Linux编程之给你的程序开后门

#!/bin/bash
 
my_inp_fifo=/vob/ljsdpoenew3/exercise/debug_log    # 指定fifo文件
stty erase ^H    
 
while [ true ];
do
 
        read inp    #循环读入用户输入
        if [ "$inp" == "quit" ];then   #quit代表结束该界面
                exit 0
        fi
        echo $inp > $my_inp_fifo   #写入fifo
        cat debug_log2.txt         #显示log的内容
done

  1 #include <stdio.h>
  2 #include <string.h>
  3 #include <stdlib.h>
  4 #include <math.h>
  5 #include <sys/types.h>
  6 #include <sys/stat.h>
  7 #include <sys/prctl.h>
  8 #include "msg_def.h"
  9 #include "global.h"
 10  
 11 extern Queue_t MsgQueue;
 12 extern dashboard_t global;
 13  
 14  
 15 #define  MAX_NUM_ARGS  20
 16 #define  MAX_ARGS_SIZE  56
 17  
 18 static char args[MAX_NUM_ARGS][MAX_ARGS_SIZE];
 19  
 20 static int get_args(FILE *inputFile,FILE *fd)
 21 {
 22     char tmpBuffer[100];
 23     char tmpBuffer2[100];
 24     char *line = tmpBuffer;
 25     char separator[] = " ,\n\t";
 26     char *token;
 27     int  i;
 28     char eof;
 29  
 30     int num = 0;
 31  
 32     eof = !fgets(line, sizeof(tmpBuffer), inputFile);
 33     if (eof)
 34         return num;
 35  
 36     memcpy(tmpBuffer2,tmpBuffer,100);
 37  
 38  
 39     token = strtok(line, separator);
 40     while (num < MAX_NUM_ARGS && token)
 41     {
 42         strcpy(args[num], token);
 43         num++;
 44         token = strtok(NULL, separator);
 45     }
 46  
 47     for (i = num; i < MAX_NUM_ARGS; i++)
 48         args[i][0] = 0;
 49  
 50     if(num > 0)
 51     {
 52         fprintf(fd, "%s", tmpBuffer2);
 53     }
 54  
 55     return num;
 56 }
 57  
 58  
 59 static void help_manual(FILE* fd)
 60 {
 61     fprintf(fd,"\nd d         :           display current debug level\n");
 62     fprintf(fd,"d q         :           display msg queue length, head and tail\n");
 63     fprintf(fd,"s d [level] :           set debug [level] \n");
 64 }
 65  
 66 static void show_MQ(FILE* fd)
 67 {
 68     fprintf(fd," msg queue length:%d  head:%d  tail:%d \n",abs(MsgQueue.head-MsgQueue.rear),MsgQueue.head,MsgQueue.rear);
 69 }
 70  
 71 static void show_debug_level(FILE* fd)
 72 {
 73     fprintf(fd," current debug level: %d\n", global.debug_level);
 74 }
 75  
 76  
 77  
 78 void debug_center()
 79 {
 80     int rc,num,n;
 81     FILE* fp;
 82     FILE* fd;
 83  
 84     MY_LOG(DEBUG,"Hi,debug!\n");
 85  
 86  
 87     system("rm /vob/ljsdpoenew3/exercise/debug_log");
 88     system("rm /vob/ljsdpoenew3/exercise/debug_log2");
 89     rc = mkfifo("/vob/ljsdpoenew3/exercise/debug_log", 0666);
 90     if(rc < 0)
 91     {
 92        MY_LOG(DEBUG, "make fifo fail!\n");
 93        pthread_exit(0);
 94     }
 95  
 96     fp = fopen("/vob/ljsdpoenew3/exercise/debug_log", "r");
 97     if(fp == NULL)
 98     {
 99         MY_LOG(DEBUG, "open debug_log fail!\n");
100         pthread_exit(0);
101     }
102  
103     fd = fopen("/vob/ljsdpoenew3/exercise/debug_log2", "w+");
104     if(fd == NULL)
105     {
106         MY_LOG(DEBUG, "open debug_log2 fail!\n");
107         pthread_exit(0);
108     }
109     //freopen("/vob/ljsdpoenew3/exercise/debug_log2.txt", "w+", fd);
110  
111     fprintf(fd,"  \n==================================================\n");
112     fprintf(fd,"             Welcme to Debug Center!");
113     fprintf(fd,"  \n==================================================\n\n");
114     help_manual(fd);
115     //fflush(fd);
116  
117     while(1)
118     {
119         fflush(fd);
120         fprintf(fd,"\n\nmy_diag>");
121         num = get_args(fp,fd);
122         if(num < 1)
123         {
124             freopen("/vob/ljsdpoenew3/exercise/debug_log", "r", fp);
125             fflush(fd);
126             continue;
127         }
128         fprintf(fd,"\n\nmy_diag>");
129         switch(args[0][0])
130         {
131             case ‘d‘:    //display
132                 switch(args[1][0])
133                 {
134                     case ‘q‘:   //display queue
135                     show_MQ(fd);
136                     break;
137                     case ‘d‘:   //display debug
138                     show_debug_level(fd);
139                     break;
140  
141                     default:
142                         help_manual(fd);
143                         break;
144                 }
145                 break;
146  
147             case ‘s‘:    //set
148                 switch(args[1][0])
149                 {
150                     case ‘d‘: //set debug level
151                     n = atoi(args[2]);
152                     fprintf(fd," debug level change from %d to %d",global.debug_level,n);
153                     global.debug_level = n;
154                     break;
155  
156                     default:
157                         help_manual(fd);
158                         break;
159                 }
160                 break;
161  
162             default:
163                 help_manual(fd);
164                 break;
165         }
166  
167     }
168 }