Newer
Older
/* 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 "log/sws.log"
#endif
#define DOCBUFSIZE 4
#define BUFFERSIZE (DOCBUFSIZE * 1024)
#define VERSION "cURL test suite HTTP server/0.1"
#define REQUEST_DUMP "log/http-request.dump"
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);
}
}
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
#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");
}
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;
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
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]);
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
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);