3 * client.c -- connect to a server
7 * This code is Copyright (c) 2002, by the authors of nmh. See the
8 * COPYRIGHT file in the root directory of the nmh distribution for
9 * complete copyright information.
15 #include <sys/socket.h>
16 #include <netinet/in.h>
19 #ifdef HAVE_ARPA_INET_H
20 # include <arpa/inet.h>
43 int a_addrtype; /* assumes AF_INET for inet_netof () */
50 #define a_net un.un_net
51 #define a_addr un.un_addr
53 static struct addrent *n1, *n2;
54 static struct addrent nets[MAXNETS];
55 static struct addrent *h1, *h2;
56 static struct addrent hosts[MAXHOSTS];
59 static CREDENTIALS cred;
60 static MSG_DAT msg_data;
61 static KTEXT ticket = (KTEXT) NULL;
62 static Key_schedule schedule;
63 static char *kservice; /* "pop" if using kpop */
64 char krb_realm[REALM_SZ];
65 char *PrincipalHostname();
69 # define h_addr h_addr_list[0]
72 #define inaddr_copy(hp,sin) \
73 memcpy(&((sin)->sin_addr), (hp)->h_addr, (hp)->h_length)
78 static int rcaux (struct servent *, struct hostent *, int, char *, int);
79 static int getport (int, int, char *, int);
80 static int inet (struct hostent *, int);
81 struct hostent *gethostbystring (char *s);
83 /* client's own static version of several nmh subroutines */
84 static char **client_brkstring (char *, char *, char *);
85 static int client_brkany (char, char *);
86 static char **client_copyip (char **, char **, int);
87 static char *client_getcpy (char *);
91 client (char *args, char *protocol, char *service, int rproto,
92 char *response, int len_response)
96 char *arguments[MAXARGS];
97 register struct hostent *hp;
98 register struct servent *sp;
99 #ifndef HAVE_GETHOSTBYNAME
100 register struct netent *np;
107 if (cp = strchr (service, '/')) { /* "pop/kpop" */
108 *cp++ = '\0'; /* kservice = "pop" */
109 service = cp; /* service = "kpop" */
111 kservice = NULL; /* not using KERBEROS */
116 if ((sp = getservbyname (service, protocol)) == NULL) {
118 if ((sp = hes_getservbyname (service, protocol)) == NULL) {
119 snprintf (response, len_response, "%s/%s: unknown service", protocol, service);
123 snprintf (response, len_response, "%s/%s: unknown service", protocol, service);
129 if (args != NULL && *args != 0) {
130 ap = client_copyip (client_brkstring (client_getcpy (args), " ", "\n"),
133 if (servers != NULL && *servers != 0)
134 ap = client_copyip (client_brkstring (client_getcpy (servers), " ", "\n"),
137 if (ap == arguments) {
138 *ap++ = client_getcpy ("localhost");
143 n2 = nets + sizeof(nets) / sizeof(nets[0]);
146 h2 = hosts + sizeof(hosts) / sizeof(hosts[0]);
148 for (ap = arguments; *ap; ap++) {
151 * the assumption here is that if the system doesn't have a
152 * gethostbyname() function, it must not use DNS. So we need to look
153 * into the /etc/hosts using gethostent(). There probablly aren't any
154 * systems still like this, but you never know. On every system I have
155 * access to, this section is ignored.
157 #ifndef HAVE_GETHOSTBYNAME
158 if ((np = getnetbyname (*ap + 1))) {
159 #ifdef HAVE_SETHOSTENT
161 #endif /* HAVE_SETHOSTENT */
162 while ((hp = gethostent()))
163 if (np->n_addrtype == hp->h_addrtype
164 && inet (hp, np->n_net)) {
165 switch (sd = rcaux (sp, hp, rproto, response, len_response)) {
179 #endif /* don't HAVE_GETHOSTBYNAME */
183 if ((hp = gethostbystring (*ap))) {
184 switch (sd = rcaux (sp, hp, rproto, response, len_response)) {
198 strncpy (response, "no servers available", len_response);
204 rcaux (struct servent *sp, struct hostent *hp, int rproto,
205 char *response, int len_response)
209 register struct addrent *ap;
210 struct sockaddr_in in_socket;
211 register struct sockaddr_in *isock = &in_socket;
218 for (ap = nets; ap < n1; ap++)
219 if (ap->a_addrtype == hp->h_addrtype && inet (hp, ap->a_net))
222 for (ap = hosts; ap < h1; ap++)
223 if (ap->a_addrtype == hp->h_addrtype
224 && memcmp(ap->a_addr, hp->h_addr, hp->h_length) == 0)
227 if ((sd = getport (rproto, hp->h_addrtype, response, len_response)) == NOTOK)
230 memset (isock, 0, sizeof(*isock));
231 isock->sin_family = hp->h_addrtype;
232 inaddr_copy (hp, isock);
233 isock->sin_port = sp->s_port;
235 if (connect (sd, (struct sockaddr *) isock, sizeof(*isock)) == NOTOK)
241 n1->a_addrtype = hp->h_addrtype;
242 memcpy(&in, hp->h_addr, sizeof(in));
243 n1->a_net = inet_netof (in);
253 h1->a_addrtype = hp->h_addrtype;
254 memcpy(h1->a_addr, hp->h_addr, hp->h_length);
261 if (kservice) { /* "pop" */
264 if (( hp2 = gethostbyaddr( hp->h_addr, hp->h_length, hp->h_addrtype ))
268 if ((instance = strdup (hp2->h_name)) == NULL) {
270 strncpy (response, "Out of memory.", len_response);
273 ticket = (KTEXT) malloc (sizeof(KTEXT_ST));
274 rem = krb_sendauth (0L, sd, ticket, kservice, instance,
275 (char *) krb_realmofhost (instance),
276 (unsigned long) 0, &msg_data, &cred, schedule,
277 (struct sockaddr_in *) NULL,
278 (struct sockaddr_in *) NULL,
281 if (rem != KSUCCESS) {
283 strncpy (response, "Post office refused connection: ", len_response);
284 strncat (response, krb_err_txt[rem], len_response - strlen(response));
295 getport (int rproto, int addrtype, char *response, int len_response)
298 struct sockaddr_in in_socket, *isock;
301 if (rproto && addrtype != AF_INET) {
302 snprintf (response, len_response, "reserved ports not supported for af=%d", addrtype);
307 if ((sd = socket (AF_INET, SOCK_STREAM, 0)) == NOTOK) {
310 if ((s = strerror (errno)))
311 snprintf (response, len_response, "unable to create socket: %s", s);
313 snprintf (response, len_response, "unable to create socket: unknown error");
317 if (kservice) /* "pop" */
323 memset(isock, 0, sizeof(*isock));
324 isock->sin_family = addrtype;
325 for (port = IPPORT_RESERVED - 1;;) {
326 isock->sin_port = htons ((unsigned short) port);
327 if (bind (sd, (struct sockaddr *) isock, sizeof(*isock)) != NOTOK)
335 if (--port <= IPPORT_RESERVED / 2) {
336 strncpy (response, "ports available", len_response);
342 if ((s = strerror (errno)))
343 snprintf (response, len_response, "unable to bind socket: %s", s);
345 snprintf (response, len_response, "unable to bind socket: unknown error");
353 inet (struct hostent *hp, int net)
357 memcpy(&in, hp->h_addr, sizeof(in));
358 return (inet_netof (in) == net);
363 * taken from ISODE's compat/internet.c
366 static char *empty = NULL;
369 static char *addrs[2] = { NULL };
373 gethostbystring (char *s)
375 register struct hostent *h;
376 static struct hostent hs;
378 static struct in_addr iaddr;
380 static unsigned long iaddr;
383 iaddr = inet_addr (s);
385 if (iaddr.s_addr == NOTOK && strcmp (s, "255.255.255.255"))
387 if (((int) iaddr == NOTOK) && strcmp (s, "255.255.255.255"))
389 return gethostbyname (s);
393 h->h_aliases = ∅
394 h->h_addrtype = AF_INET;
395 h->h_length = sizeof(iaddr);
397 h->h_addr_list = addrs;
398 memset(addrs, 0, sizeof(addrs));
400 h->h_addr = (char *) &iaddr;
407 * static copies of three nmh subroutines
410 static char *broken[MAXARGS + 1];
413 client_brkstring (char *strg, char *brksep, char *brkterm)
416 register char c, *sp;
420 for (bi = 0; bi < MAXARGS; bi++) {
421 while (client_brkany (c = *sp, brksep))
423 if (!c || client_brkany (c, brkterm)) {
430 while ((c = *++sp) && !client_brkany (c, brksep) && !client_brkany (c, brkterm))
440 * returns 1 if chr in strg, 0 otherwise
443 client_brkany (char chr, char *strg)
448 for (sp = strg; *sp; sp++)
456 * copy a string array and return pointer to end
459 client_copyip (char **p, char **q, int len_q)
461 while (*p && --len_q > 0)
471 client_getcpy (char *str)
476 len = strlen(str) + 1;
477 if (!(cp = malloc(len)))
480 memcpy (cp, str, len);