/* Unix SMB/CIFS implementation. Samba system utilities Copyright (C) Andrew Tridgell 1992-1998 Copyright (C) Jeremy Allison 1998-2002 This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include "includes.h" #include "system/network.h" #include "system/filesys.h" /* The idea is that this file will eventually have wrappers around all important system calls in samba. The aims are: - to enable easier porting by putting OS dependent stuff in here - to allow for hooks into other "pseudo-filesystems" - to allow easier integration of things like the japanese extensions - to support the philosophy of Samba to expose the features of the OS within the SMB model. In general whatever file/printer/variable expansions/etc make sense to the OS should be acceptable to Samba. */ /************************************************************************** A wrapper for gethostbyname() that tries avoids looking up hostnames in the root domain, which can cause dial-on-demand links to come up for no apparent reason. ****************************************************************************/ _PUBLIC_ struct hostent *sys_gethostbyname(const char *name) { #ifdef REDUCE_ROOT_DNS_LOOKUPS char query[256], hostname[256]; char *domain; /* Does this name have any dots in it? If so, make no change */ if (strchr(name, '.')) return(gethostbyname(name)); /* Get my hostname, which should have domain name attached. If not, just do the gethostname on the original string. */ gethostname(hostname, sizeof(hostname) - 1); hostname[sizeof(hostname) - 1] = 0; if ((domain = strchr(hostname, '.')) == NULL) return(gethostbyname(name)); /* Attach domain name to query and do modified query. If names too large, just do gethostname on the original string. */ if((strlen(name) + strlen(domain)) >= sizeof(query)) return(gethostbyname(name)); slprintf(query, sizeof(query)-1, "%s%s", name, domain); return(gethostbyname(query)); #else /* REDUCE_ROOT_DNS_LOOKUPS */ return(gethostbyname(name)); #endif /* REDUCE_ROOT_DNS_LOOKUPS */ } _PUBLIC_ struct in_addr sys_inet_makeaddr(int net, int host) { struct in_addr in; struct in_addr in2; in = inet_makeaddr(net, host); in2.s_addr = in.s_addr; return in2; } /************************************************************************** Wrapper for fork. Ensures we clear our pid cache. ****************************************************************************/ static pid_t mypid = (pid_t)-1; _PUBLIC_ pid_t sys_fork(void) { pid_t forkret = fork(); if (forkret == (pid_t)0) { /* Child - reset mypid so sys_getpid does a system call. */ mypid = (pid_t) -1; } return forkret; } /************************************************************************** Wrapper for getpid. Ensures we only do a system call *once*. ****************************************************************************/ _PUBLIC_ pid_t sys_getpid(void) { if (mypid == (pid_t)-1) mypid = getpid(); return mypid; }