2002-02-07 17:39:15 +08:00
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/* sws.c: simple (silly?) web server */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <signal.h>
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#include <getopt.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netdb.h>
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#include <assert.h>
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2002-02-07 20:40:06 +08:00
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#define DEFAULT_PORT 8999
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2002-02-07 17:39:15 +08:00
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#ifndef DEFAULT_LOGFILE
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#define DEFAULT_LOGFILE "/dev/null"
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#endif
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#define DOCBUFSIZE 4
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#define BUFFERSIZE (DOCBUFSIZE * 1024)
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2002-02-07 20:40:06 +08:00
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#define VERSION "cURL test suite HTTP server/0.1"
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#define REQUEST_DUMP "http-request.dump"
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2002-02-07 17:39:15 +08:00
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2002-02-19 08:26:25 +08:00
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#define TEST_DATA_PATH "data/test%d"
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2002-02-07 17:39:15 +08:00
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static char *doc404 = "HTTP/1.1 404 Not Found\n"
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"Server: " VERSION "\n"
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"Connection: close\n"
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"Content-Type: text/html\n"
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"\n"
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"<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n"
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"<HTML><HEAD>\n"
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"<TITLE>404 Not Found</TITLE>\n"
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"</HEAD><BODY>\n"
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"<H1>Not Found</H1>\n"
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"The requested URL was not found on this server.\n"
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"<P><HR><ADDRESS>" VERSION "</ADDRESS>\n" "</BODY></HTML>\n";
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static volatile int sigpipe, sigterm;
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static FILE *logfp;
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static void logmsg(const char *msg)
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{
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time_t t = time(NULL);
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struct tm *curr_time = localtime(&t);
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char loctime[80];
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strcpy(loctime, asctime(curr_time));
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loctime[strlen(loctime) - 1] = '\0';
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fprintf(logfp, "%s: pid %d: %s\n", loctime, getpid(), msg);
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fprintf(stderr, "%s: pid %d: %s\n", loctime, getpid(), msg);
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fflush(logfp);
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}
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static void sigpipe_handler(int sig)
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{
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sigpipe = 1;
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}
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static void sigterm_handler(int sig)
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{
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char logbuf[100];
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snprintf(logbuf, 100, "Got signal %d, terminating", sig);
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logmsg(logbuf);
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sigterm = 1;
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}
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int ProcessRequest(char *request)
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{
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char *line=request;
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long contentlength=-1;
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#define END_OF_HEADERS "\r\n\r\n"
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char *end;
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end = strstr(request, END_OF_HEADERS);
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if(!end)
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/* we don't have a complete request yet! */
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return 0;
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2002-02-07 20:52:04 +08:00
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/* **** Persistancy ****
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*
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* If the request is a HTTP/1.0 one, we close the connection unconditionally
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* when we're done.
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*
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* If the request is a HTTP/1.1 one, we MUST check for a "Connection:"
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* header that might say "close". If it does, we close a connection when
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* this request is processed. Otherwise, we keep the connection alive for X
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* seconds.
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*/
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2002-02-07 17:39:15 +08:00
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do {
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if(!strncasecmp("Content-Length:", line, 15))
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2002-02-07 20:42:59 +08:00
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contentlength = strtol(line+15, &line, 10);
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2002-02-07 17:39:15 +08:00
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line = strchr(line, '\n');
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if(line)
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line++;
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} while(line);
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if(contentlength > -1 ) {
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if(contentlength <= strlen(end+strlen(END_OF_HEADERS)))
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return 1; /* done */
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else
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return 0; /* not complete yet */
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}
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return 1; /* done */
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}
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2002-02-07 20:40:06 +08:00
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/* store the entire request in a file */
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void storerequest(char *reqbuf)
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{
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FILE *dump;
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dump = fopen(REQUEST_DUMP, "wb"); /* b is for windows-preparing */
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if(dump) {
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fwrite(reqbuf, 1, strlen(reqbuf), dump);
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fclose(dump);
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}
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}
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2002-02-07 17:39:15 +08:00
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#define REQBUFSIZ 4096
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#define MAXDOCNAMELEN 1024
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#define REQUEST_KEYWORD_SIZE 256
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static int get_request(int sock)
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{
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char reqbuf[REQBUFSIZ], doc[MAXDOCNAMELEN];
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char request[REQUEST_KEYWORD_SIZE];
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unsigned int offset = 0;
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int prot_major, prot_minor;
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while (offset < REQBUFSIZ) {
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int got = recv(sock, reqbuf + offset, REQBUFSIZ - offset, 0);
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if (got <= 0) {
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if (got < 0) {
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perror("recv");
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return -1;
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}
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logmsg("Connection closed by client");
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return -1;
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}
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offset += got;
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reqbuf[offset] = 0;
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if(ProcessRequest(reqbuf))
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break;
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}
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if (offset >= REQBUFSIZ) {
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logmsg("Request buffer overflow, closing connection");
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return -1;
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}
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reqbuf[offset]=0;
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2002-02-07 20:40:06 +08:00
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logmsg("Received a request");
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/* dump the request to an external file */
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storerequest(reqbuf);
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2002-02-07 17:39:15 +08:00
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if (sscanf(reqbuf, "%s %s HTTP/%d.%d",
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request,
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doc,
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&prot_major,
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&prot_minor) == 4) {
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char *ptr;
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int test_no=0;
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/* find the last slash */
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ptr = strrchr(doc, '/');
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/* get the number after it */
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if(ptr) {
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test_no = strtol(ptr+1, &ptr, 10);
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logmsg("Found test number in PATH");
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}
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else
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logmsg("Did not find test number in PATH");
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return test_no;
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}
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logmsg("Got illegal request");
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fprintf(stderr, "Got illegal request\n");
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return -1;
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}
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static int send_doc(int sock, int doc)
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{
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int written;
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int count;
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char *buffer;
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char *ptr;
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FILE *stream;
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char filename[256];
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if(doc < 0) {
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buffer = doc404;
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ptr = NULL;
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stream=NULL;
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}
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else {
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sprintf(filename, TEST_DATA_PATH, doc);
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stream=fopen(filename, "rb");
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if(!stream) {
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logmsg("Couldn't open test file");
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return 0;
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}
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ptr = buffer = spitout(stream, "reply", "data", &count);
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}
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do {
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written = send(sock, buffer, count, 0);
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if (written < 0) {
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fclose(stream);
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return -1;
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}
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count -= written;
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buffer += written;
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} while(count>0);
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if(ptr)
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free(ptr);
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if(stream)
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fclose(stream);
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return 0;
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}
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int main(int argc, char *argv[])
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{
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struct sockaddr_in me;
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int sock, msgsock, flag;
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unsigned short port = DEFAULT_PORT;
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char *logfile = DEFAULT_LOGFILE;
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if(argc>1)
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port = atoi(argv[1]);
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logfile = "logfile";
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logfp = fopen(logfile, "a");
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if (!logfp) {
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perror(logfile);
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exit(1);
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}
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signal(SIGPIPE, sigpipe_handler);
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signal(SIGINT, sigterm_handler);
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signal(SIGTERM, sigterm_handler);
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siginterrupt(SIGPIPE, 1);
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siginterrupt(SIGINT, 1);
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siginterrupt(SIGTERM, 1);
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sock = socket(AF_INET, SOCK_STREAM, 0);
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if (sock < 0) {
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perror("opening stream socket");
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fprintf(logfp, "Error opening socket -- aborting\n");
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fclose(logfp);
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exit(1);
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}
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flag = 1;
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if (setsockopt
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(sock, SOL_SOCKET, SO_REUSEADDR, (const void *) &flag,
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sizeof(int)) < 0) {
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perror("setsockopt(SO_REUSEADDR)");
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}
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me.sin_family = AF_INET;
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me.sin_addr.s_addr = INADDR_ANY;
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me.sin_port = htons(port);
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if (bind(sock, (struct sockaddr *) &me, sizeof me) < 0) {
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perror("binding stream socket");
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fprintf(logfp, "Error binding socket -- aborting\n");
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fclose(logfp);
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exit(1);
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}
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/* start accepting connections */
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listen(sock, 5);
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printf("*** %s listening on port %u ***\n", VERSION, port);
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while (!sigterm) {
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int doc;
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msgsock = accept(sock, NULL, NULL);
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if (msgsock == -1) {
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if (sigterm) {
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break;
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}
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/* perror("accept"); */
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continue;
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}
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logmsg("New client connected");
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doc = get_request(msgsock);
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if (doc > 0)
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send_doc(msgsock, doc);
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else
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send_doc(msgsock, -1);
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close(msgsock);
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}
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close(sock);
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fclose(logfp);
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return 0;
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}
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