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the initial C code for the new HTTP test server
Daniel Stenberg committed
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/* sws.c: simple (silly?) web server */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <getopt.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <assert.h>

#ifndef DEFAULT_PORT
#define DEFAULT_PORT 8642
#endif

#ifndef DEFAULT_LOGFILE
#define DEFAULT_LOGFILE "/dev/null"
#endif

#define DOCBUFSIZE 4
#define BUFFERSIZE (DOCBUFSIZE * 1024)

#define VERSION "SWS/0.1"

#define TEST_DATA_PATH "../data/test%d"

static char *doc404 = "HTTP/1.1 404 Not Found\n"
    "Server: " VERSION "\n"
    "Connection: close\n"
    "Content-Type: text/html\n"
    "\n"
    "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n"
    "<HTML><HEAD>\n"
    "<TITLE>404 Not Found</TITLE>\n"
    "</HEAD><BODY>\n"
    "<H1>Not Found</H1>\n"
    "The requested URL was not found on this server.\n"
    "<P><HR><ADDRESS>" VERSION "</ADDRESS>\n" "</BODY></HTML>\n";

static volatile int sigpipe, sigterm;
static FILE *logfp;


static void logmsg(const char *msg)
{
    time_t t = time(NULL);
    struct tm *curr_time = localtime(&t);
    char loctime[80];

    strcpy(loctime, asctime(curr_time));
    loctime[strlen(loctime) - 1] = '\0';
    fprintf(logfp, "%s: pid %d: %s\n", loctime, getpid(), msg);
    fprintf(stderr, "%s: pid %d: %s\n", loctime, getpid(), msg);
    fflush(logfp);
}


static void sigpipe_handler(int sig)
{
    sigpipe = 1;
}


static void sigterm_handler(int sig)
{
    char logbuf[100];
    snprintf(logbuf, 100, "Got signal %d, terminating", sig);
    logmsg(logbuf);
    sigterm = 1;
}

int ProcessRequest(char *request)
{
  char *line=request;
  long contentlength=-1;

#define END_OF_HEADERS "\r\n\r\n"

  char *end;
  end = strstr(request, END_OF_HEADERS);

  if(!end)
    /* we don't have a complete request yet! */
    return 0;

  do {
    if(!strncasecmp("Content-Length:", line, 15))
      contentlength = strtol(line, &line, 10);

    line = strchr(line, '\n');
    if(line)
      line++;
  } while(line);

  if(contentlength > -1 ) {
    if(contentlength <= strlen(end+strlen(END_OF_HEADERS)))
      return 1; /* done */
    else
      return 0; /* not complete yet */
  }
  return 1; /* done */
}


#define REQBUFSIZ 4096
#define MAXDOCNAMELEN 1024
#define REQUEST_KEYWORD_SIZE 256
static int get_request(int sock)
{
  char reqbuf[REQBUFSIZ], doc[MAXDOCNAMELEN];
  char request[REQUEST_KEYWORD_SIZE];
  unsigned int offset = 0;
  int prot_major, prot_minor;

  while (offset < REQBUFSIZ) {
    int got = recv(sock, reqbuf + offset, REQBUFSIZ - offset, 0);
    if (got <= 0) {
      if (got < 0) {
        perror("recv");
        return -1;
      }
      logmsg("Connection closed by client");
      return -1;
    }
    offset += got;

    reqbuf[offset] = 0;

    if(ProcessRequest(reqbuf))
      break;
  }

  if (offset >= REQBUFSIZ) {
    logmsg("Request buffer overflow, closing connection");
    return -1;
  }
  reqbuf[offset]=0;
  
  logmsg("Got request:");
  logmsg(reqbuf);

  if (sscanf(reqbuf, "%s %s HTTP/%d.%d",
             request,
             doc,
             &prot_major,
             &prot_minor) == 4) {
    char *ptr;
    int test_no=0;

    /* find the last slash */
    ptr = strrchr(doc, '/');

    /* get the number after it */
    if(ptr) {
      test_no = strtol(ptr+1, &ptr, 10);

      logmsg("Found test number in PATH");
    }
    else
      logmsg("Did not find test number in PATH");

    return test_no;
  }
  
  logmsg("Got illegal request");
  fprintf(stderr, "Got illegal request\n");
  return -1;
}


static int send_doc(int sock, int doc)
{
  int written;
  int count;
  char *buffer;
  char *ptr;
  FILE *stream;

  char filename[256];

  if(doc < 0) {
    buffer = doc404;
    ptr = NULL;
    stream=NULL;
  }
  else {
    sprintf(filename, TEST_DATA_PATH, doc);

    stream=fopen(filename, "rb");
    if(!stream) {
      logmsg("Couldn't open test file");
      return 0;
    }

    ptr = buffer = spitout(stream, "reply", "data", &count);
  }

  do {
    written = send(sock, buffer, count, 0);
    if (written < 0) {
      fclose(stream);
      return -1;
    }
    count -= written;
    buffer += written;
  } while(count>0);

  if(ptr)
    free(ptr);
  if(stream)
    fclose(stream);

  return 0;
}


static void usage(const char *me)
{
    fprintf(stderr, "Usage: %s [ OPTIONS ]\n", me);
    fprintf(stderr,
	    "-p NUM    --port=NUM         accept requests on port NUM (default %d)\n",
	    DEFAULT_PORT);
    fprintf(stderr,
	    "-l FILE   --logfile=FILE     log requests to file FILE (default %s)\n",
	    DEFAULT_LOGFILE);
    fprintf(stderr,
	    "-f NUM    --fork=NUM         fork NUM server processes (default 0)\n");
    fprintf(stderr, "-h        --help             this screen\n");
    exit(1);
}


int main(int argc, char *argv[])
{
    struct sockaddr_in me;
    int sock, msgsock, flag;
    unsigned short port = DEFAULT_PORT;
    char *logfile = DEFAULT_LOGFILE;
    int c, longind;
    
    if(argc>1)
      port = atoi(argv[1]);

    logfile = "logfile";

    logfp = fopen(logfile, "a");
    if (!logfp) {
	perror(logfile);
	exit(1);
    }

    signal(SIGPIPE, sigpipe_handler);
    signal(SIGINT, sigterm_handler);
    signal(SIGTERM, sigterm_handler);

    siginterrupt(SIGPIPE, 1);
    siginterrupt(SIGINT, 1);
    siginterrupt(SIGTERM, 1);

    sock = socket(AF_INET, SOCK_STREAM, 0);
    if (sock < 0) {
	perror("opening stream socket");
	fprintf(logfp, "Error opening socket -- aborting\n");
	fclose(logfp);
	exit(1);
    }

    flag = 1;
    if (setsockopt
	(sock, SOL_SOCKET, SO_REUSEADDR, (const void *) &flag,
	 sizeof(int)) < 0) {
	perror("setsockopt(SO_REUSEADDR)");
    }

    me.sin_family = AF_INET;
    me.sin_addr.s_addr = INADDR_ANY;
    me.sin_port = htons(port);
    if (bind(sock, (struct sockaddr *) &me, sizeof me) < 0) {
	perror("binding stream socket");
	fprintf(logfp, "Error binding socket -- aborting\n");
	fclose(logfp);
	exit(1);
    }

    /* start accepting connections */
    listen(sock, 5);

    printf("*** %s listening on port %u ***\n", VERSION, port);

    while (!sigterm) {
      int doc;

      msgsock = accept(sock, NULL, NULL);
      
      if (msgsock == -1) {
        if (sigterm) {
          break;
        }
        /* perror("accept"); */
        continue;
      }
      
      logmsg("New client connected");

      doc = get_request(msgsock);
      if (doc > 0)
        send_doc(msgsock, doc);
      else
        send_doc(msgsock, -1);

      close(msgsock);
    }

    close(sock);
    fclose(logfp);

    return 0;
}