-
-/*
- * hosts.c -- find out the official name of a host
- *
- * This code is Copyright (c) 2002, by the authors of nmh. See the
- * COPYRIGHT file in the root directory of the nmh distribution for
- * complete copyright information.
- */
-
-/*
- * In the SendMail world, we really don't know what the valid
- * hosts are. We could poke around in the sendmail.cf file, but
- * that still isn't a guarantee. As a result, we'll say that
- * everything is a valid host, and let SendMail worry about it.
- */
-
-#include <h/mh.h>
-#include <h/mts.h>
-#include <sys/socket.h>
-#include <netdb.h>
-
-static struct host {
- char *h_name;
- char **h_aliases;
- struct host *h_next;
-} hosts;
-
-
-/*
- * static prototypes
- */
-static int init_hs(void);
-
-
-char *
-OfficialName (char *name)
-{
- unsigned char *p;
- char *q, site[BUFSIZ];
- struct addrinfo hints, *res;
-
- static char buffer[BUFSIZ];
- char **r;
- struct host *h;
-
- for (p = name, q = site; *p && (q - site < (int)sizeof(site) - 1); p++, q++)
- *q = isupper (*p) ? tolower (*p) : *p;
- *q = '\0';
- q = site;
-
- if (!mh_strcasecmp (LocalName(1), site))
- return LocalName(1);
-
- memset(&hints, 0, sizeof(hints));
- hints.ai_flags = AI_CANONNAME;
- hints.ai_family = PF_UNSPEC;
-
- if (getaddrinfo(q, NULL, &hints, &res) == 0) {
- strncpy (buffer, res->ai_canonname, sizeof(buffer));
- buffer[sizeof(buffer) - 1] = '\0';
- freeaddrinfo(res);
- return buffer;
- }
- if (hosts.h_name || init_hs ()) {
- for (h = hosts.h_next; h; h = h->h_next)
- if (!mh_strcasecmp (h->h_name, q)) {
- return h->h_name;
- } else {
- for (r = h->h_aliases; *r; r++)
- if (!mh_strcasecmp (*r, q))
- return h->h_name;
- }
- }
-
- strncpy (buffer, site, sizeof(buffer));
- return buffer;
-}
-
-/*
- * Use hostable as an exception file for those hosts that aren't
- * on the Internet (listed in /etc/hosts). These are usually
- * PhoneNet and UUCP sites.
- */
-
-#define NALIASES 50
-
-static int
-init_hs (void)
-{
- unsigned char *cp;
- char *dp, **q, **r;
- char buffer[BUFSIZ], *aliases[NALIASES];
- register struct host *h;
- register FILE *fp;
-
- if ((fp = fopen (hostable, "r")) == NULL)
- return 0;
-
- h = &hosts;
- while (fgets (buffer, sizeof(buffer), fp) != NULL) {
- if ((cp = strchr(buffer, '#')))
- *cp = 0;
- if ((cp = strchr(buffer, '\n')))
- *cp = 0;
- for (cp = buffer; *cp; cp++)
- if (isspace (*cp))
- *cp = ' ';
- for (cp = buffer; isspace (*cp); cp++)
- continue;
- if (*cp == 0)
- continue;
-
- q = aliases;
- if ((cp = strchr(dp = cp, ' '))) {
- *cp = 0;
- for (cp++; *cp; cp++) {
- while (isspace (*cp))
- cp++;
- if (*cp == 0)
- break;
- if ((cp = strchr(*q++ = cp, ' ')))
- *cp = 0;
- else
- break;
- if (q >= aliases + NALIASES)
- break;
- }
- }
-
- *q = 0;
-
- h->h_next = (struct host *) calloc (1, sizeof(*h));
- h = h->h_next;
- h->h_name = getcpy (dp);
- r = h->h_aliases =
- (char **) calloc ((size_t) (q - aliases + 1), sizeof(*q));
- for (q = aliases; *q; q++)
- *r++ = getcpy (*q);
- *r = 0;
- }
-
- fclose (fp);
- return 1;
-}
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