X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=liblttng-sessiond-comm%2Flttng-sessiond-comm.c;h=483b346d6692072513f3d59a0f79332b00d1a587;hp=3c066cd3b9d5c01eb0b7b3d5f84a81feca4982cf;hb=7bd3904781fa78155c13952f5d5cb9ab42f44a08;hpb=2b0bf86429e59691e549be8a1fee6aa72879c502 diff --git a/liblttng-sessiond-comm/lttng-sessiond-comm.c b/liblttng-sessiond-comm/lttng-sessiond-comm.c index 3c066cd3b..483b346d6 100644 --- a/liblttng-sessiond-comm/lttng-sessiond-comm.c +++ b/liblttng-sessiond-comm/lttng-sessiond-comm.c @@ -1,19 +1,19 @@ /* - * Copyright (C) 2011 - David Goulet + * 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 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. + * 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., 59 Temple + * Place - Suite 330, Boston, MA 02111-1307, USA. */ #define _GNU_SOURCE @@ -22,11 +22,11 @@ #include #include #include -#include #include #include #include #include +#include #include @@ -53,6 +53,7 @@ static const char *lttcomm_readable_code[] = { [ 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", @@ -73,32 +74,49 @@ static const char *lttcomm_readable_code[] = { [ 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_NOT_FOUND) ] = "UST channel not found", [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_FAIL) ] = "UST create channel failed", - [ LTTCOMM_ERR_INDEX(KCONSUMERD_COMMAND_SOCK_READY) ] = "Kconsumerd command socket ready", - [ LTTCOMM_ERR_INDEX(KCONSUMERD_SUCCESS_RECV_FD) ] = "Kconsumerd success on receiving fds", - [ LTTCOMM_ERR_INDEX(KCONSUMERD_ERROR_RECV_FD) ] = "Kconsumerd error on receiving fds", - [ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_ERROR) ] = "Kconsumerd error in polling thread", - [ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_NVAL) ] = "Kconsumerd polling on closed fd", - [ LTTCOMM_ERR_INDEX(KCONSUMERD_POLL_HUP) ] = "Kconsumerd all fd hung up", - [ LTTCOMM_ERR_INDEX(KCONSUMERD_EXIT_SUCCESS) ] = "Kconsumerd exiting normally", - [ LTTCOMM_ERR_INDEX(KCONSUMERD_EXIT_FAILURE) ] = "Kconsumerd exiting on error", - [ LTTCOMM_ERR_INDEX(KCONSUMERD_OUTFD_ERROR) ] = "Kconsumerd error opening the tracefile", - [ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_EBADF) ] = "Kconsumerd splice EBADF", - [ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_EINVAL) ] = "Kconsumerd splice EINVAL", - [ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_ENOMEM) ] = "Kconsumerd splice ENOMEM", - [ LTTCOMM_ERR_INDEX(KCONSUMERD_SPLICE_ESPIPE) ] = "Kconsumerd splice ESPIPE", + [ 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", }; /* - * lttcom_get_readable_code + * Return ptr to string representing a human readable error code from the + * lttcomm_return_code enum. * - * 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. + * 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) { @@ -112,9 +130,7 @@ const char *lttcomm_get_readable_code(enum lttcomm_return_code code) } /* - * lttcomm_connect_unix_sock - * - * Connect to unix socket using the path name. + * Connect to unix socket using the path name. */ int lttcomm_connect_unix_sock(const char *pathname) { @@ -137,9 +153,8 @@ int lttcomm_connect_unix_sock(const char *pathname) 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. + * Don't print message on connect error, because connect is used in + * normal execution to detect if sessiond is alive. */ goto error_connect; } @@ -153,10 +168,8 @@ error: } /* - * lttcomm_accept_unix_sock - * - * Do an accept(2) on the sock and return the - * new file descriptor. The socket MUST be bind(2) before. + * 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) { @@ -168,20 +181,14 @@ int lttcomm_accept_unix_sock(int sock) new_fd = accept(sock, (struct sockaddr *) &sun, &len); if (new_fd < 0) { perror("accept"); - goto error; } return new_fd; - -error: - return -1; } /* - * lttcomm_create_unix_sock - * - * Creates a AF_UNIX local socket using pathname - * bind the socket upon creation and return the 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) { @@ -215,15 +222,13 @@ error: } /* - * lttcomm_listen_unix_sock - * - * Make the socket listen using MAX_LISTEN. + * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN. */ int lttcomm_listen_unix_sock(int sock) { int ret; - ret = listen(sock, MAX_LISTEN); + ret = listen(sock, LTTNG_SESSIOND_COMM_MAX_LISTEN); if (ret < 0) { perror("listen"); } @@ -232,11 +237,10 @@ int lttcomm_listen_unix_sock(int sock) } /* - * lttcomm_recv_unix_sock + * Receive data of size len in put that data into the buf param. Using recvmsg + * API. * - * Receive data of size len in put that data into - * the buf param. Using recvmsg API. - * Return the size of received data. + * Return the size of received data. */ ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len) { @@ -258,10 +262,9 @@ ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len) } /* - * lttcomm_send_unix_sock + * Send buf data of size len. Using sendmsg API. * - * Send buf data of size len. Using sendmsg API. - * Return the size of sent data. + * Return the size of sent data. */ ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len) { @@ -283,9 +286,7 @@ ssize_t lttcomm_send_unix_sock(int sock, void *buf, size_t len) } /* - * lttcomm_close_unix_sock - * - * Shutdown cleanly a unix socket. + * Shutdown cleanly a unix socket. */ int lttcomm_close_unix_sock(int sock) { @@ -301,11 +302,11 @@ int lttcomm_close_unix_sock(int sock) } /* - * lttcomm_send_fds_unix_sock + * Send a message accompanied by fd(s) over a unix socket. * - * Send multiple fds on a unix socket. + * Returns the size of data sent, or negative error value. */ -ssize_t lttcomm_send_fds_unix_sock(int sock, void *buf, int *fds, size_t nb_fd, size_t len) +ssize_t lttcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd) { struct msghdr msg = { 0 }; struct cmsghdr *cmptr; @@ -313,12 +314,10 @@ ssize_t lttcomm_send_fds_unix_sock(int sock, void *buf, int *fds, size_t nb_fd, ssize_t ret = -1; unsigned int sizeof_fds = nb_fd * sizeof(int); char tmp[CMSG_SPACE(sizeof_fds)]; + char dummy = 0; - /* - * Note: the consumerd receiver only supports receiving one FD per - * message. - */ - assert(nb_fd == 1); + if (nb_fd > LTTCOMM_MAX_SEND_FDS) + return -EINVAL; msg.msg_control = (caddr_t)tmp; msg.msg_controllen = CMSG_LEN(sizeof_fds); @@ -331,11 +330,116 @@ ssize_t lttcomm_send_fds_unix_sock(int sock, void *buf, int *fds, size_t nb_fd, /* 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"); @@ -343,3 +447,88 @@ ssize_t lttcomm_send_fds_unix_sock(int sock, void *buf, int *fds, size_t nb_fd, 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; +}