errno);
goto err;
}
- ret = -E_CHMOD;
- if (chmod(name, mode) < 0)
+ if (!abstract) {
+ ret = -E_CHMOD;
+ if (chmod(name, mode) < 0)
+ goto err;
+ }
+ if (listen(fd , 5) < 0) {
+ ret = -ERRNO_TO_PARA_ERROR(errno);
goto err;
+ }
return fd;
err:
close(fd);
int fd, ret;
PARA_DEBUG_LOG("connecting to %s\n", name);
- ret = init_unix_addr(&unix_addr, name);
- if (ret < 0)
- return ret;
fd = socket(PF_UNIX, SOCK_STREAM, 0);
if (fd < 0)
return -ERRNO_TO_PARA_ERROR(errno);
- if (connect(fd, (struct sockaddr *)&unix_addr, sizeof(unix_addr)) == -1) {
- ret = -ERRNO_TO_PARA_ERROR(errno);
+ /* first try (linux-only) abstract socket */
+ ret = init_unix_addr(&unix_addr, name, true);
+ if (ret < 0)
goto err;
- }
- return fd;
+ if (connect(fd, (struct sockaddr *)&unix_addr, sizeof(unix_addr)) != -1)
+ return fd;
+ /* next try pathname socket */
+ ret = init_unix_addr(&unix_addr, name, false);
+ if (ret < 0)
+ goto err;
+ if (connect(fd, (struct sockaddr *)&unix_addr, sizeof(unix_addr)) != -1)
+ return fd;
+ ret = -ERRNO_TO_PARA_ERROR(errno);
err:
close(fd);
return ret;
return recv_buffer(fd, buf, size) > 0? 1 : -E_RECVMSG;
}
#else /* HAVE_UCRED */
+
/**
- * Send \p NULL-terminated buffer and Unix credentials of the current process.
+ * Send a buffer and the credentials of the current process to a socket.
*
- * \param sock The socket file descriptor.
- * \param buf The buffer to be sent.
+ * \param sock The file descriptor of the sending socket.
+ * \param buf The zero-terminated buffer to send.
*
- * \return On success, this call returns the number of characters sent. On
- * error, \p -E_SENDMSG is returned.
+ * \return On success, this call returns the number of bytes sent. On errors,
+ * \p -E_SENDMSG is returned.
*
- * \sa sendmsg(2), okir's Black Hats Manual.
+ * \sa \ref recv_cred_buffer, sendmsg(2), socket(7), unix(7), okir's Black Hats
+ * Manual.
*/
ssize_t send_cred_buffer(int sock, char *buf)
{
/* Response data */
iov.iov_base = buf;
- iov.iov_len = strlen(buf);
+ iov.iov_len = strlen(buf);
c.pid = getpid();
c.uid = getuid();
c.gid = getgid();
*(struct ucred *)CMSG_DATA(cmsg) = c;
msg.msg_controllen = cmsg->cmsg_len;
ret = sendmsg(sock, &msg, 0);
- if (ret < 0)
+ if (ret < 0)
ret = -E_SENDMSG;
return ret;
}
/**
* Receive a buffer and the Unix credentials of the sending process.
*
- * \param fd the socket file descriptor.
- * \param buf the buffer to store the message.
- * \param size the size of \a buffer.
+ * \param fd The file descriptor of the receiving socket.
+ * \param buf The buffer to store the received message.
+ * \param size The length of \a buf in bytes.
*
- * \return negative on errors, the user id on success.
+ * \return Negative on errors, the user id of the sending process on success.
*
- * \sa recvmsg(2), okir's Black Hats Manual.
+ * \sa \ref send_cred_buffer and the references given there.
*/
int recv_cred_buffer(int fd, char *buf, size_t size)
{
- char control[255];
+ char control[255] __a_aligned(8);
struct msghdr msg;
struct cmsghdr *cmsg;
struct iovec iov;
} else
if (cmsg->cmsg_level == SOL_SOCKET
&& cmsg->cmsg_type == SCM_RIGHTS) {
- dispose_fds((int *) CMSG_DATA(cmsg),
+ dispose_fds((int *)CMSG_DATA(cmsg),
(cmsg->cmsg_len - CMSG_LEN(0))
/ sizeof(int));
}
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