+++ /dev/null
-/*
- * Copyright (C) 2012 David Goulet <dgoulet@efficios.com>
- *
- * SPDX-License-Identifier: GPL-2.0-only
- *
- */
-
-#define _LGPL_SOURCE
-#include <limits.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <common/compat/time.h>
-#include <poll.h>
-
-#include <common/common.h>
-#include <common/time.h>
-#include <common/compat/errno.h>
-
-#include "inet.h"
-
-#define RECONNECT_DELAY 200 /* ms */
-
-/*
- * INET protocol operations.
- */
-static const struct lttcomm_proto_ops inet_ops = {
- .bind = lttcomm_bind_inet_sock,
- .close = lttcomm_close_inet_sock,
- .connect = lttcomm_connect_inet_sock,
- .accept = lttcomm_accept_inet_sock,
- .listen = lttcomm_listen_inet_sock,
- .recvmsg = lttcomm_recvmsg_inet_sock,
- .sendmsg = lttcomm_sendmsg_inet_sock,
-};
-
-unsigned long lttcomm_inet_tcp_timeout;
-
-/*
- * Creates an PF_INET socket.
- */
-int lttcomm_create_inet_sock(struct lttcomm_sock *sock, int type, int proto)
-{
- int val = 1, ret;
- unsigned long timeout;
-
- /* Create server socket */
- if ((sock->fd = socket(PF_INET, type, proto)) < 0) {
- PERROR("socket inet");
- goto error;
- }
-
- sock->ops = &inet_ops;
-
- /*
- * Set socket option to reuse the address.
- */
- ret = setsockopt(sock->fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(int));
- if (ret < 0) {
- PERROR("setsockopt inet");
- goto error;
- }
- timeout = lttcomm_get_network_timeout();
- if (timeout) {
- ret = lttcomm_setsockopt_rcv_timeout(sock->fd, timeout);
- if (ret) {
- goto error;
- }
- ret = lttcomm_setsockopt_snd_timeout(sock->fd, timeout);
- if (ret) {
- goto error;
- }
- }
-
- return 0;
-
-error:
- return -1;
-}
-
-/*
- * Bind socket and return.
- */
-int lttcomm_bind_inet_sock(struct lttcomm_sock *sock)
-{
- struct sockaddr_in sockaddr = sock->sockaddr.addr.sin;
-
- return bind(sock->fd, &sockaddr, sizeof(sockaddr));
-}
-
-static
-int connect_no_timeout(struct lttcomm_sock *sock)
-{
- struct sockaddr_in sockaddr = sock->sockaddr.addr.sin;
-
- return connect(sock->fd, &sockaddr, sizeof(sockaddr));
-}
-
-static
-int connect_with_timeout(struct lttcomm_sock *sock)
-{
- unsigned long timeout = lttcomm_get_network_timeout();
- int ret, flags, connect_ret;
- struct timespec orig_time, cur_time;
- unsigned long diff_ms;
- struct sockaddr_in sockaddr;
-
- ret = fcntl(sock->fd, F_GETFL, 0);
- if (ret == -1) {
- PERROR("fcntl");
- return -1;
- }
- flags = ret;
-
- /* Set socket to nonblock */
- ret = fcntl(sock->fd, F_SETFL, flags | O_NONBLOCK);
- if (ret == -1) {
- PERROR("fcntl");
- return -1;
- }
-
- ret = lttng_clock_gettime(CLOCK_MONOTONIC, &orig_time);
- if (ret == -1) {
- PERROR("clock_gettime");
- return -1;
- }
-
- sockaddr = sock->sockaddr.addr.sin;
- connect_ret = connect(sock->fd, &sockaddr, sizeof(sockaddr));
- if (connect_ret == -1 && errno != EAGAIN && errno != EWOULDBLOCK &&
- errno != EINPROGRESS) {
- goto error;
- } else if (!connect_ret) {
- /* Connect succeeded */
- goto success;
- }
-
- DBG("Asynchronous connect for sock %d, performing polling with"
- " timeout: %lums", sock->fd, timeout);
- /*
- * Perform poll loop following EINPROGRESS recommendation from
- * connect(2) man page.
- */
- do {
- struct pollfd fds;
-
- fds.fd = sock->fd;
- fds.events = POLLOUT;
- fds.revents = 0;
- ret = poll(&fds, 1, RECONNECT_DELAY);
- if (ret < 0) {
- goto error;
- } else if (ret > 0) {
- int optval;
- socklen_t optval_len = sizeof(optval);
-
- if (!(fds.revents & POLLOUT)) {
- /* Either hup or error */
- errno = EPIPE;
- goto error;
- }
- /* got something */
- ret = getsockopt(sock->fd, SOL_SOCKET,
- SO_ERROR, &optval, &optval_len);
- if (ret) {
- PERROR("getsockopt");
- goto error;
- }
- if (!optval) {
- connect_ret = 0;
- goto success;
- } else {
- /* Get actual connect() errno from opt_val */
- errno = optval;
- goto error;
- }
- }
- /* ret == 0: timeout */
- ret = lttng_clock_gettime(CLOCK_MONOTONIC, &cur_time);
- if (ret == -1) {
- PERROR("clock_gettime");
- connect_ret = ret;
- goto error;
- }
- if (timespec_to_ms(timespec_abs_diff(cur_time, orig_time), &diff_ms) < 0) {
- ERR("timespec_to_ms input overflows milliseconds output");
- connect_ret = -1;
- goto error;
- }
- } while (diff_ms < timeout);
-
- /* Timeout */
- errno = ETIMEDOUT;
- connect_ret = -1;
-
-success:
- /* Restore initial flags */
- ret = fcntl(sock->fd, F_SETFL, flags);
- if (ret == -1) {
- PERROR("fcntl");
- /* Continue anyway */
- }
-error:
- return connect_ret;
-}
-
-/*
- * Connect PF_INET socket.
- */
-int lttcomm_connect_inet_sock(struct lttcomm_sock *sock)
-{
- int ret, closeret;
-
- if (lttcomm_get_network_timeout()) {
- ret = connect_with_timeout(sock);
- } else {
- ret = connect_no_timeout(sock);
- }
- if (ret < 0) {
- PERROR("connect");
- goto error_connect;
- }
-
- return ret;
-
-error_connect:
- closeret = close(sock->fd);
- if (closeret) {
- PERROR("close inet");
- }
-
- return ret;
-}
-
-/*
- * Do an accept(2) on the sock and return the new lttcomm socket. The socket
- * MUST be bind(2) before.
- */
-struct lttcomm_sock *lttcomm_accept_inet_sock(struct lttcomm_sock *sock)
-{
- int new_fd;
- socklen_t len;
- struct lttcomm_sock *new_sock;
- unsigned long timeout;
- struct sockaddr_in new_addr = {};
-
- if (sock->proto == LTTCOMM_SOCK_UDP) {
- /*
- * accept(2) does not exist for UDP so simply return the passed socket.
- */
- new_sock = sock;
- goto end;
- }
-
- new_sock = lttcomm_alloc_sock(sock->proto);
- if (new_sock == NULL) {
- goto error;
- }
-
- len = sizeof(new_addr);
-
- /* Blocking call */
- new_fd = accept(sock->fd, (struct sockaddr *) &new_addr, &len);
- if (new_fd < 0) {
- PERROR("accept inet");
- goto error;
- }
- new_sock->sockaddr.addr.sin = new_addr;
- timeout = lttcomm_get_network_timeout();
- if (timeout) {
- int ret;
-
- ret = lttcomm_setsockopt_rcv_timeout(new_fd, timeout);
- if (ret) {
- goto error_close;
- }
- ret = lttcomm_setsockopt_snd_timeout(new_fd, timeout);
- if (ret) {
- goto error_close;
- }
- }
-
- new_sock->fd = new_fd;
- new_sock->ops = &inet_ops;
-
-end:
- return new_sock;
-
-error_close:
- if (close(new_fd) < 0) {
- PERROR("accept inet close fd");
- }
-
-error:
- free(new_sock);
- return NULL;
-}
-
-/*
- * Make the socket listen using LTTNG_SESSIOND_COMM_MAX_LISTEN.
- */
-int lttcomm_listen_inet_sock(struct lttcomm_sock *sock, int backlog)
-{
- int ret;
-
- if (sock->proto == LTTCOMM_SOCK_UDP) {
- /* listen(2) does not exist for UDP so simply return success. */
- ret = 0;
- goto end;
- }
-
- /* Default listen backlog */
- if (backlog <= 0) {
- backlog = LTTNG_SESSIOND_COMM_MAX_LISTEN;
- }
-
- ret = listen(sock->fd, backlog);
- if (ret < 0) {
- PERROR("listen inet");
- }
-
-end:
- 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_recvmsg_inet_sock(struct lttcomm_sock *sock, void *buf,
- size_t len, int flags)
-{
- struct msghdr msg;
- struct iovec iov[1];
- ssize_t ret = -1;
- size_t len_last;
- struct sockaddr_in addr = sock->sockaddr.addr.sin;
-
- memset(&msg, 0, sizeof(msg));
-
- iov[0].iov_base = buf;
- iov[0].iov_len = len;
- msg.msg_iov = iov;
- msg.msg_iovlen = 1;
-
- msg.msg_name = (struct sockaddr *) &addr;
- msg.msg_namelen = sizeof(sock->sockaddr.addr.sin);
-
- do {
- len_last = iov[0].iov_len;
- ret = recvmsg(sock->fd, &msg, flags);
- if (ret > 0) {
- if (flags & MSG_DONTWAIT) {
- goto end;
- }
- iov[0].iov_base += ret;
- iov[0].iov_len -= ret;
- LTTNG_ASSERT(ret <= len_last);
- }
- } while ((ret > 0 && ret < len_last) || (ret < 0 && errno == EINTR));
-
- if (ret < 0) {
- if (errno == EAGAIN && flags & MSG_DONTWAIT) {
- /*
- * EAGAIN is expected in non-blocking mode and should
- * not be reported as an error. Moreover, if no data
- * was read, 0 must not be returned as it would be
- * interpreted as an orderly shutdown of the socket.
- */
- goto end;
- }
- PERROR("recvmsg inet");
- } else if (ret > 0) {
- ret = len;
- }
- /* Else ret = 0 meaning an orderly shutdown. */
-end:
- return ret;
-}
-
-/*
- * Send buf data of size len. Using sendmsg API.
- *
- * Return the size of sent data.
- */
-ssize_t lttcomm_sendmsg_inet_sock(struct lttcomm_sock *sock, const void *buf,
- size_t len, int flags)
-{
- struct msghdr msg;
- struct iovec iov[1];
- ssize_t ret = -1;
-
- memset(&msg, 0, sizeof(msg));
-
- iov[0].iov_base = (void *) buf;
- iov[0].iov_len = len;
- msg.msg_iov = iov;
- msg.msg_iovlen = 1;
-
- switch (sock->proto) {
- case LTTCOMM_SOCK_UDP:
- {
- struct sockaddr_in addr = sock->sockaddr.addr.sin;
-
- msg.msg_name = (struct sockaddr *) &addr;
- msg.msg_namelen = sizeof(sock->sockaddr.addr.sin);
- break;
- }
- default:
- break;
- }
-
- do {
- ret = sendmsg(sock->fd, &msg, flags);
- } 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 inet");
- }
- }
-
- return ret;
-}
-
-/*
- * Shutdown cleanly and close.
- */
-int lttcomm_close_inet_sock(struct lttcomm_sock *sock)
-{
- int ret;
-
- /* Don't try to close an invalid marked socket */
- if (sock->fd == -1) {
- return 0;
- }
-
- ret = close(sock->fd);
- if (ret) {
- PERROR("close inet");
- }
-
- /* Mark socket */
- sock->fd = -1;
-
- return ret;
-}
-
-/*
- * Return value read from /proc or else 0 if value is not found.
- */
-static unsigned long read_proc_value(const char *path)
-{
- int ret, fd;
- ssize_t size_ret;
- long r_val;
- unsigned long val = 0;
- char buf[64];
-
- fd = open(path, O_RDONLY);
- if (fd < 0) {
- goto error;
- }
-
- size_ret = lttng_read(fd, buf, sizeof(buf));
- /*
- * Allow reading a file smaller than buf, but keep space for
- * final \0.
- */
- if (size_ret < 0 || size_ret >= sizeof(buf)) {
- PERROR("read proc failed");
- goto error_close;
- }
- buf[size_ret] = '\0';
-
- errno = 0;
- r_val = strtol(buf, NULL, 10);
- if (errno != 0 || r_val < -1L) {
- val = 0;
- goto error_close;
- } else {
- if (r_val > 0) {
- val = r_val;
- }
- }
-
-error_close:
- ret = close(fd);
- if (ret) {
- PERROR("close /proc value");
- }
-error:
- return val;
-}
-
-void lttcomm_inet_init(void)
-{
- unsigned long syn_retries, fin_timeout, syn_timeout, env;
-
- env = lttcomm_get_network_timeout();
- if (env) {
- lttcomm_inet_tcp_timeout = env;
- goto end;
- }
-
- /* Assign default value and see if we can change it. */
- lttcomm_inet_tcp_timeout = DEFAULT_INET_TCP_TIMEOUT;
-
- syn_retries = read_proc_value(LTTCOMM_INET_PROC_SYN_RETRIES_PATH);
- fin_timeout = read_proc_value(LTTCOMM_INET_PROC_FIN_TIMEOUT_PATH);
-
- syn_timeout = syn_retries * LTTCOMM_INET_SYN_TIMEOUT_FACTOR;
-
- /*
- * Get the maximum between the two possible timeout value and use that to
- * get the maximum with the default timeout.
- */
- lttcomm_inet_tcp_timeout = max_t(unsigned long,
- max_t(unsigned long, syn_timeout, fin_timeout),
- lttcomm_inet_tcp_timeout);
-
-end:
- DBG("TCP inet operation timeout set to %lu sec", lttcomm_inet_tcp_timeout);
-}
projects / lttng-tools.git / blobdiff