Android系統file_contexts二進位與文本轉換工具

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  1 #ifdef _WIN32  2     #define __USE_MINGW_ANSI_STDIO 1  3 #endif  4   5 #include <stdio.h>  6 #include <stdlib.h>  7 #include <string.h>  8 #include <errno.h>  9 #include <fcntl.h> 10 #ifdef HAS_STDINT_H 11     #include <stdint.h> 12 #endif 13 #ifdef unix 14     #include <unistd.h> 15     #include <sys/types.h> 16     #include <sys/stat.h> 17 #else 18     #include <direct.h> 19     #include <io.h> 20 #endif 21  22 #define MAGIC 0xF97CFF8A 23  24 #define S_IFMT      00170000 25 #define S_IFSOCK    0140000 26 #define S_IFLNK        0120000 27 #define S_IFREG        0100000 28 #define S_IFBLK        0060000 29 #define S_IFDIR        0040000 30 #define S_IFCHR        0020000 31 #define S_IFIFO        0010000 32 #define S_ISUID        0004000 33 #define S_ISGID        0002000 34 #define S_ISVTX        0001000 35  36 #define S_ISLNK(m)    (((m) & S_IFMT) == S_IFLNK) 37 #define S_ISREG(m)    (((m) & S_IFMT) == S_IFREG) 38 #define S_ISDIR(m)    (((m) & S_IFMT) == S_IFDIR) 39 #define S_ISCHR(m)    (((m) & S_IFMT) == S_IFCHR) 40 #define S_ISBLK(m)    (((m) & S_IFMT) == S_IFBLK) 41 #define S_ISFIFO(m)    (((m) & S_IFMT) == S_IFIFO) 42 #define S_ISSOCK(m)    (((m) & S_IFMT) == S_IFSOCK) 43  44 char *mode_to_string(unsigned int mode) 45 { 46     if (S_ISBLK(mode)) 47         return "-b"; 48     else if (S_ISCHR(mode)) 49         return "-c"; 50     else if (S_ISDIR(mode)) 51         return "-d"; 52     else if (S_ISFIFO(mode)) 53         return "-p"; 54     else if (S_ISLNK(mode)) 55         return "-l"; 56     else if (S_ISSOCK(mode)) 57         return "-s"; 58     else if (S_ISREG(mode)) 59         return "--"; 60     else 61         return ""; 62 } 63  64 int main(int argc, char *argv[]) 65 { 66     unsigned int selinux_vers; 67     unsigned int nothing; 68     unsigned int i; 69     unsigned int steams; 70     unsigned int num_of_regex; 71  72     char steam[256]; 73     char src[512]; 74     char context[512]; 75  76     FILE *fp = NULL; 77     FILE *fpout = NULL; 78  79     if (argc != 3) { 80         printf("usage: %s BINARY_FILE OUTPUT_TEXT_FILE\n", argv[0]); 81         printf("e.g: %s file_contexts.bin file_contexts\n", argv[0]); 82         return 1; 83     } 84  85     if ((fp = fopen(argv[1], "rb")) == NULL) { 86         printf("Unable to open %s : ", argv[1]); 87         perror(""); 88         return 1; 89     } 90     fread(&nothing, 1, 4, fp); 91     if (nothing != MAGIC) { 92         printf("%s is not a binary!\n", argv[1]); 93         if (fp) fclose(fp); 94         return 1; 95     } 96  97     fread(&nothing, 1, 4, fp); 98   selinux_vers = nothing; 99     fread(&nothing, 1, 4, fp);100     fseek(fp, (unsigned int)ftell(fp) + nothing, SEEK_SET);101 102     fread(&nothing, 1, 4, fp);103     //printf("num of steams: 0x%x\n", nothing);104 105     for (i=0; i<nothing; ++i) {106         fread(&steams, 1, 4, fp);107       fread(steam, 1, steams+1, fp);108         //printf("%s\n", steam);109     }110 111     fread(&num_of_regex, 1, 4, fp);112     //printf("num of regex: 0x%x\n", num_of_regex);113 114     if ((fpout = fopen(argv[2], "wb")) == NULL) {115         printf("unable to open %s for write!\n", argv[2]);116         if (fp) fclose(fp);117         return 1;118     }119 120   //printf("selinux version: %d\n", selinux_vers);121   fprintf(fpout, "#context version %d\n", selinux_vers);122 123     for (i=0; i<num_of_regex; ++i) {124         fread(&nothing, 1, 4, fp);125       fread(context, 1, nothing, fp);126     fread(&nothing, 1, 4, fp);127     fread(src, 1, nothing, fp);128         //printf("%s %s\n", src, context);129         fread(&nothing, 1, 4, fp);130         fprintf(fpout, "%s\t%s\t%s\n", src, mode_to_string(nothing), context);131       fseek(fp, (unsigned int)ftell(fp) + 12, SEEK_SET);132         fread(&nothing, 1, 4, fp);133     fseek(fp, (unsigned int)ftell(fp) + nothing, SEEK_SET);134         fread(&nothing, 1 , 4, fp);135     fread(&nothing, 1 , 4, fp);136     fseek(fp, (unsigned int)ftell(fp) + nothing - 4, SEEK_SET);137     }138 139     if (fp) fclose(fp);140     if (fpout) fclose(fpout);141 142     return 0;143 }

 

Android系統file_contexts二進位與文本轉換工具