//==========================================================================
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//==========================================================================
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//
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//
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// lib/getserv.c
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// lib/getserv.c
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//
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//
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// getservbyname(), getservbyport()
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// getservbyname(), getservbyport()
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//
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//
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//==========================================================================
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//==========================================================================
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//####BSDCOPYRIGHTBEGIN####
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//####BSDCOPYRIGHTBEGIN####
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//
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//
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// -------------------------------------------
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// -------------------------------------------
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//
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//
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// Portions of this software may have been derived from OpenBSD or other sources,
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// Portions of this software may have been derived from OpenBSD or other sources,
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// and are covered by the appropriate copyright disclaimers included herein.
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// and are covered by the appropriate copyright disclaimers included herein.
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//
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//
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// -------------------------------------------
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// -------------------------------------------
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//
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//
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//####BSDCOPYRIGHTEND####
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//####BSDCOPYRIGHTEND####
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//==========================================================================
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//==========================================================================
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//#####DESCRIPTIONBEGIN####
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//#####DESCRIPTIONBEGIN####
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//
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//
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// Author(s): gthomas
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// Author(s): gthomas
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// Contributors: gthomas
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// Contributors: gthomas
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// Date: 2000-01-10
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// Date: 2000-01-10
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// Purpose:
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// Purpose:
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// Description:
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// Description:
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//
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//
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//
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//
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//####DESCRIPTIONEND####
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//####DESCRIPTIONEND####
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//
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//
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//==========================================================================
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//==========================================================================
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#include <sys/param.h>
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#include <sys/param.h>
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#include <netdb.h>
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#include <netdb.h>
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#include <errno.h>
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#include <errno.h>
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// These must return the port in network byte order.
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// These must return the port in network byte order.
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//
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//
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// This means treated as a short, because it's a port, despite the types in
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// This means treated as a short, because it's a port, despite the types in
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// the API and the struct being ints.
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// the API and the struct being ints.
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//
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//
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// The argument to getservbyport() is also network byte order, so that code
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// The argument to getservbyport() is also network byte order, so that code
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// must change to flip before comparing.
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// must change to flip before comparing.
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static struct servent services[] = {
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static struct servent services[] = {
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{ "ftp", 0, 21 , "tcp" },
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{ "ftp", 0, 21 , "tcp" },
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{ "ftp-data", 0, 20 , "tcp" },
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{ "ftp-data", 0, 20 , "tcp" },
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{ "domain", 0, 53 , "udp" },
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{ "domain", 0, 53 , "udp" },
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{ "tftp", 0, 69 , "udp" },
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{ "tftp", 0, 69 , "udp" },
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{ "snmp", 0, 161 , "udp" },
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{ "snmp", 0, 161 , "udp" },
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{ NULL, 0, 0 , NULL }
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{ NULL, 0, 0 , NULL }
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};
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};
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// Note that this contains no interlocking between clients of the
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// Note that this contains no interlocking between clients of the
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// interface; but this is completely typical of such APIs.
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// interface; but this is completely typical of such APIs.
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static struct servent *
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static struct servent *
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setreturned( struct servent *p )
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setreturned( struct servent *p )
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{
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{
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static struct servent returned;
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static struct servent returned;
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returned.s_name = p->s_name;
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returned.s_name = p->s_name;
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returned.s_aliases = p->s_aliases;
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returned.s_aliases = p->s_aliases;
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returned.s_port = htons(p->s_port); // return in net order
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returned.s_port = htons(p->s_port); // return in net order
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returned.s_proto = p->s_proto;
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returned.s_proto = p->s_proto;
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return &returned;
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return &returned;
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}
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}
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struct servent *
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struct servent *
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getservbyname(const char *name, const char *proto)
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getservbyname(const char *name, const char *proto)
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{
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{
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struct servent *p = services;
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struct servent *p = services;
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while (p->s_name) {
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while (p->s_name) {
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if ((strcmp(name, p->s_name) == 0) &&
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if ((strcmp(name, p->s_name) == 0) &&
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(strcmp(proto, p->s_proto) == 0)) {
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(strcmp(proto, p->s_proto) == 0)) {
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return setreturned(p);
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return setreturned(p);
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}
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}
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p++;
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p++;
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}
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}
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errno = ENOENT;
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errno = ENOENT;
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return (struct servent *)0;
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return (struct servent *)0;
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}
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}
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struct servent *
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struct servent *
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getservbyport(const int num, const char *proto)
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getservbyport(const int num, const char *proto)
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{
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{
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struct servent *p = services;
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struct servent *p = services;
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int port = ntohs(num);
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int port = ntohs(num);
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while (p->s_name) {
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while (p->s_name) {
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if ((p->s_port == port) &&
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if ((p->s_port == port) &&
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(strcmp(proto, p->s_proto) == 0)) {
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(strcmp(proto, p->s_proto) == 0)) {
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return setreturned(p);
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return setreturned(p);
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}
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}
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p++;
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p++;
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}
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}
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errno = ENOENT;
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errno = ENOENT;
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return (struct servent *)0;
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return (struct servent *)0;
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}
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}
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