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Diffstat (limited to 'src/lib/krb5/os/send524.c')
| -rw-r--r-- | src/lib/krb5/os/send524.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/src/lib/krb5/os/send524.c b/src/lib/krb5/os/send524.c new file mode 100644 index 0000000..0ca8e93 --- /dev/null +++ b/src/lib/krb5/os/send524.c @@ -0,0 +1,111 @@ +/* + * Copyright 1990,1991,1997 by the Massachusetts Institute of Technology. + * All Rights Reserved. + * + * Export of this software from the United States of America may + * require a specific license from the United States Government. + * It is the responsibility of any person or organization contemplating + * export to obtain such a license before exporting. + * + * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and + * distribute this software and its documentation for any purpose and + * without fee is hereby granted, provided that the above copyright + * notice appear in all copies and that both that copyright notice and + * this permission notice appear in supporting documentation, and that + * the name of M.I.T. not be used in advertising or publicity pertaining + * to distribution of the software without specific, written prior + * permission. Furthermore if you modify this software you must label + * your software as modified software and not distribute it in such a + * fashion that it might be confused with the original M.I.T. software. + * M.I.T. makes no representations about the suitability of + * this software for any purpose. It is provided "as is" without express + * or implied warranty. + * + * Send a packet to a service and await a reply, using an exponential + * backoff retry algorithm. This is based on krb5_sendto_kdc. + */ + +/* Grab socket stuff. This might want to go away later. */ +#define NEED_SOCKETS +#define NEED_LOWLEVEL_IO +#include "fake-addrinfo.h" /* for custom addrinfo if needed */ +#include "k5-int.h" + +#ifndef _WIN32 +#include <unistd.h> +#include <sys/time.h> +#endif + +#include <stdlib.h> +#include <string.h> + +#include "os-proto.h" + +/* + * krb524_sendto_kdc: + * + * A slightly modified version of krb5_sendto_kdc. + * + * send the formatted request 'message' to a KDC for realm 'realm' and + * return the response (if any) in 'reply'. + * + * If the message is sent and a response is received, 0 is returned, + * otherwise an error code is returned. + * + * The storage for 'reply' is allocated and should be freed by the caller + * when finished. + */ + +krb5_error_code +krb5int_524_sendto_kdc (context, message, realm, reply, addr, addrlen) + krb5_context context; + const krb5_data * message; + const krb5_data * realm; + krb5_data * reply; + struct sockaddr *addr; + socklen_t *addrlen; +{ +#if defined(KRB5_KRB4_COMPAT) || defined(_WIN32) /* yuck! */ + int i; + struct addrlist al = ADDRLIST_INIT; + struct servent *serv; + krb5_error_code retval; + int port; + + /* + * find KDC location(s) for realm + */ + + serv = getservbyname(KRB524_SERVICE, "udp"); + port = serv ? serv->s_port : htons (KRB524_PORT); + + retval = krb5int_locate_server(context, realm, &al, 0, + "krb524_server", "_krb524", + SOCK_DGRAM, port, + 0, PF_INET); + if (retval == KRB5_REALM_CANT_RESOLVE || retval == KRB5_REALM_UNKNOWN) { + /* Fallback heuristic: Assume krb524 port on every KDC might + work. */ + retval = krb5_locate_kdc(context, realm, &al, 0, SOCK_DGRAM, PF_INET); + /* + * Bash the ports numbers. + */ + if (retval == 0) + for (i = 0; i < al.naddrs; i++) { + al.addrs[i]->ai_socktype = SOCK_DGRAM; + if (al.addrs[i]->ai_family == AF_INET) + sa2sin (al.addrs[i]->ai_addr)->sin_port = port; + } + } + if (retval) + return retval; + if (al.naddrs == 0) + return KRB5_REALM_UNKNOWN; + + retval = krb5int_sendto (context, message, &al, reply, addr, addrlen); + krb5int_free_addrlist (&al); + return retval; +#else + return KRB524_KRB4_DISABLED; +#endif +} |