diff options
| -rw-r--r-- | crypter/simple_encoder.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/crypter/simple_encoder.c b/crypter/simple_encoder.c index 5ab4f66..abcd7d1 100644 --- a/crypter/simple_encoder.c +++ b/crypter/simple_encoder.c @@ -1,5 +1,7 @@ // #DECODER=./simple_decoder.o // #SHELLCODE=../shellcode/hello.o +#define _GNU_SOURCE 1 + #include <stdio.h> #include <string.h> #include <sys/time.h> @@ -16,6 +18,10 @@ #define _CRYPTVAL 200 #endif +#ifndef _OUTFILE +#define _OUTFILE "simple_encoded.o" +#endif + int getnumber(int n) @@ -49,6 +55,22 @@ print_code(const char *name, char *data, int len) printf("\";\n\n"); } +void +err_n_xit(const char *exit_msg, const char *arg) +{ + char *tmp; + if (arg != NULL) { + asprintf(&tmp, "%s('%s')", exit_msg, arg); + } else { + tmp = (char *) exit_msg; + } + perror(tmp); + if (arg != NULL) { + free(tmp); + } + exit(1); +} + int main(int argc, char **argv) { @@ -57,6 +79,7 @@ main(int argc, char **argv) int lshellcode = sizeof(shellcode)-1; /* same as above */ int first_arg = 1; char *result; + FILE *outfile; printf("/* Using value %d to encode the shellcode. */\n", number); printf("/* PRINT SHELLCODE */\n"); @@ -100,6 +123,13 @@ main(int argc, char **argv) *(result + ldecoder + lshellcode) = '\0'; print_code("result", result, ldecoder + lshellcode); + /* write2file */ + outfile = fopen(_OUTFILE, "w+b"); + if (outfile == NULL) err_n_xit("fopen", _OUTFILE); + if (fwrite((void *) result, sizeof(char), strlen(result), outfile) != strlen(result)) err_n_xit("fwrite", _OUTFILE); + if (fclose(outfile) != 0) err_n_xit("fclose", _OUTFILE); + fprintf(stderr, "outfile: %s\n", _OUTFILE); + free(result); return (0); } |