📄 web80.c

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💻 C
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/* web80.c : * * This is an extremely simple web server: * * This program runs in two modes: * * 1. Standalone Mode: *  $ ./web80 standalone * *  In this mode, this program functions *  as a very simple standalone web server. *  However, it must run as root to bind *  to the web port 80. * * 2. Sock Server Mode: *  $ ./web80 * *  In this mode, this program contacts *  the sockserv server to request a *  socket bound to port 80. If sockserv *  allows the request, it returns *  a port 80 socket. This allows this *  program to run without root and *  with no setuid requirement. */#include "common.h"intmain(int argc,char **argv) {    int z;    int s;             /* Web Server socket */    int c;                 /* Client socket */    int alen;             /* Address length */    struct sockaddr_in a_web; /* Web Server */    struct sockaddr_in a_cln;/* Client addr */    int b = TRUE;       /* For SO_REUSEADDR */    FILE *rx;                /* Read Stream */    FILE *tx;               /* Write Stream */    char getbuf[2048];        /* GET buffer */    time_t td;       /* Current date & time */    /*     * If any arguments are present on the     * command line, obtain the socket     * without help from the server (run     * in simple standalone mode):     */    if ( argc > 1 ) {        /*         * Standalone mode:         */        s = socket(PF_INET,SOCK_STREAM,0);        if ( s == -1 )            bail("socket(2)");        /*         * Web address on port 80:         */        memset(&a_web,0,sizeof a_web);        a_web.sin_family = AF_INET;        a_web.sin_port = ntohs(80);        a_web.sin_addr.s_addr =            ntohl(INADDR_ANY);        /*         * Bind the web server address-         * we need to be root to succeed         * at this:         */        z = bind(s,            (struct sockaddr *)&a_web,            sizeof a_web);        if ( z == -1 )            bail("binding port 80");            /*         * Turn on SO_REUSEADDR :         */        z = setsockopt(s,SOL_SOCKET,            SO_REUSEADDR,&b,sizeof b);        if ( z == -1 )            bail("setsockopt(2)");    } else  {        /*         * Run in sockserv mode:  Request         * a socket bound to port 80:         */        s = reqport(80);        if ( s == -1 )            bail("reqport(80)");    }    /*     * Now make this a listening socket:     */    z = listen(s,10);    if ( z == -1 )        bail("listen(2)");    /*     * Peform a simple, web server loop for     * demonstration purposes. Here we just     * accept one line of input text, and     * ignore it. We provide one simple     * HTML page back in response:     */    for (;;) {        /*         * Wait for a connect from browser:         */        alen = sizeof a_cln;        c = accept(s,            (struct sockaddr *)&a_cln,            &alen);        if ( c == -1 ) {            perror("accept(2)");            continue;        }        /*         * Create streams for convenience, and         * just eat any web command provided:         */        rx = fdopen(c,"r");        tx = fdopen(dup(c),"w");        fgets(getbuf,sizeof getbuf,rx);        /*         * Now serve a simple HTML response.         * This includes this web server's         * process ID and the current date         * and time:         */        fputs("<HTML>\n"            "<HEAD>\n"            "<TITLE>Test Page for this little "                "web80 server</TITLE>\n"            "</HEAD>\n"            "<BODY>\n"            "<H1>web80 Worked!</H1>\n",tx);        time(&td);        fprintf(tx,            "<H2>From PID %ld @ %s</H2>\n",            (long)getpid(),            ctime(&td));        fputs("</BODY>\n"            "</HTML>\n",tx);        fclose(tx);        fclose(rx);    }    return 0;}
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