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include GNUmakevars
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include GNUmakerules
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all: gethostbyname
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install: $(BINDIR)/gethostbyname
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clean:
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rm -f *.bak *.o core gethostbyname
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distclean: clean
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rm -f *.d
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-include *.d
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#include <netdb.h>
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#include <stdio.h>
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char *cmnd;
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void usage(void) {
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fprintf(stderr, "Usage: %s [hostname ...]\n", cmnd);
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exit(1);
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}
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int main(int argc, char **argv) {
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int i;
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int rc = 0;
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cmnd = argv[0];
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if (argc < 2) {
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usage();
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}
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for (i = 1; i < argc; i++) {
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struct hostent *he = gethostbyname(argv[i]);
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char **a;
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if (!he) {
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fprintf(stderr, "%s: cannot resolve %s: %s\n",
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argv[0], argv[i], hstrerror(h_errno));
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rc++;
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continue;
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}
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printf("%s\n", argv[i]);
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printf("\tCanonical: %s\n", he->h_name);
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for (a = he->h_aliases; *a; a++) {
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printf("\tAlias: %s\n", *a);
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}
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for (a = he->h_addr_list; *a; a++) {
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int j;
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printf("\tAddress: ");
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for (j = 0; j < he->h_length; j++) {
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printf("%s%d", j ? "." : "", (unsigned char)(*a)[j]);
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}
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printf("\n");
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}
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printf("\n");
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}
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return rc;
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}
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