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118 lines
2.1 KiB
C
118 lines
2.1 KiB
C
/*
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* lookup.c - Lookup IP address, HW address, netmask
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/time.h> /* for struct timeval in net/if.h */
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#include <net/if.h>
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#include <netinet/in.h>
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#ifdef ETC_ETHERS
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#include <net/ethernet.h>
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#endif
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#include <netdb.h>
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#include <strings.h>
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#include <syslog.h>
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#include "bootp.h"
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#include "lookup.h"
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#include "report.h"
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/*
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* Lookup an Ethernet address and return it.
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* Return NULL if addr not found.
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*/
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u_char *
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lookup_hwa(char *hostname, int htype)
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{
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switch (htype) {
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/* XXX - How is this done on other systems? -gwr */
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#ifdef ETC_ETHERS
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case HTYPE_ETHERNET:
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case HTYPE_IEEE802:
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{
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static struct ether_addr ea;
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/* This does a lookup in /etc/ethers */
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if (ether_hostton(hostname, &ea)) {
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report(LOG_ERR, "no HW addr for host \"%s\"",
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hostname);
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return (u_char *) 0;
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}
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return (u_char *) & ea;
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}
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#endif /* ETC_ETHERS */
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default:
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report(LOG_ERR, "no lookup for HW addr type %d", htype);
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} /* switch */
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/* If the system can't do it, just return an error. */
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return (u_char *) 0;
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}
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/*
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* Lookup an IP address.
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* Return non-zero on failure.
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*/
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int
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lookup_ipa(char *hostname, u_int32 *result)
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{
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struct hostent *hp;
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hp = gethostbyname(hostname);
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if (!hp)
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return -1;
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bcopy(hp->h_addr, result, sizeof(*result));
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return 0;
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}
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/*
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* Lookup a netmask
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* Return non-zero on failure.
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*
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* XXX - This is OK as a default, but to really make this automatic,
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* we would need to get the subnet mask from the ether interface.
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* If this is wrong, specify the correct value in the bootptab.
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*
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* Both arguments are in network order
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*/
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int
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lookup_netmask(u_int32 addr, u_int32 *result)
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{
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int32 m, a;
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a = ntohl(addr);
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m = 0;
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if (IN_CLASSA(a))
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m = IN_CLASSA_NET;
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if (IN_CLASSB(a))
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m = IN_CLASSB_NET;
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if (IN_CLASSC(a))
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m = IN_CLASSC_NET;
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if (!m)
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return -1;
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*result = htonl(m);
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return 0;
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}
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/*
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* Local Variables:
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* tab-width: 4
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* c-indent-level: 4
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* c-argdecl-indent: 4
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* c-continued-statement-offset: 4
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* c-continued-brace-offset: -4
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* c-label-offset: -4
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* c-brace-offset: 0
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* End:
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*/
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