diff options
Diffstat (limited to 'lib/base/dnsdmain.cpp')
| -rw-r--r-- | lib/base/dnsdmain.cpp | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/lib/base/dnsdmain.cpp b/lib/base/dnsdmain.cpp new file mode 100644 index 00000000..f37e475c --- /dev/null +++ b/lib/base/dnsdmain.cpp @@ -0,0 +1,159 @@ +/** 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 <string.h> +#include <stdio.h> +#ifdef XP_UNIX +#include <unistd.h> +#endif +#include <ctype.h> +#include "util.h" + +/* Under NT, this is taken care of by net.h including winsock.h */ +#ifdef XP_UNIX +#include <netdb.h> /* struct hostent */ +#endif +extern "C" { +#include <nspr.h> +} +#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; +} |