📄 codeexm6.txt
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<HTML><HEAD><TITLE>NETBOOK - Code Sample EXM6</TITLE></HEAD><BODY><pre>/* webserver.c */#include <stdio.h>#include <stdlib.h>#include <time.h>#include <cnaiapi.h>#if defined(LINUX) || defined(SOLARIS)#include <sys/time.h>#endif#define BUFFSIZE 256#define SERVER_NAME "CNAI Demo Web Server"#define ERROR_400 "<head></head><body><html><h1>Error 400</h1><p>Th\e server couldn't understand your request.</html></body>\n"#define ERROR_404 "<head></head><body><html><h1>Error 404</h1><p>Do\cument not found.</html></body>\n"#define HOME_PAGE "<head></head><body><html><h1>Welcome to the CNAI\ Demo Server</h1><p>Why not visit: <ul><li><a href=\"http://netbook.cs.pu\rdue.edu\">Netbook Home Page</a><li><a href=\"http://www.comerbooks.com\"\>Comer Books Home Page<a></ul></html></body>\n"#define TIME_PAGE "<head></head><body><html><h1>The current date is\: %s</h1></html></body>\n"int recvln(connection, char *, int);void send_head(connection, int, int);/*----------------------------------------------------------------------- * * Program: webserver * Purpose: serve hard-coded webpages to web clients * Usage: webserver <appnum> * *----------------------------------------------------------------------- */intmain(int argc, char *argv[]){ connection conn; int n; char buff[BUFFSIZE], cmd[16], path[64], vers[16]; char *timestr;#if defined(LINUX) || defined(SOLARIS) struct timeval tv;#elif defined(WIN32) time_t tv;#endif if (argc != 2) { (void) fprintf(stderr, "usage: %s <appnum>\n", argv[0]); exit(1); } while(1) { /* wait for contact from a client on specified appnum */ conn = await_contact((appnum) atoi(argv[1])); if (conn < 0) exit(1); /* read and parse the request line */ n = recvln(conn, buff, BUFFSIZE); sscanf(buff, "%s %s %s", cmd, path, vers); /* skip all headers - read until we get \r\n alone */ while((n = recvln(conn, buff, BUFFSIZE)) > 0) { if (n == 2 && buff[0] == '\r' && buff[1] == '\n') break; } /* check for unexpected end of file */ if (n < 1) { (void) send_eof(conn); continue; } /* check for a request that we cannot understand */ if (strcmp(cmd, "GET") || (strcmp(vers, "HTTP/1.0") && strcmp(vers, "HTTP/1.1"))) { send_head(conn, 400, strlen(ERROR_400)); (void) send(conn, ERROR_400, strlen(ERROR_400),0); (void) send_eof(conn); continue; } /* send the requested web page or a "not found" error */ if (strcmp(path, "/") == 0) { send_head(conn, 200, strlen(HOME_PAGE)); (void) send(conn, HOME_PAGE, strlen(HOME_PAGE),0); } else if (strcmp(path, "/time") == 0) {#if defined(LINUX) || defined(SOLARIS) gettimeofday(&tv, NULL); timestr = ctime(&tv.tv_sec);#elif defined(WIN32) time(&tv); timestr = ctime(&tv);#endif (void) sprintf(buff, TIME_PAGE, timestr); send_head(conn, 200, strlen(buff)); (void) send(conn, buff, strlen(buff), 0); } else { /* not found */ send_head(conn, 404, strlen(ERROR_404)); (void) send(conn, ERROR_404, strlen(ERROR_404),0); } (void) send_eof(conn); }}/*----------------------------------------------------------------------- * send_head - send an HTTP 1.0 header with given status and content-len *----------------------------------------------------------------------- */voidsend_head(connection conn, int stat, int len){ char *statstr, buff[BUFFSIZE]; /* convert the status code to a string */ switch(stat) { case 200: statstr = "OK"; break; case 400: statstr = "Bad Request"; break; case 404: statstr = "Not Found"; break; default: statstr = "Unknown"; break; } /* * send an HTTP/1.0 response with Server, Content-Length, * and Content-Type headers. */ (void) sprintf(buff, "HTTP/1.0 %d %s\r\n", stat, statstr); (void) send(conn, buff, strlen(buff), 0); (void) sprintf(buff, "Server: %s\r\n", SERVER_NAME); (void) send(conn, buff, strlen(buff), 0); (void) sprintf(buff, "Content-Length: %d\r\n", len); (void) send(conn, buff, strlen(buff), 0); (void) sprintf(buff, "Content-Type: text/html\r\n"); (void) send(conn, buff, strlen(buff), 0); (void) sprintf(buff, "\r\n"); (void) send(conn, buff, strlen(buff), 0);}</pre></body></html>⌨️ 快捷键说明
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