--- /dev/null
+
+/*
+ * client.c -- connect to a server
+ *
+ * $Id$
+ */
+
+#include <h/mh.h>
+#include <h/mts.h>
+#include <errno.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netdb.h>
+
+#ifdef HAVE_ARPA_INET_H
+# include <arpa/inet.h>
+#endif
+
+#ifdef HESIOD
+# include <hesiod.h>
+#endif
+
+#ifdef KPOP
+# include <krb.h>
+# include <ctype.h>
+#endif /* KPOP */
+
+#define TRUE 1
+#define FALSE 0
+
+#define OOPS1 (-2)
+#define OOPS2 (-3)
+
+#define MAXARGS 1000
+#define MAXNETS 5
+#define MAXHOSTS 25
+
+struct addrent {
+ int a_addrtype; /* assumes AF_INET for inet_netof () */
+ union {
+ int un_net;
+ char un_addr[14];
+ } un;
+};
+
+#define a_net un.un_net
+#define a_addr un.un_addr
+
+static struct addrent *n1, *n2;
+static struct addrent nets[MAXNETS];
+static struct addrent *h1, *h2;
+static struct addrent hosts[MAXHOSTS];
+
+#ifdef KPOP
+static CREDENTIALS cred;
+static MSG_DAT msg_data;
+static KTEXT ticket = (KTEXT) NULL;
+static Key_schedule schedule;
+static char *kservice; /* "pop" if using kpop */
+char krb_realm[REALM_SZ];
+char *PrincipalHostname();
+#endif /* KPOP */
+
+#if !defined(h_addr)
+# define h_addr h_addr_list[0]
+#endif
+
+#define inaddr_copy(hp,sin) \
+ memcpy(&((sin)->sin_addr), (hp)->h_addr, (hp)->h_length)
+
+/*
+ * static prototypes
+ */
+static int rcaux (struct servent *, struct hostent *, int, char *, int);
+static int getport (int, int, char *, int);
+static int inet (struct hostent *, int);
+struct hostent *gethostbystring (char *s);
+
+/* client's own static version of several nmh subroutines */
+static char **client_brkstring (char *, char *, char *);
+static int client_brkany (char, char *);
+static char **client_copyip (char **, char **, int);
+static char *client_getcpy (char *);
+
+
+int
+client (char *args, char *protocol, char *service, int rproto,
+ char *response, int len_response)
+{
+ int sd;
+ register char **ap;
+ char *arguments[MAXARGS];
+ register struct hostent *hp;
+ register struct servent *sp;
+#ifndef HAVE_GETHOSTBYNAME
+ register struct netent *np;
+#endif
+
+#ifdef KPOP
+ char *cp;
+
+ kservice = service;
+ if (cp = strchr (service, '/')) { /* "pop/kpop" */
+ *cp++ = '\0'; /* kservice = "pop" */
+ service = cp; /* service = "kpop" */
+ } else {
+ kservice = NULL; /* not using KERBEROS */
+ }
+#endif /* KPOP */
+
+
+ if ((sp = getservbyname (service, protocol)) == NULL) {
+#ifdef HESIOD
+ if ((sp = hes_getservbyname (service, protocol)) == NULL) {
+ snprintf (response, len_response, "%s/%s: unknown service", protocol, service);
+ return NOTOK;
+ }
+#else
+ snprintf (response, len_response, "%s/%s: unknown service", protocol, service);
+ return NOTOK;
+#endif
+ }
+
+ ap = arguments;
+ if (args != NULL && *args != 0) {
+ ap = client_copyip (client_brkstring (client_getcpy (args), " ", "\n"),
+ ap, MAXARGS);
+ } else {
+ if (servers != NULL && *servers != 0)
+ ap = client_copyip (client_brkstring (client_getcpy (servers), " ", "\n"),
+ ap, MAXARGS);
+ }
+ if (ap == arguments) {
+ *ap++ = client_getcpy ("localhost");
+ *ap = NULL;
+ }
+
+ n1 = nets;
+ n2 = nets + sizeof(nets) / sizeof(nets[0]);
+
+ h1 = hosts;
+ h2 = hosts + sizeof(hosts) / sizeof(hosts[0]);
+
+ for (ap = arguments; *ap; ap++) {
+ if (**ap == '\01') {
+/*
+ * the assumption here is that if the system doesn't have a
+ * gethostbyname() function, it must not use DNS. So we need to look
+ * into the /etc/hosts using gethostent(). There probablly aren't any
+ * systems still like this, but you never know. On every system I have
+ * access to, this section is ignored.
+ */
+#ifndef HAVE_GETHOSTBYNAME
+ if ((np = getnetbyname (*ap + 1))) {
+#ifdef HAVE_SETHOSTENT
+ sethostent (1);
+#endif /* HAVE_SETHOSTENT */
+ while ((hp = gethostent()))
+ if (np->n_addrtype == hp->h_addrtype
+ && inet (hp, np->n_net)) {
+ switch (sd = rcaux (sp, hp, rproto, response, len_response)) {
+ case NOTOK:
+ continue;
+ case OOPS1:
+ break;
+ case OOPS2:
+ return NOTOK;
+
+ default:
+ return sd;
+ }
+ break;
+ }
+ }
+#endif /* don't HAVE_GETHOSTBYNAME */
+ continue;
+ }
+
+ if ((hp = gethostbystring (*ap))) {
+ switch (sd = rcaux (sp, hp, rproto, response, len_response)) {
+ case NOTOK:
+ case OOPS1:
+ break;
+ case OOPS2:
+ return NOTOK;
+
+ default:
+ return sd;
+ }
+ continue;
+ }
+ }
+
+ strncpy (response, "no servers available", len_response);
+ return NOTOK;
+}
+
+
+static int
+rcaux (struct servent *sp, struct hostent *hp, int rproto,
+ char *response, int len_response)
+{
+ int sd;
+ struct in_addr in;
+ register struct addrent *ap;
+ struct sockaddr_in in_socket;
+ register struct sockaddr_in *isock = &in_socket;
+
+#ifdef KPOP
+ int rem;
+ struct hostent *hp2;
+#endif /* KPOP */
+
+ for (ap = nets; ap < n1; ap++)
+ if (ap->a_addrtype == hp->h_addrtype && inet (hp, ap->a_net))
+ return NOTOK;
+
+ for (ap = hosts; ap < h1; ap++)
+ if (ap->a_addrtype == hp->h_addrtype
+ && memcmp(ap->a_addr, hp->h_addr, hp->h_length) == 0)
+ return NOTOK;
+
+ if ((sd = getport (rproto, hp->h_addrtype, response, len_response)) == NOTOK)
+ return OOPS2;
+
+ memset (isock, 0, sizeof(*isock));
+ isock->sin_family = hp->h_addrtype;
+ inaddr_copy (hp, isock);
+ isock->sin_port = sp->s_port;
+
+ if (connect (sd, (struct sockaddr *) isock, sizeof(*isock)) == NOTOK)
+ switch (errno) {
+ case ENETDOWN:
+ case ENETUNREACH:
+ close (sd);
+ if (n1 < n2) {
+ n1->a_addrtype = hp->h_addrtype;
+ memcpy(&in, hp->h_addr, sizeof(in));
+ n1->a_net = inet_netof (in);
+ n1++;
+ }
+ return OOPS1;
+
+ case ETIMEDOUT:
+ case ECONNREFUSED:
+ default:
+ close (sd);
+ if (h1 < h2) {
+ h1->a_addrtype = hp->h_addrtype;
+ memcpy(h1->a_addr, hp->h_addr, hp->h_length);
+ h1++;
+ }
+ return NOTOK;
+ }
+
+#ifdef KPOP
+ if (kservice) { /* "pop" */
+ char *instance;
+
+ if (( hp2 = gethostbyaddr( hp->h_addr, hp->h_length, hp->h_addrtype ))
+ == NULL ) {
+ return NOTOK;
+ }
+ if ((instance = strdup (hp2->h_name)) == NULL) {
+ close (sd);
+ strncpy (response, "Out of memory.", len_response);
+ return OOPS2;
+ }
+ ticket = (KTEXT) malloc (sizeof(KTEXT_ST));
+ rem = krb_sendauth (0L, sd, ticket, kservice, instance,
+ (char *) krb_realmofhost (instance),
+ (unsigned long) 0, &msg_data, &cred, schedule,
+ (struct sockaddr_in *) NULL,
+ (struct sockaddr_in *) NULL,
+ "KPOPV0.1");
+ free (instance);
+ if (rem != KSUCCESS) {
+ close (sd);
+ strncpy (response, "Post office refused connection: ", len_response);
+ strncat (response, krb_err_txt[rem], len_response - strlen(response));
+ return OOPS2;
+ }
+ }
+#endif /* KPOP */
+
+ return sd;
+}
+
+
+static int
+getport (int rproto, int addrtype, char *response, int len_response)
+{
+ int sd, port;
+ struct sockaddr_in in_socket, *isock;
+
+ isock = &in_socket;
+ if (rproto && addrtype != AF_INET) {
+ snprintf (response, len_response, "reserved ports not supported for af=%d", addrtype);
+ errno = ENOPROTOOPT;
+ return NOTOK;
+ }
+
+ if ((sd = socket (AF_INET, SOCK_STREAM, 0)) == NOTOK) {
+ char *s;
+
+ if ((s = strerror (errno)))
+ snprintf (response, len_response, "unable to create socket: %s", s);
+ else
+ snprintf (response, len_response, "unable to create socket: unknown error");
+ return NOTOK;
+ }
+#ifdef KPOP
+ if (kservice) /* "pop" */
+ return(sd);
+#endif /* KPOP */
+ if (!rproto)
+ return sd;
+
+ memset(isock, 0, sizeof(*isock));
+ isock->sin_family = addrtype;
+ for (port = IPPORT_RESERVED - 1;;) {
+ isock->sin_port = htons ((unsigned short) port);
+ if (bind (sd, (struct sockaddr *) isock, sizeof(*isock)) != NOTOK)
+ return sd;
+
+ switch (errno) {
+ char *s;
+
+ case EADDRINUSE:
+ case EADDRNOTAVAIL:
+ if (--port <= IPPORT_RESERVED / 2) {
+ strncpy (response, "ports available", len_response);
+ return NOTOK;
+ }
+ break;
+
+ default:
+ if ((s = strerror (errno)))
+ snprintf (response, len_response, "unable to bind socket: %s", s);
+ else
+ snprintf (response, len_response, "unable to bind socket: unknown error");
+ return NOTOK;
+ }
+ }
+}
+
+
+static int
+inet (struct hostent *hp, int net)
+{
+ struct in_addr in;
+
+ memcpy(&in, hp->h_addr, sizeof(in));
+ return (inet_netof (in) == net);
+}
+
+
+/*
+ * taken from ISODE's compat/internet.c
+ */
+
+static char *empty = NULL;
+
+#ifdef h_addr
+static char *addrs[2] = { NULL };
+#endif
+
+struct hostent *
+gethostbystring (char *s)
+{
+ register struct hostent *h;
+ static struct hostent hs;
+#ifdef DG
+ static struct in_addr iaddr;
+#else
+ static unsigned long iaddr;
+#endif
+
+ iaddr = inet_addr (s);
+#ifdef DG
+ if (iaddr.s_addr == NOTOK && strcmp (s, "255.255.255.255"))
+#else
+ if (((int) iaddr == NOTOK) && strcmp (s, "255.255.255.255"))
+#endif
+ return gethostbyname (s);
+
+ h = &hs;
+ h->h_name = s;
+ h->h_aliases = ∅
+ h->h_addrtype = AF_INET;
+ h->h_length = sizeof(iaddr);
+#ifdef h_addr
+ h->h_addr_list = addrs;
+ memset(addrs, 0, sizeof(addrs));
+#endif
+ h->h_addr = (char *) &iaddr;
+
+ return h;
+}
+
+
+/*
+ * static copies of three nmh subroutines
+ */
+
+static char *broken[MAXARGS + 1];
+
+static char **
+client_brkstring (char *strg, char *brksep, char *brkterm)
+{
+ register int bi;
+ register char c, *sp;
+
+ sp = strg;
+
+ for (bi = 0; bi < MAXARGS; bi++) {
+ while (client_brkany (c = *sp, brksep))
+ *sp++ = 0;
+ if (!c || client_brkany (c, brkterm)) {
+ *sp = 0;
+ broken[bi] = 0;
+ return broken;
+ }
+
+ broken[bi] = sp;
+ while ((c = *++sp) && !client_brkany (c, brksep) && !client_brkany (c, brkterm))
+ continue;
+ }
+ broken[MAXARGS] = 0;
+
+ return broken;
+}
+
+
+/*
+ * returns 1 if chr in strg, 0 otherwise
+ */
+static int
+client_brkany (char chr, char *strg)
+{
+ register char *sp;
+
+ if (strg)
+ for (sp = strg; *sp; sp++)
+ if (chr == *sp)
+ return 1;
+ return 0;
+}
+
+
+/*
+ * copy a string array and return pointer to end
+ */
+static char **
+client_copyip (char **p, char **q, int len_q)
+{
+ while (*p && --len_q > 0)
+ *q++ = *p++;
+
+ *q = NULL;
+
+ return q;
+}
+
+
+static char *
+client_getcpy (char *str)
+{
+ char *cp;
+ size_t len;
+
+ len = strlen(str) + 1;
+ if (!(cp = malloc(len)))
+ return NULL;
+
+ memcpy (cp, str, len);
+ return cp;
+}
+
projects / mmh / blobdiff