diff options
Diffstat (limited to 'resolv/nss_dns/dns-host.c')
| -rw-r--r-- | resolv/nss_dns/dns-host.c | 92 |
1 files changed, 69 insertions, 23 deletions
diff --git a/resolv/nss_dns/dns-host.c b/resolv/nss_dns/dns-host.c index 4d46384ca7..078d452fd6 100644 --- a/resolv/nss_dns/dns-host.c +++ b/resolv/nss_dns/dns-host.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc. +/* Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc. This file is part of the GNU C Library. Extended from original form by Ulrich Drepper <drepper@cygnus.com>, 1996. @@ -116,6 +116,12 @@ typedef union querybuf u_char buf[MAXPACKET]; } querybuf; +/* These functions are defined in res_comp.c. */ +#define NS_MAXCDNAME 255 /* maximum compressed domain name */ +extern int __ns_name_ntop __P ((const u_char *, char *, size_t)); +extern int __ns_name_unpack __P ((const u_char *, const u_char *, + const u_char *, u_char *, size_t)); + static enum nss_status getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, @@ -315,6 +321,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, char tbuf[MAXDNAME]; const char *tname; int (*name_ok) __P ((const char *)); + u_char packtmp[NS_MAXCDNAME]; tname = qname; result->h_name = NULL; @@ -346,20 +353,27 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, return NSS_STATUS_UNAVAIL; } - n = dn_expand (answer->buf, end_of_message, cp, bp, linebuflen); - if (n < 0 || (*name_ok) (bp) == 0) + n = __ns_name_unpack (answer->buf, end_of_message, cp, + packtmp, sizeof packtmp); + if (n != -1 && __ns_name_ntop (packtmp, bp, linebuflen) == -1) { if (errno == EMSGSIZE) { - /* There is not enough room in the input buffer. */ *errnop = ERANGE; *h_errnop = NETDB_INTERNAL; + return NSS_STATUS_TRYAGAIN; } - else - { - *errnop = errno; - *h_errnop = NO_RECOVERY; - } + + n = -1; + } + + if (n > 0 && bp[0] == '.') + bp[0] = '\0'; + + if (n < 0 || (*name_ok) (bp) == 0) + { + *errnop = errno; + *h_errnop = NO_RECOVERY; return NSS_STATUS_UNAVAIL; } cp += n + QFIXEDSZ; @@ -396,7 +410,20 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, { int type, class; - n = dn_expand (answer->buf, end_of_message, cp, bp, linebuflen); + n = __ns_name_unpack (answer->buf, end_of_message, cp, + packtmp, sizeof packtmp); + if (n != -1 && __ns_name_ntop (packtmp, bp, linebuflen) == -1) + { + if (errno == EMSGSIZE) + { + *errnop = ERANGE; + *h_errnop = NETDB_INTERNAL; + return NSS_STATUS_TRYAGAIN; + } + + n = -1; + } + if (n < 0 || (*name_ok) (bp) == 0) { ++had_error; @@ -405,9 +432,9 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, cp += n; /* name */ type = _getshort (cp); cp += INT16SZ; /* type */ - class = _getshort(cp); + class = _getshort (cp); cp += INT16SZ + INT32SZ; /* class, TTL */ - n = _getshort(cp); + n = _getshort (cp); cp += INT16SZ; /* len */ if (class != C_IN) { @@ -444,8 +471,8 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, ++had_error; continue; } - result->h_name = strcpy (bp, tbuf); /* Cannot overflow. */ - bp += n; + result->h_name = bp; + bp = __mempcpy (bp, tbuf, n); /* Cannot overflow. */ linebuflen -= n; continue; } @@ -466,8 +493,8 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, ++had_error; continue; } - tname = strcpy (bp, tbuf); /* Cannot overflow. */ - bp += n; + tname = bp; + bp = __mempcpy (bp, tbuf, n); /* Cannot overflow. */ linebuflen -= n; continue; } @@ -493,13 +520,27 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, switch (type) { case T_PTR: - if (strcasecmp (tname, bp) != 0) + if (__strcasecmp (tname, bp) != 0) { syslog (LOG_NOTICE | LOG_AUTH, AskedForGot, qname, bp); cp += n; continue; /* XXX - had_error++ ? */ } - n = dn_expand (answer->buf, end_of_message, cp, bp, linebuflen); + + n = __ns_name_unpack (answer->buf, end_of_message, cp, + packtmp, sizeof packtmp); + if (n != -1 && __ns_name_ntop (packtmp, bp, linebuflen) == -1) + { + if (errno == EMSGSIZE) + { + *errnop = ERANGE; + *h_errnop = NETDB_INTERNAL; + return NSS_STATUS_TRYAGAIN; + } + + n = -1; + } + if (n < 0 || res_hnok (bp) == 0) { ++had_error; @@ -577,8 +618,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, cp += n; continue; } - memcpy (*hap++ = bp, cp, n); - bp += n; + bp = __mempcpy (*hap++ = bp, cp, n); cp += n; linebuflen -= n; break; @@ -606,10 +646,16 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, if (result->h_name == NULL) { n = strlen (qname) + 1; /* For the \0. */ - if (n > linebuflen || n >= MAXHOSTNAMELEN) + if (n > linebuflen) + { + *errnop = ERANGE; + *h_errnop = NETDB_INTERNAL; + return NSS_STATUS_TRYAGAIN; + } + if (n >= MAXHOSTNAMELEN) goto no_recovery; - result->h_name = strcpy (bp, qname); /* Cannot overflow. */ - bp += n; + result->h_name = bp; + bp = __mempcpy (bp, qname, n); /* Cannot overflow. */ linebuflen -= n; } |