trunk/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;
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;

/* 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");
}

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, "us");

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