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man pages for the DNS routines, too

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master
Felix von Leitner 21 years ago
parent 5a0d6b1ecb
commit a2ef9f358d
19 changed files with 275 additions and 8 deletions
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2
dns.h
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@ -70,7 +70,7 @@ extern struct dns_transmit dns_resolve_tx;
extern int dns_ip4_packet(stralloc *,const char *,unsigned int);
extern int dns_ip4(stralloc *,const stralloc *);
extern int dns_ip6_packet(stralloc *,char *,unsigned int);
extern int dns_ip6_packet(stralloc *,const char *,unsigned int);
extern int dns_ip6(stralloc *,stralloc *);
extern int dns_name_packet(stralloc *,const char *,unsigned int);
extern void dns_name4_domain(char *,const char *);

23
dns/dns_ip4.3
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@ -0,0 +1,23 @@
.TH dns_ip4 3
.SH NAME
dns_ip4 \- look up IPv4 addresses
.SH SYNTAX
.B #include <dns.h>
int \fBdns_ip4\fP(stralloc* \fIout\fR,stralloc* \fIfqdn\fR);
.SH DESCRIPTION
dns_ip4 looks up 4-byte IP addresses for the fully-qualified domain name in
\fIfqdn\fR. It puts the concatenation of the IP addresses into \fIout\fR and
returns 0. If the domain does not exist in DNS, or has no IP addresses,
\fIout\fR will be empty.
If dns_ip4 has trouble with the DNS lookup or runs out of memory, it returns
-1, setting errno appropriately. It may or may not change \fIout\fR.
If \fIfqdn\fR is a dotted-decimal IP address, dns_ip4 puts that IP address into
\fIout\fR without checking DNS. More generally, if \fIfqdn\fR is a
dot-separated sequence of dotted-decimal IP addresses, dns_ip4 puts those IP
addresses into out without checking DNS. Brackets may appear inside the
dotted-decimal IP addresses; they are ignored.
.SH "SEE ALSO"
dns_ip4_packet(3), dns_ip6(3), dns_name4(3)

16
dns/dns_ip4_packet.3
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@ -0,0 +1,16 @@
.TH dns_ip4_packet 3
.SH NAME
dns_ip4_packet \- extract IPv4 address from DNS answer packet
.SH SYNTAX
.B #include <dns.h>
int \fBdns_ip4_packet\fP(stralloc* \fIout\fR,const char* \fIbuf\fR,
unsigned int \fIlen\fR);
.SH DESCRIPTION
dns_ip4_packet is a low-level component of dns_ip4, designed to support
asynchronous DNS lookups. It reads a DNS packet of length \fIlen\fR from
\fIbuf\fR, extracts IP addresses from the answer section of the packet,
puts the addresses into \fIout\fR, and returns 0 or -1 the same way as
dns_ip4.
.SH "SEE ALSO"
dns_ip4(3), dns_ip6_packet(3)

22
dns/dns_ip4_qualify.3
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@ -0,0 +1,22 @@
.TH dns_ip4_qualify 3
.SH NAME
dns_ip4_qualify \- qualify name and look up IPv4 addresses
.SH SYNTAX
.B #include <dns.h>
int \fBdns_ip4_qualify\fP(stralloc* \fIout\fR,stralloc* \fIfqdn\fR,
const stralloc* \fIudn\fR);
.SH DESCRIPTION
dns_ip4_qualify feeds the name \fIudn\fR through qualification and looks up
4-byte IP addresses for the result. It puts the fully qualified domain name
into \fIfqdn\fR, puts the concatenation of the IP addresses into \fIout\fR, and
returns 0. If the domain does not exist in DNS, or has no IP addresses,
\fIout\fR will be empty.
If dns_ip4_qualify has trouble with the qualification, has trouble with DNS, or
runs out of memory, it returns -1, setting errno appropriately. It may or may
not change \fIout\fR and \fIfqdn\fR.
.SH QUALIFICATION
See http://cr.yp.to/djbdns/qualification.html
.SH "SEE ALSO"
dns_ip4(3), dns_ip4_packet(3), dns_ip6_qualify(3)

25
dns/dns_ip6.3
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@ -0,0 +1,25 @@
.TH dns_ip6 3
.SH NAME
dns_ip6 \- look up IPv4 addresses
.SH SYNTAX
.B #include <dns.h>
int \fBdns_ip6\fP(stralloc* \fIout\fR,stralloc* \fIfqdn\fR);
.SH DESCRIPTION
dns_ip6 looks up 16-byte IPv6 addresses for the fully-qualified domain name in
\fIfqdn\fR. It puts the concatenation of the IPv6 addresses into \fIout\fR and
returns 0. If the domain does not exist in DNS, or has no IP addresses,
\fIout\fR will be empty.
dns_ip6 also looks up 4-byte IPv4 addresses and converts them into
IPv4-mapped IPv6 addresses (::ffff:1.2.3.4) to provide easy backwards
compatibility for IPv6 applications.
If dns_ip6 has trouble with the DNS lookup or runs out of memory, it returns
-1, setting errno appropriately. It may or may not change \fIout\fR.
If \fIfqdn\fR is an IPv6 address, dns_ip6 puts that IP address into
\fIout\fR without checking DNS. IPv4 addresses are also used directly
without DNS lookup.
.SH "SEE ALSO"
dns_ip6_packet(3), dns_ip4(3), dns_name6(3)

4
dns/dns_ip6.c
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@ -5,7 +5,7 @@
#include "ip4.h"
#include "ip6.h"
static int dns_ip6_packet_add(stralloc *out,char *buf,unsigned int len)
static int dns_ip6_packet_add(stralloc *out,const char *buf,unsigned int len)
{
unsigned int pos;
char header[16];
@ -41,7 +41,7 @@ static int dns_ip6_packet_add(stralloc *out,char *buf,unsigned int len)
return 0;
}
int dns_ip6_packet(stralloc *out,char *buf,unsigned int len) {
int dns_ip6_packet(stralloc *out,const char *buf,unsigned int len) {
if (!stralloc_copys(out,"")) return -1;
return dns_ip6_packet_add(out,buf,len);
}

16
dns/dns_ip6_packet.3
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@ -0,0 +1,16 @@
.TH dns_ip6_packet 3
.SH NAME
dns_ip6_packet \- extract IPv6 address from DNS answer packet
.SH SYNTAX
.B #include <dns.h>
int \fBdns_ip6_packet\fP(stralloc* \fIout\fR,const char* \fIbuf\fR,
unsigned int \fIlen\fR);
.SH DESCRIPTION
dns_ip6_packet is a low-level component of dns_ip6, designed to support
asynchronous DNS lookups. It reads a DNS packet of length \fIlen\fR from
\fIbuf\fR, extracts IPv4 and IPv6 addresses from the answer section of
the packet, puts the addresses into \fIout\fR, and returns 0 or -1 the
same way as dns_ip6.
.SH "SEE ALSO"
dns_ip6(3), dns_ip4_packet(3)

26
dns/dns_ip6_qualify.3
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@ -0,0 +1,26 @@
.TH dns_ip6_qualify 3
.SH NAME
dns_ip6_qualify \- qualify name and look up IPv6 addresses
.SH SYNTAX
.B #include <dns.h>
int \fBdns_ip6_qualify\fP(stralloc* \fIout\fR,stralloc* \fIfqdn\fR,
const stralloc* \fIudn\fR);
.SH DESCRIPTION
dns_ip6_qualify feeds the name \fIudn\fR through qualification and looks up
16-byte IPv6 addresses for the result. It puts the fully qualified domain name
into \fIfqdn\fR, puts the concatenation of the IP addresses into \fIout\fR, and
returns 0. If the domain does not exist in DNS, or has no IP addresses,
\fIout\fR will be empty.
dns_ip6_qualify also looks up 4-byte IPv4 addresses and converts them
into IPv4-mapped IPv6 addresses (::ffff:1.2.3.4) to provide easy
backwards compatibility for IPv6 applications.
If dns_ip6_qualify has trouble with the qualification, has trouble with DNS, or
runs out of memory, it returns -1, setting errno appropriately. It may or may
not change \fIout\fR and \fIfqdn\fR.
.SH QUALIFICATION
See http://cr.yp.to/djbdns/qualification.html
.SH "SEE ALSO"
dns_ip6(3), dns_ip6_packet(3), dns_ip4_qualify(3)

18
dns/dns_mx.3
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@ -0,0 +1,18 @@
.TH dns_mx 3
.SH NAME
dns_mx \- look up Mail eXchanger
.SH SYNTAX
.B #include <dns.h>
int \fBdns_mx\fP(stralloc* \fIout\fR,stralloc* \fIfqdn\fR);
.SH DESCRIPTION
dns_ip4 looks up MX records for the fully-qualified domain name in
\fIfqdn\fR. It puts the MX records into \fIout\fR and returns 0. Each MX
record is a two-byte MX distance (big endian) followed by a
\\0-terminated dot-encoded domain name. If the domain does not exist in
DNS, or has no MX records, \fIout\fR will be empty.
If dns_mx has trouble with the DNS lookup or runs out of memory, it returns
-1, setting errno appropriately. It may or may not change \fIout\fR.
.SH "SEE ALSO"
dns_mx_packet(3), dns_ip4(3), dns_ip6(3)

15
dns/dns_mx_packet.3
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@ -0,0 +1,15 @@
.TH dns_mx_packet 3
.SH NAME
dns_mx_packet \- extract MX records from DNS answer packet
.SH SYNTAX
.B #include <dns.h>
int \fBdns_mx_packet\fP(stralloc* \fIout\fR,const char* \fIbuf\fR,
unsigned int \fIlen\fR);
.SH DESCRIPTION
dns_mx_packet is a low-level component of dns_mx, designed to support
asynchronous DNS lookups. It reads a DNS packet of length \fIlen\fR from \fIbuf\fR,
extracts the MX records from the answer section of the packet, puts the
result into \fIout\fR, and returns 0 or -1 the same way as dns_mx.
.SH "SEE ALSO"
dns_mx(3), dns_ip4(3), dns_ip6(3)

17
dns/dns_name4.3
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@ -0,0 +1,17 @@
.TH dns_name4 3
.SH NAME
dns_name4 \- look up host name
.SH SYNTAX
.B #include <dns.h>
int \fBdns_name4\fP(stralloc* \fIout\fR,const char* \fIip\fR[4]);
.SH DESCRIPTION
dns_name4 looks up the domain name for the 4-byte IP address in \fIip\fR. It
puts the (first) domain name into \fIout\fR and returns 0. If the relevant
in-addr.arpa domain does not exist in DNS, or has no PTR records, \fIout\fR
will be empty.
If dns_name4 has trouble with the DNS lookup or runs out of memory, it returns
-1, setting errno appropriately. It may or may not change \fIout\fR.
.SH "SEE ALSO"
dns_name_packet(3), dns_name4_domain(3), dns_name6(3), dns_ip4(3)

14
dns/dns_name4_domain.3
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@ -0,0 +1,14 @@
.TH dns_name4_domain 3
.SH NAME
dns_name4_domain \- construct host name for reverse lookup
.SH SYNTAX
.B #include <dns.h>
int \fBdns_name4_domain\fP(char \fIq\fR[DNS_NAME4_DOMAIN],
const char* \fIip\fR[4]);
.SH DESCRIPTION
dns_name4_domain is a low-level component of dns_name4. It converts an
IP address such as 1.2.3.4 into a domain name such as
4.3.2.1.in-addr.arpa and places the packet-encoded domain name into \fIq\fR.
.SH "SEE ALSO"
dns_name4(3), dns_name6_domain(3)

17
dns/dns_name6.3
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@ -0,0 +1,17 @@
.TH dns_name6 3
.SH NAME
dns_name6 \- look up host name
.SH SYNTAX
.B #include <dns.h>
int \fBdns_name6\fP(stralloc* \fIout\fR,const char* \fIip\fR[16]);
.SH DESCRIPTION
dns_name6 looks up the domain name for the 16-byte IPv6 address in \fIip\fR. It
puts the (first) domain name into \fIout\fR and returns 0. If the relevant
ip6.int domain does not exist in DNS, or has no PTR records, \fIout\fR
will be empty.
If dns_name4 has trouble with the DNS lookup or runs out of memory, it returns
-1, setting errno appropriately. It may or may not change \fIout\fR.
.SH "SEE ALSO"
dns_name_packet(3), dns_name6_domain(3), dns_name4(3), dns_ip6(3)

15
dns/dns_name6_domain.3
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@ -0,0 +1,15 @@
.TH dns_name6_domain 3
.SH NAME
dns_name6_domain \- construct host name for reverse lookup
.SH SYNTAX
.B #include <dns.h>
int \fBdns_name6_domain\fP(char \fIq\fR[DNS_NAME6_DOMAIN],
const char* \fIip\fR[16]);
.SH DESCRIPTION
dns_name6_domain is a low-level component of dns_name6. It converts an
IP address such as 4321:0:1:2:3:4:567:89ab into a domain name such as
b.a.9.8.7.6.5.0.4.0.0.0.3.0.0.0.2.0.0.0.1.0.0.0.0.0.0.0.1.2.3.4.IP6.INT
and places the packet-encoded domain name into \fIq\fR.
.SH "SEE ALSO"
dns_name6(3), dns_name4_domain(3)

15
dns/dns_name_packet.3
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@ -0,0 +1,15 @@
.TH dns_name_packet 3
.SH NAME
dns_name_packet \- extract names from DNS answer packet
.SH SYNTAX
.B #include <dns.h>
int \fBdns_name_packet\fP(stralloc* \fIout\fR,const char* \fIbuf\fR,
unsigned int \fIlen\fR);
.SH DESCRIPTION
dns_name_packet is a low-level component of dns_name4, designed to support
asynchronous DNS lookups. It reads a DNS packet of length \fIlen\fR from \fIbuf\fR,
extracts the first PTR record from the answer section of the packet, puts the
result into \fIout\fR, and returns 0 or -1 the same way as dns_name4.
.SH "SEE ALSO"
dns_name4(3), dns_name4(3), dns_ip4_packet(3)

17
dns/dns_txt.3
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@ -0,0 +1,17 @@
.TH dns_txt 3
.SH NAME
dns_txt \- look up TXT records
.SH SYNTAX
.B #include <dns.h>
int \fBdns_txt\fP(stralloc* \fIout\fR,stralloc* \fIfqdn\fR);
.SH DESCRIPTION
dns_ip4 looks up TXT records for the fully-qualified domain name in
\fIfqdn\fR. It puts the concatenation of the TXT records into \fIout\fR
and returns 0. If the domain does not exist in DNS, or has no TXT
records, \fIout\fR will be empty.
If dns_txt has trouble with the DNS lookup or runs out of memory, it returns
-1, setting errno appropriately. It may or may not change \fIout\fR.
.SH "SEE ALSO"
dns_txt_packet(3)

15
dns/dns_txt_packet.3
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@ -0,0 +1,15 @@
.TH dns_txt_packet 3
.SH NAME
dns_txt_packet \- extract TXT records from DNS answer packet
.SH SYNTAX
.B #include <dns.h>
int \fBdns_txt_packet\fP(stralloc* \fIout\fR,const char* \fIbuf\fR,
unsigned int \fIlen\fR);
.SH DESCRIPTION
dns_txt_packet is a low-level component of dns_mx, designed to support
asynchronous DNS lookups. It reads a DNS packet of length \fIlen\fR from \fIbuf\fR,
extracts the TXT records from the answer section of the packet, puts the
result into \fIout\fR, and returns 0 or -1 the same way as dns_mx.
.SH "SEE ALSO"
dns_mx(3)

2
t.c
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@ -24,8 +24,6 @@
int main(int argc,char* argv[]) {
printf("%d\n",case_starts("fnordhausen","FnOrD"));
printf("%d\n",case_starts("fnordhausen","blah"));
printf("%d\n",case_startb("fnordhausen",5,"FnOrD"));
printf("%d\n",case_startb("fnordhausen",1,"foo"));
#if 0
char buf[]="FnOrD";
case_lowers(buf);

4
taia/taia_unpack.c
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@ -1,8 +1,6 @@
#include "taia.h"
void taia_unpack(s,t)
char *s;
struct taia *t;
void taia_unpack(const char* s,struct taia* t)
{
unsigned long x;

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