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//==========================================================================

//

//      lib/getserv.c

//

//      getservbyname(), getservbyport()

//

//==========================================================================

//####BSDCOPYRIGHTBEGIN####

//

// -------------------------------------------

//

// Portions of this software may have been derived from OpenBSD or other sources,

// and are covered by the appropriate copyright disclaimers included herein.

//

// -------------------------------------------

//

//####BSDCOPYRIGHTEND####

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    gthomas

// Contributors: gthomas

// Date:         2000-01-10

// Purpose:      

// Description:  

//              

//

//####DESCRIPTIONEND####

//

//==========================================================================

#include <sys/param.h>

#include <netdb.h>

#include <errno.h>

// These must return the port in network byte order.

//

// This means treated as a short, because it's a port, despite the types in

// the API and the struct being ints.

// 

// The argument to getservbyport() is also network byte order, so that code

// must change to flip before comparing.

static struct servent services[] = {

    { "ftp",      0,   21 , "tcp" },

    { "ftp-data", 0,   20 , "tcp" },

    { "domain",   0,   53 , "udp" },

    { "tftp",     0,   69 , "udp" },

    { "snmp",     0,  161 , "udp" },

    { NULL,       0,     0       , NULL  }

};

// Note that this contains no interlocking between clients of the

// interface; but this is completely typical of such APIs.

static struct servent *

setreturned( struct servent *p )

{

    static struct servent returned;

    returned.s_name     = p->s_name;

    returned.s_aliases  = p->s_aliases;

    returned.s_port     = htons(p->s_port); // return in net order

    returned.s_proto    = p->s_proto;

    return &returned;

}

struct servent *

getservbyname(const char *name, const char *proto)

{

    struct servent *p = services;

    while (p->s_name) {

        if ((strcmp(name, p->s_name) == 0) &&

            (strcmp(proto, p->s_proto) == 0)) {

            return setreturned(p);

        }

        p++;

    }

    errno = ENOENT;

    return (struct servent *)0;

}

struct servent *

getservbyport(const int num, const char *proto)

{

    struct servent *p = services;

    int port = ntohs(num);

    while (p->s_name) {

        if ((p->s_port == port) &&

            (strcmp(proto, p->s_proto) == 0)) {

            return setreturned(p);

        }

        p++;

    }

    errno = ENOENT;

    return (struct servent *)0;

}