ReactOS 0.4.16-dev-106-g10b08aa
Functions
parser.c File Reference
#include <headers.h>
#include <datatypes.h>
#include <display.h>
#include <parser.h>
#include <leases.h>
#include <options.h>
Include dependency graph for parser.c:

Go to the source code of this file.

Functions

int parse_dhcp_options (DHCPMESSAGE *dhcpm, DHCPOPTIONS *dhcpo)
 
int process_dhcp_packet (DHCPMESSAGE *dhcpm, DHCPOPTIONS *dhcpo)
 
int write_packet (DHCPMESSAGE *dhcpm, char *name)
 

Function Documentation

◆ parse_dhcp_options()

int parse_dhcp_options ( DHCPMESSAGE *  dhcpm,
DHCPOPTIONS *  dhcpo 
)

Definition at line 8 of file parser.c.

9{
10 int pointer, opointer;
11 int olength;
12
13 pointer = 0;
14
15 fprintf( stdout, "parse_dhcp_options [begin]!\n");
16
17 /* Options Initialization */
18 /* No message type */
19 dhcpo->type = 0;
20 /* No ip address, 0.0.0.0 */
21 dhcpo->r_ip = 0;
22 /* No mask address, 0.0.0.0 */
23 dhcpo->r_mask = 0;
24 /* No router, 0.0.0.0 */
25 dhcpo->r_router = 0;
26 /* No lease 0 */
27 dhcpo->r_lease = 0;
28 /* No name '\n' */
29 dhcpo->hostname = NULL;
30
31 while( pointer< 312 )
32 {
33 if(( dhcpm->options[0] != 99 ) && (dhcpm->options[1]!=130) && (dhcpm->options[2]!=83) && (dhcpm->options[3]!= 99))
34 {
35 fprintf( stdout, "No magic cookie! Aborting! \n" );
36 return -1;
37 }
38 switch( dhcpm->options[pointer] ){
39 case PAD:
40 pointer++;
41 break;
42 case MESSAGETYPE:
43 /* Try to figure out the kind of message and start the configuring process */
44 pointer += 2;
45 dhcpo->type = dhcpm->options[pointer++];
46 break;
47 case PREQUEST:
48 /* Take note of the requested parameters */
49 opointer = pointer + 2;
50 olength = pointer + dhcpm->options[pointer + 1];
51 while( opointer < olength )
52 {
53 switch( dhcpm->options[opointer] ){
54 case IP:
55 /* Take note of the requested ip */
56 opointer += 2;
57 dhcpo->r_ip += dhcpm->options[opointer++];
58 dhcpo->r_ip = dhcpo->r_ip << 8;
59 dhcpo->r_ip += dhcpm->options[opointer++];
60 dhcpo->r_ip = dhcpo->r_ip << 8;
61 dhcpo->r_ip += dhcpm->options[opointer++];
62 dhcpo->r_ip = dhcpo->r_ip << 8;
63 dhcpo->r_ip += dhcpm->options[opointer++];
64 break;
65 case MASK:
66 /* Take note of the requested mask */
67 opointer += 2;
68 dhcpo->r_mask += dhcpm->options[opointer++];
69 dhcpo->r_mask = dhcpo->r_ip << 8;
70 dhcpo->r_mask += dhcpm->options[opointer++];
71 dhcpo->r_mask = dhcpo->r_ip << 8;
72 dhcpo->r_mask += dhcpm->options[opointer++];
73 dhcpo->r_mask = dhcpo->r_ip << 8;
74 dhcpo->r_mask += dhcpm->options[opointer++];
75 break;
76 case ROUTER:
77 /* Take note of the requested router */
78 opointer += 2;
79 dhcpo->r_router += dhcpm->options[opointer++];
80 dhcpo->r_router = dhcpo->r_ip << 8;
81 dhcpo->r_router += dhcpm->options[opointer++];
82 dhcpo->r_router = dhcpo->r_ip << 8;
83 dhcpo->r_router += dhcpm->options[opointer++];
84 dhcpo->r_router = dhcpo->r_ip << 8;
85 dhcpo->r_router += dhcpm->options[opointer++];
86 break;
87 case LEASE:
88 opointer += 2;
89 dhcpo->r_lease += dhcpm->options[opointer++];
90 dhcpo->r_lease = dhcpo->r_ip << 8;
91 dhcpo->r_lease += dhcpm->options[opointer++];
92 dhcpo->r_lease = dhcpo->r_ip << 8;
93 dhcpo->r_lease += dhcpm->options[opointer++];
94 dhcpo->r_lease = dhcpo->r_ip << 8;
95 dhcpo->r_lease += dhcpm->options[opointer++];
96 break;
97 case HOSTNAME:
98 opointer += 1;
99 dhcpo->hostname = (char *)malloc( dhcpm->options[opointer] + 1);
100 strncpy( dhcpo->hostname, &dhcpm->options[opointer+1], dhcpm->options[opointer] );
101 opointer += dhcpm->options[opointer] + 1;
102 default:
103 /* Ignore option */
104 opointer++;
105 break;
106 }
107 }
108 pointer = opointer;
109 break;
110 case TOFFSET:
111 case TIMESERVER:
112 case NS:
113 case DNS:
114 case LOGSERVER:
115 case COOKIESERVER:
116 case LPRSERVER:
117 case IMPSERVER:
118 case RESLOCSERVER:
119 case BOOTFILESIZE:
120 case MERITDUMPFILE:
121 case DOMAINNAME:
122 case SWAPSERVER:
123 case ROOTPATH:
124 case EXTENSIONPATH:
125 case IPFORWARD:
126 case NONLOCAL:
127 case POLICYFILTER:
128 case MAXIMUMDATAG:
129 case DEFAULTTTL:
130 case PATHMTUATO:
131 case PATHMTUPTO:
132 case IMTU:
133 case ALLSUBLOCAL:
134 case BROADCAST:
135 case PMASKDISCOVERY:
136 case MASKSUPPLIER:
137 case PROUTERDISCOVE:
138 case RSOLICIADDRESS:
139 case STATICROUTE:
140 case TENCAPSULATION:
141 case ARPCACHE:
142 case ETHENCAPSUL:
143 case TCPDEFTTL:
144 case TCPKAI:
145 case TCPKAG:
146 case NISDOMAIN:
147 case NISSERVER:
148 case NTPSERVER:
149 case VENDORSP:
150 case NBTCPIPNS:
151 case NBTCPIPDDS:
152 case NBTCPIPNT:
153 case NBTCPIPSC:
154 case XWINFONTSERVER:
155 case XWINDISPLAY:
156 case OVERLOAD:
157 case SERVER:
158 case MESSAGE:
159 case MAXIMUMDHCP:
160 case RENEWALTIME:
161 case REBINDING:
162 case VENDORCLASS:
163 case NISPLUSDOMAIN:
164 case NISPLUSSERVER:
165 case TFTPSERVER:
166 case BOOTFILE:
167 case MOBILEIP:
168 case SMTPSERVER:
169 case POP3SERVER:
170 case NNTPSERVER:
171 case HTTPSERVER:
172 case FINGERSERVER:
173 case IRCSERVER:
174 case STREETTALKSE:
175 case STREETTALKDA:
176 case CLIENT:
177 pointer++;
178 pointer += dhcpm->options[pointer];
179 case END:
180 /* return to the calling functions because this is over */
181 fprintf( stdout, "parse_dhcp_options: END option found! [end]!\n");
182 return 0;
183 default:
184 /* ignored */
185 pointer++;
186 break;
187 }
188 }
189 fprintf( stdout, "parse_dhcp_options [end]!\n");
190 return 0;
191}
strncpy
char * strncpy(char *DstString, const char *SrcString, ACPI_SIZE Count)
Definition: utclib.c:427
TOFFSET
#define TOFFSET
Definition: auth_time.c:74
malloc
#define malloc
Definition: debug_ros.c:4
NULL
#define NULL
Definition: types.h:112
IP
#define IP
Definition: ftp_var.h:24
pointer
GLsizei const GLvoid * pointer
Definition: glext.h:5848
stdout
#define stdout
Definition: stdio.h:99
fprintf
_Check_return_opt_ _CRTIMP int __cdecl fprintf(_Inout_ FILE *_File, _In_z_ _Printf_format_string_ const char *_Format,...)
PREQUEST
#define PREQUEST
Definition: options.h:85
NS
#define NS
Definition: options.h:35
DEFAULTTTL
#define DEFAULTTTL
Definition: options.h:53
IMPSERVER
#define IMPSERVER
Definition: options.h:40
PROUTERDISCOVE
#define PROUTERDISCOVE
Definition: options.h:61
BOOTFILE
#define BOOTFILE
Definition: options.h:95
IMTU
#define IMTU
Definition: options.h:56
TENCAPSULATION
#define TENCAPSULATION
Definition: options.h:64
LPRSERVER
#define LPRSERVER
Definition: options.h:39
SERVER
#define SERVER
Definition: options.h:84
NONLOCAL
#define NONLOCAL
Definition: options.h:50
END
#define END
Definition: options.h:105
BOOTFILESIZE
#define BOOTFILESIZE
Definition: options.h:43
PATHMTUATO
#define PATHMTUATO
Definition: options.h:54
NISSERVER
#define NISSERVER
Definition: options.h:71
VENDORCLASS
#define VENDORCLASS
Definition: options.h:90
PAD
#define PAD
Definition: options.h:30
OVERLOAD
#define OVERLOAD
Definition: options.h:82
IRCSERVER
#define IRCSERVER
Definition: options.h:102
SMTPSERVER
#define SMTPSERVER
Definition: options.h:97
XWINDISPLAY
#define XWINDISPLAY
Definition: options.h:79
MERITDUMPFILE
#define MERITDUMPFILE
Definition: options.h:44
EXTENSIONPATH
#define EXTENSIONPATH
Definition: options.h:48
ROUTER
#define ROUTER
Definition: options.h:33
DOMAINNAME
#define DOMAINNAME
Definition: options.h:45
HOSTNAME
#define HOSTNAME
Definition: options.h:42
NISPLUSDOMAIN
#define NISPLUSDOMAIN
Definition: options.h:92
NTPSERVER
#define NTPSERVER
Definition: options.h:72
STREETTALKDA
#define STREETTALKDA
Definition: options.h:104
TCPKAG
#define TCPKAG
Definition: options.h:69
TFTPSERVER
#define TFTPSERVER
Definition: options.h:94
STREETTALKSE
#define STREETTALKSE
Definition: options.h:103
MAXIMUMDHCP
#define MAXIMUMDHCP
Definition: options.h:87
LOGSERVER
#define LOGSERVER
Definition: options.h:37
RSOLICIADDRESS
#define RSOLICIADDRESS
Definition: options.h:62
NBTCPIPNS
#define NBTCPIPNS
Definition: options.h:74
XWINFONTSERVER
#define XWINFONTSERVER
Definition: options.h:78
ROOTPATH
#define ROOTPATH
Definition: options.h:47
ALLSUBLOCAL
#define ALLSUBLOCAL
Definition: options.h:57
POLICYFILTER
#define POLICYFILTER
Definition: options.h:51
ETHENCAPSUL
#define ETHENCAPSUL
Definition: options.h:66
IPFORWARD
#define IPFORWARD
Definition: options.h:49
PMASKDISCOVERY
#define PMASKDISCOVERY
Definition: options.h:59
LEASE
#define LEASE
Definition: options.h:81
SWAPSERVER
#define SWAPSERVER
Definition: options.h:46
RESLOCSERVER
#define RESLOCSERVER
Definition: options.h:41
POP3SERVER
#define POP3SERVER
Definition: options.h:98
TCPDEFTTL
#define TCPDEFTTL
Definition: options.h:67
RENEWALTIME
#define RENEWALTIME
Definition: options.h:88
REBINDING
#define REBINDING
Definition: options.h:89
PATHMTUPTO
#define PATHMTUPTO
Definition: options.h:55
TIMESERVER
#define TIMESERVER
Definition: options.h:34
MAXIMUMDATAG
#define MAXIMUMDATAG
Definition: options.h:52
STATICROUTE
#define STATICROUTE
Definition: options.h:63
BROADCAST
#define BROADCAST
Definition: options.h:58
FINGERSERVER
#define FINGERSERVER
Definition: options.h:101
TCPKAI
#define TCPKAI
Definition: options.h:68
VENDORSP
#define VENDORSP
Definition: options.h:73
NNTPSERVER
#define NNTPSERVER
Definition: options.h:99
DNS
#define DNS
Definition: options.h:36
NBTCPIPNT
#define NBTCPIPNT
Definition: options.h:76
NBTCPIPDDS
#define NBTCPIPDDS
Definition: options.h:75
NISDOMAIN
#define NISDOMAIN
Definition: options.h:70
ARPCACHE
#define ARPCACHE
Definition: options.h:65
HTTPSERVER
#define HTTPSERVER
Definition: options.h:100
NBTCPIPSC
#define NBTCPIPSC
Definition: options.h:77
MESSAGETYPE
#define MESSAGETYPE
Definition: options.h:83
MASK
#define MASK
Definition: options.h:31
MOBILEIP
#define MOBILEIP
Definition: options.h:96
CLIENT
#define CLIENT
Definition: options.h:91
NISPLUSSERVER
#define NISPLUSSERVER
Definition: options.h:93
MASKSUPPLIER
#define MASKSUPPLIER
Definition: options.h:60
MESSAGE
#define MESSAGE
Definition: options.h:86
COOKIESERVER
#define COOKIESERVER
Definition: options.h:38
DHCPMESSAGE::options
u8b options[312]
Definition: datatypes.h:23
DHCPOPTIONS::r_ip
u32b r_ip
Definition: datatypes.h:28
DHCPOPTIONS::r_mask
u32b r_mask
Definition: datatypes.h:29
DHCPOPTIONS::r_router
u32b r_router
Definition: datatypes.h:30
DHCPOPTIONS::hostname
char * hostname
Definition: datatypes.h:32
DHCPOPTIONS::r_lease
u32b r_lease
Definition: datatypes.h:31

Referenced by main().

◆ process_dhcp_packet()

int process_dhcp_packet ( DHCPMESSAGE *  dhcpm,
DHCPOPTIONS *  dhcpo 
)

Definition at line 193 of file parser.c.

194{
195 int pointer = 4;
196 DHCPLEASE dhcpl;
197 char *name;
198
199 fprintf( stdout, "process_dhcp_packet [begin]!\n");
200
201 if( (!dhcpm) || (!dhcpo) )
202 return -1;
203
204 name = (char *)malloc( 16 );
205 switch( dhcpo->type ){
206
207 case DHCPDISCOVER:
208 /* We need to send a DHCPOFFER */
209 if( find_lease( &dhcpl, dhcpm->xid, dhcpm->chaddr ) < 0 )
210 {
211 fprintf( stdout, "No free leases! \n" );
212 free( name );
213 return -1;
214 }
215 dhcpm->op = BOOTREPLY;
216 dhcpm->yiaddr = dhcpl.ip;
217 dhcpm->siaddr = dhcpl.siaddr;
218 strcpy(dhcpm->sname, VERSION);
219 dhcpm->options[pointer++] = MESSAGETYPE;
220 dhcpm->options[pointer++] = 1;
221 dhcpm->options[pointer++] = DHCPOFFER;
222 dhcpm->options[pointer++] = ROUTER;
223 dhcpm->options[pointer++] = 4;
224 dhcpm->options[pointer++] = (dhcpl.router & 0xFF);
225 dhcpm->options[pointer++] = ((dhcpl.router >> 8) & 0xFF);
226 dhcpm->options[pointer++] = ((dhcpl.router >> 16) &0xFF);
227 dhcpm->options[pointer++] = (dhcpl.router >> 24);
228 dhcpm->options[pointer++] = MASK;
229 dhcpm->options[pointer++] = 4;
230 dhcpm->options[pointer++] = (dhcpl.mask & 0xFF);
231 dhcpm->options[pointer++] = ((dhcpl.mask >> 8) & 0xFF);
232 dhcpm->options[pointer++] = ((dhcpl.mask >> 16) & 0xFF);
233 dhcpm->options[pointer++] = (dhcpl.mask >> 24);
234 dhcpm->options[pointer++] = SERVER;
235 dhcpm->options[pointer++] = 4;
236 dhcpm->options[pointer++] = (dhcpl.siaddr & 0xFF);
237 dhcpm->options[pointer++] = ((dhcpl.siaddr >> 8) & 0xFF);
238 dhcpm->options[pointer++] = ((dhcpl.siaddr >> 16) & 0xFF);
239 dhcpm->options[pointer++] = (dhcpl.siaddr >> 24);
240 dhcpm->options[pointer++] = LEASE;
241 dhcpm->options[pointer++] = 4;
242 dhcpm->options[pointer++] = (dhcpl.lease >> 24);
243 dhcpm->options[pointer++] = ((dhcpl.lease >> 16) & 0xFF);
244 dhcpm->options[pointer++] = ((dhcpl.lease >> 8) & 0xFF);
245 dhcpm->options[pointer++] = (dhcpl.lease & 0xFF);
246 dhcpm->options[pointer++] = REBINDING;
247 dhcpm->options[pointer++] = 4;
248 dhcpm->options[pointer++] = (dhcpl.lease >> 24);
249 dhcpm->options[pointer++] = ((dhcpl.lease >> 16) & 0xFF);
250 dhcpm->options[pointer++] = ((dhcpl.lease >> 8) & 0xFF);
251 dhcpm->options[pointer++] = (dhcpl.lease & 0xFF) - 5;
252 dhcpm->options[pointer++] = RENEWALTIME;
253 dhcpm->options[pointer++] = 4;
254 dhcpm->options[pointer++] = (dhcpl.lease >> 24);
255 dhcpm->options[pointer++] = ((dhcpl.lease >> 16) & 0xFF);
256 dhcpm->options[pointer++] = ((dhcpl.lease >> 8) & 0xFF);
257 dhcpm->options[pointer++] = (dhcpl.lease & 0xFF) - 5;
258 dhcpm->options[pointer++] = PAD;
259 dhcpm->options[pointer++] = PAD;
260 dhcpm->options[pointer++] = PAD;
261 dhcpm->options[pointer++] = END;
262 for( ; pointer < 312; pointer++ )
263 dhcpm->options[pointer] = PAD;
264 dhcpo->type = DHCPOFFER;
265 strcpy( name, "255.255.255.255" );
266 break;
267
268 case DHCPREQUEST:
269 /* We need to send an DHCPACK */
270 dhcpm->op = BOOTREPLY;
271 dhcpm->yiaddr = dhcpm->ciaddr;
272 strcpy(dhcpm->sname, VERSION);
273 if( confirm_lease( &dhcpl, dhcpm->xid ) < 0)
274 {
275 dhcpm->options[pointer++] = MESSAGETYPE;
276 dhcpm->options[pointer++] = 1;
277 dhcpm->options[pointer++] = DHCPNAK;
278 dhcpm->options[pointer++] = PAD;
279 dhcpm->options[pointer++] = END;
280 for( ; pointer < 312; pointer++ )
281 dhcpm->options[pointer] = PAD;
282 sprintf( name, "%u.%u.%u.%u", (dhcpm->ciaddr &0xFF), ((dhcpm->ciaddr>>8)&0xFF), ((dhcpm->ciaddr>>16)&0xFF), ((dhcpm->ciaddr>>24)&0xFF));
283 display_dhcp_packet( dhcpm, dhcpo );
284 write_packet( dhcpm, name );
285 free( name );
286 return -1;
287 }
288 dhcpm->siaddr = dhcpl.siaddr;
289 dhcpm->options[pointer++] = MESSAGETYPE;
290 dhcpm->options[pointer++] = 1;
291 dhcpm->options[pointer++] = DHCPACK;
292 dhcpm->options[pointer++] = ROUTER;
293 dhcpm->options[pointer++] = 4;
294 dhcpm->options[pointer++] = (dhcpl.router >> 24);
295 dhcpm->options[pointer++] = ((dhcpl.router >> 16) & 0xFF);
296 dhcpm->options[pointer++] = ((dhcpl.router >> 8) &0xFF);
297 dhcpm->options[pointer++] = (dhcpl.router & 0xFF);
298 dhcpm->options[pointer++] = MASK;
299 dhcpm->options[pointer++] = 4;
300 dhcpm->options[pointer++] = (dhcpl.mask >> 24);
301 dhcpm->options[pointer++] = ((dhcpl.mask >> 16) & 0xFF);
302 dhcpm->options[pointer++] = ((dhcpl.mask >> 8) & 0xFF);
303 dhcpm->options[pointer++] = (dhcpl.mask & 0xFF);
304 dhcpm->options[pointer++] = SERVER;
305 dhcpm->options[pointer++] = 4;
306 dhcpm->options[pointer++] = dhcpl.siaddr >> 24;
307 dhcpm->options[pointer++] = ((dhcpl.siaddr >> 16) & 0xFF);
308 dhcpm->options[pointer++] = ((dhcpl.siaddr >> 8) & 0xFF);
309 dhcpm->options[pointer++] = (dhcpl.siaddr & 0xFF);
310 dhcpm->options[pointer++] = LEASE;
311 dhcpm->options[pointer++] = 4;
312 dhcpm->options[pointer++] = (dhcpl.lease >> 24);
313 dhcpm->options[pointer++] = ((dhcpl.lease >> 16) & 0xFF);
314 dhcpm->options[pointer++] = ((dhcpl.lease >> 8) & 0xFF);
315 dhcpm->options[pointer++] = (dhcpl.lease & 0xFF);
316 dhcpm->options[pointer++] = REBINDING;
317 dhcpm->options[pointer++] = 4;
318 dhcpm->options[pointer++] = (dhcpl.lease >> 24);
319 dhcpm->options[pointer++] = ((dhcpl.lease >> 16) & 0xFF);
320 dhcpm->options[pointer++] = ((dhcpl.lease >> 8) & 0xFF);
321 dhcpm->options[pointer++] = (dhcpl.lease & 0xFF);
322 dhcpm->options[pointer++] = RENEWALTIME;
323 dhcpm->options[pointer++] = 4;
324 dhcpm->options[pointer++] = (dhcpl.lease >> 24);
325 dhcpm->options[pointer++] = ((dhcpl.lease >> 16) & 0xFF);
326 dhcpm->options[pointer++] = ((dhcpl.lease >> 8) & 0xFF);
327 dhcpm->options[pointer++] = (dhcpl.lease & 0xFF);
328 dhcpm->options[pointer++] = PAD;
329 dhcpm->options[pointer++] = PAD;
330 dhcpm->options[pointer++] = PAD;
331 dhcpm->options[pointer++] = END;
332 for( ; pointer < 312; pointer++ )
333 dhcpm->options[pointer] = PAD;
334 dhcpo->type = DHCPACK;
335 sprintf( name, "%u.%u.%u.%u", (dhcpl.ip & 0xFF), ((dhcpl.ip>>8) & 0xFF), ((dhcpl.ip>>16)&0xFF), (dhcpl.ip>>24));
336 break;
337
338 default:
339 break;
340 }
341 display_dhcp_packet( dhcpm, dhcpo );
342 write_packet( dhcpm, name );
343 fprintf( stdout, "process_dhcp_packet [end]!\n");
344 free( name );
345 return 0;
346}
strcpy
char * strcpy(char *DstString, const char *SrcString)
Definition: utclib.c:388
VERSION
#define VERSION
Definition: rdesktop.h:45
DHCPREQUEST
#define DHCPREQUEST
Definition: dhcp.h:164
DHCPNAK
#define DHCPNAK
Definition: dhcp.h:167
DHCPACK
#define DHCPACK
Definition: dhcp.h:166
BOOTREPLY
#define BOOTREPLY
Definition: dhcp.h:79
DHCPDISCOVER
#define DHCPDISCOVER
Definition: dhcp.h:162
DHCPOFFER
#define DHCPOFFER
Definition: dhcp.h:163
free
#define free
Definition: debug_ros.c:5
find_lease
int find_lease(DHCPLEASE *, u32b, u8b *)
confirm_lease
int confirm_lease(DHCPLEASE *, u32b)
Definition: leases.c:183
display_dhcp_packet
int display_dhcp_packet(DHCPMESSAGE *dhcpm, DHCPOPTIONS *dhcpo)
Definition: display.c:6
write_packet
int write_packet(DHCPMESSAGE *dhcpm, char *name)
Definition: parser.c:348
sprintf
#define sprintf(buf, format,...)
Definition: sprintf.c:55
DHCPLEASE::lease
u32b lease
Definition: datatypes.h:39
DHCPLEASE::siaddr
u32b siaddr
Definition: datatypes.h:40
DHCPLEASE::router
u32b router
Definition: datatypes.h:37
DHCPLEASE::ip
u32b ip
Definition: datatypes.h:36
DHCPLEASE::mask
u32b mask
Definition: datatypes.h:38
DHCPMESSAGE::yiaddr
u32b yiaddr
Definition: datatypes.h:17
DHCPMESSAGE::ciaddr
u32b ciaddr
Definition: datatypes.h:16
DHCPMESSAGE::siaddr
u32b siaddr
Definition: datatypes.h:18
DHCPMESSAGE::sname
u8b sname[64]
Definition: datatypes.h:21
DHCPMESSAGE::xid
u32b xid
Definition: datatypes.h:13
DHCPMESSAGE::chaddr
u8b chaddr[16]
Definition: datatypes.h:20
name
Definition: name.c:39

Referenced by main().

◆ write_packet()

int write_packet ( DHCPMESSAGE *  dhcpm,
char *  name 
)

Definition at line 348 of file parser.c.

349{
350 int sockfd;
351 struct sockaddr_in their_addr; // connector's address information
352 struct hostent *he;
353 int numbytes;
354 int enable = 1;
355
356 fprintf( stdout, "write_packet [begin]\n" );
357
358 if( !dhcpm )
359 return -1;
360
361 if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
362 perror("socket");
363 exit(1);
364 }
365
366 if( setsockopt( sockfd, SOL_SOCKET, SO_BROADCAST, &enable, sizeof( enable )) == -1 )
367 {
368 perror("setsockopt");
369 exit(1);
370 }
371
372 if( strcmp( "255.255.255.255", name ) )
373 {
374 if ((he=gethostbyname(name)) == NULL) { // get the host info
375 perror("gethostbyname");
376 fprintf( stdout, "Unknown host %s \n", name );
377 return -1;
378 }
379 their_addr.sin_family = AF_INET; // host byte order
380 their_addr.sin_port = htons(68); // short, network byte order
381 their_addr.sin_addr = *((struct in_addr *)he->h_addr);
382 } else {
383 their_addr.sin_family = AF_INET; // host byte order
384 their_addr.sin_port = htons(68); // short, network byte order
385 their_addr.sin_addr.s_addr = 0xFFFFFFFF;
386 }
387
388 fprintf( stdout, "IP a buscar: %s \n", name );
389 memset(&(their_addr.sin_zero), '\0', 8); // zero the rest of the struct
390
391 if ((numbytes=sendto(sockfd, dhcpm, sizeof(DHCPMESSAGE), 0,
392 (struct sockaddr *)&their_addr, sizeof(struct sockaddr))) == -1) {
393 perror("sendto");
394 exit(1);
395 }
396
397 printf("sent %d bytes to %s\n", numbytes,
398 inet_ntoa(their_addr.sin_addr));
399
400 close(sockfd);
401
402 fprintf( stdout, "write_packet [end]\n" );
403
404 return 0;
405}
strcmp
int strcmp(const char *String1, const char *String2)
Definition: utclib.c:469
close
#define close
Definition: acwin.h:98
sendto
INT WSAAPI sendto(IN SOCKET s, IN CONST CHAR FAR *buf, IN INT len, IN INT flags, IN CONST struct sockaddr *to, IN INT tolen)
Definition: send.c:82
AF_INET
#define AF_INET
Definition: tcpip.h:117
printf
#define printf
Definition: freeldr.h:97
gethostbyname
PHOSTENT WSAAPI gethostbyname(IN const char FAR *name)
Definition: getxbyxx.c:221
enable
GLboolean enable
Definition: glext.h:11120
perror
_CRTIMP void __cdecl perror(_In_opt_z_ const char *_ErrMsg)
inet_ntoa
#define inet_ntoa(addr)
Definition: inet.h:100
htons
#define htons(x)
Definition: module.h:215
exit
#define exit(n)
Definition: config.h:202
memset
#define memset(x, y, z)
Definition: compat.h:39
setsockopt
INT WSAAPI setsockopt(IN SOCKET s, IN INT level, IN INT optname, IN CONST CHAR FAR *optval, IN INT optlen)
Definition: sockctrl.c:421
socket
SOCKET WSAAPI socket(IN INT af, IN INT type, IN INT protocol)
Definition: socklife.c:143
in_addr
Definition: tcpip.h:126
sockaddr_in
Definition: winsock.h:509
SOCK_DGRAM
#define SOCK_DGRAM
Definition: winsock.h:336
SOL_SOCKET
#define SOL_SOCKET
Definition: winsock.h:398
SO_BROADCAST
#define SO_BROADCAST
Definition: winsock.h:183

Referenced by process_dhcp_packet().