seamlessrdp-branch/rdesktop/rdesktop.c

/*
   rdesktop: A Remote Desktop Protocol client.
   Entrypoint and utility functions
   Copyright (C) Matthew Chapman 1999-2002

   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 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 <stdarg.h>             /* va_list va_start va_end */
#include <unistd.h>             /* read close getuid getgid getpid getppid gethostname */
#include <fcntl.h>              /* open */
#include <pwd.h>                /* getpwuid */
#include <limits.h>             /* PATH_MAX */
#include <termios.h>            /* tcgetattr tcsetattr */
#include <sys/stat.h>           /* stat */
#include <sys/time.h>           /* gettimeofday */
#include <sys/times.h>          /* times */
#include "rdesktop.h"

#ifdef EGD_SOCKET
#include <sys/socket.h>         /* socket connect */
#include <sys/un.h>             /* sockaddr_un */
#endif

#ifdef WITH_OPENSSL
#include <openssl/md5.h>
#else
#include "crypto/md5.h"
#endif

char title[32] = "";
char username[16];
char hostname[16];
char keymapname[16];
int keylayout = 0x409;          /* Defaults to US keyboard layout */
int width = 800;                /* If width or height are reset to zero, the geometry will 
                                   be fetched from _NET_WORKAREA */
int height = 600;
int tcp_port_rdp = TCP_PORT_RDP;
BOOL bitmap_compression = True;
BOOL sendmotion = True;
BOOL orders = True;
BOOL encryption = True;
BOOL desktop_save = True;
BOOL fullscreen = False;
BOOL grab_keyboard = True;
BOOL hide_decorations = False;

/* Display usage information */
static void
usage(char *program)
{
        fprintf(stderr, "rdesktop: A Remote Desktop Protocol client.\n");
        fprintf(stderr, "Version " VERSION ". Copyright (C) 1999-2002 Matt Chapman.\n");
        fprintf(stderr, "See http://www.rdesktop.org/ for more information.\n\n");

        fprintf(stderr, "Usage: %s [options] server[:port]\n", program);
        fprintf(stderr, "   -u: user name\n");
        fprintf(stderr, "   -d: domain\n");
        fprintf(stderr, "   -s: shell\n");
        fprintf(stderr, "   -c: working directory\n");
        fprintf(stderr, "   -p: password (- to prompt)\n");
        fprintf(stderr, "   -n: client hostname\n");
        fprintf(stderr, "   -k: keyboard layout on terminal server (us,sv,gr,etc.)\n");
        fprintf(stderr, "   -g: desktop geometry (WxH)\n");
        fprintf(stderr, "   -f: full-screen mode\n");
        fprintf(stderr, "   -b: force bitmap updates\n");
        fprintf(stderr, "   -e: disable encryption (French TS)\n");
        fprintf(stderr, "   -m: do not send motion events\n");
        fprintf(stderr, "   -K: keep window manager key bindings\n");
        fprintf(stderr, "   -T: window title\n");
        fprintf(stderr, "   -D: hide window manager decorations\n");
}

static BOOL
read_password(char *password, int size)
{
        struct termios tios;
        BOOL ret = False;
        int istty = 0;
        char *p;

        if (tcgetattr(STDIN_FILENO, &tios) == 0)
        {
                fprintf(stderr, "Password: ");
                tios.c_lflag &= ~ECHO;
                tcsetattr(STDIN_FILENO, TCSANOW, &tios);
                istty = 1;
        }

        if (fgets(password, size, stdin) != NULL)
        {
                ret = True;

                /* strip final newline */
                p = strchr(password, '\n');
                if (p != NULL)
                        *p = 0;
        }

        if (istty)
        {
                tios.c_lflag |= ECHO;
                tcsetattr(STDIN_FILENO, TCSANOW, &tios);
                fprintf(stderr, "\n");
        }

        return ret;
}

/* Client program */
int
main(int argc, char *argv[])
{
        char server[64];
        char fullhostname[64];
        char domain[16];
        char password[16];
        char shell[128];
        char directory[32];
        BOOL prompt_password;
        struct passwd *pw;
        uint32 flags;
        char *p;
        int c;

        flags = RDP_LOGON_NORMAL;
        prompt_password = False;
        domain[0] = password[0] = shell[0] = directory[0] = 0;
        strcpy(keymapname, "en-us");

        while ((c = getopt(argc, argv, "u:d:s:c:p:n:k:g:fbemKT:Dh?")) != -1)
        {
                switch (c)
                {
                        case 'u':
                                STRNCPY(username, optarg, sizeof(username));
                                break;

                        case 'd':
                                STRNCPY(domain, optarg, sizeof(domain));
                                break;

                        case 's':
                                STRNCPY(shell, optarg, sizeof(shell));
                                break;

                        case 'c':
                                STRNCPY(directory, optarg, sizeof(directory));
                                break;

                        case 'p':
                                if ((optarg[0] == '-') && (optarg[1] == 0))
                                {
                                        prompt_password = True;
                                        break;
                                }

                                STRNCPY(password, optarg, sizeof(password));
                                flags |= RDP_LOGON_AUTO;

                                /* try to overwrite argument so it won't appear in ps */
                                p = optarg;
                                while (*p)
                                        *(p++) = 'X';
                                break;

                        case 'n':
                                STRNCPY(hostname, optarg, sizeof(hostname));
                                break;

                        case 'k':
                                STRNCPY(keymapname, optarg, sizeof(keymapname));
                                break;

                        case 'g':
                                if (!strcmp(optarg, "workarea"))
                                {
                                        width = height = 0;
                                        break;
                                }

                                width = strtol(optarg, &p, 10);
                                if (*p == 'x')
                                        height = strtol(p + 1, NULL, 10);

                                if ((width == 0) || (height == 0))
                                {
                                        error("invalid geometry\n");
                                        return 1;
                                }
                                break;

                        case 'f':
                                fullscreen = True;
                                break;

                        case 'b':
                                orders = False;
                                break;

                        case 'e':
                                encryption = False;
                                break;

                        case 'm':
                                sendmotion = False;
                                break;

                        case 'K':
                                grab_keyboard = False;
                                break;

                        case 'T':
                                STRNCPY(title, optarg, sizeof(title));
                                break;

                        case 'D':
                                hide_decorations = True;
                                break;

                        case 'h':
                        case '?':
                        default:
                                usage(argv[0]);
                                return 1;
                }
        }

        if (argc - optind < 1)
        {
                usage(argv[0]);
                return 1;
        }

        STRNCPY(server, argv[optind], sizeof(server));
        p = strchr(server, ':');
        if (p != NULL)
        {
                tcp_port_rdp = strtol(p + 1, NULL, 10);
                *p = 0;
        }

        if (username[0] == 0)
        {
                pw = getpwuid(getuid());
                if ((pw == NULL) || (pw->pw_name == NULL))
                {
                        error("could not determine username, use -u\n");
                        return 1;
                }

                STRNCPY(username, pw->pw_name, sizeof(username));
        }

        if (hostname[0] == 0)
        {
                if (gethostname(fullhostname, sizeof(fullhostname)) == -1)
                {
                        error("could not determine local hostname, use -n\n");
                        return 1;
                }

                p = strchr(fullhostname, '.');
                if (p != NULL)
                        *p = 0;

                STRNCPY(hostname, fullhostname, sizeof(hostname));
        }

        if (prompt_password && read_password(password, sizeof(password)))
                flags |= RDP_LOGON_AUTO;

        if (title[0] == 0)
        {
                strcpy(title, "rdesktop - ");
                strncat(title, server, sizeof(title) - sizeof("rdesktop - "));
        }

        if (!ui_init())
                return 1;

        if (!rdp_connect(server, flags, domain, password, shell, directory))
                return 1;

        DEBUG(("Connection successful.\n"));
        memset(password, 0, sizeof(password));

        if (ui_create_window())
        {
                rdp_main_loop();
                ui_destroy_window();
        }

        DEBUG(("Disconnecting...\n"));
        rdp_disconnect();
        ui_deinit();
        return 0;
}

#ifdef EGD_SOCKET
/* Read 32 random bytes from PRNGD or EGD socket (based on OpenSSL RAND_egd) */
static BOOL
generate_random_egd(uint8 * buf)
{
        struct sockaddr_un addr;
        BOOL ret = False;
        int fd;

        fd = socket(AF_UNIX, SOCK_STREAM, 0);
        if (fd == -1)
                return False;

        addr.sun_family = AF_UNIX;
        memcpy(addr.sun_path, EGD_SOCKET, sizeof(EGD_SOCKET));
        if (connect(fd, (struct sockaddr *) &addr, sizeof(addr)) == -1)
                goto err;

        /* PRNGD and EGD use a simple communications protocol */
        buf[0] = 1;             /* Non-blocking (similar to /dev/urandom) */
        buf[1] = 32;            /* Number of requested random bytes */
        if (write(fd, buf, 2) != 2)
                goto err;

        if ((read(fd, buf, 1) != 1) || (buf[0] == 0))   /* Available? */
                goto err;

        if (read(fd, buf, 32) != 32)
                goto err;

        ret = True;

      err:
        close(fd);
        return ret;
}
#endif

/* Generate a 32-byte random for the secure transport code. */
void
generate_random(uint8 * random)
{
        struct stat st;
        struct tms tmsbuf;
        MD5_CTX md5;
        uint32 *r;
        int fd, n;

        /* If we have a kernel random device, try that first */
        if (((fd = open("/dev/urandom", O_RDONLY)) != -1)
            || ((fd = open("/dev/random", O_RDONLY)) != -1))
        {
                n = read(fd, random, 32);
                close(fd);
                if (n == 32)
                        return;
        }

#ifdef EGD_SOCKET
        /* As a second preference use an EGD */
        if (generate_random_egd(random))
                return;
#endif

        /* Otherwise use whatever entropy we can gather - ideas welcome. */
        r = (uint32 *) random;
        r[0] = (getpid()) | (getppid() << 16);
        r[1] = (getuid()) | (getgid() << 16);
        r[2] = times(&tmsbuf);  /* system uptime (clocks) */
        gettimeofday((struct timeval *) &r[3], NULL);   /* sec and usec */
        stat("/tmp", &st);
        r[5] = st.st_atime;
        r[6] = st.st_mtime;
        r[7] = st.st_ctime;

        /* Hash both halves with MD5 to obscure possible patterns */
        MD5_Init(&md5);
        MD5_Update(&md5, random, 16);
        MD5_Final(random, &md5);
        MD5_Update(&md5, random + 16, 16);
        MD5_Final(random + 16, &md5);
}

/* malloc; exit if out of memory */
void *
xmalloc(int size)
{
        void *mem = malloc(size);
        if (mem == NULL)
        {
                error("xmalloc %d\n", size);
                exit(1);
        }
        return mem;
}

/* realloc; exit if out of memory */
void *
xrealloc(void *oldmem, int size)
{
        void *mem = realloc(oldmem, size);
        if (mem == NULL)
        {
                error("xrealloc %d\n", size);
                exit(1);
        }
        return mem;
}

/* free */
void
xfree(void *mem)
{
        free(mem);
}

/* report an error */
void
error(char *format, ...)
{
        va_list ap;

        fprintf(stderr, "ERROR: ");

        va_start(ap, format);
        vfprintf(stderr, format, ap);
        va_end(ap);
}

/* report an unimplemented protocol feature */
void
unimpl(char *format, ...)
{
        va_list ap;

        fprintf(stderr, "NOT IMPLEMENTED: ");

        va_start(ap, format);
        vfprintf(stderr, format, ap);
        va_end(ap);
}

/* produce a hex dump */
void
hexdump(unsigned char *p, unsigned int len)
{
        unsigned char *line = p;
        unsigned int thisline, offset = 0;
        int i;

        while (offset < len)
        {
                printf("%04x ", offset);
                thisline = len - offset;
                if (thisline > 16)
                        thisline = 16;

                for (i = 0; i < thisline; i++)
                        printf("%02x ", line[i]);

                for (; i < 16; i++)
                        printf("   ");

                for (i = 0; i < thisline; i++)
                        printf("%c", (line[i] >= 0x20 && line[i] < 0x7f) ? line[i] : '.');

                printf("\n");
                offset += thisline;
                line += thisline;
        }
}

#ifdef SAVE_LICENCE
int
load_licence(unsigned char **data)
{
        char path[PATH_MAX];
        char *home;
        struct stat st;
        int fd;

        home = getenv("HOME");
        if (home == NULL)
                return -1;

        STRNCPY(path, home, sizeof(path));
        strncat(path, "/.rdesktop/licence", sizeof(path) - strlen(path) - 1);

        fd = open(path, O_RDONLY);
        if (fd == -1)
                return -1;

        if (fstat(fd, &st))
                return -1;

        *data = xmalloc(st.st_size);
        return read(fd, *data, st.st_size);
}

void
save_licence(unsigned char *data, int length)
{
        char path[PATH_MAX];
        char *home;
        int fd;

        home = getenv("HOME");
        if (home == NULL)
                return;

        STRNCPY(path, home, sizeof(path));
        strncat(path, "/.rdesktop", sizeof(path) - strlen(path) - 1);
        mkdir(path, 0700);

        strncat(path, "/licence", sizeof(path) - strlen(path) - 1);

        fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0600);
        if (fd == -1)
        {
                perror("open");
                return;
        }

        write(fd, data, length);
        close(fd);
}
#endif
1	/*
2	rdesktop: A Remote Desktop Protocol client.
3	Entrypoint and utility functions
4	Copyright (C) Matthew Chapman 1999-2002
5
6	This program is free software; you can redistribute it and/or modify
7	it under the terms of the GNU General Public License as published by
8	the Free Software Foundation; either version 2 of the License, or
9	(at your option) any later version.
10
11	This program is distributed in the hope that it will be useful,
12	but WITHOUT ANY WARRANTY; without even the implied warranty of
13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	GNU General Public License for more details.
15
16	You should have received a copy of the GNU General Public License
17	along with this program; if not, write to the Free Software
18	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19	*/
20
21	#include <stdarg.h> /* va_list va_start va_end */
22	#include <unistd.h> /* read close getuid getgid getpid getppid gethostname */
23	#include <fcntl.h> /* open */
24	#include <pwd.h> /* getpwuid */
25	#include <limits.h> /* PATH_MAX */
26	#include <termios.h> /* tcgetattr tcsetattr */
27	#include <sys/stat.h> /* stat */
28	#include <sys/time.h> /* gettimeofday */
29	#include <sys/times.h> /* times */
30	#include "rdesktop.h"
31
32	#ifdef EGD_SOCKET
33	#include <sys/socket.h> /* socket connect */
34	#include <sys/un.h> /* sockaddr_un */
35	#endif
36
37	#ifdef WITH_OPENSSL
38	#include <openssl/md5.h>
39	#else
40	#include "crypto/md5.h"
41	#endif
42
43	char title[32] = "";
44	char username[16];
45	char hostname[16];
46	char keymapname[16];
47	int keylayout = 0x409; /* Defaults to US keyboard layout */
48	int width = 800; /* If width or height are reset to zero, the geometry will
49	be fetched from _NET_WORKAREA */
50	int height = 600;
51	int tcp_port_rdp = TCP_PORT_RDP;
52	BOOL bitmap_compression = True;
53	BOOL sendmotion = True;
54	BOOL orders = True;
55	BOOL encryption = True;
56	BOOL desktop_save = True;
57	BOOL fullscreen = False;
58	BOOL grab_keyboard = True;
59	BOOL hide_decorations = False;
60
61	/* Display usage information */
62	static void
63	usage(char *program)
64	{
65	fprintf(stderr, "rdesktop: A Remote Desktop Protocol client.\n");
66	fprintf(stderr, "Version " VERSION ". Copyright (C) 1999-2002 Matt Chapman.\n");
67	fprintf(stderr, "See http://www.rdesktop.org/ for more information.\n\n");
68
69	fprintf(stderr, "Usage: %s [options] server[:port]\n", program);
70	fprintf(stderr, " -u: user name\n");
71	fprintf(stderr, " -d: domain\n");
72	fprintf(stderr, " -s: shell\n");
73	fprintf(stderr, " -c: working directory\n");
74	fprintf(stderr, " -p: password (- to prompt)\n");
75	fprintf(stderr, " -n: client hostname\n");
76	fprintf(stderr, " -k: keyboard layout on terminal server (us,sv,gr,etc.)\n");
77	fprintf(stderr, " -g: desktop geometry (WxH)\n");
78	fprintf(stderr, " -f: full-screen mode\n");
79	fprintf(stderr, " -b: force bitmap updates\n");
80	fprintf(stderr, " -e: disable encryption (French TS)\n");
81	fprintf(stderr, " -m: do not send motion events\n");
82	fprintf(stderr, " -K: keep window manager key bindings\n");
83	fprintf(stderr, " -T: window title\n");
84	fprintf(stderr, " -D: hide window manager decorations\n");
85	}
86
87	static BOOL
88	read_password(char *password, int size)
89	{
90	struct termios tios;
91	BOOL ret = False;
92	int istty = 0;
93	char *p;
94
95	if (tcgetattr(STDIN_FILENO, &tios) == 0)
96	{
97	fprintf(stderr, "Password: ");
98	tios.c_lflag &= ~ECHO;
99	tcsetattr(STDIN_FILENO, TCSANOW, &tios);
100	istty = 1;
101	}
102
103	if (fgets(password, size, stdin) != NULL)
104	{
105	ret = True;
106
107	/* strip final newline */
108	p = strchr(password, '\n');
109	if (p != NULL)
110	*p = 0;
111	}
112
113	if (istty)
114	{
115	tios.c_lflag \|= ECHO;
116	tcsetattr(STDIN_FILENO, TCSANOW, &tios);
117	fprintf(stderr, "\n");
118	}
119
120	return ret;
121	}
122
123	/* Client program */
124	int
125	main(int argc, char *argv[])
126	{
127	char server[64];
128	char fullhostname[64];
129	char domain[16];
130	char password[16];
131	char shell[128];
132	char directory[32];
133	BOOL prompt_password;
134	struct passwd *pw;
135	uint32 flags;
136	char *p;
137	int c;
138
139	flags = RDP_LOGON_NORMAL;
140	prompt_password = False;
141	domain[0] = password[0] = shell[0] = directory[0] = 0;
142	strcpy(keymapname, "en-us");
143
144	while ((c = getopt(argc, argv, "u:d:s:c:p:n:k:g:fbemKT:Dh?")) != -1)
145	{
146	switch (c)
147	{
148	case 'u':
149	STRNCPY(username, optarg, sizeof(username));
150	break;
151
152	case 'd':
153	STRNCPY(domain, optarg, sizeof(domain));
154	break;
155
156	case 's':
157	STRNCPY(shell, optarg, sizeof(shell));
158	break;
159
160	case 'c':
161	STRNCPY(directory, optarg, sizeof(directory));
162	break;
163
164	case 'p':
165	if ((optarg[0] == '-') && (optarg[1] == 0))
166	{
167	prompt_password = True;
168	break;
169	}
170
171	STRNCPY(password, optarg, sizeof(password));
172	flags \|= RDP_LOGON_AUTO;
173
174	/* try to overwrite argument so it won't appear in ps */
175	p = optarg;
176	while (*p)
177	*(p++) = 'X';
178	break;
179
180	case 'n':
181	STRNCPY(hostname, optarg, sizeof(hostname));
182	break;
183
184	case 'k':
185	STRNCPY(keymapname, optarg, sizeof(keymapname));
186	break;
187
188	case 'g':
189	if (!strcmp(optarg, "workarea"))
190	{
191	width = height = 0;
192	break;
193	}
194
195	width = strtol(optarg, &p, 10);
196	if (*p == 'x')
197	height = strtol(p + 1, NULL, 10);
198
199	if ((width == 0) \|\| (height == 0))
200	{
201	error("invalid geometry\n");
202	return 1;
203	}
204	break;
205
206	case 'f':
207	fullscreen = True;
208	break;
209
210	case 'b':
211	orders = False;
212	break;
213
214	case 'e':
215	encryption = False;
216	break;
217
218	case 'm':
219	sendmotion = False;
220	break;
221
222	case 'K':
223	grab_keyboard = False;
224	break;
225
226	case 'T':
227	STRNCPY(title, optarg, sizeof(title));
228	break;
229
230	case 'D':
231	hide_decorations = True;
232	break;
233
234	case 'h':
235	case '?':
236	default:
237	usage(argv[0]);
238	return 1;
239	}
240	}
241
242	if (argc - optind < 1)
243	{
244	usage(argv[0]);
245	return 1;
246	}
247
248	STRNCPY(server, argv[optind], sizeof(server));
249	p = strchr(server, ':');
250	if (p != NULL)
251	{
252	tcp_port_rdp = strtol(p + 1, NULL, 10);
253	*p = 0;
254	}
255
256	if (username[0] == 0)
257	{
258	pw = getpwuid(getuid());
259	if ((pw == NULL) \|\| (pw->pw_name == NULL))
260	{
261	error("could not determine username, use -u\n");
262	return 1;
263	}
264
265	STRNCPY(username, pw->pw_name, sizeof(username));
266	}
267
268	if (hostname[0] == 0)
269	{
270	if (gethostname(fullhostname, sizeof(fullhostname)) == -1)
271	{
272	error("could not determine local hostname, use -n\n");
273	return 1;
274	}
275
276	p = strchr(fullhostname, '.');
277	if (p != NULL)
278	*p = 0;
279
280	STRNCPY(hostname, fullhostname, sizeof(hostname));
281	}
282
283	if (prompt_password && read_password(password, sizeof(password)))
284	flags \|= RDP_LOGON_AUTO;
285
286	if (title[0] == 0)
287	{
288	strcpy(title, "rdesktop - ");
289	strncat(title, server, sizeof(title) - sizeof("rdesktop - "));
290	}
291
292	if (!ui_init())
293	return 1;
294
295	if (!rdp_connect(server, flags, domain, password, shell, directory))
296	return 1;
297
298	DEBUG(("Connection successful.\n"));
299	memset(password, 0, sizeof(password));
300
301	if (ui_create_window())
302	{
303	rdp_main_loop();
304	ui_destroy_window();
305	}
306
307	DEBUG(("Disconnecting...\n"));
308	rdp_disconnect();
309	ui_deinit();
310	return 0;
311	}
312
313	#ifdef EGD_SOCKET
314	/* Read 32 random bytes from PRNGD or EGD socket (based on OpenSSL RAND_egd) */
315	static BOOL
316	generate_random_egd(uint8 * buf)
317	{
318	struct sockaddr_un addr;
319	BOOL ret = False;
320	int fd;
321
322	fd = socket(AF_UNIX, SOCK_STREAM, 0);
323	if (fd == -1)
324	return False;
325
326	addr.sun_family = AF_UNIX;
327	memcpy(addr.sun_path, EGD_SOCKET, sizeof(EGD_SOCKET));
328	if (connect(fd, (struct sockaddr *) &addr, sizeof(addr)) == -1)
329	goto err;
330
331	/* PRNGD and EGD use a simple communications protocol */
332	buf[0] = 1; /* Non-blocking (similar to /dev/urandom) */
333	buf[1] = 32; /* Number of requested random bytes */
334	if (write(fd, buf, 2) != 2)
335	goto err;
336
337	if ((read(fd, buf, 1) != 1) \|\| (buf[0] == 0)) /* Available? */
338	goto err;
339
340	if (read(fd, buf, 32) != 32)
341	goto err;
342
343	ret = True;
344
345	err:
346	close(fd);
347	return ret;
348	}
349	#endif
350
351	/* Generate a 32-byte random for the secure transport code. */
352	void
353	generate_random(uint8 * random)
354	{
355	struct stat st;
356	struct tms tmsbuf;
357	MD5_CTX md5;
358	uint32 *r;
359	int fd, n;
360
361	/* If we have a kernel random device, try that first */
362	if (((fd = open("/dev/urandom", O_RDONLY)) != -1)
363	\|\| ((fd = open("/dev/random", O_RDONLY)) != -1))
364	{
365	n = read(fd, random, 32);
366	close(fd);
367	if (n == 32)
368	return;
369	}
370
371	#ifdef EGD_SOCKET
372	/* As a second preference use an EGD */
373	if (generate_random_egd(random))
374	return;
375	#endif
376
377	/* Otherwise use whatever entropy we can gather - ideas welcome. */
378	r = (uint32 *) random;
379	r[0] = (getpid()) \| (getppid() << 16);
380	r[1] = (getuid()) \| (getgid() << 16);
381	r[2] = times(&tmsbuf); /* system uptime (clocks) */
382	gettimeofday((struct timeval ) &r[3], NULL); / sec and usec */
383	stat("/tmp", &st);
384	r[5] = st.st_atime;
385	r[6] = st.st_mtime;
386	r[7] = st.st_ctime;
387
388	/* Hash both halves with MD5 to obscure possible patterns */
389	MD5_Init(&md5);
390	MD5_Update(&md5, random, 16);
391	MD5_Final(random, &md5);
392	MD5_Update(&md5, random + 16, 16);
393	MD5_Final(random + 16, &md5);
394	}
395
396	/* malloc; exit if out of memory */
397	void *
398	xmalloc(int size)
399	{
400	void *mem = malloc(size);
401	if (mem == NULL)
402	{
403	error("xmalloc %d\n", size);
404	exit(1);
405	}
406	return mem;
407	}
408
409	/* realloc; exit if out of memory */
410	void *
411	xrealloc(void *oldmem, int size)
412	{
413	void *mem = realloc(oldmem, size);
414	if (mem == NULL)
415	{
416	error("xrealloc %d\n", size);
417	exit(1);
418	}
419	return mem;
420	}
421
422	/* free */
423	void
424	xfree(void *mem)
425	{
426	free(mem);
427	}
428
429	/* report an error */
430	void
431	error(char *format, ...)
432	{
433	va_list ap;
434
435	fprintf(stderr, "ERROR: ");
436
437	va_start(ap, format);
438	vfprintf(stderr, format, ap);
439	va_end(ap);
440	}
441
442	/* report an unimplemented protocol feature */
443	void
444	unimpl(char *format, ...)
445	{
446	va_list ap;
447
448	fprintf(stderr, "NOT IMPLEMENTED: ");
449
450	va_start(ap, format);
451	vfprintf(stderr, format, ap);
452	va_end(ap);
453	}
454
455	/* produce a hex dump */
456	void
457	hexdump(unsigned char *p, unsigned int len)
458	{
459	unsigned char *line = p;
460	unsigned int thisline, offset = 0;
461	int i;
462
463	while (offset < len)
464	{
465	printf("%04x ", offset);
466	thisline = len - offset;
467	if (thisline > 16)
468	thisline = 16;
469
470	for (i = 0; i < thisline; i++)
471	printf("%02x ", line[i]);
472
473	for (; i < 16; i++)
474	printf(" ");
475
476	for (i = 0; i < thisline; i++)
477	printf("%c", (line[i] >= 0x20 && line[i] < 0x7f) ? line[i] : '.');
478
479	printf("\n");
480	offset += thisline;
481	line += thisline;
482	}
483	}
484
485	#ifdef SAVE_LICENCE
486	int
487	load_licence(unsigned char **data)
488	{
489	char path[PATH_MAX];
490	char *home;
491	struct stat st;
492	int fd;
493
494	home = getenv("HOME");
495	if (home == NULL)
496	return -1;
497
498	STRNCPY(path, home, sizeof(path));
499	strncat(path, "/.rdesktop/licence", sizeof(path) - strlen(path) - 1);
500
501	fd = open(path, O_RDONLY);
502	if (fd == -1)
503	return -1;
504
505	if (fstat(fd, &st))
506	return -1;
507
508	*data = xmalloc(st.st_size);
509	return read(fd, *data, st.st_size);
510	}
511
512	void
513	save_licence(unsigned char *data, int length)
514	{
515	char path[PATH_MAX];
516	char *home;
517	int fd;
518
519	home = getenv("HOME");
520	if (home == NULL)
521	return;
522
523	STRNCPY(path, home, sizeof(path));
524	strncat(path, "/.rdesktop", sizeof(path) - strlen(path) - 1);
525	mkdir(path, 0700);
526
527	strncat(path, "/licence", sizeof(path) - strlen(path) - 1);
528
529	fd = open(path, O_WRONLY \| O_CREAT \| O_TRUNC, 0600);
530	if (fd == -1)
531	{
532	perror("open");
533	return;
534	}
535
536	write(fd, data, length);
537	close(fd);
538	}
539	#endif