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64 lines
2.1 KiB
Diff
64 lines
2.1 KiB
Diff
--- qmail-1.03/dns.c.103 Mon Aug 17 16:06:58 1998
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+++ qmail-1.03/dns.c Wed Aug 26 16:28:56 1998
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@@ -21,10 +21,12 @@
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static unsigned short getshort(c) unsigned char *c;
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{ unsigned short u; u = c[0]; return (u << 8) + c[1]; }
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-static union { HEADER hdr; unsigned char buf[PACKETSZ]; } response;
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+static struct { unsigned char *buf; } response;
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+static int responsebuflen = 0;
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static int responselen;
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static unsigned char *responseend;
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static unsigned char *responsepos;
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+static u_long saveresoptions;
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static int numanswers;
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static char name[MAXDNAME];
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@@ -45,18 +47,33 @@
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errno = 0;
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if (!stralloc_copy(&glue,domain)) return DNS_MEM;
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if (!stralloc_0(&glue)) return DNS_MEM;
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- responselen = lookup(glue.s,C_IN,type,response.buf,sizeof(response));
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+ if (!responsebuflen)
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+ if (response.buf = (unsigned char *)alloc(PACKETSZ+1))
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+ responsebuflen = PACKETSZ+1;
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+ else return DNS_MEM;
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+
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+ responselen = lookup(glue.s,C_IN,type,response.buf,responsebuflen);
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+ if ((responselen >= responsebuflen) ||
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+ (responselen > 0 && (((HEADER *)response.buf)->tc)))
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+ {
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+ if (responsebuflen < 65536)
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+ if (alloc_re(&response.buf, responsebuflen, 65536))
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+ responsebuflen = 65536;
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+ else return DNS_MEM;
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+ saveresoptions = _res.options;
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+ _res.options |= RES_USEVC;
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+ responselen = lookup(glue.s,C_IN,type,response.buf,responsebuflen);
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+ _res.options = saveresoptions;
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+ }
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if (responselen <= 0)
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{
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if (errno == ECONNREFUSED) return DNS_SOFT;
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if (h_errno == TRY_AGAIN) return DNS_SOFT;
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return DNS_HARD;
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}
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- if (responselen >= sizeof(response))
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- responselen = sizeof(response);
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responseend = response.buf + responselen;
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responsepos = response.buf + sizeof(HEADER);
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- n = ntohs(response.hdr.qdcount);
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+ n = ntohs(((HEADER *)response.buf)->qdcount);
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while (n-- > 0)
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{
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i = dn_expand(response.buf,responseend,responsepos,name,MAXDNAME);
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@@ -66,7 +83,7 @@
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if (i < QFIXEDSZ) return DNS_SOFT;
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responsepos += QFIXEDSZ;
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}
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- numanswers = ntohs(response.hdr.ancount);
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+ numanswers = ntohs(((HEADER *)response.buf)->ancount);
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return 0;
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}
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