X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;ds=sidebyside;f=src%2Fcommon%2Funix.c;h=9918db2e683e18f9e880e1025779057bb1289456;hb=HEAD;hp=edca02abf4fa246ad3d33b399ddbd0be252060b8;hpb=3d8e5be7ac1d25649786f56a2bea1740b34aad98;p=lttng-tools.git

diff --git a/src/common/unix.c b/src/common/unix.c
deleted file mode 100644
index edca02abf..000000000
--- a/src/common/unix.c
+++ /dev/null
@@ -1,714 +0,0 @@
-/*
- * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
- *                      Mathieu Desnoyers <mathieu.desnoyers@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.
- */
-
-#define _LGPL_SOURCE
-#include <assert.h>
-#include <limits.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <unistd.h>
-#include <errno.h>
-
-#include <common/common.h>
-#include <common/sessiond-comm/sessiond-comm.h>
-
-#include "unix.h"
-
-/*
- * Connect to unix socket using the path name.
- */
-LTTNG_HIDDEN
-int lttcomm_connect_unix_sock(const char *pathname)
-{
-	struct sockaddr_un s_un;
-	int fd, ret, closeret;
-
-	if (strlen(pathname) >= sizeof(s_un.sun_path)) {
-		ERR("unix socket address (\"%s\") is longer than the platform's limit (%zu > %zu).",
-				pathname, strlen(pathname) + 1,
-				sizeof(s_un.sun_path));
-		ret = -ENAMETOOLONG;
-		goto error;
-	}
-
-	fd = socket(PF_UNIX, SOCK_STREAM, 0);
-	if (fd < 0) {
-		PERROR("socket");
-		ret = fd;
-		goto error;
-	}
-
-	memset(&s_un, 0, sizeof(s_un));
-	s_un.sun_family = AF_UNIX;
-	strncpy(s_un.sun_path, pathname, sizeof(s_un.sun_path));
-	s_un.sun_path[sizeof(s_un.sun_path) - 1] = '\0';
-
-	ret = connect(fd, (struct sockaddr *) &s_un, sizeof(s_un));
-	if (ret < 0) {
-		/*
-		 * Don't print message on connect error, because connect is used in
-		 * normal execution to detect if sessiond is alive.
-		 */
-		goto error_connect;
-	}
-
-	return fd;
-
-error_connect:
-	closeret = close(fd);
-	if (closeret) {
-		PERROR("close");
-	}
-error:
-	return ret;
-}
-
-/*
- * Do an accept(2) on the sock and return the new file descriptor. The socket
- * MUST be bind(2) before.
- */
-LTTNG_HIDDEN
-int lttcomm_accept_unix_sock(int sock)
-{
-	int new_fd;
-	struct sockaddr_un s_un;
-	socklen_t len = sizeof(s_un);
-
-	/* Blocking call */
-	new_fd = accept(sock, (struct sockaddr *) &s_un, &len);
-	if (new_fd < 0) {
-		PERROR("accept");
-	}
-
-	return new_fd;
-}
-
-LTTNG_HIDDEN
-int lttcomm_create_anon_unix_socketpair(int *fds)
-{
-	if (socketpair(PF_UNIX, SOCK_STREAM, 0, fds) < 0) {
-		PERROR("socketpair");
-		return -1;
-	}
-	return 0;
-}
-
-/*
- * Creates a AF_UNIX local socket using pathname bind the socket upon creation
- * and return the fd.
- */
-LTTNG_HIDDEN
-int lttcomm_create_unix_sock(const char *pathname)
-{
-	struct sockaddr_un s_un;
-	int fd = -1;
-	int ret = -1;
-
-	if (strlen(pathname) >= sizeof(s_un.sun_path)) {
-		ERR("unix socket address (\"%s\") is longer than the platform's limit (%zu > %zu).",
-				pathname, strlen(pathname) + 1,
-				sizeof(s_un.sun_path));
-		ret = -ENAMETOOLONG;
-		goto error;
-	}
-
-	/* Create server socket */
-	if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
-		PERROR("socket");
-		goto error;
-	}
-
-	memset(&s_un, 0, sizeof(s_un));
-	s_un.sun_family = AF_UNIX;
-	strncpy(s_un.sun_path, pathname, sizeof(s_un.sun_path));
-	s_un.sun_path[sizeof(s_un.sun_path) - 1] = '\0';
-
-	/* Unlink the old file if present */
-	(void) unlink(pathname);
-	ret = bind(fd, (struct sockaddr *) &s_un, sizeof(s_un));
-	if (ret < 0) {
-		PERROR("bind");
-		goto error;
-	}
-
-	return fd;
-
-error:
-	if (fd >= 0) {
-		if (close(fd) < 0) {
-			PERROR("close create unix sock");
-		}
-	}
-	return ret;
-}
-
-/*
- * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN.
- */
-LTTNG_HIDDEN
-int lttcomm_listen_unix_sock(int sock)
-{
-	int ret;
-
-	ret = listen(sock, LTTNG_SESSIOND_COMM_MAX_LISTEN);
-	if (ret < 0) {
-		PERROR("listen");
-	}
-
-	return ret;
-}
-
-/*
- * Receive data of size len in put that data into the buf param. Using recvmsg
- * API.
- *
- * Return the size of received data.
- */
-LTTNG_HIDDEN
-ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len)
-{
-	struct msghdr msg;
-	struct iovec iov[1];
-	ssize_t ret = -1;
-	size_t len_last;
-
-	memset(&msg, 0, sizeof(msg));
-
-	iov[0].iov_base = buf;
-	iov[0].iov_len = len;
-	msg.msg_iov = iov;
-	msg.msg_iovlen = 1;
-
-	do {
-		len_last = iov[0].iov_len;
-		ret = lttng_recvmsg_nosigpipe(sock, &msg);
-		if (ret > 0) {
-			iov[0].iov_base += ret;
-			iov[0].iov_len -= ret;
-			assert(ret <= len_last);
-		}
-	} while ((ret > 0 && ret < len_last) || (ret < 0 && errno == EINTR));
-	if (ret < 0) {
-		PERROR("recvmsg");
-	} else if (ret > 0) {
-		ret = len;
-	}
-	/* Else ret = 0 meaning an orderly shutdown. */
-
-	return ret;
-}
-
-/*
- * Receive data of size len in put that data into the buf param. Using recvmsg
- * API. Only use with sockets set in non-blocking mode.
- *
- * Return the size of received data.
- */
-LTTNG_HIDDEN
-ssize_t lttcomm_recv_unix_sock_non_block(int sock, void *buf, size_t len)
-{
-	struct msghdr msg;
-	struct iovec iov[1];
-	ssize_t ret;
-
-	memset(&msg, 0, sizeof(msg));
-
-	iov[0].iov_base = buf;
-	iov[0].iov_len = len;
-	msg.msg_iov = iov;
-	msg.msg_iovlen = 1;
-
-retry:
-	ret = lttng_recvmsg_nosigpipe(sock, &msg);
-	if (ret < 0) {
-		if (errno == EINTR) {
-			goto retry;
-		} else {
-			/*
-			 * Only warn about EPIPE when quiet mode is
-			 * deactivated.
-			 * We consider EPIPE as expected.
-			 */
-			if (errno != EPIPE || !lttng_opt_quiet) {
-				PERROR("recvmsg");
-			}
-			goto end;
-		}
-	}
-	ret = len;
-end:
-	return ret;
-}
-
-/*
- * Send buf data of size len. Using sendmsg API.
- *
- * Return the size of sent data.
- */
-LTTNG_HIDDEN
-ssize_t lttcomm_send_unix_sock(int sock, const void *buf, size_t len)
-{
-	struct msghdr msg;
-	struct iovec iov[1];
-	ssize_t ret;
-
-	memset(&msg, 0, sizeof(msg));
-
-	iov[0].iov_base = (void *) buf;
-	iov[0].iov_len = len;
-	msg.msg_iov = iov;
-	msg.msg_iovlen = 1;
-
-	while (iov[0].iov_len) {
-		ret = sendmsg(sock, &msg, 0);
-		if (ret < 0) {
-			if (errno == EINTR) {
-				continue;
-			} else {
-				/*
-				 * Only warn about EPIPE when quiet mode is
-				 * deactivated.
-				 * We consider EPIPE as expected.
-				 */
-				if (errno != EPIPE || !lttng_opt_quiet) {
-					PERROR("sendmsg");
-				}
-				goto end;
-			}
-		}
-		iov[0].iov_len -= ret;
-		iov[0].iov_base += ret;
-	}
-	ret = len;
-end:
-	return ret;
-}
-
-/*
- * Send buf data of size len. Using sendmsg API.
- * Only use with non-blocking sockets. The difference with the blocking version
- * of the function is that this one does not retry to send on partial sends,
- * except if the interruption was caused by a signal (EINTR).
- *
- * Return the size of sent data.
- */
-LTTNG_HIDDEN
-ssize_t lttcomm_send_unix_sock_non_block(int sock, const void *buf, size_t len)
-{
-	struct msghdr msg;
-	struct iovec iov[1];
-	ssize_t ret;
-
-	memset(&msg, 0, sizeof(msg));
-
-	iov[0].iov_base = (void *) buf;
-	iov[0].iov_len = len;
-	msg.msg_iov = iov;
-	msg.msg_iovlen = 1;
-
-retry:
-	ret = sendmsg(sock, &msg, 0);
-	if (ret < 0) {
-		if (errno == EINTR) {
-			goto retry;
-		} else {
-			/*
-			 * Only warn about EPIPE when quiet mode is
-			 * deactivated.
-			 * We consider EPIPE as expected.
-			 */
-			if (errno != EPIPE || !lttng_opt_quiet) {
-				PERROR("sendmsg");
-			}
-			goto end;
-		}
-	}
-	ret = len;
-end:
-	return ret;
-}
-
-/*
- * Shutdown cleanly a unix socket.
- */
-LTTNG_HIDDEN
-int lttcomm_close_unix_sock(int sock)
-{
-	int ret, closeret;
-
-	/* Shutdown receptions and transmissions */
-	ret = shutdown(sock, SHUT_RDWR);
-	if (ret < 0) {
-		PERROR("shutdown");
-	}
-
-	closeret = close(sock);
-	if (closeret) {
-		PERROR("close");
-	}
-
-	return ret;
-}
-
-/*
- * Send a message accompanied by fd(s) over a unix socket.
- *
- * Returns the size of data sent, or negative error value.
- */
-LTTNG_HIDDEN
-ssize_t lttcomm_send_fds_unix_sock(int sock, const int *fds, size_t nb_fd)
-{
-	struct msghdr msg;
-	struct cmsghdr *cmptr;
-	struct iovec iov[1];
-	ssize_t ret = -1;
-	unsigned int sizeof_fds = nb_fd * sizeof(int);
-	char tmp[CMSG_SPACE(sizeof_fds)];
-	char dummy = 0;
-
-	memset(&msg, 0, sizeof(msg));
-	memset(tmp, 0, sizeof(tmp));
-
-	if (nb_fd > LTTCOMM_MAX_SEND_FDS)
-		return -EINVAL;
-
-	msg.msg_control = (caddr_t)tmp;
-	msg.msg_controllen = CMSG_LEN(sizeof_fds);
-
-	cmptr = CMSG_FIRSTHDR(&msg);
-	if (!cmptr) {
-		return -1;
-	}
-
-	cmptr->cmsg_level = SOL_SOCKET;
-	cmptr->cmsg_type = SCM_RIGHTS;
-	cmptr->cmsg_len = CMSG_LEN(sizeof_fds);
-	memcpy(CMSG_DATA(cmptr), fds, sizeof_fds);
-	/* Sum of the length of all control messages in the buffer: */
-	msg.msg_controllen = cmptr->cmsg_len;
-
-	iov[0].iov_base = &dummy;
-	iov[0].iov_len = 1;
-	msg.msg_iov = iov;
-	msg.msg_iovlen = 1;
-
-	do {
-		ret = sendmsg(sock, &msg, 0);
-	} while (ret < 0 && errno == EINTR);
-	if (ret < 0) {
-		/*
-		 * Only warn about EPIPE when quiet mode is deactivated.
-		 * We consider EPIPE as expected.
-		 */
-		if (errno != EPIPE || !lttng_opt_quiet) {
-			PERROR("sendmsg");
-		}
-	}
-	return ret;
-}
-
-/*
- * Recv a message accompanied by fd(s) from a unix socket.
- *
- * Returns the size of received data, or negative error value.
- *
- * Expect at most "nb_fd" file descriptors. Returns the number of fd
- * actually received in nb_fd.
- */
-LTTNG_HIDDEN
-ssize_t lttcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd)
-{
-	struct iovec iov[1];
-	ssize_t ret = 0;
-	struct cmsghdr *cmsg;
-	size_t sizeof_fds = nb_fd * sizeof(int);
-
-	/* Account for the struct ucred cmsg in the buffer size */
-	char recv_buf[CMSG_SPACE(sizeof_fds) + CMSG_SPACE(sizeof(struct ucred))];
-	struct msghdr msg;
-	char dummy;
-
-	memset(&msg, 0, sizeof(msg));
-
-	/* Prepare to receive the structures */
-	iov[0].iov_base = &dummy;
-	iov[0].iov_len = 1;
-	msg.msg_iov = iov;
-	msg.msg_iovlen = 1;
-
-	cmsg = (struct cmsghdr *) recv_buf;
-	cmsg->cmsg_len = CMSG_LEN(sizeof_fds);
-	cmsg->cmsg_level = SOL_SOCKET;
-	cmsg->cmsg_type = SCM_RIGHTS;
-
-	msg.msg_control = cmsg;
-	msg.msg_controllen = CMSG_LEN(sizeof(recv_buf));
-	msg.msg_flags = 0;
-
-	do {
-		ret = recvmsg(sock, &msg, 0);
-	} while (ret < 0 && errno == EINTR);
-	if (ret < 0) {
-		PERROR("recvmsg fds");
-		goto end;
-	}
-
-	if (ret != 1) {
-		fprintf(stderr, "Error: Received %zd bytes, expected %d\n",
-				ret, 1);
-		goto end;
-	}
-
-	if (msg.msg_flags & MSG_CTRUNC) {
-		fprintf(stderr, "Error: Control message truncated.\n");
-		ret = -1;
-		goto end;
-	}
-
-	/*
-	 * If the socket was configured with SO_PASSCRED, the kernel will add a
-	 * control message (cmsg) to the ancillary data of the unix socket. We
-	 * need to expect a cmsg of the SCM_CREDENTIALS as the first control
-	 * message.
-	 */
-	for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
-		if (cmsg->cmsg_level != SOL_SOCKET) {
-			fprintf(stderr, "Error: The socket needs to be of type SOL_SOCKET\n");
-			ret = -1;
-			goto end;
-		}
-		if (cmsg->cmsg_type == SCM_RIGHTS) {
-			/*
-			 * We found the controle message for file descriptors,
-			 * now copy the fds to the fds ptr and return success.
-			 */
-			if (cmsg->cmsg_len != CMSG_LEN(sizeof_fds)) {
-				fprintf(stderr, "Error: Received %zu bytes of"
-					"ancillary data for FDs, expected %zu\n",
-					(size_t) cmsg->cmsg_len,
-					(size_t) CMSG_LEN(sizeof_fds));
-				ret = -1;
-				goto end;
-			}
-			memcpy(fds, CMSG_DATA(cmsg), sizeof_fds);
-			ret = sizeof_fds;
-			goto end;
-		}
-		if (cmsg->cmsg_type == SCM_CREDENTIALS) {
-			/*
-			 * Expect credentials to be sent when expecting fds even
-			 * if no credential were include in the send(). The
-			 * kernel adds them...
-			 */
-			ret = -1;
-		}
-	}
-end:
-	return ret;
-}
-
-/*
- * Send a message with credentials over a unix socket.
- *
- * Returns the size of data sent, or negative error value.
- */
-LTTNG_HIDDEN
-ssize_t lttcomm_send_creds_unix_sock(int sock, void *buf, size_t len)
-{
-	struct msghdr msg;
-	struct iovec iov[1];
-	ssize_t ret = -1;
-#ifdef __linux__
-	struct cmsghdr *cmptr;
-	size_t sizeof_cred = sizeof(lttng_sock_cred);
-	char anc_buf[CMSG_SPACE(sizeof_cred)];
-	lttng_sock_cred *creds;
-
-	memset(anc_buf, 0, CMSG_SPACE(sizeof_cred) * sizeof(char));
-#endif /* __linux__ */
-
-	memset(&msg, 0, sizeof(msg));
-
-	iov[0].iov_base = buf;
-	iov[0].iov_len = len;
-	msg.msg_iov = iov;
-	msg.msg_iovlen = 1;
-
-#ifdef __linux__
-	msg.msg_control = (caddr_t) anc_buf;
-	msg.msg_controllen = CMSG_LEN(sizeof_cred);
-
-	cmptr = CMSG_FIRSTHDR(&msg);
-	if (!cmptr) {
-		return -1;
-	}
-	cmptr->cmsg_level = SOL_SOCKET;
-	cmptr->cmsg_type = LTTNG_SOCK_CREDS;
-	cmptr->cmsg_len = CMSG_LEN(sizeof_cred);
-
-	creds = (lttng_sock_cred*) CMSG_DATA(cmptr);
-
-	LTTNG_SOCK_SET_UID_CRED(creds, geteuid());
-	LTTNG_SOCK_SET_GID_CRED(creds, getegid());
-	LTTNG_SOCK_SET_PID_CRED(creds, getpid());
-#endif /* __linux__ */
-
-	do {
-		ret = sendmsg(sock, &msg, 0);
-	} while (ret < 0 && errno == EINTR);
-	if (ret < 0) {
-		/*
-		 * Only warn about EPIPE when quiet mode is deactivated.
-		 * We consider EPIPE as expected.
-		 */
-		if (errno != EPIPE || !lttng_opt_quiet) {
-			PERROR("sendmsg");
-		}
-	}
-	return ret;
-}
-
-/*
- * Recv a message accompanied with credentials from a unix socket.
- *
- * Returns the size of received data, or negative error value.
- */
-LTTNG_HIDDEN
-ssize_t lttcomm_recv_creds_unix_sock(int sock, void *buf, size_t len,
-		lttng_sock_cred *creds)
-{
-	struct msghdr msg;
-	struct iovec iov[1];
-	ssize_t ret;
-	size_t len_last;
-#ifdef __linux__
-	struct cmsghdr *cmptr;
-	size_t sizeof_cred = sizeof(lttng_sock_cred);
-	char anc_buf[CMSG_SPACE(sizeof_cred)];
-#endif	/* __linux__ */
-
-	memset(&msg, 0, sizeof(msg));
-
-	/* Not allowed */
-	if (creds == NULL) {
-		ret = -1;
-		goto end;
-	}
-
-	/* Prepare to receive the structures */
-	iov[0].iov_base = buf;
-	iov[0].iov_len = len;
-	msg.msg_iov = iov;
-	msg.msg_iovlen = 1;
-
-#ifdef __linux__
-	msg.msg_control = anc_buf;
-	msg.msg_controllen = sizeof(anc_buf);
-#endif /* __linux__ */
-
-	do {
-		len_last = iov[0].iov_len;
-		ret = recvmsg(sock, &msg, 0);
-		if (ret > 0) {
-			iov[0].iov_base += ret;
-			iov[0].iov_len -= ret;
-			assert(ret <= len_last);
-		}
-	} while ((ret > 0 && ret < len_last) || (ret < 0 && errno == EINTR));
-	if (ret < 0) {
-		PERROR("recvmsg fds");
-		goto end;
-	} else if (ret > 0) {
-		ret = len;
-	}
-	/* Else ret = 0 meaning an orderly shutdown. */
-
-#ifdef __linux__
-	if (msg.msg_flags & MSG_CTRUNC) {
-		fprintf(stderr, "Error: Control message truncated.\n");
-		ret = -1;
-		goto end;
-	}
-
-	cmptr = CMSG_FIRSTHDR(&msg);
-	if (cmptr == NULL) {
-		fprintf(stderr, "Error: Invalid control message header\n");
-		ret = -1;
-		goto end;
-	}
-
-	if (cmptr->cmsg_level != SOL_SOCKET ||
-			cmptr->cmsg_type != LTTNG_SOCK_CREDS) {
-		fprintf(stderr, "Didn't received any credentials\n");
-		ret = -1;
-		goto end;
-	}
-
-	if (cmptr->cmsg_len != CMSG_LEN(sizeof_cred)) {
-		fprintf(stderr, "Error: Received %zu bytes of ancillary data, expected %zu\n",
-				(size_t) cmptr->cmsg_len, (size_t) CMSG_LEN(sizeof_cred));
-		ret = -1;
-		goto end;
-	}
-
-	memcpy(creds, CMSG_DATA(cmptr), sizeof_cred);
-#elif (defined(__FreeBSD__) || defined(__CYGWIN__) || defined(__sun__) || defined(__APPLE__))
-	{
-		int peer_ret;
-
-		peer_ret = getpeereid(sock, &creds->uid, &creds->gid);
-		if (peer_ret != 0) {
-			return peer_ret;
-		}
-	}
-#else
-#error "Please implement credential support for your OS."
-#endif	/* __linux__ */
-
-end:
-	return ret;
-}
-
-/*
- * Set socket option to use credentials passing.
- */
-#ifdef __linux__
-LTTNG_HIDDEN
-int lttcomm_setsockopt_creds_unix_sock(int sock)
-{
-	int ret, on = 1;
-
-	/* Set socket for credentials retrieval */
-	ret = setsockopt(sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on));
-	if (ret < 0) {
-		PERROR("setsockopt creds unix sock");
-	}
-	return ret;
-}
-#elif (defined(__FreeBSD__) || defined(__CYGWIN__) || defined(__sun__) || defined(__APPLE__))
-LTTNG_HIDDEN
-int lttcomm_setsockopt_creds_unix_sock(int sock)
-{
-	return 0;
-}
-#else
-#error "Please implement credential support for your OS."
-#endif /* __linux__ */