+++ /dev/null
-/*
- * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
- * Copyright (C) 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; only
- * version 2.1 of the License.
- *
- * This library 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
- * Lesser General Public License for more details.
- *
- * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#define _GNU_SOURCE
-#include <limits.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/socket.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <sys/un.h>
-#include <unistd.h>
-#include <assert.h>
-#include <errno.h>
-#include <fcntl.h>
-
-#include <ust-comm.h>
-
-/*
- * Human readable error message.
- */
-static const char *ustcomm_readable_code[] = {
- [ USTCOMM_ERR_INDEX(USTCOMM_ERR) ] = "Unknown error",
- [ USTCOMM_ERR_INDEX(USTCOMM_UND) ] = "Undefined command",
- [ USTCOMM_ERR_INDEX(USTCOMM_NOT_IMPLEMENTED) ] = "Not implemented",
- [ USTCOMM_ERR_INDEX(USTCOMM_UNKNOWN_DOMAIN) ] = "Unknown tracing domain",
- [ USTCOMM_ERR_INDEX(USTCOMM_NO_SESSION) ] = "No session found",
- [ USTCOMM_ERR_INDEX(USTCOMM_LIST_FAIL) ] = "Unable to list traceable apps",
- [ USTCOMM_ERR_INDEX(USTCOMM_NO_APPS) ] = "No traceable apps found",
- [ USTCOMM_ERR_INDEX(USTCOMM_SESS_NOT_FOUND) ] = "Session name not found",
- [ USTCOMM_ERR_INDEX(USTCOMM_NO_TRACE) ] = "No trace found",
- [ USTCOMM_ERR_INDEX(USTCOMM_FATAL) ] = "Fatal error of the session daemon",
- [ USTCOMM_ERR_INDEX(USTCOMM_CREATE_FAIL) ] = "Create trace failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_START_FAIL) ] = "Start trace failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_STOP_FAIL) ] = "Stop trace failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_NO_TRACEABLE) ] = "App is not traceable",
- [ USTCOMM_ERR_INDEX(USTCOMM_SELECT_SESS) ] = "A session MUST be selected",
- [ USTCOMM_ERR_INDEX(USTCOMM_EXIST_SESS) ] = "Session name already exist",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_NA) ] = "UST tracer not available",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_EVENT_EXIST) ] = "UST event already exists",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_SESS_FAIL) ] = "UST create session failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_CHAN_FAIL) ] = "UST create channel failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_CHAN_NOT_FOUND) ] = "UST channel not found",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_CHAN_DISABLE_FAIL) ] = "Disable UST channel failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_CHAN_ENABLE_FAIL) ] = "Enable UST channel failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_CONTEXT_FAIL) ] = "Add UST context failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_ENABLE_FAIL) ] = "Enable UST event failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_DISABLE_FAIL) ] = "Disable UST event failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_META_FAIL) ] = "Opening metadata failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_START_FAIL) ] = "Starting UST trace failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_STOP_FAIL) ] = "Stoping UST trace failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_CONSUMER_FAIL) ] = "UST consumer start failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_STREAM_FAIL) ] = "UST create stream failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_DIR_FAIL) ] = "UST trace directory creation failed",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_DIR_EXIST) ] = "UST trace directory already exist",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_NO_SESSION) ] = "No UST session found",
- [ USTCOMM_ERR_INDEX(USTCOMM_KERN_LIST_FAIL) ] = "Listing UST events failed",
- [ USTCOMM_ERR_INDEX(USTCONSUMER_COMMAND_SOCK_READY) ] = "UST consumer command socket ready",
- [ USTCOMM_ERR_INDEX(USTCONSUMER_SUCCESS_RECV_FD) ] = "UST consumer success on receiving fds",
- [ USTCOMM_ERR_INDEX(USTCONSUMER_ERROR_RECV_FD) ] = "UST consumer error on receiving fds",
- [ USTCOMM_ERR_INDEX(USTCONSUMER_POLL_ERROR) ] = "UST consumer error in polling thread",
- [ USTCOMM_ERR_INDEX(USTCONSUMER_POLL_NVAL) ] = "UST consumer polling on closed fd",
- [ USTCOMM_ERR_INDEX(USTCONSUMER_POLL_HUP) ] = "UST consumer all fd hung up",
- [ USTCOMM_ERR_INDEX(USTCONSUMER_EXIT_SUCCESS) ] = "UST consumer exiting normally",
- [ USTCOMM_ERR_INDEX(USTCONSUMER_EXIT_FAILURE) ] = "UST consumer exiting on error",
- [ USTCOMM_ERR_INDEX(USTCONSUMER_OUTFD_ERROR) ] = "UST consumer error opening the tracefile",
- [ USTCOMM_ERR_INDEX(USTCONSUMER_SPLICE_EBADF) ] = "UST consumer splice EBADF",
- [ USTCOMM_ERR_INDEX(USTCONSUMER_SPLICE_EINVAL) ] = "UST consumer splice EINVAL",
- [ USTCOMM_ERR_INDEX(USTCONSUMER_SPLICE_ENOMEM) ] = "UST consumer splice ENOMEM",
- [ USTCOMM_ERR_INDEX(USTCONSUMER_SPLICE_ESPIPE) ] = "UST consumer splice ESPIPE",
- [ USTCOMM_ERR_INDEX(USTCOMM_NO_EVENT) ] = "Event not found",
-};
-
-/*
- * lttcom_get_readable_code
- *
- * Return ptr to string representing a human readable
- * error code from the ustcomm_return_code enum.
- */
-const char *ustcomm_get_readable_code(int code)
-{
- if (code == USTCOMM_OK) {
- return "Success";
- }
- if (code >= USTCOMM_ERR && code < USTCOMM_NR) {
- return ustcomm_readable_code[USTCOMM_ERR_INDEX(code)];
- }
- return strerror(code);
-}
-
-/*
- * ustcomm_connect_unix_sock
- *
- * Connect to unix socket using the path name.
- */
-int ustcomm_connect_unix_sock(const char *pathname)
-{
- struct sockaddr_un sun;
- int fd;
- int ret;
-
- /*
- * libust threads require the close-on-exec flag for all
- * resources so it does not leak file descriptors upon exec.
- */
- fd = socket(PF_UNIX, SOCK_STREAM, 0);
- if (fd < 0) {
- perror("socket");
- ret = fd;
- goto error;
- }
- ret = fcntl(fd, F_SETFD, FD_CLOEXEC);
- if (ret < 0) {
- perror("fcntl");
- goto error_fcntl;
- }
-
- 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:
-error_fcntl:
- close(fd);
-error:
- return ret;
-}
-
-/*
- * ustcomm_accept_unix_sock
- *
- * Do an accept(2) on the sock and return the
- * new file descriptor. The socket MUST be bind(2) before.
- */
-int ustcomm_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");
- goto error;
- }
-
- return new_fd;
-
-error:
- return -1;
-}
-
-/*
- * ustcomm_create_unix_sock
- *
- * Creates a AF_UNIX local socket using pathname
- * bind the socket upon creation and return the fd.
- */
-int ustcomm_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;
-}
-
-/*
- * ustcomm_listen_unix_sock
- *
- * Make the socket listen using LTTNG_UST_COMM_MAX_LISTEN.
- */
-int ustcomm_listen_unix_sock(int sock)
-{
- int ret;
-
- ret = listen(sock, LTTNG_UST_COMM_MAX_LISTEN);
- if (ret < 0) {
- perror("listen");
- }
-
- return ret;
-}
-
-/*
- * ustcomm_recv_unix_sock
- *
- * Receive data of size len in put that data into
- * the buf param. Using recvmsg API.
- * Return the size of received data.
- */
-ssize_t ustcomm_recv_unix_sock(int sock, void *buf, size_t len)
-{
- struct msghdr msg;
- struct iovec iov[1];
- ssize_t ret = -1;
-
- memset(&msg, 0, sizeof(msg));
-
- 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;
-}
-
-/*
- * ustcomm_send_unix_sock
- *
- * Send buf data of size len. Using sendmsg API.
- * Return the size of sent data.
- */
-ssize_t ustcomm_send_unix_sock(int sock, void *buf, size_t len)
-{
- struct msghdr msg;
- struct iovec iov[1];
- ssize_t ret = -1;
-
- memset(&msg, 0, sizeof(msg));
-
- iov[0].iov_base = buf;
- iov[0].iov_len = len;
- msg.msg_iov = iov;
- msg.msg_iovlen = 1;
-
- /*
- * Using the MSG_NOSIGNAL when sending data from sessiond to
- * libust, so libust does not receive an unhandled SIGPIPE or
- * SIGURG. The sessiond receiver side can be made more resilient
- * by ignoring SIGPIPE, but we don't have this luxury on the
- * libust side.
- */
- ret = sendmsg(sock, &msg, MSG_NOSIGNAL);
- if (ret < 0) {
- perror("sendmsg");
- }
-
- return ret;
-}
-
-/*
- * ustcomm_close_unix_sock
- *
- * Shutdown cleanly a unix socket.
- */
-int ustcomm_close_unix_sock(int sock)
-{
- int ret;
-
- /* Shutdown receptions and transmissions */
- ret = shutdown(sock, SHUT_RDWR);
- if (ret < 0) {
- perror("shutdown");
- }
-
- return ret;
-}
-
-/*
- * ustcomm_send_fds_unix_sock
- *
- * Send multiple fds on a unix socket.
- */
-ssize_t ustcomm_send_fds_unix_sock(int sock, void *buf, int *fds, size_t nb_fd, size_t len)
-{
- 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)];
-
- memset(&msg, 0, sizeof(msg));
-
- /*
- * Note: the consumerd receiver only supports receiving one FD per
- * message.
- */
- assert(nb_fd == 1);
-
- 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 = 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;
-}
-
-int ustcomm_send_app_msg(int sock, struct ustcomm_ust_msg *lum)
-{
- ssize_t len;
-
- len = ustcomm_send_unix_sock(sock, lum, sizeof(*lum));
- switch (len) {
- case sizeof(*lum):
- break;
- case -1:
- if (errno == ECONNRESET) {
- fprintf(stderr, "remote end closed connection\n");
- return 0;
- }
- return -1;
- default:
- fprintf(stderr, "incorrect message size: %zd\n", len);
- return -1;
- }
- return 0;
-}
-
-int ustcomm_recv_app_reply(int sock, struct ustcomm_ust_reply *lur,
- uint32_t expected_handle, uint32_t expected_cmd)
-{
- ssize_t len;
-
- memset(lur, 0, sizeof(*lur));
- len = ustcomm_recv_unix_sock(sock, lur, sizeof(*lur));
- switch (len) {
- case 0: /* orderly shutdown */
- return -EINVAL;
- case sizeof(*lur):
- if (lur->handle != expected_handle) {
- fprintf(stderr, "Unexpected result message handle\n");
- return -EINVAL;
- }
-
- if (lur->cmd != expected_cmd) {
- fprintf(stderr, "Unexpected result message command\n");
- return -EINVAL;
- }
- if (lur->ret_code != USTCOMM_OK) {
- /*
- * Some errors are normal.. we should put this
- * in a debug level message...
- * fprintf(stderr, "remote operation failed with code %d.\n",
- * lur->ret_code);
- */
- return lur->ret_code;
- }
- return 0;
- case -1:
- if (errno == ECONNRESET) {
- fprintf(stderr, "remote end closed connection\n");
- return -EINVAL;
- }
- return -1;
- default:
- fprintf(stderr, "incorrect message size: %zd\n", len);
- return len > 0 ? -1 : len;
- }
-}
-
-int ustcomm_send_app_cmd(int sock,
- struct ustcomm_ust_msg *lum,
- struct ustcomm_ust_reply *lur)
-{
- int ret;
-
- ret = ustcomm_send_app_msg(sock, lum);
- if (ret)
- return ret;
- ret = ustcomm_recv_app_reply(sock, lur, lum->handle, lum->cmd);
- if (ret)
- return ret;
- return 0;
-}
-
-
-/*
- * Receives a single fd from socket.
- *
- * Returns the size of received data
- */
-int ustcomm_recv_fd(int sock)
-{
- struct iovec iov[1];
- int ret = 0;
- int data_fd;
- struct cmsghdr *cmsg;
- char recv_fd[CMSG_SPACE(sizeof(int))];
- struct msghdr msg;
- union {
- unsigned char vc[4];
- int vi;
- } tmp;
- int i;
-
- memset(&msg, 0, sizeof(msg));
-
- /* Prepare to receive the structures */
- iov[0].iov_base = &data_fd;
- iov[0].iov_len = sizeof(data_fd);
- msg.msg_iov = iov;
- msg.msg_iovlen = 1;
- msg.msg_control = recv_fd;
- msg.msg_controllen = sizeof(recv_fd);
-
- if ((ret = recvmsg(sock, &msg, 0)) < 0) {
- perror("recvmsg");
- goto end;
- }
- if (ret != sizeof(data_fd)) {
- fprintf(stderr, "Received %d bytes, expected %zd", ret, sizeof(data_fd));
- goto end;
- }
- cmsg = CMSG_FIRSTHDR(&msg);
- if (!cmsg) {
- fprintf(stderr, "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;
- }
- /* this is our fd */
- for (i = 0; i < sizeof(int); i++)
- tmp.vc[i] = CMSG_DATA(cmsg)[i];
- ret = tmp.vi;
- /*
- * Useful for fd leak debug.
- * fprintf(stderr, "received fd %d\n", ret);
- */
-end:
- return ret;
-}
projects / lttng-ust.git / blobdiff