X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Fsessiond-comm%2Fsessiond-comm.c;h=891f532d669ec890a947d898ff41fd59edf94cfb;hp=3b224c6ff76e7414c7e140b955bdb27c16d60e8e;hb=0d37f2bce95a09b86a1afde525c429d0ae7d19e9;hpb=67cf0ab7b6d900a208d5d5ec6b348422527b1971 diff --git a/src/common/sessiond-comm/sessiond-comm.c b/src/common/sessiond-comm/sessiond-comm.c index 3b224c6ff..891f532d6 100644 --- a/src/common/sessiond-comm/sessiond-comm.c +++ b/src/common/sessiond-comm/sessiond-comm.c @@ -2,18 +2,18 @@ * 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 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., 59 Temple - * Place - Suite 330, Boston, MA 02111-1307, USA. + * 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 _GNU_SOURCE @@ -28,6 +28,7 @@ #include #include +#include #include "sessiond-comm.h" @@ -59,6 +60,7 @@ static const char *lttcomm_readable_code[] = { [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_VERSION) ] = "Kernel tracer version is not compatible", [ 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_EXIST) ] = "Kernel channel already exists", [ 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", @@ -100,6 +102,11 @@ static const char *lttcomm_readable_code[] = { [ 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(LTTCOMM_UST_CONTEXT_INVAL)] = "UST invalid context", + [ LTTCOMM_ERR_INDEX(LTTCOMM_NEED_ROOT_SESSIOND) ] = "Tracing the kernel requires a root lttng-sessiond daemon and \"tracing\" group user membership", + [ LTTCOMM_ERR_INDEX(LTTCOMM_TRACE_ALREADY_STARTED) ] = "Tracing already started", + [ LTTCOMM_ERR_INDEX(LTTCOMM_TRACE_ALREADY_STOPPED) ] = "Tracing already stopped", + [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_EVENT_ENOSYS) ] = "Kernel event type not supported", + [ 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", @@ -115,6 +122,9 @@ static const char *lttcomm_readable_code[] = { [ 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", + [ LTTCOMM_ERR_INDEX(LTTCOMM_INVALID) ] = "Invalid parameter", + [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_USTCONSUMERD) ] = "No UST consumer detected", + [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_KERNCONSUMERD) ] = "No kernel consumer detected", }; /* @@ -133,450 +143,3 @@ const char *lttcomm_get_readable_code(enum lttcomm_return_code 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; - 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, MSG_WAITALL); - 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; - 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 = 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"); - } - - close(sock); - - 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; - 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)); - - 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; - 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; - 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", - (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; -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; - 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; -#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); - 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__ */ - - 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, - lttng_sock_cred *creds) -{ - struct msghdr msg; - struct iovec iov[1]; - ssize_t ret; -#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__ */ - - ret = recvmsg(sock, &msg, 0); - if (ret < 0) { - perror("recvmsg fds"); - goto end; - } - -#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__) - { - 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__ -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__) -int lttcomm_setsockopt_creds_unix_sock(int sock) -{ - return 0; -} -#else -#error "Please implement credential support for your OS." -#endif /* __linux__ */