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38 lines
828 B
C
38 lines
828 B
C
/* vi: set sw=4 ts=4: */
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/*
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* Utility routines.
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*
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* create raw socket for icmp protocol test permission
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* and drop root privileges if running setuid
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*
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*/
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#include <sys/types.h>
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#include <netdb.h>
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#include <sys/socket.h>
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#include <errno.h>
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#include <unistd.h>
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#include "libbb.h"
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int create_icmp_socket(void)
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{
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struct protoent *proto;
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int sock;
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proto = getprotobyname("icmp");
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/* if getprotobyname failed, just silently force
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* proto->p_proto to have the correct value for "icmp" */
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if ((sock = socket(AF_INET, SOCK_RAW,
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(proto ? proto->p_proto : 1))) < 0) { /* 1 == ICMP */
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if (errno == EPERM)
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bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
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else
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bb_perror_msg_and_die(bb_msg_can_not_create_raw_socket);
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}
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/* drop root privs if running setuid */
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xsetuid(getuid());
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return sock;
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}
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