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, ret, closeret;
-
- 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:
- closeret = close(fd);
- if (closeret) {
- PERROR("close");
- }
-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;
-
- do {
- ret = recvmsg(sock, &msg, MSG_WAITALL);
- } while (ret < 0 && errno == EINTR);
- 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) {
- /*
- * Only warn about EPIPE when quiet mode is deactivated.
- * We consider EPIPE as expected.
- */
- if (errno != EPIPE || !lttng_opt_quiet) {
- PERROR("sendmsg");
- }
- }
-
- return ret;
-}
-
-/*
- * Shutdown cleanly a unix socket.
- */
-int lttcomm_close_unix_sock(int sock)
-{
- int ret, closeret;
-
- /* Shutdown receptions and transmissions */
- ret = shutdown(sock, SHUT_RDWR);
- if (ret < 0) {
- PERROR("shutdown");
- }
-
- closeret = close(sock);
- if (closeret) {
- PERROR("close");
- }
-
- 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;
-
- do {
- ret = sendmsg(sock, &msg, 0);
- } while (ret < 0 && errno == EINTR);
- if (ret < 0) {
- /*
- * Only warn about EPIPE when quiet mode is deactivated.
- * We consider EPIPE as expected.
- */
- if (errno != EPIPE || !lttng_opt_quiet) {
- 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);
-
- do {
- ret = recvmsg(sock, &msg, 0);
- } while (ret < 0 && errno == EINTR);
- 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__ */
-
- do {
- ret = sendmsg(sock, &msg, 0);
- } while (ret < 0 && errno == EINTR);
- if (ret < 0) {
- /*
- * Only warn about EPIPE when quiet mode is deactivated.
- * We consider EPIPE as expected.
- */
- if (errno != EPIPE || !lttng_opt_quiet) {
- 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__ */
-
- do {
- ret = recvmsg(sock, &msg, 0);
- } while (ret < 0 && errno == EINTR);
- 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__) || defined(__CYGWIN__))
- {
- 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__) || defined(__CYGWIN__))
-int lttcomm_setsockopt_creds_unix_sock(int sock)
-{
- return 0;
-}
-#else
-#error "Please implement credential support for your OS."
-#endif /* __linux__ */
projects / lttng-tools.git / blobdiff