舊站 POP3 驗證程式逆向工程 - ntouind/sites.ind.ntou.edu.tw GitHub Wiki
這是舊站用來進行 POP3 驗證的程式
**更新：**已經找到來源碼
luit -encoding BIG5 strings --encoding=S pop3.cgi
(stripped)
錯誤: 參數不正確(host, name, password).
錯誤: 找不到郵件主機(%s).
錯誤: 無法辯認主機回應 (%s)
QUIT
USER %s
錯誤: 使用者不正確(%s).
PASS %s
錯誤: 密碼錯誤(%s).
錯誤: 連線失敗(%s).
正確: 認證通過
(stripped)
//
// This file was generated by the Retargetable Decompiler
// Website: https://retdec.com
// Copyright (c) 2016 Retargetable Decompiler <[email protected]>
//
#include <arpa/inet.h>
#include <netdb.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>
// ------------------------ Structures ------------------------
// FILE {
// int32_t e0;
// };
// struct hostent {
// char * e0;
// char ** e1;
// int32_t e2;
// int32_t e3;
// char ** e4;
// };
// struct sockaddr {
// int32_t e0;
// char e1[14];
// };
// ------------------- Function Prototypes --------------------
int32_t name_resolve(char * cp, int32_t a2);
// --------------------- Global Variables ---------------------
char * error_message_wrong_arg = "錯誤: 參數不正確(host, name, password)."; // 0x8048b10
int32_t g2 = 0x7ebbf9bf; // 0x8048b39
int32_t g3 = 0x7ebbf9bf; // 0x8048b58
int32_t g4 = 0x7ebbf9bf; // 0x8048b86
int32_t g5 = 0x7ebbf9bf; // 0x8048ba9
int32_t g6 = 0x7ebbf9bf; // 0x8048bbe
int32_t g7 = 0x54bdbfa5; // 0x8048bd3
struct sockaddr * g8 = NULL; // 0x8049d20
// ------------------------ Functions -------------------------
// Address range: 0x80486a8 - 0x8048709
int32_t name_resolve(char * cp, int32_t a2) {
int32_t result = inet_addr(cp); // 0x80486b2
int32_t data = result; // bp-8
if (result != -1) {
// 0x8048708
return result;
}
struct hostent * v1 = gethostbyname(cp); // 0x80486ca
int32_t v2 = (int32_t)v1; // 0x80486ca_3
if (v1 != NULL) {
int32_t n = *(int32_t *)(v2 + 12); // 0x80486e7
int32_t str = *(int32_t *)(v2 + 16); // 0x80486f2
bcopy((char *)*(int32_t *)str, (char *)&data, n);
// branch -> 0x8048708
} else {
data = 0;
}
// 0x8048708
return data;
}
// Address range: 0x804870c - 0x8048b07
int main(int argc, char ** argv) {
int32_t buf = 0; // bp-1156
int32_t v1;
memset((char *)&v1, 0, 1023);
if (argc <= 3) {
// 0x804873d
fprintf(stdout, error_message_wrong_arg);
// branch -> 0x8048b04
// 0x8048b04
return -1;
}
int32_t sock_fd = socket(AF_INET, SOCK_STREAM, IPPROTO_IP); // 0x8048762
int32_t addr;
memset((char *)&addr, 0, 16);
int32_t v2 = (int32_t)argv; // 0x804879a_0
if (name_resolve((char *)*(int32_t *)(v2 + 4), addr) == 0) {
// 0x80487bc
fprintf(stdout, (char *)&g2);
close(sock_fd);
// branch -> 0x8048b04
// 0x8048b04
return -1;
}
// 0x80487f0
if (connect(sock_fd, (struct sockaddr *)&addr, 16) != 0) {
// 0x8048ac4
fprintf(stdout, (char *)&g6);
// branch -> 0x8048b04
// 0x8048b04
return -1;
}
// 0x8048812
recv(sock_fd, (char *)&buf, 1024, 0);
int32_t result; // 0x8048b05_2
if (strncmp((char *)&buf, "+OK", 3) == 0) {
// 0x80488b0
buf = 0;
int32_t v3 = *(int32_t *)(v2 + 8); // 0x80488bd
int32_t str;
snprintf((char *)&str, 128, "USER %s\r\n", (char *)v3);
int32_t len = strlen((char *)&str); // 0x80488dc
int32_t len2; // 0x80489d0
int32_t v4; // 0x80489b1
if (send(sock_fd, (char *)&str, len, 0) != 0) {
// 0x8048904
recv(sock_fd, (char *)&buf, 1024, 0);
if (strncmp((char *)&buf, "+OK", 3) == 0) {
// 0x80489a4
buf = 0;
// branch -> 0x80489ab
// 0x80489ab
v4 = *(int32_t *)(v2 + 12);
snprintf((char *)&str, 128, "PASS %s\r\n", (char *)v4);
len2 = strlen((char *)&str);
if (send(sock_fd, (char *)&str, len2, 0) != 0) {
// 0x80489f8
recv(sock_fd, (char *)&buf, 1024, 0);
if (strncmp((char *)&buf, "+OK", 3) == 0) {
// 0x8048a94
buf = 0;
// branch -> 0x8048a9b
// 0x8048a9b
send(sock_fd, "QUIT\r\n", 6, 0);
close(sock_fd);
fprintf(stdout, (char *)&g7);
result = 1;
// branch -> 0x8048b04
} else {
// 0x8048a4a
fprintf(stdout, (char *)&g5);
send(sock_fd, "QUIT\r\n", 6, 0);
close(sock_fd);
result = -1;
// branch -> 0x8048b04
}
// 0x8048b04
return result;
}
// 0x8048a9b
send(sock_fd, "QUIT\r\n", 6, 0);
close(sock_fd);
fprintf(stdout, (char *)&g7);
result = 1;
// branch -> 0x8048b04
} else {
// 0x8048956
fprintf(stdout, (char *)&g4);
send(sock_fd, "QUIT\r\n", 6, 0);
close(sock_fd);
result = -1;
// branch -> 0x8048b04
}
// 0x8048b04
return result;
}
// 0x80489ab
v4 = *(int32_t *)(v2 + 12);
snprintf((char *)&str, 128, "PASS %s\r\n", (char *)v4);
len2 = strlen((char *)&str);
if (send(sock_fd, (char *)&str, len2, 0) != 0) {
// 0x80489f8
recv(sock_fd, (char *)&buf, 1024, 0);
if (strncmp((char *)&buf, "+OK", 3) == 0) {
// 0x8048a94
buf = 0;
// branch -> 0x8048a9b
// 0x8048a9b
send(sock_fd, "QUIT\r\n", 6, 0);
close(sock_fd);
fprintf(stdout, (char *)&g7);
result = 1;
// branch -> 0x8048b04
} else {
// 0x8048a4a
fprintf(stdout, (char *)&g5);
send(sock_fd, "QUIT\r\n", 6, 0);
close(sock_fd);
result = -1;
// branch -> 0x8048b04
}
// 0x8048b04
return result;
}
// 0x8048a9b
send(sock_fd, "QUIT\r\n", 6, 0);
close(sock_fd);
fprintf(stdout, (char *)&g7);
result = 1;
// branch -> 0x8048b04
} else {
// 0x8048864
fprintf(stdout, (char *)&g3);
send(sock_fd, "QUIT\r\n", 6, 0);
close(sock_fd);
result = -1;
// branch -> 0x8048b04
}
// 0x8048b04
return result;
}
// --------------- Dynamically Linked Functions ---------------
// void bcopy(const void * src, void * dest, size_t n);
// int close(int fd);
// int connect(int fd, __CONST_SOCKADDR_ARG addr, socklen_t len);
// int fprintf(FILE * restrict stream, const char * restrict format, ...);
// struct hostent * gethostbyname(const char * name);
// in_addr_t inet_addr(const char * cp);
// void * memset(void * s, int c, size_t n);
// ssize_t recv(int fd, void * buf, size_t n, int flags);
// ssize_t send(int fd, const void * buf, size_t n, int flags);
// int snprintf(char * restrict s, size_t maxlen, const char * restrict format, ...);
// int socket(int domain, int type, int protocol);
// size_t strlen(const char * s);
// int strncmp(const char * s1, const char * s2, size_t n);
// --------------------- Meta-Information ---------------------
// Detected compiler/packer: gcc (bsd) (4.2.1)
// Detected functions: 2
// Decompiler release: v2.2.1 (2016-09-07)
// Decompilation date: 2016-12-27 07:36:13