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/cvs/fcrackzip/crack.c
Revision: 1.2
Committed: Thu Oct 9 07:45:07 2008 UTC (16 years ago) by root
Content type: text/plain
Branch: MAIN
CVS Tags: HEAD
Changes since 1.1: +14 -6 lines
Log Message:
*** empty log message ***

File Contents

# User Rev Content
1 root 1.1 #ifdef HAVE_CONFIG_H
2     #include "config.h"
3     #endif
4    
5     #include <stdio.h>
6     #include <errno.h>
7     #include <string.h>
8     #include "crack.h"
9    
10     u8 pw[MAX_PW + 1] = "aaaaaa";
11     u8 *pw_end; /* must point to the trailing zero byte. */
12    
13     u8 files[MAX_FILES * HEADER_SIZE];
14     const char *file_path[MAX_FILES];
15     int file_count;
16    
17     u8 bf_next[256];
18     u8 bf_last;
19    
20     int verbosity;
21    
22     static u8 mult_tab[16384];
23    
24     static u32
25     fgetu32 (FILE * f)
26     {
27 root 1.2 register u32 r;
28    
29     r = fgetc(f) << 0;
30     r |= fgetc(f) << 8;
31     r |= fgetc(f) << 16;
32     r |= fgetc(f) << 24;
33    
34     return r;
35 root 1.1 }
36    
37     static u32
38     fgetu16 (FILE * f)
39     {
40 root 1.2 register u32 r;
41    
42     r = fgetc(f) << 0;
43     r |= fgetc(f) << 8;
44    
45     return r;
46 root 1.1 }
47    
48     static void
49     load_zip (const char *path)
50     {
51     FILE *f = fopen (path, "rb");
52    
53     if (!f)
54     {
55     fprintf (stderr, "skipping '%s': %s\n", path, strerror (errno));
56     return;
57     }
58    
59     while (!feof (f))
60     {
61     u32 id = fgetu32 (f);
62    
63     if (id == 0x04034b50UL)
64     {
65     u16 version = fgetu16 (f);
66     u16 flags = fgetu16 (f);
67     u16 compression_method = fgetu16 (f);
68     u16 lastmodtime = fgetu16 (f);
69     u16 lastmoddate = fgetu16 (f);
70     u32 crc32 = fgetu32 (f);
71     u32 compr_size = fgetu32 (f);
72     u32 uncompr_size = fgetu32 (f);
73     u16 name_len = fgetu16 (f);
74     u16 extra_field_len = fgetu16 (f);
75    
76     char zip_path[1024];
77    
78     /* these are unused. */
79     (void) lastmoddate;
80     (void) lastmodtime;
81     (void) compression_method;
82     (void) version;
83    
84     if (name_len < 1024)
85     {
86     fread (zip_path, name_len, 1, f);
87     zip_path[name_len] = 0;
88     }
89     else
90     {
91     fprintf (stderr, "filename too long (>1023 bytes), skipping zipfile\n");
92     goto out;
93     }
94    
95     fseek (f, extra_field_len, SEEK_CUR);
96    
97     if (flags & 1)
98     {
99     if (compr_size >= 12)
100     {
101     u8 *file = files + HEADER_SIZE * file_count;
102     fread (file, FILE_SIZE, 1, f);
103    
104     if (flags & 8)
105     {
106     /* extended header format? */
107     file[FILE_SIZE] = lastmodtime >> 8;
108     file[FILE_SIZE + 1] = lastmodtime;
109     }
110     else
111     {
112     file[FILE_SIZE] = crc32 >> 24;
113     file[FILE_SIZE + 1] = crc32 >> 16;
114     }
115    
116     file_path[file_count] = strdup (path);
117    
118     if (verbosity)
119     printf ("found file '%s', (size cp/uc %6lu/%6lu, flags %lx, chk %02x%02x)\n",
120     zip_path, (unsigned long) compr_size, (unsigned long) uncompr_size, (unsigned long) flags,
121     file[FILE_SIZE], file[FILE_SIZE+1]);
122    
123     if (++file_count >= MAX_FILES)
124     {
125     if (verbosity)
126     printf ("%d file maximum reached, skipping further files\n", MAX_FILES);
127    
128     goto out;
129     }
130    
131     compr_size -= 12;
132     }
133     else
134     {
135     fprintf (stderr, "'%s' is corrupted, skipping zipfile\n", zip_path);
136     goto out;
137     }
138     }
139     else if (verbosity)
140     printf ("'%s' is not encrypted, skipping\n", zip_path);
141    
142     fseek (f, compr_size, SEEK_CUR);
143     }
144     else if (id == 0x08074b50UL) /* extended local sig (?) */
145     {
146     fseek (f, 12, SEEK_CUR);
147     }
148     else if (id == 0x30304b50UL)
149     {
150     /* ignore */
151     }
152     else if (id == 0x02014b50UL || id == 0x06054b50UL)
153     {
154     goto out;
155     }
156     else
157     {
158     fprintf (stderr, "found id %08lx, '%s' is not a zipfile ver 2.xx, skipping\n",
159     (unsigned long) id, path);
160     goto out;
161     }
162     }
163    
164     out:
165     fclose (f);
166     }
167    
168     #include "cpmask.c"
169     #include "crackdef.c"