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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>
#define DEFAULT_PORT 8999
#ifndef DEFAULT_LOGFILE
#define DEFAULT_LOGFILE "/dev/null"
#endif
#define DOCBUFSIZE 4
#define BUFFERSIZE (DOCBUFSIZE * 1024)
#define VERSION "cURL test suite HTTP server/0.1"
#define REQUEST_DUMP "http-request.dump"
#define TEST_DATA_PATH "data/test%d"
static char *docfriends = "WE ROOLZ\r\n";
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;
/* **** Persistancy ****
*
* If the request is a HTTP/1.0 one, we close the connection unconditionally
* when we're done.
*
* If the request is a HTTP/1.1 one, we MUST check for a "Connection:"
* header that might say "close". If it does, we close a connection when
* this request is processed. Otherwise, we keep the connection alive for X
* seconds.
*/
do {
if(!strncasecmp("Content-Length:", line, 15))
contentlength = strtol(line+15, &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 */
}
/* store the entire request in a file */
void storerequest(char *reqbuf)
{
FILE *dump;
dump = fopen(REQUEST_DUMP, "wb"); /* b is for windows-preparing */
if(dump) {
fwrite(reqbuf, 1, strlen(reqbuf), dump);
fclose(dump);
}
}
#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("Received a request");
/* dump the request to an external file */
storerequest(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) {
if(!strcmp("/verifiedserver", ptr)) {
logmsg("Are-we-friendly question received");
return -2;
}
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) {
if(-2 == doc)
/* we got a "friends?" question, reply back that we sure are */
buffer = docfriends;
else
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;
}
int main(int argc, char *argv[])
{
struct sockaddr_in me;
int sock, msgsock, flag;
unsigned short port = DEFAULT_PORT;
char *logfile = DEFAULT_LOGFILE;
if(argc>1)
port = atoi(argv[1]);
logfile = "logfile";
/* FIX: write our pid to a file name */
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);
send_doc(msgsock, doc);
close(msgsock);
}
close(sock);
fclose(logfp);
return 0;
}
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