trunk/rdesktop/rdesktop.c

/*
   rdesktop: A Remote Desktop Protocol client.
   Entrypoint and utility functions
   Copyright (C) Matthew Chapman 1999-2003

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <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 <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;
int server_bpp = 8;
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;
extern BOOL owncolmap;

/* Display usage information */
static void
usage(char *program)
{
        fprintf(stderr, "rdesktop: A Remote Desktop Protocol client.\n");
        fprintf(stderr, "Version " VERSION ". Copyright (C) 1999-2003 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, "   -C: use private colour map\n");
        fprintf(stderr, "   -K: keep window manager key bindings\n");
        fprintf(stderr, "   -T: window title\n");
        fprintf(stderr, "   -D: hide window manager decorations\n");
        fprintf(stderr, "   -a: server bpp\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;
        int username_option = 0;

        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:a:fbemCKT:Dh?")) != -1)
        {
                switch (c)
                {
                        case 'u':
                                STRNCPY(username, optarg, sizeof(username));
                                username_option = 1;
                                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 'C':
                                owncolmap = True;
                                break;

                        case 'K':
                                grab_keyboard = False;
                                break;

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

                        case 'D':
                                hide_decorations = True;
                                break;

                        case 'a':
                                server_bpp = strtol(optarg, NULL, 10);
                                if (server_bpp != 8 && server_bpp != 16 && server_bpp != 15
                                    && server_bpp != 24)
                                {
                                        error("invalid server bpp\n");
                                        return 1;
                                }
                                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_option)
        {
                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 a warning */
void
warning(char *format, ...)
{
        va_list ap;

        fprintf(stderr, "WARNING: ");

        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;
        }
}
1	/*
2	rdesktop: A Remote Desktop Protocol client.
3	Entrypoint and utility functions
4	Copyright (C) Matthew Chapman 1999-2003
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 <termios.h> /* tcgetattr tcsetattr */
26	#include <sys/stat.h> /* stat */
27	#include <sys/time.h> /* gettimeofday */
28	#include <sys/times.h> /* times */
29	#include "rdesktop.h"
30
31	#ifdef EGD_SOCKET
32	#include <sys/socket.h> /* socket connect */
33	#include <sys/un.h> /* sockaddr_un */
34	#endif
35
36	#ifdef WITH_OPENSSL
37	#include <openssl/md5.h>
38	#else
39	#include "crypto/md5.h"
40	#endif
41
42	char title[32] = "";
43	char username[16];
44	char hostname[16];
45	char keymapname[16];
46	int keylayout = 0x409; /* Defaults to US keyboard layout */
47	int width = 800; /* If width or height are reset to zero, the geometry will
48	be fetched from _NET_WORKAREA */
49	int height = 600;
50	int tcp_port_rdp = TCP_PORT_RDP;
51	int server_bpp = 8;
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	extern BOOL owncolmap;
61
62	/* Display usage information */
63	static void
64	usage(char *program)
65	{
66	fprintf(stderr, "rdesktop: A Remote Desktop Protocol client.\n");
67	fprintf(stderr, "Version " VERSION ". Copyright (C) 1999-2003 Matt Chapman.\n");
68	fprintf(stderr, "See http://www.rdesktop.org/ for more information.\n\n");
69
70	fprintf(stderr, "Usage: %s [options] server[:port]\n", program);
71	fprintf(stderr, " -u: user name\n");
72	fprintf(stderr, " -d: domain\n");
73	fprintf(stderr, " -s: shell\n");
74	fprintf(stderr, " -c: working directory\n");
75	fprintf(stderr, " -p: password (- to prompt)\n");
76	fprintf(stderr, " -n: client hostname\n");
77	fprintf(stderr, " -k: keyboard layout on terminal server (us,sv,gr,etc.)\n");
78	fprintf(stderr, " -g: desktop geometry (WxH)\n");
79	fprintf(stderr, " -f: full-screen mode\n");
80	fprintf(stderr, " -b: force bitmap updates\n");
81	fprintf(stderr, " -e: disable encryption (French TS)\n");
82	fprintf(stderr, " -m: do not send motion events\n");
83	fprintf(stderr, " -C: use private colour map\n");
84	fprintf(stderr, " -K: keep window manager key bindings\n");
85	fprintf(stderr, " -T: window title\n");
86	fprintf(stderr, " -D: hide window manager decorations\n");
87	fprintf(stderr, " -a: server bpp\n");
88	}
89
90	static BOOL
91	read_password(char *password, int size)
92	{
93	struct termios tios;
94	BOOL ret = False;
95	int istty = 0;
96	char *p;
97
98	if (tcgetattr(STDIN_FILENO, &tios) == 0)
99	{
100	fprintf(stderr, "Password: ");
101	tios.c_lflag &= ~ECHO;
102	tcsetattr(STDIN_FILENO, TCSANOW, &tios);
103	istty = 1;
104	}
105
106	if (fgets(password, size, stdin) != NULL)
107	{
108	ret = True;
109
110	/* strip final newline */
111	p = strchr(password, '\n');
112	if (p != NULL)
113	*p = 0;
114	}
115
116	if (istty)
117	{
118	tios.c_lflag \|= ECHO;
119	tcsetattr(STDIN_FILENO, TCSANOW, &tios);
120	fprintf(stderr, "\n");
121	}
122
123	return ret;
124	}
125
126	/* Client program */
127	int
128	main(int argc, char *argv[])
129	{
130	char server[64];
131	char fullhostname[64];
132	char domain[16];
133	char password[16];
134	char shell[128];
135	char directory[32];
136	BOOL prompt_password;
137	struct passwd *pw;
138	uint32 flags;
139	char *p;
140	int c;
141	int username_option = 0;
142
143	flags = RDP_LOGON_NORMAL;
144	prompt_password = False;
145	domain[0] = password[0] = shell[0] = directory[0] = 0;
146	strcpy(keymapname, "en-us");
147
148	while ((c = getopt(argc, argv, "u:d:s:c:p:n:k:g:a:fbemCKT:Dh?")) != -1)
149	{
150	switch (c)
151	{
152	case 'u':
153	STRNCPY(username, optarg, sizeof(username));
154	username_option = 1;
155	break;
156
157	case 'd':
158	STRNCPY(domain, optarg, sizeof(domain));
159	break;
160
161	case 's':
162	STRNCPY(shell, optarg, sizeof(shell));
163	break;
164
165	case 'c':
166	STRNCPY(directory, optarg, sizeof(directory));
167	break;
168
169	case 'p':
170	if ((optarg[0] == '-') && (optarg[1] == 0))
171	{
172	prompt_password = True;
173	break;
174	}
175
176	STRNCPY(password, optarg, sizeof(password));
177	flags \|= RDP_LOGON_AUTO;
178
179	/* try to overwrite argument so it won't appear in ps */
180	p = optarg;
181	while (*p)
182	*(p++) = 'X';
183	break;
184
185	case 'n':
186	STRNCPY(hostname, optarg, sizeof(hostname));
187	break;
188
189	case 'k':
190	STRNCPY(keymapname, optarg, sizeof(keymapname));
191	break;
192
193	case 'g':
194	if (!strcmp(optarg, "workarea"))
195	{
196	width = height = 0;
197	break;
198	}
199
200	width = strtol(optarg, &p, 10);
201	if (*p == 'x')
202	height = strtol(p + 1, NULL, 10);
203
204	if ((width == 0) \|\| (height == 0))
205	{
206	error("invalid geometry\n");
207	return 1;
208	}
209	break;
210
211	case 'f':
212	fullscreen = True;
213	break;
214
215	case 'b':
216	orders = False;
217	break;
218
219	case 'e':
220	encryption = False;
221	break;
222
223	case 'm':
224	sendmotion = False;
225	break;
226
227	case 'C':
228	owncolmap = True;
229	break;
230
231	case 'K':
232	grab_keyboard = False;
233	break;
234
235	case 'T':
236	STRNCPY(title, optarg, sizeof(title));
237	break;
238
239	case 'D':
240	hide_decorations = True;
241	break;
242
243	case 'a':
244	server_bpp = strtol(optarg, NULL, 10);
245	if (server_bpp != 8 && server_bpp != 16 && server_bpp != 15
246	&& server_bpp != 24)
247	{
248	error("invalid server bpp\n");
249	return 1;
250	}
251	break;
252
253	case 'h':
254	case '?':
255	default:
256	usage(argv[0]);
257	return 1;
258	}
259	}
260
261	if (argc - optind < 1)
262	{
263	usage(argv[0]);
264	return 1;
265	}
266
267	STRNCPY(server, argv[optind], sizeof(server));
268	p = strchr(server, ':');
269	if (p != NULL)
270	{
271	tcp_port_rdp = strtol(p + 1, NULL, 10);
272	*p = 0;
273	}
274
275	if (!username_option)
276	{
277	pw = getpwuid(getuid());
278	if ((pw == NULL) \|\| (pw->pw_name == NULL))
279	{
280	error("could not determine username, use -u\n");
281	return 1;
282	}
283
284	STRNCPY(username, pw->pw_name, sizeof(username));
285	}
286
287	if (hostname[0] == 0)
288	{
289	if (gethostname(fullhostname, sizeof(fullhostname)) == -1)
290	{
291	error("could not determine local hostname, use -n\n");
292	return 1;
293	}
294
295	p = strchr(fullhostname, '.');
296	if (p != NULL)
297	*p = 0;
298
299	STRNCPY(hostname, fullhostname, sizeof(hostname));
300	}
301
302	if (prompt_password && read_password(password, sizeof(password)))
303	flags \|= RDP_LOGON_AUTO;
304
305	if (title[0] == 0)
306	{
307	strcpy(title, "rdesktop - ");
308	strncat(title, server, sizeof(title) - sizeof("rdesktop - "));
309	}
310
311	if (!ui_init())
312	return 1;
313
314	if (!rdp_connect(server, flags, domain, password, shell, directory))
315	return 1;
316
317	DEBUG(("Connection successful.\n"));
318	memset(password, 0, sizeof(password));
319
320	if (ui_create_window())
321	{
322	rdp_main_loop();
323	ui_destroy_window();
324	}
325
326	DEBUG(("Disconnecting...\n"));
327	rdp_disconnect();
328	ui_deinit();
329	return 0;
330	}
331
332	#ifdef EGD_SOCKET
333	/* Read 32 random bytes from PRNGD or EGD socket (based on OpenSSL RAND_egd) */
334	static BOOL
335	generate_random_egd(uint8 * buf)
336	{
337	struct sockaddr_un addr;
338	BOOL ret = False;
339	int fd;
340
341	fd = socket(AF_UNIX, SOCK_STREAM, 0);
342	if (fd == -1)
343	return False;
344
345	addr.sun_family = AF_UNIX;
346	memcpy(addr.sun_path, EGD_SOCKET, sizeof(EGD_SOCKET));
347	if (connect(fd, (struct sockaddr *) &addr, sizeof(addr)) == -1)
348	goto err;
349
350	/* PRNGD and EGD use a simple communications protocol */
351	buf[0] = 1; /* Non-blocking (similar to /dev/urandom) */
352	buf[1] = 32; /* Number of requested random bytes */
353	if (write(fd, buf, 2) != 2)
354	goto err;
355
356	if ((read(fd, buf, 1) != 1) \|\| (buf[0] == 0)) /* Available? */
357	goto err;
358
359	if (read(fd, buf, 32) != 32)
360	goto err;
361
362	ret = True;
363
364	err:
365	close(fd);
366	return ret;
367	}
368	#endif
369
370	/* Generate a 32-byte random for the secure transport code. */
371	void
372	generate_random(uint8 * random)
373	{
374	struct stat st;
375	struct tms tmsbuf;
376	MD5_CTX md5;
377	uint32 *r;
378	int fd, n;
379
380	/* If we have a kernel random device, try that first */
381	if (((fd = open("/dev/urandom", O_RDONLY)) != -1)
382	\|\| ((fd = open("/dev/random", O_RDONLY)) != -1))
383	{
384	n = read(fd, random, 32);
385	close(fd);
386	if (n == 32)
387	return;
388	}
389
390	#ifdef EGD_SOCKET
391	/* As a second preference use an EGD */
392	if (generate_random_egd(random))
393	return;
394	#endif
395
396	/* Otherwise use whatever entropy we can gather - ideas welcome. */
397	r = (uint32 *) random;
398	r[0] = (getpid()) \| (getppid() << 16);
399	r[1] = (getuid()) \| (getgid() << 16);
400	r[2] = times(&tmsbuf); /* system uptime (clocks) */
401	gettimeofday((struct timeval ) &r[3], NULL); / sec and usec */
402	stat("/tmp", &st);
403	r[5] = st.st_atime;
404	r[6] = st.st_mtime;
405	r[7] = st.st_ctime;
406
407	/* Hash both halves with MD5 to obscure possible patterns */
408	MD5_Init(&md5);
409	MD5_Update(&md5, random, 16);
410	MD5_Final(random, &md5);
411	MD5_Update(&md5, random + 16, 16);
412	MD5_Final(random + 16, &md5);
413	}
414
415	/* malloc; exit if out of memory */
416	void *
417	xmalloc(int size)
418	{
419	void *mem = malloc(size);
420	if (mem == NULL)
421	{
422	error("xmalloc %d\n", size);
423	exit(1);
424	}
425	return mem;
426	}
427
428	/* realloc; exit if out of memory */
429	void *
430	xrealloc(void *oldmem, int size)
431	{
432	void *mem = realloc(oldmem, size);
433	if (mem == NULL)
434	{
435	error("xrealloc %d\n", size);
436	exit(1);
437	}
438	return mem;
439	}
440
441	/* free */
442	void
443	xfree(void *mem)
444	{
445	free(mem);
446	}
447
448	/* report an error */
449	void
450	error(char *format, ...)
451	{
452	va_list ap;
453
454	fprintf(stderr, "ERROR: ");
455
456	va_start(ap, format);
457	vfprintf(stderr, format, ap);
458	va_end(ap);
459	}
460
461	/* report a warning */
462	void
463	warning(char *format, ...)
464	{
465	va_list ap;
466
467	fprintf(stderr, "WARNING: ");
468
469	va_start(ap, format);
470	vfprintf(stderr, format, ap);
471	va_end(ap);
472	}
473
474	/* report an unimplemented protocol feature */
475	void
476	unimpl(char *format, ...)
477	{
478	va_list ap;
479
480	fprintf(stderr, "NOT IMPLEMENTED: ");
481
482	va_start(ap, format);
483	vfprintf(stderr, format, ap);
484	va_end(ap);
485	}
486
487	/* produce a hex dump */
488	void
489	hexdump(unsigned char *p, unsigned int len)
490	{
491	unsigned char *line = p;
492	unsigned int thisline, offset = 0;
493	int i;
494
495	while (offset < len)
496	{
497	printf("%04x ", offset);
498	thisline = len - offset;
499	if (thisline > 16)
500	thisline = 16;
501
502	for (i = 0; i < thisline; i++)
503	printf("%02x ", line[i]);
504
505	for (; i < 16; i++)
506	printf(" ");
507
508	for (i = 0; i < thisline; i++)
509	printf("%c", (line[i] >= 0x20 && line[i] < 0x7f) ? line[i] : '.');
510
511	printf("\n");
512	offset += thisline;
513	line += thisline;
514	}
515	}