2 * $Id: send_to_kdc.c,v 1.4 2001-06-25 20:13:45 rufustfirefly Exp $
3 * $Author: rufustfirefly $
5 * Copyright (c) 1990,1994 Regents of The University of Michigan.
6 * All Rights Reserved. See COPYRIGHT.
8 * $Source: /home/ralph/netatalk/rsync/netatalk/etc/uams/uams_krb4/send_to_kdc.c,v $
10 * Copyright 1987, 1988 by the Massachusetts Institute of Technology.
12 * For copying and distribution information, please see the file
17 static char rcsid_send_to_kdc_c[] =
18 "$Id: send_to_kdc.c,v 1.4 2001-06-25 20:13:45 rufustfirefly Exp $";
23 #endif /* HAVE_CONFIG_H */
27 #include <mit-copyright.h>
36 #include <sys/types.h>
38 #include <sys/uio.h> /* struct iovec to make lint happy */
40 #include <sys/socket.h>
41 #include <netinet/in.h>
45 #define S_AD_SZ sizeof(struct sockaddr_in)
49 extern char *malloc(), *calloc(), *realloc();
53 /* CLIENT_KRB_TIMEOUT indicates the time to wait before
54 * retrying a server. It's defined in "krb.h".
56 static struct timeval timeout = { CLIENT_KRB_TIMEOUT, 0};
57 static char *prog = "send_to_kdc";
61 * This file contains two routines, send_to_kdc() and send_recv().
62 * send_recv() is a static routine used by send_to_kdc().
66 * send_to_kdc() sends a message to the Kerberos authentication
67 * server(s) in the given realm and returns the reply message.
68 * The "pkt" argument points to the message to be sent to Kerberos;
69 * the "rpkt" argument will be filled in with Kerberos' reply.
70 * The "realm" argument indicates the realm of the Kerberos server(s)
71 * to transact with. If the realm is null, the local realm is used.
73 * If more than one Kerberos server is known for a given realm,
74 * different servers will be queried until one of them replies.
75 * Several attempts (retries) are made for each server before
78 * If an answer was received from a Kerberos host, KSUCCESS is
79 * returned. The following errors can be returned:
81 * SKDC_CANT - can't get local realm
82 * - can't find "kerberos" in /etc/services database
86 * - couldn't find any Kerberos host
88 * SKDC_RETRY - couldn't get an answer from any Kerberos server,
89 * after several retries
92 send_to_kdc(pkt,rpkt,realm)
98 int no_host; /* was a kerberos host found? */
102 struct sockaddr_in to;
103 struct hostent *host, *hostlist;
105 char krbhst[MAX_HSTNM];
106 char lrealm[REALM_SZ];
109 * If "realm" is non-null, use that, otherwise get the
113 (void) strcpy(lrealm, realm);
115 if (krb_get_lrealm(lrealm,1)) {
117 fprintf(stderr, "%s: can't get local realm\n", prog);
121 printf("lrealm is %s\n", lrealm);
122 if (krb_udp_port == 0) {
123 register struct servent *sp;
124 if ((sp = getservbyname("kerberos","udp")) == 0) {
126 fprintf(stderr, "%s: Can't get kerberos/udp service\n",
130 krb_udp_port = sp->s_port;
132 printf("krb_udp_port is %d\n", krb_udp_port);
134 memset(&to, 0, S_AD_SZ);
135 hostlist = (struct hostent *) malloc(sizeof(struct hostent));
137 return (/*errno */SKDC_CANT);
138 if ((f = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
140 fprintf(stderr,"%s: Can't open socket\n", prog);
143 /* from now on, exit through rtn label for cleanup */
146 /* get an initial allocation */
148 for (i = 1; krb_get_krbhst(krbhst, lrealm, i) == KSUCCESS; ++i) {
150 printf("Getting host entry for %s...",krbhst);
151 (void) fflush(stdout);
153 host = gethostbyname(krbhst);
156 host ? "Got it" : "Didn't get it");
157 (void) fflush(stdout);
161 no_host = 0; /* found at least one */
163 /* preserve host network address to check later
164 * (would be better to preserve *all* addresses,
165 * take care of that later)
167 hostlist = (struct hostent *)
168 realloc((char *)hostlist,
170 sizeof(struct hostent)*(n_hosts+1));
172 return /*errno */SKDC_CANT;
173 memcpy(&hostlist[n_hosts-1], host, sizeof(struct hostent));
174 host = &hostlist[n_hosts-1];
175 cp = malloc((unsigned)host->h_length);
177 retval = /*errno */SKDC_CANT;
180 memcpy(cp, host->h_addr, host->h_length);
181 /* At least Sun OS version 3.2 (or worse) and Ultrix version 2.2
182 (or worse) only return one name ... */
183 #if !(defined(ULTRIX022) || (defined(SunOS) && SunOS < 40))
184 host->h_addr_list = (char **)malloc(sizeof(char *));
185 if (!host->h_addr_list) {
186 retval = /*errno */SKDC_CANT;
189 #endif /* ULTRIX022 || SunOS */
191 memset(&hostlist[n_hosts], 0, sizeof(struct hostent));
192 to.sin_family = host->h_addrtype;
193 memcpy(&to.sin_addr, host->h_addr, host->h_length);
194 to.sin_port = krb_udp_port;
195 if (send_recv(pkt, rpkt, f, &to, hostlist)) {
200 printf("Timeout, error, or wrong descriptor\n");
201 (void) fflush(stdout);
206 fprintf(stderr, "%s: can't find any Kerberos host.\n",
211 /* retry each host in sequence */
212 for (retry = 0; retry < CLIENT_KRB_RETRY; ++retry) {
213 for (host = hostlist; host->h_name != (char *)NULL; host++) {
214 to.sin_family = host->h_addrtype;
215 memcpy(&to.sin_addr, host->h_addr, host->h_length);
216 if (send_recv(pkt, rpkt, f, &to, hostlist)) {
226 register struct hostent *hp;
227 for (hp = hostlist; hp->h_name; hp++)
228 #if !(defined(ULTRIX022) || (defined(SunOS) && SunOS < 40))
229 if (hp->h_addr_list) {
230 #endif /* ULTRIX022 || SunOS */
233 #if !(defined(ULTRIX022) || (defined(SunOS) && SunOS < 40))
234 free((char *)hp->h_addr_list);
236 #endif /* ULTRIX022 || SunOS */
237 free((char *)hostlist);
243 * try to send out and receive message.
244 * return 1 on success, 0 on failure
247 static send_recv(pkt,rpkt,f,_to,addrs)
251 struct sockaddr_in *_to;
252 struct hostent *addrs;
255 register struct hostent *hp;
256 struct sockaddr_in from;
261 if (_to->sin_family == AF_INET)
262 printf("Sending message to %s...",
263 inet_ntoa(_to->sin_addr));
265 printf("Sending message...");
266 (void) fflush(stdout);
268 if ((numsent = sendto(f,(char *)(pkt->dat), pkt->length, 0,
269 (struct sockaddr *)_to,
270 S_AD_SZ)) != pkt->length) {
272 printf("sent only %d/%d\n",numsent, pkt->length);
276 printf("Sent\nWaiting for reply...");
277 (void) fflush(stdout);
282 /* select - either recv is ready, or timeout */
283 /* see if timeout or error or wrong descriptor */
284 if (select(f + 1, &readfds, (fd_set *)0, (fd_set *)0, &timeout) < 1
285 || !FD_ISSET(f, &readfds)) {
287 fprintf(stderr, "select failed: readfds=%x",
293 sin_size = sizeof(from);
294 if (( rc = recvfrom(f, (char *)(rpkt->dat), sizeof(rpkt->dat), 0,
295 (struct sockaddr *)&from, &sin_size)) < 0) {
302 printf("received packet from %s\n", inet_ntoa(from.sin_addr));
305 for (hp = addrs; hp->h_name != (char *)NULL; hp++) {
306 if (!memcmp(hp->h_addr, (char *)&from.sin_addr.s_addr,
309 printf("Received it\n");
310 (void) fflush(stdout);
316 "packet not from %x\n",
320 fprintf(stderr, "%s: received packet from wrong host! (%x)\n",
321 "send_to_kdc(send_rcv)", from.sin_addr.s_addr);
325 #endif /* UAM_AFSKRB */