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/cvs/fcrackzip/crack.c
Revision: 1.1
Committed: Mon Aug 4 07:09:50 2008 UTC (16 years, 4 months ago) by root
Content type: text/plain
Branch: MAIN
Log Message:
initial check-in, also 1.0 check-in

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