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os_calls.c
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/**
* xrdp: A Remote Desktop Protocol server.
*
* Copyright (C) Jay Sorg 2004-2013
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* generic operating system calls
*
* put all the os / arch define in here you want
*/
#if defined(HAVE_CONFIG_H)
#include "config_ac.h"
#endif
#if defined(_WIN32)
#include <windows.h>
#include <winsock.h>
#else
/* fix for solaris 10 with gcc 3.3.2 problem */
#if defined(sun) || defined(__sun)
#define ctid_t id_t
#endif
#include <unistd.h>
#include <errno.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/time.h>
#include <sys/times.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <dlfcn.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <signal.h>
#include <fcntl.h>
#include <pwd.h>
#include <time.h>
#include <grp.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <stdio.h>
#include <locale.h>
#include "os_calls.h"
#include "arch.h"
#include "log.h"
/* for clearenv() */
#if defined(_WIN32)
#else
extern char **environ;
#endif
#if defined(__linux__)
#include <linux/unistd.h>
#endif
/* for solaris */
#if !defined(PF_LOCAL)
#define PF_LOCAL AF_UNIX
#endif
#if !defined(INADDR_NONE)
#define INADDR_NONE ((unsigned long)-1)
#endif
static char g_temp_base[128] = "";
static char g_temp_base_org[128] = "";
/*****************************************************************************/
int APP_CC
g_rm_temp_dir(void)
{
if (g_temp_base[0] != 0)
{
if (!g_remove_dir(g_temp_base))
{
printf("g_rm_temp_dir: removing temp directory [%s] failed\n", g_temp_base);
}
g_temp_base[0] = 0;
}
return 0;
}
/*****************************************************************************/
int APP_CC
g_mk_temp_dir(const char *app_name)
{
if (app_name != 0)
{
if (app_name[0] != 0)
{
if (!g_directory_exist("/tmp/.xrdp"))
{
if (!g_create_dir("/tmp/.xrdp"))
{
printf("g_mk_temp_dir: g_create_dir failed\n");
return 1;
}
g_chmod_hex("/tmp/.xrdp", 0x1777);
}
snprintf(g_temp_base, sizeof(g_temp_base),
"/tmp/.xrdp/%s-XXXXXX", app_name);
snprintf(g_temp_base_org, sizeof(g_temp_base_org),
"/tmp/.xrdp/%s-XXXXXX", app_name);
if (mkdtemp(g_temp_base) == 0)
{
printf("g_mk_temp_dir: mkdtemp failed [%s]\n", g_temp_base);
return 1;
}
}
else
{
printf("g_mk_temp_dir: bad app name\n");
return 1;
}
}
else
{
if (g_temp_base_org[0] == 0)
{
printf("g_mk_temp_dir: g_temp_base_org not set\n");
return 1;
}
g_strncpy(g_temp_base, g_temp_base_org, 127);
if (mkdtemp(g_temp_base) == 0)
{
printf("g_mk_temp_dir: mkdtemp failed [%s]\n", g_temp_base);
}
}
return 0;
}
/*****************************************************************************/
void APP_CC
g_init(const char *app_name)
{
#if defined(_WIN32)
WSADATA wsadata;
WSAStartup(2, &wsadata);
#endif
setlocale(LC_CTYPE, "");
g_mk_temp_dir(app_name);
}
/*****************************************************************************/
void APP_CC
g_deinit(void)
{
#if defined(_WIN32)
WSACleanup();
#endif
g_rm_temp_dir();
}
/*****************************************************************************/
/* allocate memory, returns a pointer to it, size bytes are allocated,
if zero is non zero, each byte will be set to zero */
void *APP_CC
g_malloc(int size, int zero)
{
char *rv;
rv = (char *)malloc(size);
if (zero)
{
if (rv != 0)
{
memset(rv, 0, size);
}
}
return rv;
}
/*****************************************************************************/
/* free the memory pointed to by ptr, ptr can be zero */
void APP_CC
g_free(void *ptr)
{
if (ptr != 0)
{
free(ptr);
}
}
/*****************************************************************************/
/* output text to stdout, try to use g_write / g_writeln instead to avoid
linux / windows EOL problems */
void DEFAULT_CC
g_printf(const char *format, ...)
{
va_list ap;
va_start(ap, format);
vfprintf(stdout, format, ap);
va_end(ap);
}
/*****************************************************************************/
void DEFAULT_CC
g_sprintf(char *dest, const char *format, ...)
{
va_list ap;
va_start(ap, format);
vsprintf(dest, format, ap);
va_end(ap);
}
/*****************************************************************************/
void DEFAULT_CC
g_snprintf(char *dest, int len, const char *format, ...)
{
va_list ap;
va_start(ap, format);
vsnprintf(dest, len, format, ap);
va_end(ap);
}
/*****************************************************************************/
void DEFAULT_CC
g_writeln(const char *format, ...)
{
va_list ap;
va_start(ap, format);
vfprintf(stdout, format, ap);
va_end(ap);
#if defined(_WIN32)
g_printf("\r\n");
#else
g_printf("\n");
#endif
}
/*****************************************************************************/
void DEFAULT_CC
g_write(const char *format, ...)
{
va_list ap;
va_start(ap, format);
vfprintf(stdout, format, ap);
va_end(ap);
}
/*****************************************************************************/
/* produce a hex dump */
void APP_CC
g_hexdump(char *p, int len)
{
unsigned char *line;
int i;
int thisline;
int offset;
line = (unsigned char *)p;
offset = 0;
while (offset < len)
{
g_printf("%04x ", offset);
thisline = len - offset;
if (thisline > 16)
{
thisline = 16;
}
for (i = 0; i < thisline; i++)
{
g_printf("%02x ", line[i]);
}
for (; i < 16; i++)
{
g_printf(" ");
}
for (i = 0; i < thisline; i++)
{
g_printf("%c", (line[i] >= 0x20 && line[i] < 0x7f) ? line[i] : '.');
}
g_writeln("");
offset += thisline;
line += thisline;
}
}
/*****************************************************************************/
void APP_CC
g_memset(void *ptr, int val, int size)
{
memset(ptr, val, size);
}
/*****************************************************************************/
void APP_CC
g_memcpy(void *d_ptr, const void *s_ptr, int size)
{
memcpy(d_ptr, s_ptr, size);
}
/*****************************************************************************/
int APP_CC
g_getchar(void)
{
return getchar();
}
/*****************************************************************************/
/*Returns 0 on success*/
int APP_CC
g_tcp_set_no_delay(int sck)
{
int ret = 1; /* error */
#if defined(_WIN32)
int option_value;
int option_len;
#else
int option_value;
unsigned int option_len;
#endif
option_len = sizeof(option_value);
/* SOL_TCP IPPROTO_TCP */
if (getsockopt(sck, IPPROTO_TCP, TCP_NODELAY, (char *)&option_value,
&option_len) == 0)
{
if (option_value == 0)
{
option_value = 1;
option_len = sizeof(option_value);
if (setsockopt(sck, IPPROTO_TCP, TCP_NODELAY, (char *)&option_value,
option_len) == 0)
{
ret = 0; /* success */
}
else
{
g_writeln("Error setting tcp_nodelay");
}
}
}
else
{
g_writeln("Error getting tcp_nodelay");
}
return ret;
}
/*****************************************************************************/
/*Returns 0 on success*/
int APP_CC
g_tcp_set_keepalive(int sck)
{
int ret = 1; /* error */
#if defined(_WIN32)
int option_value;
int option_len;
#else
int option_value;
unsigned int option_len;
#endif
option_len = sizeof(option_value);
/* SOL_TCP IPPROTO_TCP */
if (getsockopt(sck, SOL_SOCKET, SO_KEEPALIVE, (char *)&option_value,
&option_len) == 0)
{
if (option_value == 0)
{
option_value = 1;
option_len = sizeof(option_value);
if (setsockopt(sck, SOL_SOCKET, SO_KEEPALIVE, (char *)&option_value,
option_len) == 0)
{
ret = 0; /* success */
}
else
{
g_writeln("Error setting tcp_keepalive");
}
}
}
else
{
g_writeln("Error getting tcp_keepalive");
}
return ret;
}
/*****************************************************************************/
/* returns a newly created socket or -1 on error */
/* in win32 a socket is an unsigned int, in linux, its an int */
int APP_CC
g_tcp_socket(void)
{
int rv;
int option_value;
#if defined(_WIN32)
int option_len;
#else
unsigned int option_len;
#endif
#if 0 && !defined(NO_ARPA_INET_H_IP6)
rv = (int)socket(AF_INET6, SOCK_STREAM, 0);
#else
rv = (int)socket(AF_INET, SOCK_STREAM, 0);
#endif
if (rv < 0)
{
return -1;
}
#if 0 && !defined(NO_ARPA_INET_H_IP6)
option_len = sizeof(option_value);
if (getsockopt(rv, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&option_value,
&option_len) == 0)
{
if (option_value != 0)
{
option_value = 0;
option_len = sizeof(option_value);
setsockopt(rv, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&option_value,
option_len);
}
}
#endif
option_len = sizeof(option_value);
if (getsockopt(rv, SOL_SOCKET, SO_REUSEADDR, (char *)&option_value,
&option_len) == 0)
{
if (option_value == 0)
{
option_value = 1;
option_len = sizeof(option_value);
setsockopt(rv, SOL_SOCKET, SO_REUSEADDR, (char *)&option_value,
option_len);
}
}
option_len = sizeof(option_value);
if (getsockopt(rv, SOL_SOCKET, SO_SNDBUF, (char *)&option_value,
&option_len) == 0)
{
if (option_value < (1024 * 32))
{
option_value = 1024 * 32;
option_len = sizeof(option_value);
setsockopt(rv, SOL_SOCKET, SO_SNDBUF, (char *)&option_value,
option_len);
}
}
return rv;
}
/*****************************************************************************/
int APP_CC
g_tcp_local_socket(void)
{
#if defined(_WIN32)
return 0;
#else
return socket(PF_LOCAL, SOCK_STREAM, 0);
#endif
}
/*****************************************************************************/
void APP_CC
g_tcp_close(int sck)
{
char ip[256];
if (sck == 0)
{
return;
}
#if defined(_WIN32)
closesocket(sck);
#else
g_write_ip_address(sck, ip, 255);
log_message(LOG_LEVEL_INFO, "An established connection closed to "
"endpoint: %s", ip);
close(sck);
#endif
}
/*****************************************************************************/
/* returns error, zero is good */
#if 0
int APP_CC
g_tcp_connect(int sck, const char *address, const char *port)
{
int res = 0;
struct addrinfo p;
struct addrinfo *h = (struct addrinfo *)NULL;
struct addrinfo *rp = (struct addrinfo *)NULL;
/* initialize (zero out) local variables: */
g_memset(&p, 0, sizeof(struct addrinfo));
/* in IPv6-enabled environments, set the AI_V4MAPPED
* flag in ai_flags and specify ai_family=AF_INET6 in
* order to ensure that getaddrinfo() returns any
* available IPv4-mapped addresses in case the target
* host does not have a true IPv6 address:
*/
p.ai_socktype = SOCK_STREAM;
p.ai_protocol = IPPROTO_TCP;
#if !defined(NO_ARPA_INET_H_IP6)
p.ai_flags = AI_ADDRCONFIG | AI_V4MAPPED;
p.ai_family = AF_INET6;
if (g_strcmp(address, "127.0.0.1") == 0)
{
res = getaddrinfo("::1", port, &p, &h);
}
else
{
res = getaddrinfo(address, port, &p, &h);
}
#else
p.ai_flags = AI_ADDRCONFIG;
p.ai_family = AF_INET;
res = getaddrinfo(address, port, &p, &h);
#endif
if (res > -1)
{
if (h != NULL)
{
for (rp = h; rp != NULL; rp = rp->ai_next)
{
rp = h;
res = connect(sck, (struct sockaddr *)(rp->ai_addr),
rp->ai_addrlen);
if (res != -1)
{
break; /* Success */
}
}
}
}
return res;
}
#else
int APP_CC
g_tcp_connect(int sck, const char* address, const char* port)
{
struct sockaddr_in s;
struct hostent* h;
g_memset(&s, 0, sizeof(struct sockaddr_in));
s.sin_family = AF_INET;
s.sin_port = htons((tui16)atoi(port));
s.sin_addr.s_addr = inet_addr(address);
if (s.sin_addr.s_addr == INADDR_NONE)
{
h = gethostbyname(address);
if (h != 0)
{
if (h->h_name != 0)
{
if (h->h_addr_list != 0)
{
if ((*(h->h_addr_list)) != 0)
{
s.sin_addr.s_addr = *((int*)(*(h->h_addr_list)));
}
}
}
}
}
return connect(sck, (struct sockaddr*)&s, sizeof(struct sockaddr_in));
}
#endif
/*****************************************************************************/
/* returns error, zero is good */
int APP_CC
g_tcp_local_connect(int sck, const char *port)
{
#if defined(_WIN32)
return -1;
#else
struct sockaddr_un s;
memset(&s, 0, sizeof(struct sockaddr_un));
s.sun_family = AF_UNIX;
strcpy(s.sun_path, port);
return connect(sck, (struct sockaddr *)&s, sizeof(struct sockaddr_un));
#endif
}
/*****************************************************************************/
int APP_CC
g_tcp_set_non_blocking(int sck)
{
unsigned long i;
#if defined(_WIN32)
i = 1;
ioctlsocket(sck, FIONBIO, &i);
#else
i = fcntl(sck, F_GETFL);
i = i | O_NONBLOCK;
fcntl(sck, F_SETFL, i);
#endif
return 0;
}
#if 0
/*****************************************************************************/
/* return boolean */
static int APP_CC
address_match(const char *address, struct addrinfo *j)
{
struct sockaddr_in *ipv4_in;
struct sockaddr_in6 *ipv6_in;
if (address == 0)
{
return 1;
}
if (address[0] == 0)
{
return 1;
}
if (g_strcmp(address, "0.0.0.0") == 0)
{
return 1;
}
if ((g_strcmp(address, "127.0.0.1") == 0) ||
(g_strcmp(address, "::1") == 0) ||
(g_strcmp(address, "localhost") == 0))
{
if (j->ai_addr != 0)
{
if (j->ai_addr->sa_family == AF_INET)
{
ipv4_in = (struct sockaddr_in *) (j->ai_addr);
if (inet_pton(AF_INET, "127.0.0.1", &(ipv4_in->sin_addr)))
{
return 1;
}
}
if (j->ai_addr->sa_family == AF_INET6)
{
ipv6_in = (struct sockaddr_in6 *) (j->ai_addr);
if (inet_pton(AF_INET6, "::1", &(ipv6_in->sin6_addr)))
{
return 1;
}
}
}
}
if (j->ai_addr != 0)
{
if (j->ai_addr->sa_family == AF_INET)
{
ipv4_in = (struct sockaddr_in *) (j->ai_addr);
if (inet_pton(AF_INET, address, &(ipv4_in->sin_addr)))
{
return 1;
}
}
if (j->ai_addr->sa_family == AF_INET6)
{
ipv6_in = (struct sockaddr_in6 *) (j->ai_addr);
if (inet_pton(AF_INET6, address, &(ipv6_in->sin6_addr)))
{
return 1;
}
}
}
return 0;
}
#endif
#if 0
/*****************************************************************************/
/* returns error, zero is good */
static int APP_CC
g_tcp_bind_flags(int sck, const char *port, const char *address, int flags)
{
int res;
int error;
struct addrinfo hints;
struct addrinfo *i;
res = -1;
g_memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_flags = flags;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
error = getaddrinfo(NULL, port, &hints, &i);
if (error == 0)
{
while ((i != 0) && (res < 0))
{
if (address_match(address, i))
{
res = bind(sck, i->ai_addr, i->ai_addrlen);
}
i = i->ai_next;
}
}
return res;
}
/*****************************************************************************/
/* returns error, zero is good */
int APP_CC
g_tcp_bind(int sck, const char *port)
{
int flags;
flags = AI_ADDRCONFIG | AI_PASSIVE;
return g_tcp_bind_flags(sck, port, 0, flags);
}
#else
int APP_CC
g_tcp_bind(int sck, const char* port)
{
struct sockaddr_in s;
memset(&s, 0, sizeof(struct sockaddr_in));
s.sin_family = AF_INET;
s.sin_port = htons((tui16)atoi(port));
s.sin_addr.s_addr = INADDR_ANY;
return bind(sck, (struct sockaddr*)&s, sizeof(struct sockaddr_in));
}
#endif
/*****************************************************************************/
int APP_CC
g_tcp_local_bind(int sck, const char *port)
{
#if defined(_WIN32)
return -1;
#else
struct sockaddr_un s;
memset(&s, 0, sizeof(struct sockaddr_un));
s.sun_family = AF_UNIX;
strcpy(s.sun_path, port);
return bind(sck, (struct sockaddr *)&s, sizeof(struct sockaddr_un));
#endif
}
#if 0
/*****************************************************************************/
/* returns error, zero is good */
int APP_CC
g_tcp_bind_address(int sck, const char *port, const char *address)
{
int flags;
flags = AI_ADDRCONFIG | AI_PASSIVE;
return g_tcp_bind_flags(sck, port, address, flags);
}
#else
int APP_CC
g_tcp_bind_address(int sck, const char* port, const char* address)
{
struct sockaddr_in s;
memset(&s, 0, sizeof(struct sockaddr_in));
s.sin_family = AF_INET;
s.sin_port = htons((tui16)atoi(port));
s.sin_addr.s_addr = INADDR_ANY;
if (inet_aton(address, &s.sin_addr) < 0)
{
return -1; /* bad address */
}
return bind(sck, (struct sockaddr*)&s, sizeof(struct sockaddr_in));
}
#endif
/*****************************************************************************/
/* returns error, zero is good */
int APP_CC
g_tcp_listen(int sck)
{
return listen(sck, 2);
}
/*****************************************************************************/
int APP_CC
g_tcp_accept(int sck)
{
int ret ;
char ipAddr[256] ;
struct sockaddr_in s;
#if defined(_WIN32)
signed int i;
#else
unsigned int i;
#endif
i = sizeof(struct sockaddr_in);
memset(&s, 0, i);
ret = accept(sck, (struct sockaddr *)&s, &i);
if(ret>0)
{
snprintf(ipAddr,255,"A connection received from: %s port %d"
,inet_ntoa(s.sin_addr),ntohs(s.sin_port));
log_message(LOG_LEVEL_INFO,ipAddr);
}
return ret ;
}
/*****************************************************************************/
void APP_CC
g_write_ip_address(int rcv_sck, char *ip_address, int bytes)
{
struct sockaddr_in s;
struct in_addr in;
#if defined(_WIN32)
int len;
#else
unsigned int len;
#endif
int ip_port;
int ok;
ok = 0;
memset(&s, 0, sizeof(s));
len = sizeof(s);
if (getpeername(rcv_sck, (struct sockaddr *)&s, &len) == 0)
{
memset(&in, 0, sizeof(in));
in.s_addr = s.sin_addr.s_addr;
ip_port = ntohs(s.sin_port);
if (ip_port != 0)
{
ok = 1;
snprintf(ip_address, bytes, "%s:%d - socket: %d", inet_ntoa(in),
ip_port, rcv_sck);
}
}
if (!ok)
{
snprintf(ip_address, bytes, "NULL:NULL - socket: %d", rcv_sck);
}
}
/*****************************************************************************/
void APP_CC
g_sleep(int msecs)
{
#if defined(_WIN32)
Sleep(msecs);
#else
usleep(msecs * 1000);
#endif
}
/*****************************************************************************/
int APP_CC
g_tcp_last_error_would_block(int sck)
{
#if defined(_WIN32)
return WSAGetLastError() == WSAEWOULDBLOCK;
#else
return (errno == EWOULDBLOCK) || (errno == EAGAIN) || (errno == EINPROGRESS);
#endif
}
/*****************************************************************************/
int APP_CC
g_tcp_recv(int sck, void *ptr, int len, int flags)
{
#if defined(_WIN32)
return recv(sck, (char *)ptr, len, flags);
#else
return recv(sck, ptr, len, flags);
#endif
}
/*****************************************************************************/
int APP_CC
g_tcp_send(int sck, const void *ptr, int len, int flags)
{
#if defined(_WIN32)
return send(sck, (const char *)ptr, len, flags);
#else
return send(sck, ptr, len, flags);
#endif
}
/*****************************************************************************/
/* returns boolean */
int APP_CC
g_tcp_socket_ok(int sck)
{
#if defined(_WIN32)
int opt;
int opt_len;
#else
int opt;
unsigned int opt_len;
#endif
opt_len = sizeof(opt);
if (getsockopt(sck, SOL_SOCKET, SO_ERROR, (char *)(&opt), &opt_len) == 0)
{
if (opt == 0)
{
return 1;
}
}
return 0;
}
/*****************************************************************************/
/* wait 'millis' milliseconds for the socket to be able to write */
/* returns boolean */
int APP_CC
g_tcp_can_send(int sck, int millis)
{
fd_set wfds;
struct timeval time;
int rv;
time.tv_sec = millis / 1000;
time.tv_usec = (millis * 1000) % 1000000;
FD_ZERO(&wfds);
if (sck > 0)
{
FD_SET(((unsigned int)sck), &wfds);
rv = select(sck + 1, 0, &wfds, 0, &time);
if (rv > 0)
{
return g_tcp_socket_ok(sck);
}
}
return 0;
}
/*****************************************************************************/
/* wait 'millis' milliseconds for the socket to be able to receive */
/* returns boolean */
int APP_CC
g_tcp_can_recv(int sck, int millis)
{
fd_set rfds;
struct timeval time;
int rv;
time.tv_sec = millis / 1000;
time.tv_usec = (millis * 1000) % 1000000;
FD_ZERO(&rfds);
if (sck > 0)