+++ /dev/null
-/*
- * Copyright (C) 2011 - David Goulet <dgoulet@efficios.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, version 2 only,
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#ifndef _COMPAT_SOCKET_H
-#define _COMPAT_SOCKET_H
-
-#include <sys/socket.h>
-#include <sys/un.h>
-
-#include <common/macros.h>
-
-#ifndef MSG_NOSIGNAL
-# ifdef SO_NOSIGPIPE
-# define MSG_NOSIGNAL SO_NOSIGPIPE
-# endif
-#endif
-
-#if defined(MSG_NOSIGNAL)
-static inline
-ssize_t lttng_recvmsg_nosigpipe(int sockfd, struct msghdr *msg)
-{
- return recvmsg(sockfd, msg, MSG_NOSIGNAL);
-}
-#else
-
-#include <signal.h>
-#include <errno.h>
-
-static inline
-ssize_t lttng_recvmsg_nosigpipe(int sockfd, struct msghdr *msg)
-{
- ssize_t received;
- int saved_err;
- sigset_t sigpipe_set, pending_set, old_set;
- int sigpipe_was_pending;
-
- /*
- * Discard the SIGPIPE from send(), not disturbing any SIGPIPE
- * that might be already pending. If a bogus SIGPIPE is sent to
- * the entire process concurrently by a malicious user, it may
- * be simply discarded.
- */
- if (sigemptyset(&pending_set)) {
- return -1;
- }
- /*
- * sigpending returns the mask of signals that are _both_
- * blocked for the thread _and_ pending for either the thread or
- * the entire process.
- */
- if (sigpending(&pending_set)) {
- return -1;
- }
- sigpipe_was_pending = sigismember(&pending_set, SIGPIPE);
- /*
- * If sigpipe was pending, it means it was already blocked, so
- * no need to block it.
- */
- if (!sigpipe_was_pending) {
- if (sigemptyset(&sigpipe_set)) {
- return -1;
- }
- if (sigaddset(&sigpipe_set, SIGPIPE)) {
- return -1;
- }
- if (pthread_sigmask(SIG_BLOCK, &sigpipe_set, &old_set)) {
- return -1;
- }
- }
-
- /* Send and save errno. */
- received = recvmsg(sockfd, msg, 0);
- saved_err = errno;
-
- if (received == -1 && errno == EPIPE && !sigpipe_was_pending) {
- struct timespec timeout = { 0, 0 };
- int ret;
-
- do {
- ret = sigtimedwait(&sigpipe_set, NULL,
- &timeout);
- } while (ret == -1 && errno == EINTR);
- }
- if (!sigpipe_was_pending) {
- if (pthread_sigmask(SIG_SETMASK, &old_set, NULL)) {
- return -1;
- }
- }
- /* Restore send() errno */
- errno = saved_err;
-
- return received;
-}
-#endif
-
-
-#ifdef __linux__
-
-#define LTTNG_SOCK_CREDS SCM_CREDENTIALS
-
-typedef struct ucred lttng_sock_cred;
-
-#define LTTNG_SOCK_SET_UID_CRED(c, u) LTTNG_REF(c)->uid = u
-#define LTTNG_SOCK_SET_GID_CRED(c, g) LTTNG_REF(c)->gid = g
-#define LTTNG_SOCK_SET_PID_CRED(c, p) LTTNG_REF(c)->pid = p
-
-#define LTTNG_SOCK_GET_UID_CRED(c) LTTNG_REF(c)->uid
-#define LTTNG_SOCK_GET_GID_CRED(c) LTTNG_REF(c)->gid
-#define LTTNG_SOCK_GET_PID_CRED(c) LTTNG_REF(c)->pid
-
-#elif (defined(__FreeBSD__) || defined(__CYGWIN__) || defined(__sun__))
-
-struct lttng_sock_cred {
- uid_t uid;
- gid_t gid;
-};
-
-typedef struct lttng_sock_cred lttng_sock_cred;
-
-#define LTTNG_SOCK_GET_UID_CRED(c) LTTNG_REF(c)->uid
-#define LTTNG_SOCK_GET_GID_CRED(c) LTTNG_REF(c)->gid
-#define LTTNG_SOCK_GET_PID_CRED(c) -1
-
-#else
-#error "Please add support for your OS."
-#endif /* __linux__ , __FreeBSD__ */
-
-
-#ifdef __sun__
-
-# ifndef CMSG_ALIGN
-# ifdef _CMSG_DATA_ALIGN
-# define CMSG_ALIGN(len) _CMSG_DATA_ALIGN(len)
-# else
- /* aligning to sizeof (long) is assumed to be portable (fd.o#40235) */
-# define CMSG_ALIGN(len) (((len) + sizeof (long) - 1) & ~(sizeof (long) - 1))
-# endif
-# ifndef CMSG_SPACE
-# define CMSG_SPACE(len) (CMSG_ALIGN (sizeof (struct cmsghdr)) + CMSG_ALIGN (len))
-# endif
-# ifndef CMSG_LEN
-# define CMSG_LEN(len) (CMSG_ALIGN (sizeof (struct cmsghdr)) + (len))
-# endif
-# endif
-
-
-#include <ucred.h>
-
-static inline
-int getpeereid(int s, uid_t *euid, gid_t *gid)
-{
- int ret = 0;
- ucred_t *ucred = NULL;
-
- ret = getpeerucred(s, &ucred);
- if (ret == -1) {
- goto end;
- }
-
- ret = ucred_geteuid(ucred);
- if (ret == -1) {
- goto free;
- }
- *euid = ret;
-
- ret = ucred_getrgid(ucred);
- if (ret == -1) {
- goto free;
- }
- *gid = ret;
- ret = 0;
-free:
- ucred_free(ucred);
-end:
- return ret;
-}
-
-#endif /* __sun__ */
-
-#endif /* _COMPAT_SOCKET_H */
projects / lttng-tools.git / blobdiff