From 5e9d03d507aad324a803eb8795e0eed6fb671761 Mon Sep 17 00:00:00 2001
From: guowenxue <guowenxue@gmail.com>
Date: Mon, 10 Jul 2023 15:24:52 +0800
Subject: [PATCH] Merge branch 'master' of http://master.iot-yun.club:8088/r/raspberrypi
---
apue/project_socket/src/socket.c | 515 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 515 insertions(+), 0 deletions(-)
diff --git a/apue/project_socket/src/socket.c b/apue/project_socket/src/socket.c
new file mode 100644
index 0000000..e6231e3
--- /dev/null
+++ b/apue/project_socket/src/socket.c
@@ -0,0 +1,515 @@
+/********************************************************************************
+ * Copyright: (C) 2022 LingYun IoT System Studio
+ * All rights reserved.
+ *
+ * Filename: socket.c
+ * Description: This file is for socket API functions
+ *
+ * Version: 1.0.0(18/04/22)
+ * Author: Guo Wenxue <guowenxue@gmail.com>
+ * ChangeLog: 1, Release initial version on "18/04/22 17:09:59"
+ *
+ ********************************************************************************/
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <netdb.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/un.h>
+#include <poll.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <linux/sockios.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <arpa/inet.h>
+#include <sys/resource.h>
+
+#include "socket.h"
+#include "logger.h"
+
+/* description: initial socket context
+ * input args:
+ * $sock: socket context pointer
+ * $host: connect server hostname for client mode, unused for server mode
+ * $port: connect server port for client mode or listen port for server mode
+ * return value: <0: failure 0:ok
+ */
+int socket_init(socket_ctx_t *sock, char *host, int port)
+{
+ if( !sock || port<=0 )
+ return -1;
+
+ memset( sock, 0, sizeof(*sock) );
+ sock->fd = -1;
+ sock->port = port;
+ if( host ) /* server no need it */
+ strncpy(sock->host, host, HOSTNAME_LEN);
+}
+
+/* description: close socket
+ * input args:
+ * $sock: socket context pointer
+ * return value: <0: failure 0:ok
+ */
+int socket_term(socket_ctx_t *sock)
+{
+ if( !sock )
+ return -1;
+
+ if( sock->fd > 0)
+ {
+ close(sock->fd);
+ sock->fd = -1;
+ }
+
+ return 0;
+}
+
+/* description: socket server start listen
+ * input args:
+ * $sock: socket context pointer
+ * return value: <0: failure 0:ok
+ */
+int socket_listen(socket_ctx_t *sock)
+{
+ int rv = 0;
+ struct sockaddr_in addr;
+ int backlog = 13;
+
+ if( !sock )
+ return -1;
+
+ set_socket_rlimit(); /* set max open socket count */
+}
+
+/* description: socket connect to server in block mode
+ * input args:
+ * $sock: socket context pointer
+ * return value: <0: failure 0:ok
+ */
+int socket_connect(socket_ctx_t *sock)
+{
+ int rv = 0;
+ int sockfd = 0;
+ struct sockaddr_in servaddr;
+ char service[20];
+ struct addrinfo hints, *rp;
+ struct addrinfo *res = NULL;
+ struct in_addr inaddr;
+ struct sockaddr_in addr;
+ int len = sizeof(addr);
+
+ if( !sock )
+ return -1;
+
+ socket_term(sock);
+
+ /*+--------------------------------------------------+
+ *| use getaddrinfo() to do domain name translation |
+ *+--------------------------------------------------+*/
+
+ memset(&hints, 0, sizeof(struct addrinfo));
+ hints.ai_family = AF_INET; /* Only support IPv4 */
+ hints.ai_socktype = SOCK_STREAM;
+ hints.ai_protocol = IPPROTO_TCP; /* TCP protocol */
+
+ /* If $host is a valid IP address, then don't use name resolution */
+ if( inet_aton(sock->host, &inaddr) )
+ {
+ //log_info("%s is a valid IP address, don't use domain name resolution.\n", sock->host);
+ hints.ai_flags |= AI_NUMERICHOST;
+ }
+
+ /* Obtain address(es) matching host/port */
+ snprintf(service, sizeof(service), "%d", sock->port);
+ if( (rv=getaddrinfo(sock->host, service, &hints, &res)) )
+ {
+ log_error("getaddrinfo() parser [%s:%s] failed: %s\n", sock->host, service, gai_strerror(rv));
+ return -3;
+ }
+
+ /* getaddrinfo() returns a list of address structures. Try each
+ address until we successfully connect or bind */
+ for (rp=res; rp!=NULL; rp=rp->ai_next)
+ {
+#if 0
+ char ipaddr[INET_ADDRSTRLEN];
+ struct sockaddr_in *sp = (struct sockaddr_in *) rp->ai_addr;
+
+ /* print domain name translation result */
+ memset( ipaddr, 0, sizeof(ipaddr) );
+ if( inet_ntop(AF_INET, &sp->sin_addr, ipaddr, sizeof(ipaddr)) )
+ {
+ log_info("domain name resolution [%s->%s]\n", sock->host, ipaddr);
+ }
+#endif
+
+ /* Create the socket */
+ sockfd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
+ if( sockfd < 0)
+ {
+ log_error("socket() create failed: %s\n", strerror(errno));
+ rv = -3;
+ continue;
+ }
+
+ /* connect to server */
+ rv = connect(sockfd, rp->ai_addr, len);
+ if( 0 == rv )
+ {
+ sock->fd = sockfd;
+ log_info("Connect to server[%s:%d] on fd[%d] successfully!\n", sock->host, sock->port, sockfd);
+ break;
+ }
+ else
+ {
+ /* socket connect get error, try another IP address */
+ close(sockfd);
+ continue;
+ }
+ }
+
+ freeaddrinfo(res);
+ return rv;
+}
+
+/* description: send data from the socket
+ * input args:
+ * $sock : socket context pointer
+ * $data : socket send data
+ * $bytes: socket send data bytes
+ * return value: <0: failure 0:ok
+ */
+int socket_send(socket_ctx_t *sock, char *data, int bytes)
+{
+ int rv = 0;
+ int i = 0;
+ int left_bytes = bytes;
+
+ if( !sock || !data || bytes<= 0 )
+ return -1;
+
+ while( left_bytes > 0 )
+ {
+ rv=write(sock->fd, &data[i], left_bytes);
+ if( rv < 0 )
+ {
+ log_info("socket[%d] write() failure: %s, close socket now\n", sock->fd, strerror(errno));
+ socket_term(sock);
+ return -2;
+ }
+ else if( rv == left_bytes )
+ {
+ log_info("socket send %d bytes data over\n", bytes);
+ return 0;
+ }
+ else
+ {
+ /* not send over this time, continue to send left data */
+ i += rv;
+ left_bytes -= rv;
+ continue;
+ }
+ }
+}
+
+/* description: receive data from the socket
+ * input args:
+ * $sock : socket context pointer
+ * $buf : socket receive data buffer
+ * $size : socket receive data buffer size
+ * $timeout: receive data time, <=0 will don't timeout
+ * return value: <0: failure 0:ok
+ */
+int socket_recv(socket_ctx_t *sock, char *buf, int size, int timeout)
+{
+ int rv = 0;
+ int i = 0;
+ fd_set rdset;
+ int maxfd;
+
+ if( !sock || !buf || size<= 0 )
+ return -1;
+
+ memset(buf, 0, size);
+
+ maxfd = sock->fd;
+ FD_ZERO(&rdset);
+ FD_SET(sock->fd, &rdset);
+
+ if( timeout <= 0 ) /* no timeout */
+ {
+ rv=select(maxfd+1, &rdset, NULL, NULL, NULL);
+ }
+ else
+ {
+ struct timeval tv;
+ tv.tv_sec = timeout;
+ tv.tv_usec = 0;
+ rv=select(maxfd+1, &rdset, NULL, NULL, &tv);
+ }
+
+ if( rv < 0 )
+ {
+ log_error("select() on socket[%d] got error: %s\n", sock->fd, strerror(errno));
+ return -2;
+ }
+ else if( rv == 0 )
+ {
+ log_error("select() on socket[%d] get timeout\n", sock->fd);
+ return 0;
+ }
+ else
+ {
+ rv = read(sock->fd, buf, size);
+ if( rv <= 0 )
+ {
+ log_error("socket[%d] read() failure or got disconnected: %s, close socket now\n", sock->fd, strerror(errno));
+ socket_term(sock);
+ return -2;
+ }
+ else
+ {
+ log_debug("socket[%d] receive %d bytes data\n", sock->fd, rv);
+ return rv;
+ }
+ }
+}
+
+
+
+/*+-------------------------------------------------------------------+
+ *| socket utils function |
+ *+-------------------------------------------------------------------+*/
+
+
+/* socket connected or not: <0: failure 0:ok */
+int sock_check_connect(int sockfd)
+{
+ struct tcp_info info;
+ int len=sizeof(info);
+
+ if( sockfd < 0 )
+ return -1;
+
+ getsockopt(sockfd, IPPROTO_TCP, TCP_INFO, &info, (socklen_t *)&len);
+
+ if( TCP_CLOSE==info.tcpi_state || TCP_CLOSING==info.tcpi_state || TCP_CLOSE_WAIT==info.tcpi_state )
+ {
+ return -3;
+ }
+
+ return -0;
+}
+
+/* description: set socket listen port as reusable, fix port already used bug */
+int socket_set_reuseaddr(int sockfd)
+{
+ int opt = 1;
+ int len = sizeof (int);
+
+ if (setsockopt (sockfd, SOL_SOCKET, SO_REUSEADDR, (void *) &opt, len))
+ {
+ log_error("Set socket[%d] option SO_REUSEADDR failed:%s\n", sockfd, strerror(errno));
+ return -1;
+ }
+ log_debug("Set socket[%d] option SO_REUSEADDR ok\n", sockfd);
+
+ return 0;
+}
+
+/* set socket as non-block mode, common socket default work as block mode */
+int socket_set_nonblock(int sockfd)
+{
+ int opts;
+ /*
+ * fcntl may set:
+ *
+ * EACCES, EAGAIN: Operation is prohibited by locks held by other
+ * processes. Or, operation is prohibited because the file has
+ * been memory-mapped by another process.
+ * EBADF: fd is not an open file descriptor, or the command was F_SETLK
+ * or F_SETLKW and the file descriptor open mode doesn't match
+ * with the type of lock requested.
+ * EDEADLK: It was detected that the specified F_SETLKW command would
+ * cause a deadlock.
+ * EFAULT: lock is outside your accessible address space.
+ * EINTR: For F_SETLKW, the command was interrupted by a signal. For
+ * F_GETLK and F_SETLK, the command was interrupted by a signal
+ * before the lock was checked or acquired. Most likely when
+ * locking a remote file (e.g. locking over NFS), but can
+ * sometimes happen locally.
+ * EINVAL: For F_DUPFD, arg is negative or is greater than the maximum
+ * allowable value. For F_SETSIG, arg is not an allowable signal
+ * number.
+ * EMFILE: For F_DUPFD, the process already has the maximum number of
+ * file descriptors open.
+ * ENOLCK: Too many segment locks open, lock table is full, or a remote
+ * locking protocol failed (e.g. locking over NFS).
+ * EPERM: Attempted to clear the O_APPEND flag on a file that has the
+ * append-only attribute set.
+ */
+ opts = fcntl(sockfd, F_GETFL);
+ if (opts < 0)
+ {
+ log_warn("fcntl() get socket options failure: %s\n", strerror(errno));
+ return -1;
+ }
+
+ opts |= O_NONBLOCK;
+
+ if (fcntl(sockfd, F_SETFL, opts) < 0)
+ {
+ log_warn("fcntl() set socket options failure: %s\n", strerror(errno));
+ return -1;
+ }
+
+ log_debug("Set socket[%d] none blocking\n", sockfd);
+ return opts;
+}
+
+
+/* set socket receive and send buffer size in linux kernel space */
+int socket_set_buffer(int sockfd, int rsize, int ssize)
+{
+ int opt;
+ socklen_t optlen = sizeof(opt);
+
+ if(sockfd < 0)
+ return -1;
+
+ /* Get system default receive buffer size, Linux X86: 85K */
+ if (getsockopt (sockfd, SOL_SOCKET, SO_RCVBUF, (char *) &opt, &optlen))
+ {
+ log_warn("getsockopt() get receive buffer failure: %s\n", strerror(errno));
+ return -2;
+ }
+
+ /* Only when current receive buffer size larger than the default one will change it */
+ if(rsize > opt)
+ {
+ opt = (int) rsize;
+ if (setsockopt (sockfd, SOL_SOCKET, SO_RCVBUF, (char *) &opt, optlen))
+ {
+ log_warn("setsockopt() set receive buffer to %d failure: %s\n", opt, strerror(errno));
+ return -2;
+ }
+ }
+
+ /* Get system default send buffer size, Linux X86: 16K */
+ if (getsockopt (sockfd, SOL_SOCKET, SO_SNDBUF, (char *) &opt, &optlen))
+ {
+ log_warn("getsockopt() get send buffer failure: %s\n", strerror(errno));
+ return -3;
+ }
+
+ /* Only when current receive buffer size larger than the default one will change it */
+ if(ssize > opt)
+ {
+ opt = (int) ssize;
+ if (setsockopt (sockfd, SOL_SOCKET, SO_SNDBUF, (char *) &opt, optlen))
+ {
+ log_warn("setsockopt() set send buffer to %d failure: %s\n", opt, strerror(errno));
+ return -3;
+ }
+ }
+
+ log_info("Set socket[%d] RCVBUF size:%d SNDBUF size:%d\n", sockfd, rsize, ssize);
+ return 0;
+}
+
+/*
+ * Enable socket SO_KEEPALIVE, if the connection disconnected, any system call on socket
+ * will return immediately and errno will be set to "WSAENOTCONN"
+ *
+ * keepalive is not program related, but socket related, * so if you have multiple sockets,
+ * you can handle keepalive for each of them separately.
+ *
+ * Reference: http://tldp.org/HOWTO/html_single/TCP-Keepalive-HOWTO/
+ */
+int socket_set_keepalive(int sockfd, int keepintvl, int keepcnt)
+{
+ int opt;
+
+ if(sockfd < 0)
+ return -1;
+
+ /* Enable the KEEPALIVE flag */
+ opt = 1;
+ if (setsockopt (sockfd, SOL_SOCKET, SO_KEEPALIVE, (char *) &opt, sizeof (opt)))
+ {
+ log_warn("setsockopt() enable SO_KEEPALIVE failure: %s\n", strerror(errno));
+ return -2;
+ }
+
+ if(keepintvl || keepcnt)
+ {
+ /*
+ * The tcp_keepidle parameter specifies the interval between the last data packet sent
+ * (simple ACKs are not considered data) and the first keepalive probe; after the
+ * connection is marked to need keepalive, this counter is not used any further.
+ * ~ >: cat /proc/sys/net/ipv4/tcp_keepalive_time
+ * 7200
+ */
+ opt = 3; /* 3 seconds */
+ if (setsockopt (sockfd, SOL_TCP, TCP_KEEPIDLE, (char *) &opt, sizeof (opt)))
+ {
+ log_error("setsockopt() set TCP_KEEPIDLE to %d seconds failure: %s\n", opt, strerror(errno));
+ return -3;
+ }
+
+ if((opt=keepintvl) > 0)
+ {
+ /*
+ * The tcp_keepintvl parameter specifies the interval between subsequential keepalive
+ * probes, regardless of what the connection has exchanged in the meantime.
+ * ~ >: cat /proc/sys/net/ipv4/tcp_keepalive_intvl
+ * 75
+ */
+ if (setsockopt (sockfd, SOL_TCP, TCP_KEEPINTVL, (char *) &opt, sizeof (opt)))
+ {
+ log_error("setsockopt() set TCP_KEEPINTVL to %d failure: %s\n", opt, strerror(errno));
+ return -4;
+ }
+ }
+
+ if((opt=keepcnt) > 0)
+ {
+ /*
+ * The TCP_KEEPCNT option specifies the maximum number of unacknowledged probes to
+ * send before considering the connection dead and notifying the application layer
+ * probes to be sent. The value of TCP_KEEPCNT is an integer value between 1 and n,
+ * where n is the value of the systemwide tcp_keepcnt parameter.
+ * ~ >: cat /proc/sys/net/ipv4/tcp_keepalive_probes
+ * 9
+ */
+ if (setsockopt (sockfd, SOL_TCP, TCP_KEEPCNT, (char *) &opt, sizeof (opt)))
+ {
+ log_error("setsockopt() set TCP_KEEPCNT to %d failure: %s\n", opt, strerror(errno));
+ return -5;
+ }
+ }
+ }
+
+ log_debug("Set socket[%d] KEEPINTVL:%d KEEPCNT:%d\n", sockfd, keepintvl, keepcnt);
+ return 0;
+}
+
+
+/* Set open file description count to max */
+void set_socket_rlimit(void)
+{
+ struct rlimit limit = {0};
+
+ getrlimit(RLIMIT_NOFILE, &limit );
+ limit.rlim_cur = limit.rlim_max;
+ setrlimit(RLIMIT_NOFILE, &limit );
+
+ log_info("set socket open fd max count to %d\n", limit.rlim_max);
+}
+
--
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