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1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Utility routines.
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4 | *
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5 | * create raw socket for icmp protocol test permission
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6 | * and drop root privileges if running setuid
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7 | *
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8 | */
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9 |
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10 | //#include <sys/types.h>
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11 | //#include <netdb.h>
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12 | //#include <sys/socket.h>
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13 | #include "libbb.h"
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14 |
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15 | int create_icmp_socket(void)
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16 | {
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17 | struct protoent *proto;
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18 | int sock;
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19 |
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20 | proto = getprotobyname("icmp");
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21 | /* if getprotobyname failed, just silently force
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22 | * proto->p_proto to have the correct value for "icmp" */
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23 | sock = socket(AF_INET, SOCK_RAW,
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24 | (proto ? proto->p_proto : 1)); /* 1 == ICMP */
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25 | if (sock < 0) {
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26 | if (errno == EPERM)
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27 | bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
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28 | bb_perror_msg_and_die(bb_msg_can_not_create_raw_socket);
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29 | }
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30 |
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31 | /* drop root privs if running setuid */
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32 | xsetuid(getuid());
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33 |
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34 | return sock;
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35 | }
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