/* Unix SMB/CIFS implementation. Samba utility functions Copyright (C) Andrew Tridgell 1992-1998 Copyright (C) Jeremy Allison 2001-2002 Copyright (C) Simo Sorce 2001 Copyright (C) Jim McDonough (jmcd@us.ibm.com) 2003. Copyright (C) James J Myers 2003 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 2 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, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "includes.h" #include "dynconfig.h" #include "system/network.h" #include "system/iconv.h" #include "system/dir.h" #include "system/filesys.h" /*************************************************************************** Find a suitable temporary directory. The result should be copied immediately as it may be overwritten by a subsequent call. ****************************************************************************/ const char *tmpdir(void) { char *p; if ((p = getenv("TMPDIR"))) return p; return "/tmp"; } /******************************************************************* Check if a file exists - call vfs_file_exist for samba files. ********************************************************************/ BOOL file_exist(const char *fname) { struct stat st; if (stat(fname, &st) != 0) { return False; } return ((S_ISREG(st.st_mode)) || (S_ISFIFO(st.st_mode))); } /******************************************************************* Check a files mod time. ********************************************************************/ time_t file_modtime(const char *fname) { struct stat st; if (stat(fname,&st) != 0) return(0); return(st.st_mtime); } /******************************************************************* Check if a directory exists. ********************************************************************/ BOOL directory_exist(const char *dname) { struct stat st; BOOL ret; if (stat(dname,&st) != 0) { return False; } ret = S_ISDIR(st.st_mode); if(!ret) errno = ENOTDIR; return ret; } /******************************************************************* Returns the size in bytes of the named file. ********************************************************************/ off_t get_file_size(char *file_name) { struct stat buf; buf.st_size = 0; if(stat(file_name,&buf) != 0) return (off_t)-1; return(buf.st_size); } /******************************************************************* Close the low 3 fd's and open dev/null in their place. ********************************************************************/ void close_low_fds(BOOL stderr_too) { #ifndef VALGRIND int fd; int i; close(0); close(1); if (stderr_too) close(2); /* try and use up these file descriptors, so silly library routines writing to stdout etc won't cause havoc */ for (i=0;i<3;i++) { if (i == 2 && !stderr_too) continue; fd = open("/dev/null",O_RDWR,0); if (fd < 0) fd = open("/dev/null",O_WRONLY,0); if (fd < 0) { DEBUG(0,("Can't open /dev/null\n")); return; } if (fd != i) { DEBUG(0,("Didn't get file descriptor %d\n",i)); return; } } #endif } /**************************************************************************** Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available, else if SYSV use O_NDELAY if BSD use FNDELAY ****************************************************************************/ int set_blocking(int fd, BOOL set) { int val; #ifdef O_NONBLOCK #define FLAG_TO_SET O_NONBLOCK #else #ifdef SYSV #define FLAG_TO_SET O_NDELAY #else /* BSD */ #define FLAG_TO_SET FNDELAY #endif #endif if((val = fcntl(fd, F_GETFL, 0)) == -1) return -1; if(set) /* Turn blocking on - ie. clear nonblock flag */ val &= ~FLAG_TO_SET; else val |= FLAG_TO_SET; return fcntl( fd, F_SETFL, val); #undef FLAG_TO_SET } /******************************************************************* Sleep for a specified number of milliseconds. ********************************************************************/ void msleep(uint_t t) { struct timeval tval; tval.tv_sec = t/1000; tval.tv_usec = 1000*(t%1000); /* this should be the real select - do NOT replace with sys_select() */ select(0,NULL,NULL,NULL,&tval); } /**************************************************************************** Become a daemon, discarding the controlling terminal. ****************************************************************************/ void become_daemon(BOOL Fork) { if (Fork) { if (fork()) { _exit(0); } } /* detach from the terminal */ #ifdef HAVE_SETSID setsid(); #elif defined(TIOCNOTTY) { int i = open("/dev/tty", O_RDWR, 0); if (i != -1) { ioctl(i, (int) TIOCNOTTY, (char *)0); close(i); } } #endif /* HAVE_SETSID */ /* Close fd's 0,1,2. Needed if started by rsh */ close_low_fds(False); /* Don't close stderr, let the debug system attach it to the logfile */ } /**************************************************************************** Free memory, checks for NULL. Use directly SAFE_FREE() Exists only because we need to pass a function pointer somewhere --SSS ****************************************************************************/ void safe_free(void *p) { SAFE_FREE(p); } /* see if a string matches either our primary or one of our secondary netbios aliases. do a case insensitive match */ BOOL is_myname(const char *name) { const char **aliases; int i; if (strcasecmp(name, lp_netbios_name()) == 0) { return True; } aliases = lp_netbios_aliases(); for (i=0; aliases && aliases[i]; i++) { if (strcasecmp(name, aliases[i]) == 0) { return True; } } return False; } /**************************************************************************** Get my own name, return in malloc'ed storage. ****************************************************************************/ char* get_myname(void) { char *hostname; const int host_name_max = 255; char *p; hostname = malloc(host_name_max+1); *hostname = 0; /* get my host name */ if (gethostname(hostname, host_name_max+1) == -1) { DEBUG(0,("gethostname failed\n")); return NULL; } /* Ensure null termination. */ hostname[host_name_max] = '\0'; /* split off any parts after an initial . */ p = strchr_m(hostname,'.'); if (p) *p = 0; return hostname; } /**************************************************************************** Interpret a protocol description string, with a default. ****************************************************************************/ int interpret_protocol(char *str,int def) { if (strequal(str,"NT1")) return(PROTOCOL_NT1); if (strequal(str,"LANMAN2")) return(PROTOCOL_LANMAN2); if (strequal(str,"LANMAN1")) return(PROTOCOL_LANMAN1); if (strequal(str,"CORE")) return(PROTOCOL_CORE); if (strequal(str,"COREPLUS")) return(PROTOCOL_COREPLUS); if (strequal(str,"CORE+")) return(PROTOCOL_COREPLUS); DEBUG(0,("Unrecognised protocol level %s\n",str)); return(def); } /**************************************************************************** Return true if a string could be a pure IP address. ****************************************************************************/ BOOL is_ipaddress(const char *str) { BOOL pure_address = True; int i; for (i=0; pure_address && str[i]; i++) if (!(isdigit((int)str[i]) || str[i] == '.')) pure_address = False; /* Check that a pure number is not misinterpreted as an IP */ pure_address = pure_address && (strchr_m(str, '.') != NULL); return pure_address; } /**************************************************************************** Interpret an internet address or name into an IP address in 4 byte form. ****************************************************************************/ uint32_t interpret_addr(const char *str) { struct hostent *hp; uint32_t res; if (str == NULL || *str == 0 || strcmp(str,"0.0.0.0") == 0) { return 0; } if (strcmp(str,"255.255.255.255") == 0) { return 0xFFFFFFFF; } /* recognise 'localhost' as a special name. This fixes problems with some hosts that don't have localhost in /etc/hosts */ if (strcasecmp(str,"localhost") == 0) { str = "127.0.0.1"; } /* if it's in the form of an IP address then get the lib to interpret it */ if (is_ipaddress(str)) { res = sys_inet_addr(str); } else { /* otherwise assume it's a network name of some sort and use sys_gethostbyname */ if ((hp = sys_gethostbyname(str)) == 0) { DEBUG(3,("sys_gethostbyname: Unknown host. %s\n",str)); return 0; } if(hp->h_addr == NULL) { DEBUG(3,("sys_gethostbyname: host address is invalid for host %s\n",str)); return 0; } memcpy((char *)&res,(char *)hp->h_addr, 4); } if (res == (uint32_t)-1) return(0); return(res); } /******************************************************************* A convenient addition to interpret_addr(). ******************************************************************/ struct ipv4_addr interpret_addr2(const char *str) { struct ipv4_addr ret; uint32_t a = interpret_addr(str); ret.addr = a; return ret; } /******************************************************************* Check if an IP is the 0.0.0.0. ******************************************************************/ BOOL is_zero_ip(struct ipv4_addr ip) { return ip.addr == 0; } /******************************************************************* Set an IP to 0.0.0.0. ******************************************************************/ void zero_ip(struct ipv4_addr *ip) { *ip = sys_inet_makeaddr(0,0); return; } /******************************************************************* Are two IPs on the same subnet? ********************************************************************/ BOOL same_net(struct ipv4_addr ip1,struct ipv4_addr ip2,struct ipv4_addr mask) { uint32_t net1,net2,nmask; nmask = ntohl(mask.addr); net1 = ntohl(ip1.addr); net2 = ntohl(ip2.addr); return((net1 & nmask) == (net2 & nmask)); } /**************************************************************************** Check if a process exists. Does this work on all unixes? ****************************************************************************/ BOOL process_exists(pid_t pid) { /* Doing kill with a non-positive pid causes messages to be * sent to places we don't want. */ SMB_ASSERT(pid > 0); return(kill(pid,0) == 0 || errno != ESRCH); } /**************************************************************************** Simple routine to do POSIX file locking. Cruft in NFS and 64->32 bit mapping is dealt with in posix.c ****************************************************************************/ BOOL fcntl_lock(int fd, int op, off_t offset, off_t count, int type) { struct flock lock; int ret; DEBUG(8,("fcntl_lock %d %d %.0f %.0f %d\n",fd,op,(double)offset,(double)count,type)); lock.l_type = type; lock.l_whence = SEEK_SET; lock.l_start = offset; lock.l_len = count; lock.l_pid = 0; ret = fcntl(fd,op,&lock); if (ret == -1 && errno != 0) DEBUG(3,("fcntl_lock: fcntl lock gave errno %d (%s)\n",errno,strerror(errno))); /* a lock query */ if (op == F_GETLK) { if ((ret != -1) && (lock.l_type != F_UNLCK) && (lock.l_pid != 0) && (lock.l_pid != getpid())) { DEBUG(3,("fcntl_lock: fd %d is locked by pid %d\n",fd,(int)lock.l_pid)); return(True); } /* it must be not locked or locked by me */ return(False); } /* a lock set or unset */ if (ret == -1) { DEBUG(3,("fcntl_lock: lock failed at offset %.0f count %.0f op %d type %d (%s)\n", (double)offset,(double)count,op,type,strerror(errno))); return(False); } /* everything went OK */ DEBUG(8,("fcntl_lock: Lock call successful\n")); return(True); } static void print_asc(int level, const uint8_t *buf,int len) { int i; for (i=0;i<len;i++) DEBUGADD(level,("%c", isprint(buf[i])?buf[i]:'.')); } void dump_data(int level, const uint8_t *buf,int len) { int i=0; if (len<=0) return; if (!DEBUGLVL(level)) return; DEBUGADD(level,("[%03X] ",i)); for (i=0;i<len;) { DEBUGADD(level,("%02X ",(int)buf[i])); i++; if (i%8 == 0) DEBUGADD(level,(" ")); if (i%16 == 0) { print_asc(level,&buf[i-16],8); DEBUGADD(level,(" ")); print_asc(level,&buf[i-8],8); DEBUGADD(level,("\n")); if (i<len) DEBUGADD(level,("[%03X] ",i)); } } if (i%16) { int n; n = 16 - (i%16); DEBUGADD(level,(" ")); if (n>8) DEBUGADD(level,(" ")); while (n--) DEBUGADD(level,(" ")); n = MIN(8,i%16); print_asc(level,&buf[i-(i%16)],n); DEBUGADD(level,( " " )); n = (i%16) - n; if (n>0) print_asc(level,&buf[i-n],n); DEBUGADD(level,("\n")); } } /***************************************************************** Possibly replace mkstemp if it is broken. *****************************************************************/ int smb_mkstemp(char *template) { #if HAVE_SECURE_MKSTEMP return mkstemp(template); #else /* have a reasonable go at emulating it. Hope that the system mktemp() isn't completly hopeless */ char *p = mktemp(template); if (!p) return -1; return open(p, O_CREAT|O_EXCL|O_RDWR, 0600); #endif } /***************************************************************** malloc that aborts with smb_panic on fail or zero size. *****************************************************************/ void *smb_xmalloc(size_t size) { void *p; if (size == 0) smb_panic("smb_xmalloc: called with zero size.\n"); if ((p = malloc(size)) == NULL) smb_panic("smb_xmalloc: malloc fail.\n"); return p; } /** Memdup with smb_panic on fail. **/ void *smb_xmemdup(const void *p, size_t size) { void *p2; p2 = smb_xmalloc(size); memcpy(p2, p, size); return p2; } /** strdup that aborts on malloc fail. **/ char *smb_xstrdup(const char *s) { char *s1 = strdup(s); if (!s1) smb_panic("smb_xstrdup: malloc fail\n"); return s1; } /***************************************************************** Like strdup but for memory. *****************************************************************/ void *memdup(const void *p, size_t size) { void *p2; if (size == 0) return NULL; p2 = malloc(size); if (!p2) return NULL; memcpy(p2, p, size); return p2; } /***************************************************************** Get local hostname and cache result. *****************************************************************/ char *myhostname(TALLOC_CTX *mem_ctx) { char *myname, *ret; myname = get_myname(); ret = talloc_strdup(mem_ctx, myname); free(myname); return ret; } /********************************************************************** Converts a name to a fully qalified domain name. ***********************************************************************/ char *name_to_fqdn(TALLOC_CTX *mem_ctx, const char *name) { struct hostent *hp = sys_gethostbyname(name); if ( hp && hp->h_name && *hp->h_name ) { DEBUG(10,("name_to_fqdn: lookup for %s -> %s.\n", name, hp->h_name)); return talloc_strdup(mem_ctx, hp->h_name); } else { DEBUG(10,("name_to_fqdn: lookup for %s failed.\n", name)); return talloc_strdup(mem_ctx, name); } } /***************************************************************** A useful function for returning a path in the Samba lock directory. *****************************************************************/ char *lock_path(TALLOC_CTX* mem_ctx, const char *name) { char *fname, *dname; dname = talloc_strdup(mem_ctx, lp_lockdir()); trim_string(dname,"","/"); if (!directory_exist(dname)) { mkdir(dname,0755); } fname = talloc_asprintf(mem_ctx, "%s/%s", dname, name); talloc_free(dname); return fname; } /** * @brief Returns an absolute path to a file in the Samba lib directory. * * @param name File to find, relative to LIBDIR. * * @retval Pointer to a talloc'ed string containing the full path. **/ char *lib_path(TALLOC_CTX* mem_ctx, const char *name) { char *fname; fname = talloc_asprintf(mem_ctx, "%s/%s", dyn_LIBDIR, name); return fname; } /** * @brief Returns an absolute path to a file in the Samba private directory. * * @param name File to find, relative to PRIVATEDIR. * if name is not relative, then use it as-is * * @retval Pointer to a talloc'ed string containing the full path. **/ char *private_path(TALLOC_CTX* mem_ctx, const char *name) { char *fname; if (name == NULL) { return NULL; } if (name[0] == 0 || name[0] == '/' || strstr(name, ":/")) { return talloc_strdup(mem_ctx, name); } fname = talloc_asprintf(mem_ctx, "%s/%s", lp_private_dir(), name); return fname; } /* return a path in the smbd.tmp directory, where all temporary file for smbd go. If NULL is passed for name then return the directory path itself */ char *smbd_tmp_path(TALLOC_CTX *mem_ctx, const char *name) { char *fname, *dname; dname = lock_path(mem_ctx, "smbd.tmp"); if (!directory_exist(dname)) { mkdir(dname,0755); } if (name == NULL) { return dname; } fname = talloc_asprintf(mem_ctx, "%s/%s", dname, name); talloc_free(dname); return fname; } void dump_data_pw(const char *msg, const uint8_t * data, size_t len) { #ifdef DEBUG_PASSWORD DEBUG(11, ("%s", msg)); if (data != NULL && len > 0) { dump_data(11, data, len); } #endif } /* see if a range of memory is all zero. A NULL pointer is considered to be all zero */ BOOL all_zero(const uint8_t *ptr, uint_t size) { int i; if (!ptr) return True; for (i=0;i<size;i++) { if (ptr[i]) return False; } return True; } /* realloc an array, checking for integer overflow in the array size */ void *realloc_array(void *ptr, size_t el_size, unsigned count) { #define MAX_MALLOC_SIZE 0x7fffffff if (count == 0 || count >= MAX_MALLOC_SIZE/el_size) { return NULL; } if (!ptr) { return malloc(el_size * count); } return realloc(ptr, el_size * count); }