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Code Issues Releases Activity

Added leading comment and security check.

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This commit is contained in:
Guido van Rossum 1997-07-19 21:33:10 +00:00
parent 42ded89c08
commit e0c6901369
1 changed files with 28 additions and 5 deletions
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33
Demo/pysvr/pysvr.c
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@ -1,3 +1,13 @@
/* A multi-threaded telnet-like server that gives a Python prompt.
Usage: pysvr [port]
For security reasons, it only accepts requests from the current host.
This can still be insecure, but restricts violations from people who
can log in on your machine. Use with caution!
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@ -88,8 +98,8 @@ usage()
static void
main_thread(int port)
{
int sock;
struct sockaddr_in addr;
int sock, conn, size;
struct sockaddr_in addr, clientaddr;
sock = socket(PF_INET, SOCK_STREAM, 0);
if (sock < 0) {
@ -117,9 +127,7 @@ main_thread(int port)
fprintf(stderr, "Listening on port %d...\n", port);
for (;;) {
struct sockaddr_in clientaddr;
int conn, size;
size = sizeof clientaddr;
conn = accept(sock, (struct sockaddr *) &clientaddr, &size);
if (conn < 0) {
oprogname();
@ -127,6 +135,21 @@ main_thread(int port)
exit(1);
}
size = sizeof addr;
if (getsockname(conn, (struct sockaddr *)&addr, &size) < 0) {
oprogname();
perror("can't get socket name of connection");
exit(1);
}
if (clientaddr.sin_addr.s_addr != addr.sin_addr.s_addr) {
oprogname();
perror("connection from non-local host refused");
fprintf(stderr, "(addr=%lx, clientaddr=%lx)\n",
ntohl(addr.sin_addr.s_addr),
ntohl(clientaddr.sin_addr.s_addr));
close(conn);
continue;
}
create_thread(conn, &clientaddr);
}
}