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1
#include <sys/socket.h>
2
#include <sys/ioctl.h>
3
#include <sys/time.h>
4
5
#include <asm/types.h>

6
7
#include <math.h>

8
#include <string.h>

9
#include <stdio.h>

10
#include <stdlib.h>

11
#include <unistd.h>

12
#include <signal.h>

13
#include <arpa/inet.h>

14
15
#include <linux/if_packet.h>

16
#include <linux/if_ether.h>

17
#include <linux/if_arp.h>

18
19-
#define DEVICE "eth0"

19+
20
#define DEVICE "eth1"

21
#define ETH_P_NULL 0x0

22
#define ETH_MAC_LEN ETH_ALEN

23
#define	ETH_ARP 0x0806

24
25
int s = 0; /*Socketdescriptor*/

26
void* buffer = NULL;

27
long total_packets = 0;

28
long answered_packets = 0;

29
30
void sigint(int signum);

31
32
struct __attribute__((packed)) arp_header

33-
unsigned short arp_hd;

33+
34-
unsigned short arp_pr;

34+
	unsigned short arp_hd;

35-
unsigned char arp_hdl;

35+
	unsigned short arp_pr;

36-
unsigned char arp_prl;

36+
	unsigned char arp_hdl;

37-
unsigned short arp_op;

37+
	unsigned char arp_prl;

38-
unsigned char arp_sha[6];

38+
	unsigned short arp_op;

39-
unsigned char arp_spa[4];

39+
	unsigned char arp_sha[6];

40-
unsigned char arp_dha[6];

40+
	unsigned char arp_spa[4];

41-
unsigned char arp_dpa[4];

41+
	unsigned char arp_dha[6];

42
	unsigned char arp_dpa[4];

43
};

44-
buffer = (void*)malloc(BUF_SIZE); /*Buffer for Ethernet Frame*/

44+
45-
unsigned char* etherhead = buffer;	/*Pointer to Ethenet Header*/

45+
	buffer = (void*)malloc(BUF_SIZE); /*Buffer for Ethernet Frame*/

46-
struct ethhdr *eh = (struct ethhdr *)etherhead; /*Another pointer to

46+
	unsigned char* etherhead = buffer;	/*Pointer to Ethenet Header*/

47-
ethernet header*/

47+
	struct ethhdr *eh = (struct ethhdr *)etherhead; /*Another pointer to

48-
unsigned char* arphead = buffer + 14;

48+
	                                                  ethernet header*/

49-
struct arp_header *ah;

49+
	unsigned char* arphead = buffer + 14;

50-
unsigned char src_mac[6];	 /*our MAC address*/

50+
	struct arp_header *ah;

51
	unsigned char src_mac[6];	 /*our MAC address*/

52-
struct ifreq ifr;

52+
53-
struct sockaddr_ll socket_address;

53+
	struct ifreq ifr;

54-
int ifindex = 0;	 /*Ethernet Interface index*/

54+
	struct sockaddr_ll socket_address;

55-
int i;

55+
	int ifindex = 0;	 /*Ethernet Interface index*/

56-
int length;	 /*length of received packet*/

56+
	int i;

57-
int sent;

57+
	int length;	 /*length of received packet*/

58
	int sent;

59-
printf("Server started, entering initialiation phase...\n");

59+
60
	printf("Server started, entering initialiation phase...\n");

61-
/*open socket*/

61+
62-
s = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));

62+
	/*open socket*/

63-
if (s == -1) {

63+
	s = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));

64-
perror("socket():");

64+
	if (s == -1) {

65-
exit(1);

65+
		perror("socket():");

66
		exit(1);

67-
printf("Successfully opened socket: %i\n", s);

67+
	}

68
	printf("Successfully opened socket: %i\n", s);

69-
/*retrieve ethernet interface index*/

69+
70-
strncpy(ifr.ifr_name, DEVICE, IFNAMSIZ);

70+
	/*retrieve ethernet interface index*/

71-
if (ioctl(s, SIOCGIFINDEX, &ifr) == -1) {

71+
	strncpy(ifr.ifr_name, DEVICE, IFNAMSIZ);

72-
perror("SIOCGIFINDEX");

72+
	if (ioctl(s, SIOCGIFINDEX, &ifr) == -1) {

73-
exit(1);

73+
		perror("SIOCGIFINDEX");

74
		exit(1);

75-
ifindex = ifr.ifr_ifindex;

75+
	}

76-
printf("Successfully got interface index: %i\n", ifindex);

76+
	ifindex = ifr.ifr_ifindex;

77
	printf("Successfully got interface index: %i\n", ifindex);

78-
/*retrieve corresponding MAC*/

78+
79-
if (ioctl(s, SIOCGIFHWADDR, &ifr) == -1) {

79+
	/*retrieve corresponding MAC*/

80-
perror("SIOCGIFINDEX");

80+
	if (ioctl(s, SIOCGIFHWADDR, &ifr) == -1) {

81-
exit(1);

81+
		perror("SIOCGIFINDEX");

82
		exit(1);

83-
for (i = 0; i < 6; i++) {

83+
	}

84-
src_mac[i] = ifr.ifr_hwaddr.sa_data[i];

84+
	for (i = 0; i < 6; i++) {

85
		src_mac[i] = ifr.ifr_hwaddr.sa_data[i];

86-
printf("Successfully got our MAC address: %02X:%02X:%02X:%02X:%02X:%02X\n",

86+
	}

87-
src_mac[0],src_mac[1],src_mac[2],src_mac[3],src_mac[4],src_mac[5]);

87+
	printf("Successfully got our MAC address: %02X:%02X:%02X:%02X:%02X:%02X\n",

88
	       src_mac[0],src_mac[1],src_mac[2],src_mac[3],src_mac[4],src_mac[5]);

89-
/*prepare sockaddr_ll*/

89+
90-
socket_address.sll_family = PF_PACKET;

90+
	/*prepare sockaddr_ll*/

91-
socket_address.sll_protocol = htons(ETH_P_IP);

91+
	socket_address.sll_family = PF_PACKET;

92-
socket_address.sll_ifindex = ifindex;

92+
	socket_address.sll_protocol = htons(ETH_P_ARP);

93-
socket_address.sll_hatype = ARPHRD_ETHER;

93+
	socket_address.sll_ifindex = ifindex;

94-
socket_address.sll_pkttype = PACKET_OTHERHOST;

94+
	socket_address.sll_hatype = ARPHRD_ETHER;

95-
socket_address.sll_halen = 0;

95+
	socket_address.sll_pkttype = 0; //PACKET_OTHERHOST;

96-
socket_address.sll_addr[6] = 0x00;

96+
	socket_address.sll_halen = 0;

97-
socket_address.sll_addr[7] = 0x00;

97+
	socket_address.sll_addr[6] = 0x00;

98-
/*establish signal handler*/

98+
	socket_address.sll_addr[7] = 0x00;

99-
signal(SIGINT, sigint);

99+
	/*establish signal handler*/

100-
printf("Successfully established signal handler for SIGINT\n");

100+
	signal(SIGINT, sigint);

101-
printf("We are in production state, waiting for incoming packets....\n");

101+
	printf("Successfully established signal handler for SIGINT\n");

102
	printf("We are in production state, waiting for incoming packets....\n");

103-
while (1) {

103+
104-
/*Wait for incoming packet...*/

104+
	while (1) {

105-
length = recvfrom(s, buffer, BUF_SIZE, 0, NULL, NULL);

105+
		/*Wait for incoming packet...*/

106-
if (length == -1)

106+
		length = recvfrom(s, buffer, BUF_SIZE, 0, NULL, NULL);

107
		if (length == -1)

108-
perror("recvfrom():");

108+
			{

109-
exit(1);

109+
				perror("recvfrom():");

110
				exit(1);

111-
if(htons(eh->h_proto) == 0x806)

111+
			}

112
		if(ntohs(eh->h_proto) == ETH_P_ARP)

113
			{

114-
unsigned char buf_arp_dha[6];

114+
115-
unsigned char buf_arp_dpa[4];

115+
				unsigned char buf_arp_dha[6];

116
				unsigned char buf_arp_dpa[4];

117-
ah = (struct arp_header *)arphead;

117+
118-
if(htons(ah->arp_op) != 0x0001)

118+
				ah = (struct arp_header *)arphead;

119-
continue;

119+
				if(ntohs(ah->arp_op) != ARPOP_REQUEST)

120-
printf("buffer is---------------- %s \n",(char*)ah);

120+
					continue;

121-
printf("H/D TYPE : %x PROTO TYPE : %x \n",ah->arp_hd,ah->arp_pr);

121+
				printf("buffer is---------------- %s \n",(char*)ah);

122-
printf("H/D leng : %x PROTO leng : %x \n",ah->arp_hdl,ah->arp_prl);

122+
				printf("H/D TYPE : %x PROTO TYPE : %x \n",ah->arp_hd,ah->arp_pr);

123-
printf("OPERATION : %x \n", ah->arp_op);

123+
				printf("H/D leng : %x PROTO leng : %x \n",ah->arp_hdl,ah->arp_prl);

124-
printf("SENDER MAC address: %02X:%02X:%02X:%02X:%02X:%02X\n",

124+
				printf("OPERATION : %x \n", ah->arp_op);

125-
ah->arp_sha[0],

125+
				printf("SENDER MAC address: %02X:%02X:%02X:%02X:%02X:%02X\n",

126-
ah->arp_sha[1],

126+
				       ah->arp_sha[0],

127-
ah->arp_sha[2],

127+
				       ah->arp_sha[1],

128-
ah->arp_sha[3],

128+
				       ah->arp_sha[2],

129-
ah->arp_sha[4],

129+
				       ah->arp_sha[3],

130-
ah->arp_sha[5]

130+
				       ah->arp_sha[4],

131-
);

131+
				       ah->arp_sha[5]

132-
printf("SENDER IP address: %02d:%02d:%02d:%02d\n",

132+
				       );

133-
ah->arp_spa[0],

133+
				printf("SENDER IP address: %02d:%02d:%02d:%02d\n",

134-
ah->arp_spa[1],

134+
				       ah->arp_spa[0],

135-
ah->arp_spa[2],

135+
				       ah->arp_spa[1],

136-
ah->arp_spa[3]

136+
				       ah->arp_spa[2],

137-
);

137+
				       ah->arp_spa[3]

138-
if(ah->arp_spa[0]==10&&ah->arp_spa[1]==00&&ah->arp_spa[2]==00&&ah->arp_spa[3]==01)

138+
				       );

139
				#if 0

140-
printf("Sender ip is .............bam bam..........................................\n");

140+
				if(ah->arp_spa[0]==10&&ah->arp_spa[1]==00&&ah->arp_spa[2]==00&&ah->arp_spa[3]==01)

141-
system("sudo arp -s 10.0.0.1  00:1e:73:91:04:0d");

141+
					{

142
						printf("Sender ip is .............bam bam..........................................\n");

143-
printf("TARGET MAC address: %02X:%02X:%02X:%02X:%02X:%02X\n",

143+
						system("sudo arp -s 10.0.0.1  00:1e:73:91:04:0d");

144-
ah->arp_dha[0],

144+
					}

145-
ah->arp_dha[1],

145+
				#endif

146-
ah->arp_dha[2],

146+
				printf("TARGET MAC address: %02X:%02X:%02X:%02X:%02X:%02X\n",

147-
ah->arp_dha[3],

147+
				       ah->arp_dha[0],

148-
ah->arp_dha[4],

148+
				       ah->arp_dha[1],

149-
ah->arp_dha[5]

149+
				       ah->arp_dha[2],

150-
);

150+
				       ah->arp_dha[3],

151-
printf("TARGET IP address: %02d:%02d:%02d:%02d\n",

151+
				       ah->arp_dha[4],

152-
ah->arp_dpa[0],

152+
				       ah->arp_dha[5]

153-
ah->arp_dpa[1],

153+
				       );

154-
ah->arp_dpa[2],

154+
				printf("TARGET IP address: %02d:%02d:%02d:%02d\n",

155-
ah->arp_dpa[3]

155+
				       ah->arp_dpa[0],

156-
);

156+
				       ah->arp_dpa[1],

157
				       ah->arp_dpa[2],

158-
printf("+++++++++++++++++++++++++++++++++++++++\n" );

158+
				       ah->arp_dpa[3]

159-
printf("ETHER DST MAC address: %02X:%02X:%02X:%02X:%02X:%02X\n",

159+
				       );

160-
eh->h_dest[0],

160+
161-
eh->h_dest[1],

161+
				printf("+++++++++++++++++++++++++++++++++++++++\n" );

162-
eh->h_dest[2],

162+
				printf("ETHER DST MAC address: %02X:%02X:%02X:%02X:%02X:%02X\n",

163-
eh->h_dest[3],

163+
				       eh->h_dest[0],

164-
eh->h_dest[4],

164+
				       eh->h_dest[1],

165-
eh->h_dest[5]

165+
				       eh->h_dest[2],

166-
);

166+
				       eh->h_dest[3],

167-
printf("ETHER SRC MAC address: %02X:%02X:%02X:%02X:%02X:%02X\n",

167+
				       eh->h_dest[4],

168-
eh->h_source[0],

168+
				       eh->h_dest[5]

169-
eh->h_source[1],

169+
				       );

170-
eh->h_source[2],

170+
				printf("ETHER SRC MAC address: %02X:%02X:%02X:%02X:%02X:%02X\n",

171-
eh->h_source[3],

171+
				       eh->h_source[0],

172-
eh->h_source[4],

172+
				       eh->h_source[1],

173-
eh->h_source[5]

173+
				       eh->h_source[2],

174-
);

174+
				       eh->h_source[3],

175-
memcpy( (void*)etherhead, (const void*)(etherhead+ETH_MAC_LEN),

175+
				       eh->h_source[4],

176-
ETH_MAC_LEN);

176+
				       eh->h_source[5]

177-
memcpy( (void*)(etherhead+ETH_MAC_LEN), (const void*)src_mac,

177+
				       );

178-
ETH_MAC_LEN);

178+
				memcpy( (void*)etherhead, (const void*)(etherhead+ETH_MAC_LEN),

179-
eh->h_proto = ETH_ARP;

179+
				        ETH_MAC_LEN);

180-
printf("&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& \n");

180+
				memcpy( (void*)(etherhead+ETH_MAC_LEN), (const void*)src_mac,

181-
printf("ETHER DST MAC address: %02X:%02X:%02X:%02X:%02X:%02X\n",

181+
				        ETH_MAC_LEN);

182-
eh->h_dest[0],

182+
				eh->h_proto = htons(ETH_P_ARP);

183-
eh->h_dest[1],

183+
				printf("&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& \n");

184-
eh->h_dest[2],

184+
				printf("ETHER DST MAC address: %02X:%02X:%02X:%02X:%02X:%02X\n",

185-
eh->h_dest[3],

185+
				       eh->h_dest[0],

186-
eh->h_dest[4],

186+
				       eh->h_dest[1],

187-
eh->h_dest[5]

187+
				       eh->h_dest[2],

188-
);

188+
				       eh->h_dest[3],

189-
printf("ETHER SRC MAC address: %02X:%02X:%02X:%02X:%02X:%02X\n",

189+
				       eh->h_dest[4],

190-
eh->h_source[0],

190+
				       eh->h_dest[5]

191-
eh->h_source[1],

191+
				       );

192-
eh->h_source[2],

192+
				printf("ETHER SRC MAC address: %02X:%02X:%02X:%02X:%02X:%02X\n",

193-
eh->h_source[3],

193+
				       eh->h_source[0],

194-
eh->h_source[4],

194+
				       eh->h_source[1],

195-
eh->h_source[5]

195+
				       eh->h_source[2],

196-
);

196+
				       eh->h_source[3],

197-
ah->arp_hd = ntohs(ah->arp_hd);

197+
				       eh->h_source[4],

198-
ah->arp_pr = ntohs(ah->arp_pr);

198+
				       eh->h_source[5]

199
				       );

200-
ah->arp_op = 0x0002;

200+
				//ah->arp_hd = ntohs(ah->arp_hd);

201
				//ah->arp_pr = ntohs(ah->arp_pr);

202-
buf_arp_dpa[0] = ah->arp_dpa[0];

202+
203-
buf_arp_dpa[1] = ah->arp_dpa[1];

203+
				ah->arp_op = htons(ARPOP_REPLY);

204-
buf_arp_dpa[2] = ah->arp_dpa[2];

204+
205-
buf_arp_dpa[3] = ah->arp_dpa[3];

205+
				buf_arp_dpa[0] = ah->arp_dpa[0];

206
				buf_arp_dpa[1] = ah->arp_dpa[1];

207-
ah->arp_dha[0] = ah->arp_sha[0];

207+
				buf_arp_dpa[2] = ah->arp_dpa[2];

208-
ah->arp_dha[1] = ah->arp_sha[1];

208+
				buf_arp_dpa[3] = ah->arp_dpa[3];

209-
ah->arp_dha[2] = ah->arp_sha[2];

209+
210-
ah->arp_dha[3] = ah->arp_sha[3];

210+
				ah->arp_dha[0] = ah->arp_sha[0];

211-
ah->arp_dha[4] = ah->arp_sha[4];

211+
				ah->arp_dha[1] = ah->arp_sha[1];

212-
ah->arp_dha[5] = ah->arp_sha[5];

212+
				ah->arp_dha[2] = ah->arp_sha[2];

213
				ah->arp_dha[3] = ah->arp_sha[3];

214-
ah->arp_dpa[0] = ah->arp_spa[0];

214+
				ah->arp_dha[4] = ah->arp_sha[4];

215-
ah->arp_dpa[1] = ah->arp_spa[1];

215+
				ah->arp_dha[5] = ah->arp_sha[5];

216-
ah->arp_dpa[2] = ah->arp_spa[2];

216+
217-
ah->arp_dpa[3] = ah->arp_spa[3];

217+
				ah->arp_dpa[0] = ah->arp_spa[0];

218
				ah->arp_dpa[1] = ah->arp_spa[1];

219-
ah->arp_spa[0] = buf_arp_dpa[0];

219+
				ah->arp_dpa[2] = ah->arp_spa[2];

220-
ah->arp_spa[1] = buf_arp_dpa[1];

220+
				ah->arp_dpa[3] = ah->arp_spa[3];

221-
ah->arp_spa[2] = buf_arp_dpa[2];

221+
222-
ah->arp_spa[3] = buf_arp_dpa[3];

222+
				ah->arp_spa[0] = buf_arp_dpa[0];

223-
//change the sender mac address

223+
				ah->arp_spa[1] = buf_arp_dpa[1];

224-
ah->arp_sha[0] = 0x00;

224+
				ah->arp_spa[2] = buf_arp_dpa[2];

225-
ah->arp_sha[1] = 0x1e;

225+
				ah->arp_spa[3] = buf_arp_dpa[3];

226-
ah->arp_sha[2] = 0x73;

226+
				//change the sender mac address

227-
ah->arp_sha[3] = 0x78;

227+
				ah->arp_sha[0] = 0x00;

228-
ah->arp_sha[4] = 0x9a;

228+
				ah->arp_sha[1] = 0x1e;

229-
ah->arp_sha[5] = 0x0d;

229+
				ah->arp_sha[2] = 0x73;

230
				ah->arp_sha[3] = 0x78;

231-
socket_address.sll_addr[0] = eh->h_dest[0];

231+
				ah->arp_sha[4] = 0x9a;

232-
socket_address.sll_addr[1] = eh->h_dest[1];

232+
				ah->arp_sha[5] = 0x0d;

233-
socket_address.sll_addr[2] = eh->h_dest[2];

233+
234-
socket_address.sll_addr[3] = eh->h_dest[3];

234+
				socket_address.sll_addr[0] = eh->h_dest[0];

235-
socket_address.sll_addr[4] = eh->h_dest[4];

235+
				socket_address.sll_addr[1] = eh->h_dest[1];

236-
socket_address.sll_addr[5] = eh->h_dest[5];

236+
				socket_address.sll_addr[2] = eh->h_dest[2];

237-
printf("=======================================\n" );

237+
				socket_address.sll_addr[3] = eh->h_dest[3];

238-
printf("SENDER MAC address: %02X:%02X:%02X:%02X:%02X:%02X\n",

238+
				socket_address.sll_addr[4] = eh->h_dest[4];

239-
ah->arp_sha[0],

239+
				socket_address.sll_addr[5] = eh->h_dest[5];

240-
ah->arp_sha[1],

240+
				printf("=======================================\n" );

241-
ah->arp_sha[2],

241+
				printf("SENDER MAC address: %02X:%02X:%02X:%02X:%02X:%02X\n",

242-
ah->arp_sha[3],

242+
				       ah->arp_sha[0],

243-
ah->arp_sha[4],

243+
				       ah->arp_sha[1],

244-
ah->arp_sha[5]

244+
				       ah->arp_sha[2],

245-
);

245+
				       ah->arp_sha[3],

246-
printf("SENDER IP address: %02d:%02d:%02d:%02d\n",

246+
				       ah->arp_sha[4],

247-
ah->arp_spa[0],

247+
				       ah->arp_sha[5]

248-
ah->arp_spa[1],

248+
				       );

249-
ah->arp_spa[2],

249+
				printf("SENDER IP address: %02d:%02d:%02d:%02d\n",

250-
ah->arp_spa[3]

250+
				       ah->arp_spa[0],

251-
);

251+
				       ah->arp_spa[1],

252-
if((ah->arp_spa[0]==10 && ah->arp_spa[1]==0 && ah->arp_spa[2]==0 && ah->arp_spa[3]==1))

252+
				       ah->arp_spa[2],

253-
printf("------------------------------------------10.0.0.1-----------------------------------------\n");

253+
				       ah->arp_spa[3]

254-
printf("TARGET MAC address: %02X:%02X:%02X:%02X:%02X:%02X\n",

254+
				       );

255-
ah->arp_dha[0],

255+
				if((ah->arp_spa[0]==10 && ah->arp_spa[1]==0 && ah->arp_spa[2]==0 && ah->arp_spa[3]==1))

256-
ah->arp_dha[1],

256+
					printf("------------------------------------------10.0.0.1-----------------------------------------\n");

257-
ah->arp_dha[2],

257+
				printf("TARGET MAC address: %02X:%02X:%02X:%02X:%02X:%02X\n",

258-
ah->arp_dha[3],

258+
				       ah->arp_dha[0],

259-
ah->arp_dha[4],

259+
				       ah->arp_dha[1],

260-
ah->arp_dha[5]

260+
				       ah->arp_dha[2],

261-
);

261+
				       ah->arp_dha[3],

262-
printf("TARGET IP address: %02d:%02d:%02d:%02d\n",

262+
				       ah->arp_dha[4],

263-
ah->arp_dpa[0],

263+
				       ah->arp_dha[5]

264-
ah->arp_dpa[1],

264+
				       );

265-
ah->arp_dpa[2],

265+
				printf("TARGET IP address: %02d:%02d:%02d:%02d\n",

266-
ah->arp_dpa[3]

266+
				       ah->arp_dpa[0],

267-
);

267+
				       ah->arp_dpa[1],

268-
printf("H/D TYPE : %x PROTO TYPE : %x \n",ah->arp_hd,ah->arp_pr);

268+
				       ah->arp_dpa[2],

269-
printf("H/D leng : %x PROTO leng : %x \n",ah->arp_hdl,ah->arp_prl);

269+
				       ah->arp_dpa[3]

270-
printf("OPERATION : %x \n", ah->arp_op);

270+
				       );

271
				printf("H/D TYPE : %x PROTO TYPE : %x \n",ah->arp_hd,ah->arp_pr);

272-
sent = sendto(s, buffer, BUF_SIZE, 0, (struct

272+
				printf("H/D leng : %x PROTO leng : %x \n",ah->arp_hdl,ah->arp_prl);

273-
sockaddr*)&socket_address, sizeof(socket_address));

273+
				printf("OPERATION : %x \n", ah->arp_op);

274-
if (sent == -1)

274+
275
				sent = sendto(s, buffer, BUF_SIZE, 0, (struct

276-
perror("sendto():");

276+
				                                       sockaddr*)&socket_address, sizeof(socket_address));

277-
exit(1);

277+
				if (sent == -1)

278
					{

279
						perror("sendto():");

280-
answered_packets++;

280+
						exit(1);

281
					}

282
283
				answered_packets++;

284-
total_packets++;

284+
285
			}

286
287
		total_packets++;

288
289-
/*Clean up.......*/

289+
	}

290
}

291-
struct ifreq ifr;

291+
292
	/*Clean up.......*/

293-
if (s == -1)

293+
294-
return;

294+
	struct ifreq ifr;

295
296-
strncpy(ifr.ifr_name, DEVICE, IFNAMSIZ);

296+
	if (s == -1)

297-
ioctl(s, SIOCGIFFLAGS, &ifr);

297+
		return;

298-
ifr.ifr_flags &= ~IFF_PROMISC;

298+
299-
ioctl(s, SIOCSIFFLAGS, &ifr);

299+
	strncpy(ifr.ifr_name, DEVICE, IFNAMSIZ);

300-
close(s);

300+
	ioctl(s, SIOCGIFFLAGS, &ifr);

301
	ifr.ifr_flags &= ~IFF_PROMISC;

302-
free(buffer);

302+
	ioctl(s, SIOCSIFFLAGS, &ifr);

303
	close(s);

304-
printf("Server terminating....\n");

304+
305
	free(buffer);

306-
printf("Totally received: %ld packets\n", total_packets);

306+
307-
printf("Answered %ld packets\n", answered_packets);

307+
	printf("Server terminating....\n");

308-
exit(0);

308+
309
	printf("Totally received: %ld packets\n", total_packets);

310
	printf("Answered %ld packets\n", answered_packets);

311
	exit(0);

312
}
        

    


            


                                


        

            



                
    

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