📄 timedate.c
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/* Example custom web server for timedate.com */#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <string.h>#include <time.h>#include <sys/types.h>#include <sys/socket.h> /* socket specific definitions */#include <netinet/in.h> /* INET constants and stuff */#include <signal.h>#include <sys/wait.h>#include <stdarg.h>#include <unistd.h>#include <errno.h>#include "hitsubs.h"#include "readline.h"/* This is the HTTP header we need to send to let the browser know we will be sending HTML*/char *http_header = "HTTP/1.0 200 OK\nContent-type: text/html\n\n";/* This is some HTML we always send (goes at the top of each page) */char *html_header = "<TITLE>timedate.com - your personal time provider</TITLE>\n""<BODY BGCOLOR=#FFFFFF>\n""<CENTER><H1><FONT COLOR=BLUE>Welcome to timedate.com</FONT>""<FONT COLOR=RED>       * Now Y2Kapable!</FONT></H1>\n""<H2><I>\"time to get a new fence\"</I></H2>\n""<HR WIDTH=80%></CENTER>\n\n";//// printf routed to a socket.//void sock_printf(int sock, char *fmt, ...){ va_list argp; char obuf[2000]; va_start(argp,fmt); vsprintf(obuf,fmt,argp); va_end(argp); write(sock,obuf,strlen(obuf));}void html_error(int sock, char *s ) { sock_printf(sock,"%s",http_header); sock_printf(sock,"<H1>Errors Happen!</H1><BR>\n%s\n",s);}char *dow[] = { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};char *months[] = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"};void process_request(int sock,int mon, int day, int year, struct tm *t) { int *hits_per_hour; int i; /* Start with the HTTP header */ sock_printf(sock,"%s",http_header); /* Now print the HTML header */ sock_printf(sock,"%s",html_header); /* Now print the time and date */ sock_printf(sock,"<H3 ALIGN=CENTER>It is now: %d:%d</H3>\n", t->tm_hour,t->tm_min); sock_printf(sock,"<H3 ALIGN=CENTER>Today is: %s, %s %d, %d</H3>\n", dow[t->tm_wday], months[t->tm_mon], t->tm_mday, t->tm_year+1900); if ((hits_per_hour = hits_for_date(mon+1,day,year))!=NULL) { /* print the hitlist */ sock_printf(sock,"<BR><HR><BR>\n"); sock_printf(sock,"<TABLE BGCOLOR=LIGHTBLUE ALIGN=CENTER BORDER=2\n"); sock_printf(sock,"<TR><TD COLSPAN=5 VALIGN=MIDDLE ALIGN=CENTER><H3><FONT COLOR=RED>Hit List for %s %d, %d</FONT></H3></TD></TR>\n", months[mon],day,year); sock_printf(sock,"<TR ALIGN=CENTER><TH WIDTH=100>Hour</TH><TH WIDTH=100>Hits</TH>\n"); sock_printf(sock,"<TH      ></TH><TH WIDTH=100>Hour</TH><TH WIDTH=100>Hits</TH></TR>\n"); for (i=0;i<12;i++) { sock_printf(sock,"<TR ALIGN=CENTER><TD>%d-%d:00</TD><TD>%d</TD>\n", i,i+1,hits_per_hour[i]); sock_printf(sock,"<TD></TD>"); sock_printf(sock,"<TD>%d-%d:00</TD><TD>%d</TD></TR>\n", i+12,i+13,hits_per_hour[i+12]); } sock_printf(sock,"</TABLE>\n"); }}void handle_client( int sock ) { char request[1000]; char *ptr; int mon,day,year; struct tm *timerec; time_t t; /* get the current time and date */ t = time(NULL); timerec = localtime( &t ); /* record the hit and read the hit database */ printf("RECORDING THE HIT\n"); if ( hit_me()==0) { printf("ERROR HITTING WAS %s \n", hiterrorstr()); } /* Now get the request */ if (readline(sock,request,1000)<=0) { /* client gone or error - quit */ return; } /* parse the html request */ /* find the request method */ if ((ptr = strtok(request," "))==NULL) { html_error(sock,"Invalid request"); return; } if (strncasecmp(ptr,"get",3)!=0) { html_error(sock,"Invalid request"); return; } /* again should get the resource */ if ((ptr = strtok(NULL," "))==NULL) { html_error(sock,"Invalid request"); return; } /* ptr should now point to the resource name */ if (*ptr != '/') { /* invalid request - pretend just asking for / */ strcpy(ptr,"/"); } if (3 == sscanf(ptr,"/%d/%d/%d",&mon,&day,&year)) { process_request(sock,mon-1,day,year,timerec); } else { /* not a full request - just send back today's hitlist */ process_request(sock,timerec->tm_mon, timerec->tm_mday, timerec->tm_year+1900,timerec); } return;} /* Server main routine 1. create a socket 2. bind the socket and print out the port number assigned 3. put the socket into passive mode (listen) 4. do forever get next connection handle the connection enddo*/void sigcld_handler( int s ) { int c; wait(&c);}int main(){ int ld,sd; struct sockaddr_in skaddr; struct sockaddr_in from; int addrlen,length; int skip; signal(SIGCHLD,sigcld_handler);/* create a socket IP protocol family (PF_INET) TCP protocol (SOCK_STREAM)*/ if ((ld = socket( PF_INET, SOCK_STREAM, 0 )) < 0) { perror("Problem creating socket\n"); exit(1); } /* establish our address address family is AF_INET our IP address is INADDR_ANY (any of our IP addresses) the port number is assigned by the kernel */ skaddr.sin_family = AF_INET; skaddr.sin_addr.s_addr = htonl(INADDR_ANY); skaddr.sin_port = htons(0); if (bind(ld, (struct sockaddr *) &skaddr, sizeof(skaddr))<0) { perror("Problem binding\n"); exit(0); } /* find out what port we were assigned and print it out */ length = sizeof( skaddr ); if (getsockname(ld, (struct sockaddr *) &skaddr, &length)<0) { perror("Error getsockname\n"); exit(1); } printf("The Server passive socket port number is %d\n",ntohs(skaddr.sin_port));/* put the socket into passive mode (waiting for connections) */ if (listen(ld,5) < 0 ) { perror("Error calling listen\n"); exit(1); } /* now process incoming connections forever ... */ while (1) { skip=0; addrlen=sizeof(skaddr); if ( (sd = accept( ld, (struct sockaddr*) &from, &addrlen)) < 0) { if (errno==EINTR) skip=1; else { perror("Problem with accept call\n"); exit(1); } } /* if ((!skip) && (fork()==0)) { close(ld); handle_client(sd); exit(0); } else { close(sd); } */ printf("GOT A CLIENT\n"); if (!skip) { handle_client(sd); close(sd); } }}⌨️ 快捷键说明
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