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- Contenidos - SET Staff
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Fuentes Extract
Autor: SET Staff
-[ 0x13 ]-------------------------------------------------------------------- -[ SET-EXT ]----------------------------------------------------------------- -[ by SET Staff ]-----------------------------------------------------SET-17- Hasta el momento os hemos venido ofrecion una version modificada del programa de extraccion de ficheros desarrollado originariamente por Route, y como no, publicado en la Phrack. En este numero vamos a dar un peque~o giro, publicando la version original del programa en C. En la Phrack 53 podeis conseguir versiones en PERL, Awk, Shell script e incluso Python. Se que muchos os estareis preguntando porque si llevamos dando tanto tiempo la version modificada ahora os damos el original. La respuesta, en SET 18 ;> <++> utils/extract2.c /* extract.c by Phrack Staff and sirsyko * * (c) Phrack Magazine, 1997 * 1.8.98 rewritten by route: * - aesthetics * - now accepts file globs * todo: * - more info in tag header (file mode, checksum) * Extracts textfiles from a specially tagged flatfile into a hierarchical * directory strcuture. Use to extract source code from any of the articles * in Phrack Magazine (first appeared in Phrack 50). * * gcc -o extract extract.c * * ./extract file1 file2 file3 ... */ #include <stdio.h> #include <stdlib.h> #include <sys/stat.h> #include <string.h> #include <dirent.h> #define BEGIN_TAG "<++> " #define END_TAG "<-->" #define BT_SIZE strlen(BEGIN_TAG) #define ET_SIZE strlen(END_TAG) struct f_name { u_char name[256]; struct f_name *next; }; int main(int argc, char **argv) { u_char b[256], *bp, *fn; int i, j = 0; FILE *in_p, *out_p = NULL; struct f_name *fn_p = NULL, *head = NULL; if (argc < 2) { printf("Usage: %s file1 file2 ... filen\n", argv[0]); exit(0); } /* * Fill the f_name list with all the files on the commandline (ignoring * argv[0] which is this executable). This includes globs. */ for (i = 1; (fn = argv[i++]); ) { if (!head) { if (!(head = (struct f_name *)malloc(sizeof(struct f_name)))) { perror("malloc"); exit(1); } strncpy(head->name, fn, sizeof(head->name)); head->next = NULL; fn_p = head; } else { if (!(fn_p->next = (struct f_name *)malloc(sizeof(struct f_name)))) { perror("malloc"); exit(1); } fn_p = fn_p->next; strncpy(fn_p->name, fn, sizeof(fn_p->name)); fn_p->next = NULL; } } /* * Sentry node. */ if (!(fn_p->next = (struct f_name *)malloc(sizeof(struct f_name)))) { perror("malloc"); exit(1); } fn_p = fn_p->next; fn_p->next = NULL; /* * Check each file in the f_name list for extraction tags. */ for (fn_p = head; fn_p->next; fn_p = fn_p->next) { if (!(in_p = fopen(fn_p->name, "r"))) { fprintf(stderr, "Could not open input file %s.\n", fn_p->name); continue; } else fprintf(stderr, "Opened %s\n", fn_p->name); while (fgets(b, 256, in_p)) { if (!strncmp (b, BEGIN_TAG, BT_SIZE)) { b[strlen(b) - 1] = 0; /* Now we have a string. */ j++; if ((bp = strchr(b + BT_SIZE + 1, '/'))) { while (bp) { *bp = 0; mkdir(b + BT_SIZE, 0700); *bp = '/'; bp = strchr(bp + 1, '/'); } } if ((out_p = fopen(b + BT_SIZE, "w"))) { printf("- Extracting %s\n", b + BT_SIZE); } else { printf("Could not extract '%s'.\n", b + BT_SIZE); continue; } } else if (!strncmp (b, END_TAG, ET_SIZE)) { if (out_p) fclose(out_p); else { fprintf(stderr, "Error closing file %s.\n", fn_p->name); continue; } } else if (out_p) { fputs(b, out_p); } } } if (!j) printf("No extraction tags found in list.\n"); else printf("Extracted %d file(s).\n", j); return (0); } /* EOF */ <-->