+++ /dev/null
-/*
- * 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 as published by the Free
- * Software Foundation; only version 2 of the License.
- *
- * 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., 59 Temple
- * Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-
-#define _GNU_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 <sys/un.h>
-#include <unistd.h>
-#include <errno.h>
-
-#include <lttng-sessiond-comm.h>
-
-/*
- * Human readable error message.
- */
-static const char *lttcomm_readable_code[] = {
- [ LTTCOMM_ERR_INDEX(LTTCOMM_OK) ] = "Success",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_ERR) ] = "Unknown error",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_UND) ] = "Undefined command",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_NOT_IMPLEMENTED) ] = "Not implemented",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_UNKNOWN_DOMAIN) ] = "Unknown tracing domain",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_SESSION) ] = "No session found",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_LIST_FAIL) ] = "Unable to list traceable apps",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_APPS) ] = "No traceable apps found",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_SESS_NOT_FOUND) ] = "Session name not found",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACE) ] = "No trace found",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_FATAL) ] = "Fatal error of the session daemon",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_CREATE_FAIL) ] = "Create trace failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_START_FAIL) ] = "Start trace failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_STOP_FAIL) ] = "Stop trace failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACEABLE) ] = "App is not traceable",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_SELECT_SESS) ] = "A session MUST be selected",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_EXIST_SESS) ] = "Session name already exist",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_CONNECT_FAIL) ] = "Unable to connect to Unix socket",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_APP_NOT_FOUND) ] = "Application not found",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_EPERM) ] = "Permission denied",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NA) ] = "Kernel tracer not available",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_EVENT_EXIST) ] = "Kernel event already exists",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_SESS_FAIL) ] = "Kernel create session failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_FAIL) ] = "Kernel create channel failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_NOT_FOUND) ] = "Kernel channel not found",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_DISABLE_FAIL) ] = "Disable kernel channel failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_ENABLE_FAIL) ] = "Enable kernel channel failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CONTEXT_FAIL) ] = "Add kernel context failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_ENABLE_FAIL) ] = "Enable kernel event failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DISABLE_FAIL) ] = "Disable kernel event failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_META_FAIL) ] = "Opening metadata failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_START_FAIL) ] = "Starting kernel trace failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STOP_FAIL) ] = "Stoping kernel trace failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CONSUMER_FAIL) ] = "Kernel consumer start failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STREAM_FAIL) ] = "Kernel create stream failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_FAIL) ] = "Kernel trace directory creation failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_EXIST) ] = "Kernel trace directory already exist",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NO_SESSION) ] = "No kernel session found",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_LIST_FAIL) ] = "Listing kernel events failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_SESS_FAIL) ] = "UST create session failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_FAIL) ] = "UST create channel failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_EXIST) ] = "UST channel already exist",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_NOT_FOUND) ] = "UST channel not found",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_DISABLE_FAIL) ] = "Disable UST channel failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_ENABLE_FAIL) ] = "Enable UST channel failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONTEXT_FAIL) ] = "Add UST context failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_ENABLE_FAIL) ] = "Enable UST event failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_DISABLE_FAIL) ] = "Disable UST event failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_META_FAIL) ] = "Opening metadata failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_START_FAIL) ] = "Starting UST trace failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_STOP_FAIL) ] = "Stoping UST trace failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONSUMER64_FAIL) ] = "64-bit UST consumer start failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONSUMER32_FAIL) ] = "32-bit UST consumer start failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_STREAM_FAIL) ] = "UST create stream failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_DIR_FAIL) ] = "UST trace directory creation failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_DIR_EXIST) ] = "UST trace directory already exist",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_NO_SESSION) ] = "No UST session found",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_LIST_FAIL) ] = "Listing UST events failed",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_EVENT_EXIST) ] = "UST event already exist",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_EVENT_NOT_FOUND)] = "UST event not found",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONTEXT_EXIST)] = "UST context already exist",
- [ LTTCOMM_ERR_INDEX(CONSUMERD_COMMAND_SOCK_READY) ] = "consumerd command socket ready",
- [ LTTCOMM_ERR_INDEX(CONSUMERD_SUCCESS_RECV_FD) ] = "consumerd success on receiving fds",
- [ LTTCOMM_ERR_INDEX(CONSUMERD_ERROR_RECV_FD) ] = "consumerd error on receiving fds",
- [ LTTCOMM_ERR_INDEX(CONSUMERD_ERROR_RECV_CMD) ] = "consumerd error on receiving command",
- [ LTTCOMM_ERR_INDEX(CONSUMERD_POLL_ERROR) ] = "consumerd error in polling thread",
- [ LTTCOMM_ERR_INDEX(CONSUMERD_POLL_NVAL) ] = "consumerd polling on closed fd",
- [ LTTCOMM_ERR_INDEX(CONSUMERD_POLL_HUP) ] = "consumerd all fd hung up",
- [ LTTCOMM_ERR_INDEX(CONSUMERD_EXIT_SUCCESS) ] = "consumerd exiting normally",
- [ LTTCOMM_ERR_INDEX(CONSUMERD_EXIT_FAILURE) ] = "consumerd exiting on error",
- [ LTTCOMM_ERR_INDEX(CONSUMERD_OUTFD_ERROR) ] = "consumerd error opening the tracefile",
- [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_EBADF) ] = "consumerd splice EBADF",
- [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_EINVAL) ] = "consumerd splice EINVAL",
- [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_ENOMEM) ] = "consumerd splice ENOMEM",
- [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_ESPIPE) ] = "consumerd splice ESPIPE",
- [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_EVENT) ] = "Event not found",
-};
-
-/*
- * Return ptr to string representing a human readable error code from the
- * lttcomm_return_code enum.
- *
- * These code MUST be negative in other to treat that as an error value.
- */
-const char *lttcomm_get_readable_code(enum lttcomm_return_code code)
-{
- int tmp_code = -code;
-
- if (tmp_code >= LTTCOMM_OK && tmp_code < LTTCOMM_NR) {
- return lttcomm_readable_code[LTTCOMM_ERR_INDEX(tmp_code)];
- }
-
- return "Unknown error code";
-}
-
-/*
- * Connect to unix socket using the path name.
- */
-int lttcomm_connect_unix_sock(const char *pathname)
-{
- struct sockaddr_un sun;
- int fd;
- int ret;
-
- fd = socket(PF_UNIX, SOCK_STREAM, 0);
- if (fd < 0) {
- perror("socket");
- ret = fd;
- goto error;
- }
-
- memset(&sun, 0, sizeof(sun));
- sun.sun_family = AF_UNIX;
- strncpy(sun.sun_path, pathname, sizeof(sun.sun_path));
- sun.sun_path[sizeof(sun.sun_path) - 1] = '\0';
-
- ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun));
- 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:
- close(fd);
-error:
- return ret;
-}
-
-/*
- * Do an accept(2) on the sock and return the new file descriptor. The socket
- * MUST be bind(2) before.
- */
-int lttcomm_accept_unix_sock(int sock)
-{
- int new_fd;
- struct sockaddr_un sun;
- socklen_t len = 0;
-
- /* Blocking call */
- new_fd = accept(sock, (struct sockaddr *) &sun, &len);
- if (new_fd < 0) {
- perror("accept");
- }
-
- return new_fd;
-}
-
-/*
- * Creates a AF_UNIX local socket using pathname bind the socket upon creation
- * and return the fd.
- */
-int lttcomm_create_unix_sock(const char *pathname)
-{
- struct sockaddr_un sun;
- int fd;
- int ret = -1;
-
- /* Create server socket */
- if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
- perror("socket");
- goto error;
- }
-
- memset(&sun, 0, sizeof(sun));
- sun.sun_family = AF_UNIX;
- strncpy(sun.sun_path, pathname, sizeof(sun.sun_path));
- sun.sun_path[sizeof(sun.sun_path) - 1] = '\0';
-
- /* Unlink the old file if present */
- (void) unlink(pathname);
- ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun));
- if (ret < 0) {
- perror("bind");
- goto error;
- }
-
- return fd;
-
-error:
- return ret;
-}
-
-/*
- * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN.
- */
-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.
- */
-ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len)
-{
- struct msghdr msg = { 0 };
- struct iovec iov[1];
- ssize_t ret = -1;
-
- iov[0].iov_base = buf;
- iov[0].iov_len = len;
- msg.msg_iov = iov;
- msg.msg_iovlen = 1;
-
- ret = recvmsg(sock, &msg, 0);
- if (ret < 0) {
- perror("recvmsg");
- }
-
- return ret;
-}
-
-/*
- * Send buf data of size len. Using sendmsg API.
- *
- * Return the size of sent data.
- */
-ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len)
-{
- struct msghdr msg = { 0 };
- struct iovec iov[1];
- ssize_t ret = -1;
-
- iov[0].iov_base = buf;
- iov[0].iov_len = len;
- msg.msg_iov = iov;
- msg.msg_iovlen = 1;
-
- ret = sendmsg(sock, &msg, 0);
- if (ret < 0) {
- perror("sendmsg");
- }
-
- return ret;
-}
-
-/*
- * Shutdown cleanly a unix socket.
- */
-int lttcomm_close_unix_sock(int sock)
-{
- int ret;
-
- /* Shutdown receptions and transmissions */
- ret = shutdown(sock, SHUT_RDWR);
- if (ret < 0) {
- perror("shutdown");
- }
-
- return ret;
-}
-
-/*
- * Send a message accompanied by fd(s) over a unix socket.
- *
- * Returns the size of data sent, or negative error value.
- */
-ssize_t lttcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd)
-{
- struct msghdr msg = { 0 };
- 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;
-
- 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);
- 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;
-
- ret = sendmsg(sock, &msg, 0);
- if (ret < 0) {
- 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.
- */
-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);
- char recv_fd[CMSG_SPACE(sizeof_fds)];
- struct msghdr msg = { 0 };
- char dummy;
-
- /* Prepare to receive the structures */
- iov[0].iov_base = &dummy;
- iov[0].iov_len = 1;
- msg.msg_iov = iov;
- msg.msg_iovlen = 1;
- msg.msg_control = recv_fd;
- msg.msg_controllen = sizeof(recv_fd);
-
- ret = recvmsg(sock, &msg, 0);
- 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;
- }
- cmsg = CMSG_FIRSTHDR(&msg);
- if (!cmsg) {
- fprintf(stderr, "Error: Invalid control message header\n");
- ret = -1;
- goto end;
- }
- if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) {
- fprintf(stderr, "Didn't received any fd\n");
- ret = -1;
- goto end;
- }
- if (cmsg->cmsg_len != CMSG_LEN(sizeof_fds)) {
- fprintf(stderr, "Error: Received %zu bytes of ancillary data, expected %zu\n",
- cmsg->cmsg_len, CMSG_LEN(sizeof_fds));
- ret = -1;
- goto end;
- }
- memcpy(fds, CMSG_DATA(cmsg), sizeof_fds);
- ret = sizeof_fds;
-end:
- return ret;
-}
-
-/*
- * Send a message with credentials over a unix socket.
- *
- * Returns the size of data sent, or negative error value.
- */
-ssize_t lttcomm_send_creds_unix_sock(int sock, void *buf, size_t len)
-{
- struct msghdr msg = { 0 };
- struct cmsghdr *cmptr;
- struct iovec iov[1];
- ssize_t ret = -1;
- struct ucred *creds;
- size_t sizeof_cred = sizeof(struct ucred);
- char anc_buf[CMSG_SPACE(sizeof_cred)];
-
- iov[0].iov_base = buf;
- iov[0].iov_len = len;
- msg.msg_iov = iov;
- msg.msg_iovlen = 1;
-
- msg.msg_control = (caddr_t) anc_buf;
- msg.msg_controllen = CMSG_LEN(sizeof_cred);
-
- cmptr = CMSG_FIRSTHDR(&msg);
- cmptr->cmsg_level = SOL_SOCKET;
- cmptr->cmsg_type = SCM_CREDENTIALS;
- cmptr->cmsg_len = CMSG_LEN(sizeof_cred);
-
- creds = (struct ucred *) CMSG_DATA(cmptr);
-
- creds->uid = geteuid();
- creds->gid = getegid();
- creds->pid = getpid();
-
- ret = sendmsg(sock, &msg, 0);
- if (ret < 0) {
- perror("sendmsg");
- }
-
- return ret;
-}
-
-/*
- * Recv a message accompanied with credentials from a unix socket.
- *
- * Returns the size of received data, or negative error value.
- */
-ssize_t lttcomm_recv_creds_unix_sock(int sock, void *buf, size_t len,
- struct ucred *creds)
-{
- struct msghdr msg = { 0 };
- struct cmsghdr *cmptr;
- struct iovec iov[1];
- ssize_t ret;
- size_t sizeof_cred = sizeof(struct ucred);
- char anc_buf[CMSG_SPACE(sizeof_cred)];
-
- /* 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;
-
- msg.msg_control = anc_buf;
- msg.msg_controllen = sizeof(anc_buf);
-
- ret = recvmsg(sock, &msg, 0);
- if (ret < 0) {
- perror("recvmsg fds");
- goto end;
- }
-
- 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 != SCM_CREDENTIALS) {
- 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",
- cmptr->cmsg_len, CMSG_LEN(sizeof_cred));
- ret = -1;
- goto end;
- }
-
- memcpy(creds, CMSG_DATA(cmptr), sizeof_cred);
-
-end:
- return ret;
-}
-
-/*
- * Set socket option to use credentials passing.
- */
-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;
-}
projects / lttng-tools.git / blobdiff