unix网络编程的5.12代码,当客户端试图连接时,出现溢出

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23:14:20.264150 IP (tos 0x0, ttl 64, id 59526, offset 0, flags [DF], proto TCP (6), length 60)    localhost.53275 > localhost.7337: Flags [S], cksum 0xfe30 (incorrect -> 0xbc55), seq 4155017995, win 32792, options [mss 16396,sackOK,TS val 3236749 ecr 0,nop,wscale 7], length 023:14:20.264169 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 40)    localhost.7337 > localhost.53275: Flags [R.], cksum 0x4254 (correct), seq 0, ack 4155017996, win 0, length 023:14:20.272859 IP (tos 0x0, ttl 64, id 42325, offset 0, flags [DF], proto TCP (6), length 60)    localhost.53276 > localhost.7337: Flags [S], cksum 0xfe30 (incorrect -> 0xdfc0), seq 2557200090, win 32792, options [mss 16396,sackOK,TS val 3236751 ecr 0,nop,wscale 7], length 023:14:20.272878 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 40)    localhost.7337 > localhost.53276: Flags [R.], cksum 0x65c1 (correct), seq 0, ack 2557200091, win 0, length 023:14:35.499466 IP (tos 0x0, ttl 64, id 2980, offset 0, flags [DF], proto TCP (6), length 60)    localhost.53277 > localhost.7337: Flags [S], cksum 0xfe30 (incorrect -> 0xe883), seq 3453581769, win 32792, options [mss 16396,sackOK,TS val 3240558 ecr 0,nop,wscale 7], length 023:14:35.499490 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 40)    localhost.7337 > localhost.53277: Flags [R.], cksum 0x7d63 (correct), seq 0, ack 3453581770, win 0, length 023:14:35.508488 IP (tos 0x0, ttl 64, id 55398, offset 0, flags [DF], proto TCP (6), length 60)    localhost.53278 > localhost.7337: Flags [S], cksum 0xfe30 (incorrect -> 0x3727), seq 1323739670, win 32792, options [mss 16396,sackOK,TS val 3240560 ecr 0,nop,wscale 7], length 023:14:35.508508 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 40)    localhost.7337 > localhost.53278: Flags [R.], cksum 0xcc08 (correct), seq 0, ack 1323739671, win 0, length 023:14:49.109716 IP (tos 0x0, ttl 64, id 1896, offset 0, flags [DF], proto UDP (17), length 44)    localhost.33468 > localhost.33468: [bad udp cksum 0xfe2b -> 0xc94e!] UDP, length 1623:14:49.121604 IP (tos 0x0, ttl 64, id 1897, offset 0, flags [DF], proto UDP (17), length 48)    localhost.33468 > localhost.33468: [bad udp cksum 0xfe2f -> 0xbe36!] UDP, length 2023:14:49.124600 IP (tos 0x0, ttl 64, id 1898, offset 0, flags [DF], proto UDP (17), length 44)    localhost.33468 > localhost.33468: [bad udp cksum 0xfe2b -> 0x4e9a!] UDP, length 1623:14:49.136615 IP (tos 0x0, ttl 64, id 1899, offset 0, flags [DF], proto UDP (17), length 952)    localhost.33468 > localhost.33468: [bad udp cksum 0x01b8 -> 0x778f!] UDP, length 92423:14:49.136779 IP (tos 0x0, ttl 64, id 1900, offset 0, flags [DF], proto UDP (17), length 252)    localhost.33468 > localhost.33468: [bad udp cksum 0xfefb -> 0x824d!] UDP, length 22423:14:49.136872 IP (tos 0x0, ttl 64, id 1901, offset 0, flags [DF], proto UDP (17), length 452)    localhost.33468 > localhost.33468: [bad udp cksum 0xffc3 -> 0xb8eb!] UDP, length 42423:14:50.731870 IP (tos 0x0, ttl 64, id 36744, offset 0, flags [DF], proto TCP (6), length 60)    localhost.53279 > localhost.7337: Flags [S], cksum 0xfe30 (incorrect -> 0xa539), seq 1833242310, win 32792, options [mss 16396,sackOK,TS val 3244366 ecr 0,nop,wscale 7], length 023:14:50.731891 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 40)    localhost.7337 > localhost.53279: Flags [R.], cksum 0x48f9 (correct), seq 0, ack 1833242311, win 0, length 023:14:50.740684 IP (tos 0x0, ttl 64, id 24429, offset 0, flags [DF], proto TCP (6), length 60)    localhost.53280 > localhost.7337: Flags [S], cksum 0xfe30 (incorrect -> 0x5f36), seq 3821919805, win 32792, options [mss 16396,sackOK,TS val 3244368 ecr 0,nop,wscale 7], length 023:14:50.740704 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 40)    localhost.7337 > localhost.53280: Flags [R.], cksum 0x02f8 (correct), seq 0, ack 3821919806, win 0, length 023:15:05.967788 IP (tos 0x0, ttl 64, id 20013, offset 0, flags [DF], proto TCP (6), length 60)    localhost.53281 > localhost.7337: Flags [S], cksum 0xfe30 (incorrect -> 0x4459), seq 4026916354, win 32792, options [mss 16396,sackOK,TS val 3248175 ecr 0,nop,wscale 7], length 023:15:05.967812 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 40)    localhost.7337 > localhost.53281: Flags [R.], cksum 0xf6f9 (correct), seq 0, ack 4026916355, win 0, length 023:15:05.976587 IP (tos 0x0, ttl 64, id 64091, offset 0, flags [DF], proto TCP (6), length 60)    localhost.53282 > localhost.7337: Flags [S], cksum 0xfe30 (incorrect -> 0x23a5), seq 2219797098, win 32792, options [mss 16396,sackOK,TS val 3248177 ecr 0,nop,wscale 7], length 023:15:05.976607 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 40)    localhost.7337 > localhost.53282: Flags [R.], cksum 0xd647 (correct), seq 0, ack 2219797099, win 0, length 023:15:13.123602 IP (tos 0x0, ttl 64, id 1186, offset 0, flags [DF], proto TCP (6), length 52)    localhost.56446 > localhost.9130: Flags [F.], cksum 0xfe28 (incorrect -> 0x5d61), seq 3552319153, ack 2454909905, win 257, options [nop,nop,TS val 3249964 ecr 3084816], length 023:15:13.123663 IP (tos 0x0, ttl 64, id 53447, offset 0, flags [DF], proto TCP (6), length 52)    localhost.56447 > localhost.9130: Flags [F.], cksum 0xfe28 (incorrect -> 0x4c4c), seq 49332950, ack 2945715275, win 257, options [nop,nop,TS val 3249964 ecr 3084816], length 023:15:13.123677 IP (tos 0x0, ttl 64, id 28303, offset 0, flags [DF], proto TCP (6), length 52)    localhost.56448 > localhost.9130: Flags [F.], cksum 0xfe28 (incorrect -> 0xd174), seq 173309086, ack 2377246680, win 257, options [nop,nop,TS val 3249964 ecr 3084816], length 023:15:13.123691 IP (tos 0x0, ttl 64, id 7680, offset 0, flags [DF], proto TCP (6), length 52)    localhost.56449 > localhost.9130: Flags [F.], cksum 0xfe28 (incorrect -> 0xeab1), seq 3690270703, ack 2207019981, win 257, options [nop,nop,TS val 3249964 ecr 3084816], length 023:15:13.123704 IP (tos 0x0, ttl 64, id 49635, offset 0, flags [DF], proto TCP (6), length 52)    localhost.56450 > localhost.9130: Flags [F.], cksum 0xfe28 (incorrect -> 0xf6d8), seq 12, ack 1, win 257, options [nop,nop,TS val 3249964 ecr 3194243], length 023:15:13.127407 IP (tos 0x0, ttl 64, id 57793, offset 0, flags [DF], proto TCP (6), length 52)    localhost.9130 > localhost.56446: Flags [.], cksum 0xfe28 (incorrect -> 0xd842), seq 1, ack 1, win 256, options [nop,nop,TS val 3249965 ecr 3249964], length 023:15:13.127438 IP (tos 0x0, ttl 64, id 7771, offset 0, flags [DF], proto TCP (6), length 52)    localhost.9130 > localhost.56447: Flags [.], cksum 0xfe28 (incorrect -> 0xc72d), seq 1, ack 1, win 256, options [nop,nop,TS val 3249965 ecr 3249964], length 023:15:13.127443 IP (tos 0x0, ttl 64, id 62920, offset 0, flags [DF], proto TCP (6), length 52)    localhost.9130 > localhost.56448: Flags [.], cksum 0xfe28 (incorrect -> 0x4c56), seq 1, ack 1, win 256, options [nop,nop,TS val 3249965 ecr 3249964], length 023:15:13.127449 IP (tos 0x0, ttl 64, id 25053, offset 0, flags [DF], proto TCP (6), length 52)    localhost.9130 > localhost.56449: Flags [.], cksum 0xfe28 (incorrect -> 0x6593), seq 1, ack 1, win 256, options [nop,nop,TS val 3249965 ecr 3249964], length 023:15:13.163405 IP (tos 0x0, ttl 64, id 59069, offset 0, flags [DF], proto TCP (6), length 52)    localhost.9130 > localhost.56450: Flags [.], cksum 0xfe28 (incorrect -> 0x1d26), seq 1, ack 13, win 256, options [nop,nop,TS val 3249974 ecr 3249964], length 023:15:19.048880 IP (tos 0x0, ttl 64, id 1902, offset 0, flags [DF], proto UDP (17), length 44)    localhost.33468 > localhost.33468: [bad udp cksum 0xfe2b -> 0x2b77!] UDP, length 1623:15:19.060677 IP (tos 0x0, ttl 64, id 1903, offset 0, flags [DF], proto UDP (17), length 48)    localhost.33468 > localhost.33468: [bad udp cksum 0xfe2f -> 0xbe70!] UDP, length 2023:15:19.063594 IP (tos 0x0, ttl 64, id 1904, offset 0, flags [DF], proto UDP (17), length 44)    localhost.33468 > localhost.33468: [bad udp cksum 0xfe2b -> 0x53c3!] UDP, length 1623:15:19.075544 IP (tos 0x0, ttl 64, id 1905, offset 0, flags [DF], proto UDP (17), length 952)    localhost.33468 > localhost.33468: [bad udp cksum 0x01b8 -> 0x84a3!] UDP, length 92423:15:19.075571 IP (tos 0x0, ttl 64, id 1906, offset 0, flags [DF], proto UDP (17), length 252)    localhost.33468 > localhost.33468: [bad udp cksum 0xfefb -> 0xd15e!] UDP, length 22423:15:19.075586 IP (tos 0x0, ttl 64, id 1907, offset 0, flags [DF], proto UDP (17), length 452)    localhost.33468 > localhost.33468: [bad udp cksum 0xffc3 -> 0xb8eb!] UDP, length 42423:15:21.456352 IP (tos 0x0, ttl 64, id 12984, offset 0, flags [DF], proto TCP (6), length 60)    localhost.53284 > localhost.7337: Flags [S], cksum 0xfe30 (incorrect -> 0x5c33), seq 4178816503, win 32792, options [mss 16396,sackOK,TS val 3252047 ecr 0,nop,wscale 7], length 023:15:21.456374 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 40)    localhost.7337 > localhost.53284: Flags [R.], cksum 0x1df4 (correct), seq 0, ack 4178816504, win 0, length 023:15:21.465037 IP (tos 0x0, ttl 64, id 63741, offset 0, flags [DF], proto TCP (6), length 60)    localhost.53285 > localhost.7337: Flags [S], cksum 0xfe30 (incorrect -> 0x4e22), seq 1299015596, win 32792, options [mss 16396,sackOK,TS val 3252049 ecr 0,nop,wscale 7], length 023:15:21.465055 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 40)    localhost.7337 > localhost.53285: Flags [R.], cksum 0x0fe5 (correct), seq 0, ack 1299015597, win 0, length 023:15:36.690547 IP (tos 0x0, ttl 64, id 30655, offset 0, flags [DF], proto TCP (6), length 60)    localhost.53286 > localhost.7337: Flags [S], cksum 0xfe30 (incorrect -> 0xba1a), seq 1622268304, win 32792, options [mss 16396,sackOK,TS val 3255855 ecr 0,nop,wscale 7], length 023:15:36.690567 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 40)    localhost.7337 > localhost.53286: Flags [R.], cksum 0x8abb (correct), seq 0, ack 1622268305, win 0, length 023:15:36.699360 IP (tos 0x0, ttl 64, id 31319, offset 0, flags [DF], proto TCP (6), length 60)    localhost.53287 > localhost.7337: Flags [S], cksum 0xfe30 (incorrect -> 0xdaa4), seq 1162794086, win 32792, options [mss 16396,sackOK,TS val 3255857 ecr 0,nop,wscale 7], length 023:15:36.699379 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 40)    localhost.7337 > localhost.53287: Flags [R.], cksum 0xab47 (correct), seq 0, ack 1162794087, win 0, length 023:15:49.139468 IP (tos 0x0, ttl 64, id 1908, offset 0, flags [DF], proto UDP (17), length 44)    localhost.33468 > localhost.33468: [bad udp cksum 0xfe2b -> 0x1b50!] UDP, length 1623:15:49.151316 IP (tos 0x0, ttl 64, id 1909, offset 0, flags [DF], proto UDP (17), length 48)    localhost.33468 > localhost.33468: [bad udp cksum 0xfe2f -> 0x1738!] UDP, length 2023:15:49.154320 IP (tos 0x0, ttl 64, id 1910, offset 0, flags [DF], proto UDP (17), length 44)    localhost.33468 > localhost.33468: [bad udp cksum 0xfe2b -> 0xb39b!] UDP, length 1623:15:49.166303 IP (tos 0x0, ttl 64, id 1911, offset 0, flags [DF], proto UDP (17), length 952)    localhost.33468 > localhost.33468: [bad udp cksum 0x01b8 -> 0x778f!] UDP, length 92423:15:49.166468 IP (tos 0x0, ttl 64, id 1912, offset 0, flags [DF], proto UDP (17), length 252)    localhost.33468 > localhost.33468: [bad udp cksum 0xfefb -> 0x824d!] UDP, length 22423:15:49.166562 IP (tos 0x0, ttl 64, id 1913, offset 0, flags [DF], proto UDP (17), length 452)    localhost.33468 > localhost.33468: [bad udp cksum 0xffc3 -> 0xb8eb!] UDP, length 42423:15:51.920004 IP (tos 0x0, ttl 64, id 8573, offset 0, flags [DF], proto TCP (6), length 60)    localhost.53288 > localhost.7337: Flags [S], cksum 0xfe30 (incorrect -> 0x1f8c), seq 696032370, win 32792, options [mss 16396,sackOK,TS val 3259663 ecr 0,nop,wscale 7], length 023:15:51.920023 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 40)    localhost.7337 > localhost.53288: Flags [R.], cksum 0xff0c (correct), seq 0, ack 696032371, win 0, length 023:15:51.930815 IP (tos 0x0, ttl 64, id 62462, offset 0, flags [DF], proto TCP (6), length 60)    localhost.53289 > localhost.7337: Flags [S], cksum 0xfe30 (incorrect -> 0x214f), seq 1966690031, win 32792, options [mss 16396,sackOK,TS val 3259665 ecr 0,nop,wscale 7], length 023:15:51.930834 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 40)    localhost.7337 > localhost.53289: Flags [R.], cksum 0x00d2 (correct), seq 0, ack 1966690032, win 0, length 023:16:03.690806 IP (tos 0x0, ttl 64, id 59070, offset 0, flags [DF], proto TCP (6), length 52)    localhost.9130 > localhost.56450: Flags [R.], cksum 0xfe28 (incorrect -> 0xebca), seq 1, ack 13, win 256, options [nop,nop,TS val 3262605 ecr 3249964], length 023:16:03.691031 IP (tos 0x0, ttl 64, id 25054, offset 0, flags [DF], proto TCP (6), length 52)    localhost.9130 > localhost.56449: Flags [F.], cksum 0xfe28 (incorrect -> 0x3432), seq 1, ack 1, win 256, options [nop,nop,TS val 3262605 ecr 3249964], length 023:16:03.691056 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 52)    localhost.56449 > localhost.9130: Flags [.], cksum 0x02d0 (correct), seq 1, ack 2, win 257, options [nop,nop,TS val 3262605 ecr 3262605], length 023:16:03.691191 IP (tos 0x0, ttl 64, id 62921, offset 0, flags [DF], proto TCP (6), length 52)    localhost.9130 > localhost.56448: Flags [F.], cksum 0xfe28 (incorrect -> 0x1af5), seq 1, ack 1, win 256, options [nop,nop,TS val 3262605 ecr 3249964], length 023:16:03.691206 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 52)    localhost.56448 > localhost.9130: Flags [.], cksum 0xe992 (correct), seq 1, ack 2, win 257, options [nop,nop,TS val 3262605 ecr 3262605], length 023:16:03.691323 IP (tos 0x0, ttl 64, id 7772, offset 0, flags [DF], proto TCP (6), length 52)    localhost.9130 > localhost.56447: Flags [F.], cksum 0xfe28 (incorrect -> 0x95cc), seq 1, ack 1, win 256, options [nop,nop,TS val 3262605 ecr 3249964], length 023:16:03.691339 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 52)    localhost.56447 > localhost.9130: Flags [.], cksum 0x646a (correct), seq 1, ack 2, win 257, options [nop,nop,TS val 3262605 ecr 3262605], length 023:16:03.691553 IP (tos 0x0, ttl 64, id 57794, offset 0, flags [DF], proto TCP (6), length 52)    localhost.9130 > localhost.56446: Flags [F.], cksum 0xfe28 (incorrect -> 0xa6e0), seq 1, ack 1, win 256, options [nop,nop,TS val 3262606 ecr 3249964], length 023:16:03.691570 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 52)    localhost.56446 > localhost.9130: Flags [.], cksum 0x757d (correct), seq 1, ack 2, win 257, options [nop,nop,TS val 3262606 ecr 3262606], length 023:16:07.157533 IP (tos 0x0, ttl 64, id 35284, offset 0, flags [DF], proto TCP (6), length 60)    localhost.53290 > localhost.7337: Flags [S], cksum 0xfe30 (incorrect -> 0xd750), seq 3173138980, win 32792, options [mss 16396,sackOK,TS val 3263472 ecr 0,nop,wscale 7], length 023:16:07.157551 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 40)    localhost.7337 > localhost.53290: Flags [R.], cksum 0xc5b2 (correct), seq 0, ack 3173138981, win 0, length 023:16:07.166465 IP (tos 0x0, ttl 64, id 48327, offset 0, flags [DF], proto TCP (6), length 60)    localhost.53291 > localhost.7337: Flags [S], cksum 0xfe30 (incorrect -> 0x2956), seq 906590005, win 32792, options [mss 16396,sackOK,TS val 3263474 ecr 0,nop,wscale 7], length 023:16:07.166483 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 40)    localhost.7337 > localhost.53291: Flags [R.], cksum 0x17ba (correct), seq 0, ack 906590006, win 0, length 023:16:19.078472 IP (tos 0x0, ttl 64, id 1914, offset 0, flags [DF], proto UDP (17), length 44)    localhost.33468 > localhost.33468: [bad udp cksum 0xfe2b -> 0xf878!] UDP, length 1623:16:19.090247 IP (tos 0x0, ttl 64, id 1915, offset 0, flags [DF], proto UDP (17), length 48)    localhost.33468 > localhost.33468: [bad udp cksum 0xfe2f -> 0xac72!] UDP, length 2023:16:19.093190 IP (tos 0x0, ttl 64, id 1916, offset 0, flags [DF], proto UDP (17), length 44)    localhost.33468 > localhost.33468: [bad udp cksum 0xfe2b -> 0x24c5!] UDP, length 1623:16:19.104468 IP (tos 0x0, ttl 64, id 1917, offset 0, flags [DF], proto UDP (17), length 952)    localhost.33468 > localhost.33468: [bad udp cksum 0x01b8 -> 0x84a3!] UDP, length 92423:16:19.104498 IP (tos 0x0, ttl 64, id 1918, offset 0, flags [DF], proto UDP (17), length 252)    localhost.33468 > localhost.33468: [bad udp cksum 0xfefb -> 0xd15e!] UDP, length 22423:16:19.104512 IP (tos 0x0, ttl 64, id 1919, offset 0, flags [DF], proto UDP (17), length 452)    localhost.33468 > localhost.33468: [bad udp cksum 0xffc3 -> 0xb8eb!] UDP, length 42423:16:22.393448 IP (tos 0x0, ttl 64, id 31309, offset 0, flags [DF], proto TCP (6), length 60)    localhost.53292 > localhost.7337: Flags [S], cksum 0xfe30 (incorrect -> 0x0763), seq 531996828, win 32792, options [mss 16396,sackOK,TS val 3267281 ecr 0,nop,wscale 7], length 023:16:22.393472 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 40)    localhost.7337 > localhost.53292: Flags [R.], cksum 0x04a6 (correct), seq 0, ack 531996829, win 0, length 023:16:22.403323 IP (tos 0x0, ttl 64, id 61038, offset 0, flags [DF], proto TCP (6), length 60)    localhost.53293 > localhost.7337: Flags [S], cksum 0xfe30 (incorrect -> 0x467e), seq 1282815165, win 32792, options [mss 16396,sackOK,TS val 3267283 ecr 0,nop,wscale 7], length 023:16:22.403342 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 40)    localhost.7337 > localhost.53293: Flags [R.], cksum 0x43c3 (correct), seq 0, ack 1282815166, win 0, length 023:16:37.627843 IP (tos 0x0, ttl 64, id 43871, offset 0, flags [DF], proto TCP (6), length 60)    localhost.53294 > localhost.7337: Flags [S], cksum 0xfe30 (incorrect -> 0x786d), seq 4252386029, win 32792, options [mss 16396,sackOK,TS val 3271090 ecr 0,nop,wscale 7], length 023:16:37.627862 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 40)    localhost.7337 > localhost.53294: Flags [R.], cksum 0x8491 (correct), seq 0, ack 4252386030, win 0, length 023:16:37.636696 IP (tos 0x0, ttl 64, id 23065, offset 0, flags [DF], proto TCP (6), length 60)    localhost.53295 > localhost.7337: Flags [S], cksum 0xfe30 (incorrect -> 0x2191), seq 3817845677, win 32792, options [mss 16396,sackOK,TS val 3271092 ecr 0,nop,wscale 7], length 023:16:37.636714 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 40)    localhost.7337 > localhost.53295: Flags [R.], cksum 0x2db7 (correct), seq 0, ack 3817845678, win 0, length 023:16:49.122053 IP (tos 0x0, ttl 64, id 1920, offset 0, flags [DF], proto UDP (17), length 100)    localhost.33468 > localhost.33468: [bad udp cksum 0xfe63 -> 0xa7d2!] UDP, length 7223:16:49.169809 IP (tos 0x0, ttl 64, id 1921, offset 0, flags [DF], proto UDP (17), length 44)    localhost.33468 > localhost.33468: [bad udp cksum 0xfe2b -> 0xe54e!] UDP, length 1623:16:49.181671 IP (tos 0x0, ttl 64, id 1922, offset 0, flags [DF], proto UDP (17), length 48)    localhost.33468 > localhost.33468: [bad udp cksum 0xfe2f -> 0xf636!] UDP, length 2023:16:49.184830 IP (tos 0x0, ttl 64, id 1923, offset 0, flags [DF], proto UDP (17), length 44)    localhost.33468 > localhost.33468: [bad udp cksum 0xfe2b -> 0xdc99!] UDP, length 1623:16:49.196923 IP (tos 0x0, ttl 64, id 1924, offset 0, flags [DF], proto UDP (17), length 952)    localhost.33468 > localhost.33468: [bad udp cksum 0x01b8 -> 0x778f!] UDP, length 92423:16:49.196952 IP (tos 0x0, ttl 64, id 1925, offset 0, flags [DF], proto UDP (17), length 252)    localhost.33468 > localhost.33468: [bad udp cksum 0xfefb -> 0x824d!] UDP, length 22423:16:49.196966 IP (tos 0x0, ttl 64, id 1926, offset 0, flags [DF], proto UDP (17), length 452)    localhost.33468 > localhost.33468: [bad udp cksum 0xffc3 -> 0xb8eb!] UDP, length 42423:16:52.863786 IP (tos 0x0, ttl 64, id 25349, offset 0, flags [DF], proto TCP (6), length 60)    localhost.53296 > localhost.7337: Flags [S], cksum 0xfe30 (incorrect -> 0x1784), seq 4141063062, win 32792, options [mss 16396,sackOK,TS val 3274899 ecr 0,nop,wscale 7], length 023:16:52.863810 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 40)    localhost.7337 > localhost.53296: Flags [R.], cksum 0x3289 (correct), seq 0, ack 4141063063, win 0, length 023:16:52.872547 IP (tos 0x0, ttl 64, id 2502, offset 0, flags [DF], proto TCP (6), length 60)    localhost.53297 > localhost.7337: Flags [S], cksum 0xfe30 (incorrect -> 0x5388), seq 1695543635, win 32792, options [mss 16396,sackOK,TS val 3274901 ecr 0,nop,wscale 7], length 023:16:52.872566 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 40)    localhost.7337 > localhost.53297: Flags [R.], cksum 0x6e8f (correct), seq 0, ack 1695543636, win 0, length 023:17:08.096445 IP (tos 0x0, ttl 64, id 21149, offset 0, flags [DF], proto TCP (6), length 60)    localhost.53298 > localhost.7337: Flags [S], cksum 0xfe30 (incorrect -> 0x203d), seq 618747374, win 32792, options [mss 16396,sackOK,TS val 3278707 ecr 0,nop,wscale 7], length 023:17:08.096463 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 40)    localhost.7337 > localhost.53298: Flags [R.], cksum 0x4a22 (correct), seq 0, ack 618747375, win 0, length 023:17:08.105125 IP (tos 0x0, ttl 64, id 27807, offset 0, flags [DF], proto TCP (6), length 60)    localhost.53299 > localhost.7337: Flags [S], cksum 0xfe30 (incorrect -> 0xce88), seq 1620470762, win 32792, options [mss 16396,sackOK,TS val 3278709 ecr 0,nop,wscale 7], length 023:17:08.105145 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 40)    localhost.7337 > localhost.53299: Flags [R.], cksum 0xf86f (correct), seq 0, ack 1620470763, win 0, length 023:17:19.106751 IP (tos 0x0, ttl 64, id 1927, offset 0, flags [DF], proto UDP (17), length 44)    localhost.33468 > localhost.33468: [bad udp cksum 0xfe2b -> 0xf37f!] UDP, length 1623:17:19.118524 IP (tos 0x0, ttl 64, id 1928, offset 0, flags [DF], proto UDP (17), length 48)    localhost.33468 > localhost.33468: [bad udp cksum 0xfe2f -> 0xa279!] UDP, length 2023:17:19.121467 IP (tos 0x0, ttl 64, id 1929, offset 0, flags [DF], proto UDP (17), length 44)    localhost.33468 > localhost.33468: [bad udp cksum 0xfe2b -> 0x1ccc!] UDP, length 1623:17:19.132767 IP (tos 0x0, ttl 64, id 1930, offset 0, flags [DF], proto UDP (17), length 952)    localhost.33468 > localhost.33468: [bad udp cksum 0x01b8 -> 0x84a3!] UDP, length 92423:17:19.132797 IP (tos 0x0, ttl 64, id 1931, offset 0, flags [DF], proto UDP (17), length 252)    localhost.33468 > localhost.33468: [bad udp cksum 0xfefb -> 0xd15e!] UDP, length 22423:17:19.132811 IP (tos 0x0, ttl 64, id 1932, offset 0, flags [DF], proto UDP (17), length 452)    localhost.33468 > localhost.33468: [bad udp cksum 0xffc3 -> 0xb8eb!] UDP, length 42423:17:23.327234 IP (tos 0x0, ttl 64, id 62954, offset 0, flags [DF], proto TCP (6), length 60)    localhost.53322 > localhost.7337: Flags [S], cksum 0xfe30 (incorrect -> 0x31b3), seq 1990845368, win 32792, options [mss 16396,sackOK,TS val 3282514 ecr 0,nop,wscale 7], length 023:17:23.327251 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 40)    localhost.7337 > localhost.53322: Flags [R.], cksum 0x6a77 (correct), seq 0, ack 1990845369, win 0, length 023:17:23.592808 IP (tos 0x0, ttl 64, id 61047, offset 0, flags [DF], proto TCP (6), length 60)    localhost.53323 > localhost.7337: Flags [S], cksum 0xfe30 (incorrect -> 0x18f8), seq 2046228706, win 32792, options [mss 16396,sackOK,TS val 3282581 ecr 0,nop,wscale 7], length 023:17:23.592829 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 40)    localhost.7337 > localhost.53323: Flags [R.], cksum 0x51ff (correct), seq 0, ack 2046228707, win 0, length 023:17:38.815485 IP (tos 0x0, ttl 64, id 33982, offset 0, flags [DF], proto TCP (6), length 60)    localhost.53325 > localhost.7337: Flags [S], cksum 0xfe30 (incorrect -> 0xaf4b), seq 735617485, win 32792, options [mss 16396,sackOK,TS val 3286387 ecr 0,nop,wscale 7], length 023:17:38.815506 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 40)    localhost.7337 > localhost.53325: Flags [R.], cksum 0xf730 (correct), seq 0, ack 735617486, win 0, length 023:17:38.827713 IP (tos 0x0, ttl 64, id 12317, offset 0, flags [DF], proto TCP (6), length 60)    localhost.53326 > localhost.7337: Flags [S], cksum 0xfe30 (incorrect -> 0x925f), seq 3575780715, win 32792, options [mss 16396,sackOK,TS val 3286390 ecr 0,nop,wscale 7], length 023:17:38.827731 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 40)    localhost.7337 > localhost.53326: Flags [R.], cksum 0xda47 (correct), seq 0, ack 3575780716, win 0, length 0
上面是tcpdump监测的数据包,下面是试图连接到本机服务器端的一个客户程序的输出。可以看到,在程序被中止后,字符被当做命令发送到shell了。
22:53:30@~/develop/unixnetwork$./tcpEcho.out 127.0.0.1hello,worldhello,worldhello,worldhello,worldthis is the last chance to exceed my limitedTerminated23:15:13@~/develop/unixnetwork$hello,worldhello,world: command not found23:15:13@~/develop/unixnetwork$this is the last chance to exceed my limitedNo command 'this' found, did you mean: Command 'thin' from package 'thin' (universe)this: command not found




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