X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=liblttng-sessiond-comm%2Flttng-sessiond-comm.c;fp=liblttng-sessiond-comm%2Flttng-sessiond-comm.c;h=0000000000000000000000000000000000000000;hp=483b346d6692072513f3d59a0f79332b00d1a587;hb=10a8a2237343699e3923d87e24dbf2d7fe225377;hpb=734f79bf717d87817623d382c59086dc9e8ef610 diff --git a/liblttng-sessiond-comm/lttng-sessiond-comm.c b/liblttng-sessiond-comm/lttng-sessiond-comm.c deleted file mode 100644 index 483b346d6..000000000 --- a/liblttng-sessiond-comm/lttng-sessiond-comm.c +++ /dev/null @@ -1,534 +0,0 @@ -/* - * Copyright (C) 2011 - David Goulet - * Mathieu Desnoyers - * - * 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 -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include - -/* - * 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; -}