#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <ctype.h>
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#include <time.h>
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#include <pthread.h>
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#include <getopt.h>
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#include <libgen.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <poll.h>
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#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
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static inline void print_usage(char *progname);
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int socket_server_init(char *listen_ip, int listen_port);
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int main(int argc, char **argv)
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{
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int listenfd, connfd;
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int serv_port = 0;
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int daemon_run = 0;
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char *progname = NULL;
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int opt;
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int rv;
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int i, j;
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int found;
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int max;
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char buf[1024];
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struct pollfd fds_array[1024];
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struct option long_options[] =
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{
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{"daemon", no_argument, NULL, 'b'},
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{"port", required_argument, NULL, 'p'},
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{"help", no_argument, NULL, 'h'},
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{NULL, 0, NULL, 0}
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};
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progname = basename(argv[0]);
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/* Parser the command line parameters */
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while ((opt = getopt_long(argc, argv, "bp:h", long_options, NULL)) != -1)
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{
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switch (opt)
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{
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case 'b':
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daemon_run=1;
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break;
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case 'p':
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serv_port = atoi(optarg);
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break;
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case 'h': /* Get help information */
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print_usage(progname);
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return EXIT_SUCCESS;
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default:
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break;
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}
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}
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if( !serv_port )
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{
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print_usage(progname);
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return -1;
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}
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if( (listenfd=socket_server_init(NULL, serv_port)) < 0 )
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{
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printf("ERROR: %s server listen on port %d failure\n", argv[0],serv_port);
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return -2;
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}
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printf("%s server start to listen on port %d\n", argv[0],serv_port);
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/* set program running on background */
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if( daemon_run )
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{
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daemon(0, 0);
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}
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for(i=0; i<ARRAY_SIZE(fds_array) ; i++)
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{
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fds_array[i].fd=-1;
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}
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fds_array[0].fd = listenfd;
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fds_array[0].events = POLLIN;
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max = 0;
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for ( ; ; )
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{
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/* program will blocked here */
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rv = poll(fds_array, max+1, -1);
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if(rv < 0)
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{
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printf("select failure: %s\n", strerror(errno));
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break;
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}
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else if(rv == 0)
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{
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printf("select get timeout\n");
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continue;
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}
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/* listen socket get event means new client start connect now */
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if (fds_array[0].revents & POLLIN)
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{
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if( (connfd=accept(listenfd, (struct sockaddr *)NULL, NULL)) < 0)
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{
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printf("accept new client failure: %s\n", strerror(errno));
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continue;
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}
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found = 0;
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for(i=1; i<ARRAY_SIZE(fds_array) ; i++)
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{
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if( fds_array[i].fd < 0 )
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{
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printf("accept new client[%d] and add it into array\n", connfd );
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fds_array[i].fd = connfd;
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fds_array[i].events = POLLIN;
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found = 1;
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break;
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}
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}
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if( !found )
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{
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printf("accept new client[%d] but full, so refuse it\n", connfd);
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close(connfd);
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continue;
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}
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max = i>max ? i : max;
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if (--rv <= 0)
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continue;
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}
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else /* data arrive from already connected client */
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{
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for(i=1; i<ARRAY_SIZE(fds_array); i++)
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{
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if( fds_array[i].fd < 0 )
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continue;
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if( (rv=read(fds_array[i].fd, buf, sizeof(buf))) <= 0)
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{
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printf("socket[%d] read failure or get disconncet.\n", fds_array[i].fd);
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close(fds_array[i].fd);
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fds_array[i].fd = -1;
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}
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else
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{
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printf("socket[%d] read get %d bytes data\n", fds_array[i].fd, rv);
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/* convert letter from lowercase to uppercase */
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for(j=0; j<rv; j++)
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buf[j]=toupper(buf[j]);
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if( write(fds_array[i].fd, buf, rv) < 0 )
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{
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printf("socket[%d] write failure: %s\n", fds_array[i].fd, strerror(errno));
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close(fds_array[i].fd);
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fds_array[i].fd = -1;
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}
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}
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}
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}
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}
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CleanUp:
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close(listenfd);
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return 0;
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}
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static inline void print_usage(char *progname)
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{
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printf("Usage: %s [OPTION]...\n", progname);
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printf(" %s is a socket server program, which used to verify client and echo back string from it\n", progname);
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printf("\nMandatory arguments to long options are mandatory for short options too:\n");
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printf(" -b[daemon ] set program running on background\n");
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printf(" -p[port ] Socket server port address\n");
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printf(" -h[help ] Display this help information\n");
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printf("\nExample: %s -b -p 8900\n", progname);
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return ;
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}
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int socket_server_init(char *listen_ip, int listen_port)
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{
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struct sockaddr_in servaddr;
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int rv = 0;
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int on = 1;
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int listenfd;
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if ( (listenfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
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{
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printf("Use socket() to create a TCP socket failure: %s\n", strerror(errno));
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return -1;
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}
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/* Set socket port reuseable, fix 'Address already in use' bug when socket server restart */
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setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
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memset(&servaddr, 0, sizeof(servaddr));
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servaddr.sin_family = AF_INET;
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servaddr.sin_port = htons(listen_port);
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if( !listen_ip ) /* Listen all the local IP address */
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{
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servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
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}
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else /* listen the specified IP address */
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{
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if (inet_pton(AF_INET, listen_ip, &servaddr.sin_addr) <= 0)
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{
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printf("inet_pton() set listen IP address failure.\n");
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rv = -2;
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goto CleanUp;
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}
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}
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if(bind(listenfd, (struct sockaddr *) &servaddr, sizeof(servaddr)) < 0)
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{
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printf("Use bind() to bind the TCP socket failure: %s\n", strerror(errno));
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rv = -3;
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goto CleanUp;
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}
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if(listen(listenfd, 13) < 0)
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{
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printf("Use bind() to bind the TCP socket failure: %s\n", strerror(errno));
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rv = -4;
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goto CleanUp;
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}
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CleanUp:
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if(rv<0)
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close(listenfd);
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else
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rv = listenfd;
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return rv;
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}
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