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Commit | Line | Data |
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a904c8c2 | 1 | /* |
a904c8c2 | 2 | * adds devmode and devgid to usbfs in fstab |
3 | * | |
4 | */ | |
5 | #include <sys/types.h> | |
6 | #include <sys/mman.h> | |
7 | #include <sys/stat.h> | |
8 | #include <unistd.h> | |
9 | #include <fcntl.h> | |
10 | #include <stdlib.h> | |
11 | #include <string.h> | |
12 | #include <signal.h> | |
13 | ||
14 | void eputs(const char *msg) | |
15 | { | |
16 | write(2, msg, strlen(msg)); | |
17 | } | |
18 | ||
19 | int main() | |
20 | { | |
21 | char *name = "/etc/fstab"; | |
22 | char *backup_name = "/etc/fstab.bak"; | |
b12a35e1 | 23 | char *add = ",devgid=78,devmode=0664"; |
a904c8c2 | 24 | |
25 | char *old; | |
e665ab23 | 26 | int fd; |
db127c35 | 27 | ssize_t i, old_sz; |
a904c8c2 | 28 | struct stat st; |
29 | ||
30 | eputs("Updating /etc/fstab..."); | |
31 | fd = open(name, O_RDONLY); | |
32 | if (fd < 0) { | |
33 | eputs("\nError: can't open file\n"); | |
34 | return 1; | |
35 | } | |
36 | fstat(fd, &st); | |
37 | old = (char *) malloc(st.st_size); | |
abae7e08 ER |
38 | if (old == NULL) { |
39 | eputs("\nError: malloc failure\n"); | |
40 | return 1; | |
41 | } | |
a904c8c2 | 42 | read(fd, old, st.st_size); |
43 | close(fd); | |
44 | old_sz = st.st_size; | |
45 | ||
46 | fd = open(backup_name, O_WRONLY|O_CREAT|O_TRUNC, 0600); | |
47 | if (fd < 0) { | |
48 | eputs("\nError: can't make backup\n"); | |
49 | return 2; | |
50 | } | |
51 | write(fd, old, old_sz); | |
52 | close(fd); | |
53 | ||
54 | // find usbfs | |
55 | for (i = 0; i < old_sz; i++) { | |
56 | if ( old[i] == 'u' && old[i+1] == 's' && old[i+2] == 'b' | |
57 | && old[i+3] == 'f' && old[i+4] == 's') | |
58 | break; | |
59 | } | |
60 | // find defau(lts) | |
61 | for (;i < old_sz; i++) { | |
62 | if ( old[i] == 'd' && old[i+1] == 'e' && old[i+2] == 'f' && old[i+3] == 'a' && old[i+4] == 'u' ) | |
63 | break; | |
64 | } | |
65 | // find first space | |
66 | for (;i < old_sz; i++) { | |
67 | if ( old[i] == ' ' || old[i] == '\t' ) | |
68 | break; | |
69 | } | |
70 | if ( i >= old_sz ) { | |
71 | eputs("\nError: can't find correct usbfs entry\n"); | |
314a24f0 | 72 | return 0; |
a904c8c2 | 73 | } |
74 | ||
f6f6f2cd | 75 | fd = open(name, O_WRONLY|O_CREAT|O_TRUNC, 0644); |
a904c8c2 | 76 | if (fd < 0) { |
77 | eputs("\nError: can't open file for writing\n"); | |
78 | return 4; | |
79 | } | |
80 | write(fd, old, i); | |
81 | write(fd, add, strlen(add)); | |
82 | write(fd, old + i, old_sz - i); | |
83 | close(fd); | |
84 | eputs("OK\n"); | |
85 | ||
86 | return 0; | |
87 | } | |
88 |