diff options
Diffstat (limited to 'mxget.c')
| -rw-r--r-- | mxget.c | 39 |
1 files changed, 28 insertions, 11 deletions
@@ -6,7 +6,7 @@ * For license terms, see the file COPYING in this directory. */ -#include <config.h> +#include "config.h" #ifdef HAVE_GETHOSTBYNAME #include <netdb.h> #include <sys/types.h> @@ -19,26 +19,26 @@ * This ought to be in the bind library. It's adapted from sendmail. */ -int getmxrecords(name, nmx, pmx) +struct mxentry *getmxrecords(name) /* get MX records for given host */ -char *name; -int nmx; -struct mxentry *pmx; +const char *name; { unsigned char answer[PACKETSZ], MXHostBuf[PACKETSZ], *eom, *cp, *bp; int n, ancount, qdcount, buflen, type, pref, ind; + static struct mxentry pmx[(PACKETSZ - HFIXEDSZ) / sizeof(struct mxentry)]; HEADER *hp; n = res_search(name,C_IN,T_MX,(unsigned char*)&answer, sizeof(answer)); if (n == -1) - return(-1); + return((struct mxentry *)NULL); hp = (HEADER *)&answer; cp = answer + HFIXEDSZ; eom = answer + n; + h_errno = 0; for (qdcount = ntohs(hp->qdcount); qdcount--; cp += n + QFIXEDSZ) if ((n = dn_skipname(cp, eom)) < 0) - return(-1); + return((struct mxentry *)NULL); buflen = sizeof(MXHostBuf) - 1; bp = MXHostBuf; ind = 0; @@ -63,19 +63,36 @@ struct mxentry *pmx; pmx[ind].name = bp; pmx[ind].pref = pref; - if (++ind > nmx) - break; + ++ind; n = strlen(bp); bp += n; *bp++ = '\0'; - buflen -= n + 1; } - return(ind); + pmx[ind].name = (char *)NULL; + pmx[ind].pref = -1; + return(pmx); } #endif /* HAVE_GETHOSTBYNAME */ +#ifdef TESTMAIN +main(int argc, char *argv[]) +{ + int count, i; + struct mxentry *responses; + + responses = getmxrecords(argv[1]); + if (responses == (struct mxentry *)NULL) + puts("No MX records found"); + else + do { + printf("%s %d\n", responses->name, responses->pref); + } while + ((++responses)->name); +} +#endif /* TESTMAIN */ + /* mxget.c ends here */ |