3 * client.c -- connect to a server
11 #include <sys/socket.h>
12 #include <netinet/in.h>
15 #ifdef HAVE_ARPA_INET_H
16 # include <arpa/inet.h>
41 int a_addrtype; /* assumes AF_INET for inet_netof () */
48 #define a_net un.un_net
49 #define a_addr un.un_addr
51 static struct addrent *n1, *n2;
52 static struct addrent nets[MAXNETS];
53 static struct addrent *h1, *h2;
54 static struct addrent hosts[MAXHOSTS];
57 static CREDENTIALS cred;
58 static MSG_DAT msg_data;
59 static KTEXT ticket = (KTEXT) NULL;
60 static Key_schedule schedule;
61 static char *kservice; /* "pop" if using kpop */
62 char krb_realm[REALM_SZ];
63 char *PrincipalHostname();
66 #if defined(BIND) && !defined(h_addr)
67 # define h_addr h_addr_list[0]
70 #define inaddr_copy(hp,sin) \
71 memcpy(&((sin)->sin_addr), (hp)->h_addr, (hp)->h_length)
76 static int rcaux (struct servent *, struct hostent *, int, char *, int);
77 static int getport (int, int, char *, int);
78 static int inet (struct hostent *, int);
79 struct hostent *gethostbystring (char *s);
81 /* client's own static version of several nmh subroutines */
82 static char **client_brkstring (char *, char *, char *);
83 static int client_brkany (char, char *);
84 static char **client_copyip (char **, char **, int);
85 static char *client_getcpy (char *);
89 client (char *args, char *protocol, char *service, int rproto,
90 char *response, int len_response)
94 char *arguments[MAXARGS];
95 register struct hostent *hp;
96 register struct servent *sp;
98 register struct netent *np;
105 if (cp = strchr (service, '/')) { /* "pop/kpop" */
106 *cp++ = '\0'; /* kservice = "pop" */
107 service = cp; /* service = "kpop" */
109 kservice = NULL; /* not using KERBEROS */
114 if ((sp = getservbyname (service, protocol)) == NULL) {
116 if ((sp = hes_getservbyname (service, protocol)) == NULL) {
117 snprintf (response, len_response, "%s/%s: unknown service", protocol, service);
121 snprintf (response, len_response, "%s/%s: unknown service", protocol, service);
127 if (args != NULL && *args != 0) {
128 ap = client_copyip (client_brkstring (client_getcpy (args), " ", "\n"),
131 if (servers != NULL && *servers != 0)
132 ap = client_copyip (client_brkstring (client_getcpy (servers), " ", "\n"),
135 if (ap == arguments) {
136 *ap++ = client_getcpy ("localhost");
141 n2 = nets + sizeof(nets) / sizeof(nets[0]);
144 h2 = hosts + sizeof(hosts) / sizeof(hosts[0]);
146 for (ap = arguments; *ap; ap++) {
149 if ((np = getnetbyname (*ap + 1))) {
151 while ((hp = gethostent()))
152 if (np->n_addrtype == hp->h_addrtype
153 && inet (hp, np->n_net)) {
154 switch (sd = rcaux (sp, hp, rproto, response, len_response)) {
172 if ((hp = gethostbystring (*ap))) {
173 switch (sd = rcaux (sp, hp, rproto, response, len_response)) {
187 strncpy (response, "no servers available", len_response);
193 rcaux (struct servent *sp, struct hostent *hp, int rproto,
194 char *response, int len_response)
198 register struct addrent *ap;
199 struct sockaddr_in in_socket;
200 register struct sockaddr_in *isock = &in_socket;
206 for (ap = nets; ap < n1; ap++)
207 if (ap->a_addrtype == hp->h_addrtype && inet (hp, ap->a_net))
210 for (ap = hosts; ap < h1; ap++)
211 if (ap->a_addrtype == hp->h_addrtype
212 && memcmp(ap->a_addr, hp->h_addr, hp->h_length) == 0)
215 if ((sd = getport (rproto, hp->h_addrtype, response, len_response)) == NOTOK)
218 memset (isock, 0, sizeof(*isock));
219 isock->sin_family = hp->h_addrtype;
220 inaddr_copy (hp, isock);
221 isock->sin_port = sp->s_port;
223 if (connect (sd, (struct sockaddr *) isock, sizeof(*isock)) == NOTOK)
229 n1->a_addrtype = hp->h_addrtype;
230 memcpy(&in, hp->h_addr, sizeof(in));
231 n1->a_net = inet_netof (in);
241 h1->a_addrtype = hp->h_addrtype;
242 memcpy(h1->a_addr, hp->h_addr, hp->h_length);
249 if (kservice) { /* "pop" */
252 if ((instance = strdup (hp->h_name)) == NULL) {
254 strncpy (response, "Out of memory.", len_response);
257 ticket = (KTEXT) malloc (sizeof(KTEXT_ST));
258 rem = krb_sendauth (0L, sd, ticket, kservice, instance,
259 (char *) krb_realmofhost (instance),
260 (unsigned long) 0, &msg_data, &cred, schedule,
261 (struct sockaddr_in *) NULL,
262 (struct sockaddr_in *) NULL,
265 if (rem != KSUCCESS) {
267 strncpy (response, "Post office refused connection: ", len_response);
268 strncat (response, krb_err_txt[rem], len_response - strlen(response));
279 getport (int rproto, int addrtype, char *response, int len_response)
282 struct sockaddr_in in_socket, *isock;
285 if (rproto && addrtype != AF_INET) {
286 snprintf (response, len_response, "reserved ports not supported for af=%d", addrtype);
291 if ((sd = socket (AF_INET, SOCK_STREAM, 0)) == NOTOK) {
294 if ((s = strerror (errno)))
295 snprintf (response, len_response, "unable to create socket: %s", s);
297 snprintf (response, len_response, "unable to create socket: unknown error");
301 if (kservice) /* "pop" */
307 memset(isock, 0, sizeof(*isock));
308 isock->sin_family = addrtype;
309 for (port = IPPORT_RESERVED - 1;;) {
310 isock->sin_port = htons ((unsigned short) port);
311 if (bind (sd, (struct sockaddr *) isock, sizeof(*isock)) != NOTOK)
319 if (--port <= IPPORT_RESERVED / 2) {
320 strncpy (response, "ports available", len_response);
326 if ((s = strerror (errno)))
327 snprintf (response, len_response, "unable to bind socket: %s", s);
329 snprintf (response, len_response, "unable to bind socket: unknown error");
337 inet (struct hostent *hp, int net)
341 memcpy(&in, hp->h_addr, sizeof(in));
342 return (inet_netof (in) == net);
347 * taken from ISODE's compat/internet.c
350 static char *empty = NULL;
353 static char *addrs[2] = { NULL };
357 gethostbystring (char *s)
359 register struct hostent *h;
360 static struct hostent hs;
362 static struct in_addr iaddr;
364 static unsigned long iaddr;
367 iaddr = inet_addr (s);
369 if (iaddr.s_addr == NOTOK && strcmp (s, "255.255.255.255"))
371 if (((int) iaddr == NOTOK) && strcmp (s, "255.255.255.255"))
373 return gethostbyname (s);
377 h->h_aliases = ∅
378 h->h_addrtype = AF_INET;
379 h->h_length = sizeof(iaddr);
381 h->h_addr_list = addrs;
382 memset(addrs, 0, sizeof(addrs));
384 h->h_addr = (char *) &iaddr;
391 * static copies of three nmh subroutines
394 static char *broken[MAXARGS + 1];
397 client_brkstring (char *strg, char *brksep, char *brkterm)
400 register char c, *sp;
404 for (bi = 0; bi < MAXARGS; bi++) {
405 while (client_brkany (c = *sp, brksep))
407 if (!c || client_brkany (c, brkterm)) {
414 while ((c = *++sp) && !client_brkany (c, brksep) && !client_brkany (c, brkterm))
424 * returns 1 if chr in strg, 0 otherwise
427 client_brkany (char chr, char *strg)
432 for (sp = strg; *sp; sp++)
440 * copy a string array and return pointer to end
443 client_copyip (char **p, char **q, int len_q)
445 while (*p && --len_q > 0)
455 client_getcpy (char *str)
460 len = strlen(str) + 1;
461 if (!(cp = malloc(len)))
464 memcpy (cp, str, len);