/*
Unix SMB/CIFS implementation.
Samba utility functions
Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Tim Potter 2000-2001
Copyright (C) Jeremy Allison 1992-2007
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 .
*/
#include "includes.h"
/* the following 3 client_*() functions are nasty ways of allowing
some generic functions to get info that really should be hidden in
particular modules */
static int client_fd = -1;
/* What to print out on a client disconnect error. */
static char client_ip_string[INET6_ADDRSTRLEN];
/****************************************************************************
Return true if a string could be an IPv4 address.
****************************************************************************/
bool is_ipaddress_v4(const char *str)
{
int ret = -1;
struct in_addr dest;
ret = inet_pton(AF_INET, str, &dest);
if (ret > 0) {
return true;
}
return false;
}
/****************************************************************************
Return true if a string could be an IPv4 or IPv6 address.
****************************************************************************/
bool is_ipaddress(const char *str)
{
int ret = -1;
#if defined(HAVE_IPV6)
struct in6_addr dest6;
ret = inet_pton(AF_INET6, str, &dest6);
if (ret > 0) {
return true;
}
#endif
return is_ipaddress_v4(str);
}
/*******************************************************************
Wrap getaddrinfo...
******************************************************************/
static bool interpret_string_addr_internal(struct addrinfo **ppres,
const char *str, int flags)
{
int ret;
struct addrinfo hints;
memset(&hints, '\0', sizeof(hints));
/* By default make sure it supports TCP. */
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = flags;
ret = getaddrinfo(str, NULL,
&hints,
ppres);
if (ret) {
DEBUG(3,("interpret_string_addr_interal: getaddrinfo failed "
"for name %s [%s]\n",
str,
gai_strerror(ret) ));
return false;
}
return true;
}
/****************************************************************************
Interpret an internet address or name into an IP address in 4 byte form.
RETURNS IN NETWORK BYTE ORDER (big endian).
****************************************************************************/
uint32 interpret_addr(const char *str)
{
uint32 ret;
/* If it's in the form of an IP address then
* get the lib to interpret it */
if (is_ipaddress_v4(str)) {
struct in_addr dest;
if (inet_pton(AF_INET, str, &dest) <= 0) {
/* Error - this shouldn't happen ! */
DEBUG(0,("interpret_addr: inet_pton failed "
"host %s\n",
str));
return 0;
}
ret = dest.s_addr; /* NETWORK BYTE ORDER ! */
} else {
/* Otherwise assume it's a network name of some sort and use
getadddrinfo. */
struct addrinfo *res = NULL;
struct addrinfo *res_list = NULL;
if (!interpret_string_addr_internal(&res_list,
str,
AI_ADDRCONFIG)) {
DEBUG(3,("interpret_addr: Unknown host. %s\n",str));
return 0;
}
/* Find the first IPv4 address. */
for (res = res_list; res; res = res->ai_next) {
if (res->ai_family != AF_INET) {
continue;
}
if (res->ai_addr == NULL) {
continue;
}
break;
}
if(res == NULL) {
DEBUG(3,("interpret_addr: host address is "
"invalid for host %s\n",str));
if (res_list) {
freeaddrinfo(res_list);
}
return 0;
}
putip((char *)&ret,
&((struct sockaddr_in *)res->ai_addr)->sin_addr.s_addr);
if (res_list) {
freeaddrinfo(res_list);
}
}
/* This is so bogus - all callers need fixing... JRA. */
if (ret == (uint32)-1) {
return 0;
}
return ret;
}
/*******************************************************************
A convenient addition to interpret_addr().
******************************************************************/
struct in_addr *interpret_addr2(const char *str)
{
static struct in_addr ret;
uint32 a = interpret_addr(str);
ret.s_addr = a;
return(&ret);
}
/*******************************************************************
Map a text hostname or IP address (IPv4 or IPv6) into a
struct sockaddr_storage.
******************************************************************/
bool interpret_string_addr(struct sockaddr_storage *pss,
const char *str,
int flags)
{
struct addrinfo *res = NULL;
memset(pss,'\0', sizeof(*pss));
if (!interpret_string_addr_internal(&res, str, flags|AI_ADDRCONFIG)) {
return false;
}
if (!res) {
return false;
}
/* Copy the first sockaddr. */
memcpy(pss, res->ai_addr, res->ai_addrlen);
freeaddrinfo(res);
return true;
}
/*******************************************************************
Check if an IPv7 is 127.0.0.1
******************************************************************/
bool is_loopback_ip_v4(struct in_addr ip)
{
struct in_addr a;
a.s_addr = htonl(INADDR_LOOPBACK);
return(ip.s_addr == a.s_addr);
}
/*******************************************************************
Check if a struct sockaddr_storage is the loopback address.
******************************************************************/
bool is_loopback_addr(const struct sockaddr_storage *pss)
{
#if defined(HAVE_IPV6)
if (pss->ss_family == AF_INET) {
struct in6_addr *pin6 =
&((struct sockaddr_in6 *)pss)->sin6_addr;
return IN6_IS_ADDR_LOOPBACK(pin6);
}
#endif
if (pss->ss_family == AF_INET) {
struct in_addr *pin = &((struct sockaddr_in *)pss)->sin_addr;
return is_loopback_ip_v4(*pin);
}
return false;
}
/*******************************************************************
Check if an IPv4 is 0.0.0.0.
******************************************************************/
bool is_zero_ip_v4(struct in_addr ip)
{
uint32 a;
putip((char *)&a,(char *)&ip);
return(a == 0);
}
/*******************************************************************
Check if a struct sockaddr_storage has an unspecified address.
******************************************************************/
bool is_zero_addr(const struct sockaddr_storage *pss)
{
#if defined(HAVE_IPV6)
if (pss->ss_family == AF_INET) {
struct in6_addr *pin6 =
&((struct sockaddr_in6 *)pss)->sin6_addr;
return IN6_IS_ADDR_UNSPECIFIED(pin6);
}
#endif
if (pss->ss_family == AF_INET) {
struct in_addr *pin = &((struct sockaddr_in *)pss)->sin_addr;
return is_zero_ip_v4(*pin);
}
return false;
}
/*******************************************************************
Set an IP to 0.0.0.0.
******************************************************************/
void zero_ip_v4(struct in_addr *ip)
{
static bool init;
static struct in_addr ipzero;
if (!init) {
ipzero = *interpret_addr2("0.0.0.0");
init = true;
}
*ip = ipzero;
}
/*******************************************************************
Are two IPs on the same subnet - IPv4 version ?
********************************************************************/
bool same_net_v4(struct in_addr ip1,struct in_addr ip2,struct in_addr mask)
{
uint32 net1,net2,nmask;
nmask = ntohl(mask.s_addr);
net1 = ntohl(ip1.s_addr);
net2 = ntohl(ip2.s_addr);
return((net1 & nmask) == (net2 & nmask));
}
/*******************************************************************
Convert an IPv4 struct in_addr to a struct sockaddr_storage.
********************************************************************/
void in_addr_to_sockaddr_storage(struct sockaddr_storage *ss,
struct in_addr ip)
{
struct sockaddr_in *sa = (struct sockaddr_in *)ss;
memset(ss, '\0', sizeof(*ss));
ss->ss_family = AF_INET;
sa->sin_addr = ip;
}
#if defined(HAVE_IPV6)
/*******************************************************************
Convert an IPv6 struct in_addr to a struct sockaddr_storage.
********************************************************************/
void in6_addr_to_sockaddr_storage(struct sockaddr_storage *ss,
struct in6_addr ip)
{
struct sockaddr_in6 *sa = (struct sockaddr_in6 *)ss;
memset(ss, '\0', sizeof(*ss));
ss->ss_family = AF_INET6;
sa->sin6_addr = ip;
}
#endif
/*******************************************************************
Are two IPs on the same subnet?
********************************************************************/
bool same_net(const struct sockaddr_storage *ip1,
const struct sockaddr_storage *ip2,
const struct sockaddr_storage *mask)
{
if (ip1->ss_family != ip2->ss_family) {
/* Never on the same net. */
return false;
}
#if defined(HAVE_IPV6)
if (ip1->ss_family == AF_INET6) {
struct sockaddr_in6 ip1_6 = *(struct sockaddr_in6 *)ip1;
struct sockaddr_in6 ip2_6 = *(struct sockaddr_in6 *)ip2;
struct sockaddr_in6 mask_6 = *(struct sockaddr_in6 *)mask;
char *p1 = (char *)&ip1_6.sin6_addr;
char *p2 = (char *)&ip2_6.sin6_addr;
char *m = (char *)&mask_6.sin6_addr;
int i;
for (i = 0; i < sizeof(struct in6_addr); i++) {
*p1++ &= *m;
*p2++ &= *m;
m++;
}
return (memcmp(&ip1_6.sin6_addr,
&ip2_6.sin6_addr,
sizeof(struct in6_addr)) == 0);
}
#endif
if (ip1->ss_family == AF_INET) {
return same_net_v4(((const struct sockaddr_in *)ip1)->sin_addr,
((const struct sockaddr_in *)ip2)->sin_addr,
((const struct sockaddr_in *)mask)->sin_addr);
}
return false;
}
/*******************************************************************
Are two sockaddr_storage's the same family and address ? Ignore port etc.
********************************************************************/
bool addr_equal(const struct sockaddr_storage *ip1,
const struct sockaddr_storage *ip2)
{
if (ip1->ss_family != ip2->ss_family) {
/* Never the same. */
return false;
}
#if defined(HAVE_IPV6)
if (ip1->ss_family == AF_INET6) {
return (memcmp(&((const struct sockaddr_in6 *)ip1)->sin6_addr,
&((const struct sockaddr_in6 *)ip2)->sin6_addr,
sizeof(struct in6_addr)) == 0);
}
#endif
if (ip1->ss_family == AF_INET) {
return (memcmp(&((const struct sockaddr_in *)ip1)->sin_addr,
&((const struct sockaddr_in *)ip2)->sin_addr,
sizeof(struct in_addr)) == 0);
}
return false;
}
/****************************************************************************
Is an IP address the INADDR_ANY or in6addr_any value ?
****************************************************************************/
bool is_address_any(const struct sockaddr_storage *psa)
{
#if defined(HAVE_IPV6)
if (psa->ss_family == AF_INET6) {
struct sockaddr_in6 *si6 = (struct sockaddr_in6 *)psa;
if (memcmp(&in6addr_any,
&si6->sin6_addr,
sizeof(in6addr_any)) == 0) {
return true;
}
return false;
}
#endif
if (psa->ss_family == AF_INET) {
struct sockaddr_in *si = (struct sockaddr_in *)psa;
if (si->sin_addr.s_addr == INADDR_ANY) {
return true;
}
return false;
}
return false;
}
/****************************************************************************
Print out an IPv4 or IPv6 address from a struct sockaddr_storage.
****************************************************************************/
char *print_sockaddr(char *dest,
size_t destlen,
const struct sockaddr_storage *psa,
socklen_t psalen)
{
if (destlen > 0) {
dest[0] = '\0';
}
(void)getnameinfo((const struct sockaddr *)psa,
psalen,
dest, destlen,
NULL, 0,
NI_NUMERICHOST);
return dest;
}
/****************************************************************************
Set the global client_fd variable.
****************************************************************************/
void client_setfd(int fd)
{
client_fd = fd;
safe_strcpy(client_ip_string,
get_peer_addr(client_fd),
sizeof(client_ip_string)-1);
}
/****************************************************************************
Return a static string of an IP address (IPv4 or IPv6).
****************************************************************************/
static const char *get_socket_addr(int fd)
{
struct sockaddr_storage sa;
socklen_t length = sizeof(sa);
static char addr_buf[INET6_ADDRSTRLEN];
/* Ok, returning a hard coded IPv4 address
* is bogus, but it's just as bogus as a
* zero IPv6 address. No good choice here.
*/
safe_strcpy(addr_buf, "0.0.0.0", sizeof(addr_buf)-1);
if (fd == -1) {
return addr_buf;
}
if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
DEBUG(0,("getsockname failed. Error was %s\n",
strerror(errno) ));
return addr_buf;
}
return print_sockaddr(addr_buf, sizeof(addr_buf), &sa, length);
}
/****************************************************************************
Return the port number we've bound to on a socket.
****************************************************************************/
static int get_socket_port(int fd)
{
struct sockaddr_storage sa;
socklen_t length = sizeof(sa);
if (fd == -1) {
return -1;
}
if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
DEBUG(0,("getpeername failed. Error was %s\n",
strerror(errno) ));
return -1;
}
#if defined(HAVE_IPV6)
if (sa.ss_family == AF_INET6) {
return ntohs(((struct sockaddr_in6 *)&sa)->sin6_port);
}
#endif
if (sa.ss_family == AF_INET) {
return ntohs(((struct sockaddr_in *)&sa)->sin_port);
}
return -1;
}
const char *client_name(void)
{
return get_peer_name(client_fd,false);
}
const char *client_addr(void)
{
return get_peer_addr(client_fd);
}
const char *client_socket_addr(void)
{
return get_socket_addr(client_fd);
}
int client_socket_port(void)
{
return get_socket_port(client_fd);
}
int smb_read_error = 0;
/****************************************************************************
Determine if a file descriptor is in fact a socket.
****************************************************************************/
bool is_a_socket(int fd)
{
int v;
socklen_t l;
l = sizeof(int);
return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
}
enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};
typedef struct smb_socket_option {
const char *name;
int level;
int option;
int value;
int opttype;
} smb_socket_option;
static const smb_socket_option socket_options[] = {
{"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
{"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
{"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
#ifdef TCP_NODELAY
{"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
#endif
#ifdef TCP_KEEPCNT
{"TCP_KEEPCNT", IPPROTO_TCP, TCP_KEEPCNT, 0, OPT_INT},
#endif
#ifdef TCP_KEEPIDLE
{"TCP_KEEPIDLE", IPPROTO_TCP, TCP_KEEPIDLE, 0, OPT_INT},
#endif
#ifdef TCP_KEEPINTVL
{"TCP_KEEPINTVL", IPPROTO_TCP, TCP_KEEPINTVL, 0, OPT_INT},
#endif
#ifdef IPTOS_LOWDELAY
{"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
#endif
#ifdef IPTOS_THROUGHPUT
{"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
#endif
#ifdef SO_REUSEPORT
{"SO_REUSEPORT", SOL_SOCKET, SO_REUSEPORT, 0, OPT_BOOL},
#endif
#ifdef SO_SNDBUF
{"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
#endif
#ifdef SO_RCVBUF
{"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
#endif
#ifdef SO_SNDLOWAT
{"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
#endif
#ifdef SO_RCVLOWAT
{"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
#endif
#ifdef SO_SNDTIMEO
{"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
#endif
#ifdef SO_RCVTIMEO
{"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
#endif
#ifdef TCP_FASTACK
{"TCP_FASTACK", IPPROTO_TCP, TCP_FASTACK, 0, OPT_INT},
#endif
{NULL,0,0,0,0}};
/****************************************************************************
Print socket options.
****************************************************************************/
static void print_socket_options(int s)
{
int value;
socklen_t vlen = 4;
const smb_socket_option *p = &socket_options[0];
/* wrapped in if statement to prevent streams
* leak in SCO Openserver 5.0 */
/* reported on samba-technical --jerry */
if ( DEBUGLEVEL >= 5 ) {
for (; p->name != NULL; p++) {
if (getsockopt(s, p->level, p->option,
(void *)&value, &vlen) == -1) {
DEBUG(5,("Could not test socket option %s.\n",
p->name));
} else {
DEBUG(5,("socket option %s = %d\n",
p->name,value));
}
}
}
}
/****************************************************************************
Set user socket options.
****************************************************************************/
void set_socket_options(int fd, const char *options)
{
fstring tok;
while (next_token(&options,tok," \t,", sizeof(tok))) {
int ret=0,i;
int value = 1;
char *p;
bool got_value = false;
if ((p = strchr_m(tok,'='))) {
*p = 0;
value = atoi(p+1);
got_value = true;
}
for (i=0;socket_options[i].name;i++)
if (strequal(socket_options[i].name,tok))
break;
if (!socket_options[i].name) {
DEBUG(0,("Unknown socket option %s\n",tok));
continue;
}
switch (socket_options[i].opttype) {
case OPT_BOOL:
case OPT_INT:
ret = setsockopt(fd,socket_options[i].level,
socket_options[i].option,
(char *)&value,sizeof(int));
break;
case OPT_ON:
if (got_value)
DEBUG(0,("syntax error - %s "
"does not take a value\n",tok));
{
int on = socket_options[i].value;
ret = setsockopt(fd,socket_options[i].level,
socket_options[i].option,
(char *)&on,sizeof(int));
}
break;
}
if (ret != 0) {
DEBUG(0,("Failed to set socket option %s (Error %s)\n",
tok, strerror(errno) ));
}
}
print_socket_options(fd);
}
/****************************************************************************
Read from a socket.
****************************************************************************/
ssize_t read_udp_v4_socket(int fd,
char *buf,
size_t len,
struct sockaddr_storage *psa)
{
ssize_t ret;
socklen_t socklen = sizeof(*psa);
struct sockaddr_in *si = (struct sockaddr_in *)psa;
memset((char *)psa,'\0',socklen);
ret = (ssize_t)sys_recvfrom(fd,buf,len,0,
(struct sockaddr *)psa,&socklen);
if (ret <= 0) {
/* Don't print a low debug error for a non-blocking socket. */
if (errno == EAGAIN) {
DEBUG(10,("read_udp_v4_socket: returned EAGAIN\n"));
} else {
DEBUG(2,("read_udp_v4_socket: failed. errno=%s\n",
strerror(errno)));
}
return 0;
}
if (psa->ss_family != AF_INET) {
DEBUG(2,("read_udp_v4_socket: invalid address family %d "
"(not IPv4)\n", (int)psa->ss_family));
return 0;
}
DEBUG(10,("read_udp_v4_socket: ip %s port %d read: %lu\n",
inet_ntoa(si->sin_addr),
si->sin_port,
(unsigned long)ret));
return ret;
}
/****************************************************************************
Read data from a socket with a timout in msec.
mincount = if timeout, minimum to read before returning
maxcount = number to be read.
time_out = timeout in milliseconds
****************************************************************************/
ssize_t read_socket_with_timeout(int fd,
char *buf,
size_t mincnt,
size_t maxcnt,
unsigned int time_out)
{
fd_set fds;
int selrtn;
ssize_t readret;
size_t nread = 0;
struct timeval timeout;
/* just checking .... */
if (maxcnt <= 0)
return(0);
smb_read_error = 0;
/* Blocking read */
if (time_out == 0) {
if (mincnt == 0) {
mincnt = maxcnt;
}
while (nread < mincnt) {
readret = sys_read(fd, buf + nread, maxcnt - nread);
if (readret == 0) {
DEBUG(5,("read_socket_with_timeout: "
"blocking read. EOF from client.\n"));
smb_read_error = READ_EOF;
return -1;
}
if (readret == -1) {
if (fd == client_fd) {
/* Try and give an error message
* saying what client failed. */
DEBUG(0,("read_socket_with_timeout: "
"client %s read error = %s.\n",
client_ip_string,
strerror(errno) ));
} else {
DEBUG(0,("read_socket_with_timeout: "
"read error = %s.\n",
strerror(errno) ));
}
smb_read_error = READ_ERROR;
return -1;
}
nread += readret;
}
return((ssize_t)nread);
}
/* Most difficult - timeout read */
/* If this is ever called on a disk file and
mincnt is greater then the filesize then
system performance will suffer severely as
select always returns true on disk files */
/* Set initial timeout */
timeout.tv_sec = (time_t)(time_out / 1000);
timeout.tv_usec = (long)(1000 * (time_out % 1000));
for (nread=0; nread < mincnt; ) {
FD_ZERO(&fds);
FD_SET(fd,&fds);
selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout);
/* Check if error */
if (selrtn == -1) {
/* something is wrong. Maybe the socket is dead? */
if (fd == client_fd) {
/* Try and give an error message saying
* what client failed. */
DEBUG(0,("read_socket_with_timeout: timeout "
"read for client %s. select error = %s.\n",
client_ip_string, strerror(errno) ));
} else {
DEBUG(0,("read_socket_with_timeout: timeout "
"read. select error = %s.\n",
strerror(errno) ));
}
smb_read_error = READ_ERROR;
return -1;
}
/* Did we timeout ? */
if (selrtn == 0) {
DEBUG(10,("read_socket_with_timeout: timeout read. "
"select timed out.\n"));
smb_read_error = READ_TIMEOUT;
return -1;
}
readret = sys_read(fd, buf+nread, maxcnt-nread);
if (readret == 0) {
/* we got EOF on the file descriptor */
DEBUG(5,("read_socket_with_timeout: timeout read. "
"EOF from client.\n"));
smb_read_error = READ_EOF;
return -1;
}
if (readret == -1) {
/* the descriptor is probably dead */
if (fd == client_fd) {
/* Try and give an error message
* saying what client failed. */
DEBUG(0,("read_socket_with_timeout: timeout "
"read to client %s. read error = %s.\n",
client_ip_string, strerror(errno) ));
} else {
DEBUG(0,("read_socket_with_timeout: timeout "
"read. read error = %s.\n",
strerror(errno) ));
}
smb_read_error = READ_ERROR;
return -1;
}
nread += readret;
}
/* Return the number we got */
return (ssize_t)nread;
}
/****************************************************************************
Read data from the client, reading exactly N bytes.
****************************************************************************/
ssize_t read_data(int fd,char *buffer,size_t N)
{
ssize_t ret;
size_t total=0;
smb_read_error = 0;
while (total < N) {
ret = sys_read(fd,buffer + total,N - total);
if (ret == 0) {
DEBUG(10,("read_data: read of %d returned 0. "
"Error = %s\n",
(int)(N - total), strerror(errno) ));
smb_read_error = READ_EOF;
return 0;
}
if (ret == -1) {
if (fd == client_fd) {
/* Try and give an error message saying
* what client failed. */
DEBUG(0,("read_data: read failure for %d "
"bytes to client %s. Error = %s\n",
(int)(N - total),
client_ip_string,
strerror(errno) ));
} else {
DEBUG(0,("read_data: read failure for %d. "
"Error = %s\n",
(int)(N - total),
strerror(errno) ));
}
smb_read_error = READ_ERROR;
return -1;
}
total += ret;
}
return (ssize_t)total;
}
/****************************************************************************
Write data to a fd.
****************************************************************************/
ssize_t write_data(int fd, const char *buffer, size_t N)
{
size_t total=0;
ssize_t ret;
while (total < N) {
ret = sys_write(fd,buffer + total,N - total);
if (ret == -1) {
if (fd == client_fd) {
/* Try and give an error message saying
* what client failed. */
DEBUG(0,("write_data: write failure in "
"writing to client %s. Error %s\n",
client_ip_string, strerror(errno) ));
} else {
DEBUG(0,("write_data: write failure. "
"Error = %s\n", strerror(errno) ));
}
return -1;
}
if (ret == 0) {
return total;
}
total += ret;
}
return (ssize_t)total;
}
/****************************************************************************
Send a keepalive packet (rfc1002).
****************************************************************************/
bool send_keepalive(int client)
{
unsigned char buf[4];
buf[0] = SMBkeepalive;
buf[1] = buf[2] = buf[3] = 0;
return(write_data(client,(char *)buf,4) == 4);
}
/****************************************************************************
Read 4 bytes of a smb packet and return the smb length of the packet.
Store the result in the buffer.
This version of the function will return a length of zero on receiving
a keepalive packet.
Timeout is in milliseconds.
****************************************************************************/
static ssize_t read_smb_length_return_keepalive(int fd,
char *inbuf,
unsigned int timeout)
{
ssize_t len=0;
int msg_type;
bool ok = false;
while (!ok) {
if (timeout > 0) {
ok = (read_socket_with_timeout(fd,inbuf,4,4,timeout)
== 4);
} else {
ok = (read_data(fd,inbuf,4) == 4);
}
if (!ok) {
return -1;
}
len = smb_len(inbuf);
msg_type = CVAL(inbuf,0);
if (msg_type == SMBkeepalive) {
DEBUG(5,("Got keepalive packet\n"));
}
}
DEBUG(10,("got smb length of %lu\n",(unsigned long)len));
return(len);
}
/****************************************************************************
Read 4 bytes of a smb packet and return the smb length of the packet.
Store the result in the buffer. This version of the function will
never return a session keepalive (length of zero).
Timeout is in milliseconds.
****************************************************************************/
ssize_t read_smb_length(int fd, char *inbuf, unsigned int timeout)
{
ssize_t len;
for(;;) {
len = read_smb_length_return_keepalive(fd, inbuf, timeout);
if(len < 0)
return len;
/* Ignore session keepalives. */
if(CVAL(inbuf,0) != SMBkeepalive)
break;
}
DEBUG(10,("read_smb_length: got smb length of %lu\n",
(unsigned long)len));
return len;
}
/****************************************************************************
Read an smb from a fd. Note that the buffer *MUST* be of size
BUFFER_SIZE+SAFETY_MARGIN.
The timeout is in milliseconds.
This function will return on receipt of a session keepalive packet.
maxlen is the max number of bytes to return, not including the 4 byte
length. If zero it means BUFFER_SIZE+SAFETY_MARGIN limit.
Doesn't check the MAC on signed packets.
****************************************************************************/
ssize_t receive_smb_raw(int fd,
char *buffer,
unsigned int timeout,
size_t maxlen)
{
ssize_t len,ret;
smb_read_error = 0;
len = read_smb_length_return_keepalive(fd,buffer,timeout);
if (len < 0) {
DEBUG(10,("receive_smb_raw: length < 0!\n"));
/*
* Correct fix. smb_read_error may have already been
* set. Only set it here if not already set. Global
* variables still suck :-). JRA.
*/
if (smb_read_error == 0)
smb_read_error = READ_ERROR;
return -1;
}
/*
* A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes
* of header. Don't print the error if this fits.... JRA.
*/
if (len > (BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE)) {
DEBUG(0,("Invalid packet length! (%lu bytes).\n",
(unsigned long)len));
if (len > BUFFER_SIZE + (SAFETY_MARGIN/2)) {
/*
* Correct fix. smb_read_error may have already been
* set. Only set it here if not already set. Global
* variables still suck :-). JRA.
*/
if (smb_read_error == 0)
smb_read_error = READ_ERROR;
return -1;
}
}
if(len > 0) {
if (maxlen) {
len = MIN(len,maxlen);
}
if (timeout > 0) {
ret = read_socket_with_timeout(fd,
buffer+4,
len,
len,
timeout);
} else {
ret = read_data(fd,buffer+4,len);
}
if (ret != len) {
if (smb_read_error == 0) {
smb_read_error = READ_ERROR;
}
return -1;
}
/* not all of samba3 properly checks for packet-termination
* of strings. This ensures that we don't run off into
* empty space. */
SSVAL(buffer+4,len, 0);
}
return len;
}
static ssize_t receive_smb_raw_talloc(TALLOC_CTX *mem_ctx, int fd,
char **buffer, unsigned int timeout)
{
char lenbuf[4];
ssize_t len,ret;
smb_read_error = 0;
len = read_smb_length_return_keepalive(fd, lenbuf, timeout);
if (len < 0) {
DEBUG(10,("receive_smb_raw: length < 0!\n"));
/*
* Correct fix. smb_read_error may have already been
* set. Only set it here if not already set. Global
* variables still suck :-). JRA.
*/
if (smb_read_error == 0)
smb_read_error = READ_ERROR;
return -1;
}
/*
* A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes
* of header. Don't print the error if this fits.... JRA.
*/
if (len > (BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE)) {
DEBUG(0,("Invalid packet length! (%lu bytes).\n",
(unsigned long)len));
if (len > BUFFER_SIZE + (SAFETY_MARGIN/2)) {
/*
* Correct fix. smb_read_error may have already been
* set. Only set it here if not already set. Global
* variables still suck :-). JRA.
*/
if (smb_read_error == 0)
smb_read_error = READ_ERROR;
return -1;
}
}
/*
* The +4 here can't wrap, we've checked the length above already.
*/
*buffer = TALLOC_ARRAY(mem_ctx, char, len+4);
if (*buffer == NULL) {
DEBUG(0, ("Could not allocate inbuf of length %d\n",
(int)len+4));
if (smb_read_error == 0)
smb_read_error = READ_ERROR;
return -1;
}
memcpy(*buffer, lenbuf, sizeof(lenbuf));
if(len > 0) {
if (timeout > 0) {
ret = read_socket_with_timeout(fd,(*buffer)+4, len,
len, timeout);
} else {
ret = read_data(fd, (*buffer)+4, len);
}
if (ret != len) {
if (smb_read_error == 0) {
smb_read_error = READ_ERROR;
}
return -1;
}
}
return len + 4;
}
/****************************************************************************
Wrapper for receive_smb_raw().
Checks the MAC on signed packets.
****************************************************************************/
bool receive_smb(int fd, char *buffer, unsigned int timeout)
{
if (receive_smb_raw(fd, buffer, timeout, 0) < 0) {
return false;
}
/* Check the incoming SMB signature. */
if (!srv_check_sign_mac(buffer, true)) {
DEBUG(0, ("receive_smb: SMB Signature verification "
"failed on incoming packet!\n"));
if (smb_read_error == 0) {
smb_read_error = READ_BAD_SIG;
}
return false;
}
return true;
}
ssize_t receive_smb_talloc(TALLOC_CTX *mem_ctx, int fd, char **buffer,
unsigned int timeout)
{
ssize_t len;
len = receive_smb_raw_talloc(mem_ctx, fd, buffer, timeout);
if (len < 0) {
return -1;
}
/* Check the incoming SMB signature. */
if (!srv_check_sign_mac(*buffer, true)) {
DEBUG(0, ("receive_smb: SMB Signature verification failed on "
"incoming packet!\n"));
if (smb_read_error == 0) {
smb_read_error = READ_BAD_SIG;
}
return -1;
}
return len;
}
/****************************************************************************
Send an smb to a fd.
****************************************************************************/
bool send_smb(int fd, char *buffer)
{
size_t len;
size_t nwritten=0;
ssize_t ret;
/* Sign the outgoing packet if required. */
srv_calculate_sign_mac(buffer);
len = smb_len(buffer) + 4;
while (nwritten < len) {
ret = write_data(fd,buffer+nwritten,len - nwritten);
if (ret <= 0) {
DEBUG(0,("Error writing %d bytes to client. %d. (%s)\n",
(int)len,(int)ret, strerror(errno) ));
return false;
}
nwritten += ret;
}
return true;
}
/****************************************************************************
Open a socket of the specified type, port, and address for incoming data.
****************************************************************************/
int open_socket_in(int type,
int port,
int dlevel,
uint32 socket_addr, /* NETWORK BYTE ORDER */
bool rebind )
{
struct sockaddr_in sock;
int res;
memset( (char *)&sock, '\0', sizeof(sock) );
#ifdef HAVE_SOCK_SIN_LEN
sock.sin_len = sizeof(sock);
#endif
sock.sin_port = htons( port );
sock.sin_family = AF_INET;
sock.sin_addr.s_addr = socket_addr;
res = socket( AF_INET, type, 0 );
if( res == -1 ) {
if( DEBUGLVL(0) ) {
dbgtext( "open_socket_in(): socket() call failed: " );
dbgtext( "%s\n", strerror( errno ) );
}
return -1;
}
/* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
{
int val = rebind ? 1 : 0;
if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,
(char *)&val,sizeof(val)) == -1 ) {
if( DEBUGLVL( dlevel ) ) {
dbgtext( "open_socket_in(): setsockopt: " );
dbgtext( "SO_REUSEADDR = %s ",
val?"true":"false" );
dbgtext( "on port %d failed ", port );
dbgtext( "with error = %s\n", strerror(errno) );
}
}
#ifdef SO_REUSEPORT
if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,
(char *)&val,sizeof(val)) == -1 ) {
if( DEBUGLVL( dlevel ) ) {
dbgtext( "open_socket_in(): setsockopt: ");
dbgtext( "SO_REUSEPORT = %s ",
val?"true":"false" );
dbgtext( "on port %d failed ", port );
dbgtext( "with error = %s\n", strerror(errno) );
}
}
#endif /* SO_REUSEPORT */
}
/* now we've got a socket - we need to bind it */
if( bind( res, (struct sockaddr *)&sock, sizeof(sock) ) == -1 ) {
if( DEBUGLVL(dlevel) && (port == SMB_PORT1 ||
port == SMB_PORT2 || port == NMB_PORT) ) {
dbgtext( "bind failed on port %d ", port );
dbgtext( "socket_addr = %s.\n",
inet_ntoa( sock.sin_addr ) );
dbgtext( "Error = %s\n", strerror(errno) );
}
close( res );
return -1;
}
DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
return( res );
}
/****************************************************************************
Create an outgoing socket. timeout is in milliseconds.
**************************************************************************/
int open_socket_out(int type, struct in_addr *addr, int port ,int timeout)
{
struct sockaddr_in sock_out;
int res,ret;
int connect_loop = 10;
int increment = 10;
/* create a socket to write to */
res = socket(PF_INET, type, 0);
if (res == -1) {
DEBUG(0,("socket error (%s)\n", strerror(errno)));
return -1;
}
if (type != SOCK_STREAM)
return(res);
memset((char *)&sock_out,'\0',sizeof(sock_out));
putip((char *)&sock_out.sin_addr,(char *)addr);
sock_out.sin_port = htons( port );
sock_out.sin_family = PF_INET;
/* set it non-blocking */
set_blocking(res,false);
DEBUG(3,("Connecting to %s at port %d\n",inet_ntoa(*addr),port));
/* and connect it to the destination */
connect_again:
ret = connect(res,(struct sockaddr *)&sock_out,sizeof(sock_out));
/* Some systems return EAGAIN when they mean EINPROGRESS */
if (ret < 0 && (errno == EINPROGRESS || errno == EALREADY ||
errno == EAGAIN) && (connect_loop < timeout) ) {
smb_msleep(connect_loop);
timeout -= connect_loop;
connect_loop += increment;
if (increment < 250) {
/* After 8 rounds we end up at a max of 255 msec */
increment *= 1.5;
}
goto connect_again;
}
if (ret < 0 && (errno == EINPROGRESS || errno == EALREADY ||
errno == EAGAIN)) {
DEBUG(1,("timeout connecting to %s:%d\n",
inet_ntoa(*addr),port));
close(res);
return -1;
}
#ifdef EISCONN
if (ret < 0 && errno == EISCONN) {
errno = 0;
ret = 0;
}
#endif
if (ret < 0) {
DEBUG(2,("error connecting to %s:%d (%s)\n",
inet_ntoa(*addr),port,strerror(errno)));
close(res);
return -1;
}
/* set it blocking again */
set_blocking(res,true);
return res;
}
/****************************************************************************
Create an outgoing TCP socket to any of the addrs. This is for
simultaneous connects to port 445 and 139 of a host or even a variety
of DC's all of which are equivalent for our purposes.
**************************************************************************/
bool open_any_socket_out(struct sockaddr_in *addrs, int num_addrs,
int timeout, int *fd_index, int *fd)
{
int i, resulting_index, res;
int *sockets;
bool good_connect;
fd_set r_fds, wr_fds;
struct timeval tv;
int maxfd;
int connect_loop = 10000; /* 10 milliseconds */
timeout *= 1000; /* convert to microseconds */
sockets = SMB_MALLOC_ARRAY(int, num_addrs);
if (sockets == NULL)
return false;
resulting_index = -1;
for (i=0; imaxfd)
maxfd = sockets[i];
}
tv.tv_sec = 0;
tv.tv_usec = connect_loop;
res = sys_select_intr(maxfd+1, &r_fds, &wr_fds, NULL, &tv);
if (res < 0)
goto done;
if (res == 0)
goto next_round;
for (i=0; i timeout)
connect_loop = timeout;
goto connect_again;
done:
for (i=0; i= 0)
close(sockets[i]);
}
if (resulting_index >= 0) {
*fd_index = resulting_index;
*fd = sockets[*fd_index];
set_blocking(*fd, true);
}
free(sockets);
return (resulting_index >= 0);
}
/****************************************************************************
Open a connected UDP socket to host on port
**************************************************************************/
int open_udp_socket(const char *host, int port)
{
int type = SOCK_DGRAM;
struct sockaddr_in sock_out;
int res;
struct in_addr *addr;
addr = interpret_addr2(host);
res = socket(PF_INET, type, 0);
if (res == -1) {
return -1;
}
memset((char *)&sock_out,'\0',sizeof(sock_out));
putip((char *)&sock_out.sin_addr,(char *)addr);
sock_out.sin_port = htons(port);
sock_out.sin_family = PF_INET;
if (connect(res,(struct sockaddr *)&sock_out,sizeof(sock_out))) {
close(res);
return -1;
}
return res;
}
/*******************************************************************
Return the IP addr of the remote end of a socket as a string.
Optionally return the struct sockaddr_storage.
******************************************************************/
static const char *get_peer_addr_internal(int fd,
struct sockaddr_storage *pss,
socklen_t *plength)
{
struct sockaddr_storage ss;
socklen_t length = sizeof(ss);
static char addr_buf[INET6_ADDRSTRLEN];
safe_strcpy(addr_buf,"0.0.0.0",sizeof(addr_buf)-1);
if (fd == -1) {
return addr_buf;
}
if (pss == NULL) {
pss = &ss;
}
if (plength == NULL) {
plength = &length;
}
if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
DEBUG(0,("getpeername failed. Error was %s\n",
strerror(errno) ));
return addr_buf;
}
print_sockaddr(addr_buf,
sizeof(addr_buf),
pss,
*plength);
return addr_buf;
}
/*******************************************************************
Matchname - determine if host name matches IP address. Used to
confirm a hostname lookup to prevent spoof attacks.
******************************************************************/
static bool matchname(const char *remotehost,
const struct sockaddr_storage *pss,
socklen_t len)
{
struct addrinfo *res = NULL;
struct addrinfo *ailist = NULL;
char addr_buf[INET6_ADDRSTRLEN];
bool ret = interpret_string_addr_internal(&ailist,
remotehost,
AI_ADDRCONFIG|AI_CANONNAME);
if (!ret || ailist == NULL) {
DEBUG(3,("matchname: getaddrinfo failed for "
"name %s [%s]\n",
remotehost,
gai_strerror(ret) ));
return false;
}
/*
* Make sure that getaddrinfo() returns the "correct" host name.
*/
if (ailist->ai_canonname == NULL ||
(!strequal(remotehost, ailist->ai_canonname) &&
!strequal(remotehost, "localhost"))) {
DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
remotehost,
ailist->ai_canonname ?
ailist->ai_canonname : "(NULL)"));
freeaddrinfo(ailist);
return false;
}
/* Look up the host address in the address list we just got. */
for (res = ailist; res; res = res->ai_next) {
if (!res->ai_addr) {
continue;
}
if (addr_equal((const struct sockaddr_storage *)res->ai_addr,
pss)) {
freeaddrinfo(ailist);
return true;
}
}
/*
* The host name does not map to the original host address. Perhaps
* someone has compromised a name server. More likely someone botched
* it, but that could be dangerous, too.
*/
DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
print_sockaddr(addr_buf,
sizeof(addr_buf),
pss,
len),
ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));
if (ailist) {
freeaddrinfo(ailist);
}
return false;
}
/*******************************************************************
Return the DNS name of the remote end of a socket.
******************************************************************/
const char *get_peer_name(int fd, bool force_lookup)
{
static fstring addr_buf;
static pstring name_buf;
struct sockaddr_storage ss;
socklen_t length = sizeof(ss);
const char *p;
int ret;
pstring tmp_name;
/* reverse lookups can be *very* expensive, and in many
situations won't work because many networks don't link dhcp
with dns. To avoid the delay we avoid the lookup if
possible */
if (!lp_hostname_lookups() && (force_lookup == false)) {
return get_peer_addr(fd);
}
p = get_peer_addr_internal(fd, &ss, &length);
/* it might be the same as the last one - save some DNS work */
if (strcmp(p, addr_buf) == 0) {
return name_buf;
}
pstrcpy(name_buf,"UNKNOWN");
if (fd == -1) {
return name_buf;
}
fstrcpy(addr_buf, p);
/* Look up the remote host name. */
ret = getnameinfo((struct sockaddr *)&ss,
length,
name_buf,
sizeof(name_buf),
NULL,
0,
NI_NUMERICHOST);
if (ret) {
DEBUG(1,("get_peer_name: getnameinfo failed "
"for %s with error %s\n",
p,
gai_strerror(ret)));
pstrcpy(name_buf, p);
} else {
if (!matchname(name_buf, &ss, length)) {
DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
pstrcpy(name_buf,"UNKNOWN");
}
}
/* can't pass the same source and dest strings in when you
use --enable-developer or the clobber_region() call will
get you */
pstrcpy(tmp_name, name_buf );
alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
if (strstr(name_buf,"..")) {
pstrcpy(name_buf, "UNKNOWN");
}
return name_buf;
}
/*******************************************************************
Return the IP addr of the remote end of a socket as a string.
******************************************************************/
const char *get_peer_addr(int fd)
{
return get_peer_addr_internal(fd, NULL, NULL);
}
/*******************************************************************
Create protected unix domain socket.
Some unixes cannot set permissions on a ux-dom-sock, so we
have to make sure that the directory contains the protection
permissions instead.
******************************************************************/
int create_pipe_sock(const char *socket_dir,
const char *socket_name,
mode_t dir_perms)
{
#ifdef HAVE_UNIXSOCKET
struct sockaddr_un sunaddr;
struct stat st;
int sock;
mode_t old_umask;
pstring path;
old_umask = umask(0);
/* Create the socket directory or reuse the existing one */
if (lstat(socket_dir, &st) == -1) {
if (errno == ENOENT) {
/* Create directory */
if (mkdir(socket_dir, dir_perms) == -1) {
DEBUG(0, ("error creating socket directory "
"%s: %s\n", socket_dir,
strerror(errno)));
goto out_umask;
}
} else {
DEBUG(0, ("lstat failed on socket directory %s: %s\n",
socket_dir, strerror(errno)));
goto out_umask;
}
} else {
/* Check ownership and permission on existing directory */
if (!S_ISDIR(st.st_mode)) {
DEBUG(0, ("socket directory %s isn't a directory\n",
socket_dir));
goto out_umask;
}
if ((st.st_uid != sec_initial_uid()) ||
((st.st_mode & 0777) != dir_perms)) {
DEBUG(0, ("invalid permissions on socket directory "
"%s\n", socket_dir));
goto out_umask;
}
}
/* Create the socket file */
sock = socket(AF_UNIX, SOCK_STREAM, 0);
if (sock == -1) {
perror("socket");
goto out_umask;
}
pstr_sprintf(path, "%s/%s", socket_dir, socket_name);
unlink(path);
memset(&sunaddr, 0, sizeof(sunaddr));
sunaddr.sun_family = AF_UNIX;
safe_strcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path)-1);
if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
strerror(errno)));
goto out_close;
}
if (listen(sock, 5) == -1) {
DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
strerror(errno)));
goto out_close;
}
umask(old_umask);
return sock;
out_close:
close(sock);
out_umask:
umask(old_umask);
return -1;
#else
DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
return -1;
#endif /* HAVE_UNIXSOCKET */
}
/****************************************************************************
Get my own canonical name, including domain.
****************************************************************************/
bool get_mydnsfullname(fstring my_dnsname)
{
static fstring dnshostname;
if (!*dnshostname) {
struct addrinfo *res = NULL;
bool ret;
/* get my host name */
if (gethostname(dnshostname, sizeof(dnshostname)) == -1) {
*dnshostname = '\0';
DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
return false;
}
/* Ensure null termination. */
dnshostname[sizeof(dnshostname)-1] = '\0';
ret = interpret_string_addr_internal(&res,
dnshostname,
AI_ADDRCONFIG|AI_CANONNAME);
if (!ret || res == NULL) {
DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
"name %s [%s]\n",
dnshostname,
gai_strerror(ret) ));
return false;
}
/*
* Make sure that getaddrinfo() returns the "correct" host name.
*/
if (res->ai_canonname == NULL) {
DEBUG(3,("get_mydnsfullname: failed to get "
"canonical name for %s\n",
dnshostname));
freeaddrinfo(res);
return false;
}
fstrcpy(dnshostname, res->ai_canonname);
freeaddrinfo(res);
}
fstrcpy(my_dnsname, dnshostname);
return true;
}
/************************************************************
Is this my name ?
************************************************************/
bool is_myname_or_ipaddr(const char *s)
{
fstring name, dnsname;
char *servername;
if (!s) {
return false;
}
/* Santize the string from '\\name' */
fstrcpy(name, s);
servername = strrchr_m(name, '\\' );
if (!servername) {
servername = name;
} else {
servername++;
}
/* Optimize for the common case */
if (strequal(servername, global_myname())) {
return true;
}
/* Check for an alias */
if (is_myname(servername)) {
return true;
}
/* Check for loopback */
if (strequal(servername, "127.0.0.1") ||
strequal(servername, "::1")) {
return true;
}
if (strequal(servername, "localhost")) {
return true;
}
/* Maybe it's my dns name */
if (get_mydnsfullname(dnsname)) {
if (strequal(servername, dnsname)) {
return true;
}
}
/* Handle possible CNAME records - convert to an IP addr. */
if (!is_ipaddress(servername)) {
/* Use DNS to resolve the name, but only the first address */
struct sockaddr_storage ss;
if (interpret_string_addr(&ss, servername,0)) {
print_sockaddr(name,
sizeof(name),
&ss,
sizeof(ss));
servername = name;
}
}
/* Maybe its an IP address? */
if (is_ipaddress(servername)) {
struct sockaddr_storage ss;
struct iface_struct nics[MAX_INTERFACES];
int i, n;
if (!interpret_string_addr(&ss, servername, AI_NUMERICHOST)) {
return false;
}
if (is_zero_addr(&ss) || is_loopback_addr(&ss)) {
return false;
}
n = get_interfaces(nics, MAX_INTERFACES);
for (i=0; i