124 lines
2.2 KiB
C
124 lines
2.2 KiB
C
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/*
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* srv.c -- Example server for easy exploiting
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*
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* Usage: srv <port>
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*
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* Example:
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*
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* C:\> srv 1234
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* C:\> nload localhost 1234 -s code.s
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*
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*/
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#if defined _WIN32
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#include <winsock2.h>
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#pragma comment(lib, "ws2_32.lib")
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#else
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <unistd.h>
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#endif
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#define SERVER_PORT 5432
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#define MAX_PENDING 1
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int ehlo, from;
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/* Main function */
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int main(int argc, char **argv) {
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DWORD old;
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struct sockaddr_in sin;
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char buf[8092], *ptr;
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int c, i, len, port;
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int s, new_s, bytes;
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#if defined _WIN32
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int wsaret;
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WSADATA wsaData;
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#endif
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int (*funct)();
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/* Command line parameters */
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if (argv[1])
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port = atoi(argv[1]);
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else
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port = SERVER_PORT;
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#if defined _WIN32
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/* Initialize winsock */
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wsaret = WSAStartup(0x101, &wsaData);
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if(wsaret != 0)
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return (0);
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/* Create a socket */
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if ((s = WSASocket(AF_INET, SOCK_STREAM, IPPROTO_TCP, NULL, 0, 0)) < 0) {
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fprintf(stderr, "%s: WSASocket - %s\n", argv[0], strerror(errno));
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exit(1);
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}
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#else
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if ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
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fprintf(stderr, "%s: socket - %s\n", argv[0], strerror(errno));
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exit(1);
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}
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#endif
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/* Initialize the addres data structure */
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memset((void *)&sin, 0, sizeof(sin));
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sin.sin_family = AF_INET;
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sin.sin_addr.s_addr = INADDR_ANY;
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sin.sin_port = htons(port);
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/* Bind an address to the socket */
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if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
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fprintf(stderr, "%s: bind - %s\n", argv[0], strerror(errno));
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exit(1);
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}
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/* Set the length of the listen queue */
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if (listen(s, MAX_PENDING) < 0) {
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fprintf(stderr, "%s: listen - %s\n", argv[0], strerror(errno));
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exit(1);
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}
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len = sizeof(sin);
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new_s = accept(s, (struct sockaddr *)&sin, &len);
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memset(buf, 0, sizeof(buf));
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bytes = recv(new_s, buf, sizeof(buf), 0);
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printf("recv'd %d\n", bytes);
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old = VirtualProtect(
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buf,
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sizeof(buf),
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PAGE_EXECUTE_READWRITE,
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&old);
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/* Run the code */
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fprintf(stderr,"Oops.. I'm 0wned, reprotect success: %lu.\n", old);
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__asm mov edi, new_s
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funct = (int (*)()) buf;
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(int)(*funct)();
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return (0);
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}
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