/** BEGIN COPYRIGHT BLOCK * Copyright 2001 Sun Microsystems, Inc. * Portions copyright 1999, 2001-2003 Netscape Communications Corporation. * All rights reserved. * END COPYRIGHT BLOCK **/ /* * dnsdmain.c: DNS domain guessing stuff moved out of dns.c because of the * string ball problems */ #include "netsite.h" #include "base/net.h" #include #include #ifdef XP_UNIX #include #endif #include #include "util.h" /* Under NT, this is taken care of by net.h including winsock.h */ #ifdef XP_UNIX #include /* struct hostent */ #endif extern "C" { #include } #include "frame/conf.h" /* This is contained in resolv.h on most systems. */ #define _PATH_RESCONF "/etc/resolv.conf" #ifdef XP_UNIX NSPR_BEGIN_EXTERN_C #ifdef Linux extern int getdomainname(char *, size_t); #else extern int getdomainname(char *, int); #endif /* Linux */ #if defined(HPUX) || defined (UnixWare) || defined(Linux) || defined(IRIX6_5) extern int gethostname (char *name, size_t namelen); #else #ifndef AIX extern int gethostname (char *name, int namelen); #endif #endif NSPR_END_EXTERN_C #endif /* ---------------------------- dns_guess_domain -------------------------- */ extern "C" NSAPI_PUBLIC char *dns_guess_domain(char * hname) { FILE *f; char * cp; int hnlen; char line[256]; static int dnlen = 0; static char * domain = 0; PRHostEnt hent; char buf[PR_NETDB_BUF_SIZE]; PRStatus err; /* Sanity check */ if (strchr(hname, '.')) { return STRDUP(hname); } if (dnlen == 0) { /* First try a little trick that seems to often work... */ /* * Get the local host name, even it doesn't come back * fully qualified. */ line[0] = 0; gethostname(line, sizeof(line)); if (line[0] != 0) { /* Is it fully qualified? */ domain = strchr(line, '.'); if (domain == 0) { /* No, try gethostbyname() */ err = PR_GetHostByName(line, buf, PR_NETDB_BUF_SIZE, &hent); if (err == PR_SUCCESS) { /* See if h_name is fully-qualified */ if (hent.h_name) domain = strchr(hent.h_name, '.'); /* Otherwise look for a fully qualified alias */ if ((domain == 0) && (hent.h_aliases && hent.h_aliases[0])) { char **p; for (p = hent.h_aliases; *p; ++p) { domain = strchr(*p, '.'); if (domain) break; } } } } } /* Still no luck? */ if (domain == 0) { f = fopen(_PATH_RESCONF, "r"); /* See if there's a domain entry in their resolver configuration */ if(f) { while(fgets(line, sizeof(line), f)) { if(!strncasecmp(line, "domain ", 7)) { for (cp = &line[7]; *cp && isspace(*cp); ++cp) ; if (*cp) { domain = cp; for (; *cp && !isspace(*cp); ++cp) ; *cp = 0; } break; } } fclose(f); } } #ifndef NO_DOMAINNAME if (domain == 0) { /* No domain found. Try getdomainname. */ getdomainname(line, sizeof(line)); if (line[0] != 0) domain = &line[0]; } #endif if (domain != 0) { if (domain[0] == '.') ++domain; domain = STRDUP(domain); dnlen = strlen(domain); } else dnlen = -1; } if (domain != 0) { hnlen = strlen(hname); if ((hnlen + dnlen + 2) <= sizeof(line)) { strcpy(line, hname); line[hnlen] = '.'; strcpy(&line[hnlen+1], domain); return STRDUP(line); } } return 0; }