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inaz2/client.c

Created March 4, 2016 08:20
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Revisions

  1. inaz2 revised this gist Mar 4, 2016. 1 changed file with 1 addition and 0 deletions.
    1 change: 1 addition & 0 deletions client.c
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    Original file line number Diff line number Diff line change
    @@ -1,3 +1,4 @@
    #include <stdio.h>
    #include <string.h>
    #include <sys/types.h>
    #include <sys/socket.h>
  2. inaz2 created this gist Mar 4, 2016.
    34 changes: 34 additions & 0 deletions client.c
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    @@ -0,0 +1,34 @@
    #include <string.h>
    #include <sys/types.h>
    #include <sys/socket.h>
    #include <arpa/inet.h>

    void ping(int s, char *message)
    {
    char buf[8192];

    strncpy(buf, message, sizeof(buf));
    send(s, buf, strlen(buf), 0);
    recv(s, buf, 8192, 0);
    strtok(buf, "\n");
    puts(buf);
    }

    int main()
    {
    int s;
    struct sockaddr_in6 addr;

    s = socket(AF_INET6, SOCK_STREAM, 0);
    addr.sin6_family = AF_INET6;
    addr.sin6_port = htons(5000);
    inet_pton(AF_INET6, "::1", &addr.sin6_addr);
    connect(s, (struct sockaddr *)&addr, sizeof(addr));

    ping(s, "hoge\n");
    ping(s, "fuga\n");
    ping(s, "piyo\n");

    close(s);
    return 0;
    }
    25 changes: 25 additions & 0 deletions result.txt
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    @@ -0,0 +1,25 @@
    $ gcc server.c -o server

    $ gcc client.c -o client

    $ ./server &
    [1] 6422

    $ netstat -ant
    Active Internet connections (servers and established)
    Proto Recv-Q Send-Q Local Address Foreign Address State
    tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
    tcp 0 0 127.0.0.1:6010 0.0.0.0:* LISTEN
    tcp 0 0 127.0.0.1:6011 0.0.0.0:* LISTEN
    tcp 0 0 127.0.0.1:3306 0.0.0.0:* LISTEN
    tcp 0 216 192.168.56.2:22 192.168.56.1:54688 ESTABLISHED
    tcp 0 0 192.168.56.2:22 192.168.56.1:59121 ESTABLISHED
    tcp6 0 0 :::22 :::* LISTEN
    tcp6 0 0 ::1:6010 :::* LISTEN
    tcp6 0 0 ::1:6011 :::* LISTEN
    tcp6 0 0 :::5000 :::* LISTEN

    $ ./client
    hoge
    fuga
    piyo
    55 changes: 55 additions & 0 deletions server.c
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    #include <stdlib.h>
    #include <string.h>
    #include <sys/types.h>
    #include <sys/socket.h>
    #include <arpa/inet.h>

    void handle_client(int c)
    {
    char buf[8192];
    char *lastpos;
    int size;

    while (1) {
    size = recv(c, buf, 8192, 0);
    if (size == 0) {
    break;
    }
    lastpos = strchr(buf, '\n');
    send(c, buf, lastpos+1-buf, 0);
    }
    }

    int main()
    {
    int s, c;
    int reuseaddr = 1;
    struct sockaddr_in6 addr;
    int pid;

    s = socket(AF_INET6, SOCK_STREAM, 0);
    setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &reuseaddr, sizeof(reuseaddr));

    addr.sin6_family = AF_INET6;
    addr.sin6_port = htons(5000);
    addr.sin6_addr = in6addr_any;

    bind(s, (struct sockaddr *)&addr, sizeof(addr));
    listen(s, 5);

    while (1) {
    c = accept(s, NULL, NULL);
    pid = fork();
    if (pid == -1) {
    exit(1);
    } else if (pid == 0) {
    close(s);
    handle_client(c);
    close(c);
    return 0;
    } else {
    close(c);
    waitpid(pid, NULL, 0);
    }
    }
    }