Contents of /trunk/mkinitrd-magellan/busybox/libbb/create_icmp_socket.c
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Sat Sep 1 22:45:15 2007 UTC (17 years ago) by niro
File MIME type: text/plain
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Sat Sep 1 22:45:15 2007 UTC (17 years ago) by niro
File MIME type: text/plain
File size: 828 byte(s)
-import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Utility routines. |
4 | * |
5 | * create raw socket for icmp protocol test permission |
6 | * and drop root privileges if running setuid |
7 | * |
8 | */ |
9 | |
10 | #include <sys/types.h> |
11 | #include <netdb.h> |
12 | #include <sys/socket.h> |
13 | #include <errno.h> |
14 | #include <unistd.h> |
15 | #include "libbb.h" |
16 | |
17 | int create_icmp_socket(void) |
18 | { |
19 | struct protoent *proto; |
20 | int sock; |
21 | |
22 | proto = getprotobyname("icmp"); |
23 | /* if getprotobyname failed, just silently force |
24 | * proto->p_proto to have the correct value for "icmp" */ |
25 | if ((sock = socket(AF_INET, SOCK_RAW, |
26 | (proto ? proto->p_proto : 1))) < 0) { /* 1 == ICMP */ |
27 | if (errno == EPERM) |
28 | bb_error_msg_and_die(bb_msg_perm_denied_are_you_root); |
29 | else |
30 | bb_perror_msg_and_die(bb_msg_can_not_create_raw_socket); |
31 | } |
32 | |
33 | /* drop root privs if running setuid */ |
34 | xsetuid(getuid()); |
35 | |
36 | return sock; |
37 | } |