| 1 | #include "tcpto.h" |
| 2 | #include "open.h" |
| 3 | #include "lock.h" |
| 4 | #include "seek.h" |
| 5 | #include "now.h" |
| 6 | #include "ip.h" |
| 7 | #include "byte.h" |
| 8 | #include "datetime.h" |
| 9 | #include "readwrite.h" |
| 10 | |
| 11 | char tcpto_buf[1024]; |
| 12 | |
| 13 | static int flagwasthere; |
| 14 | static int fdlock; |
| 15 | |
| 16 | static int getbuf() |
| 17 | { |
| 18 | int r; |
| 19 | int fd; |
| 20 | |
| 21 | fdlock = open_write("queue/lock/tcpto"); |
| 22 | if (fdlock == -1) return 0; |
| 23 | fd = open_read("queue/lock/tcpto"); |
| 24 | if (fd == -1) { close(fdlock); return 0; } |
| 25 | if (lock_ex(fdlock) == -1) { close(fdlock); close(fd); return 0; } |
| 26 | r = read(fd,tcpto_buf,sizeof(tcpto_buf)); |
| 27 | close(fd); |
| 28 | if (r < 0) { close(fdlock); return 0; } |
| 29 | r >>= 4; |
| 30 | if (!r) close(fdlock); |
| 31 | return r; |
| 32 | } |
| 33 | |
| 34 | int tcpto(ip) struct ip_address *ip; |
| 35 | { |
| 36 | int n; |
| 37 | int i; |
| 38 | char *record; |
| 39 | datetime_sec when; |
| 40 | |
| 41 | flagwasthere = 0; |
| 42 | |
| 43 | n = getbuf(); |
| 44 | if (!n) return 0; |
| 45 | close(fdlock); |
| 46 | |
| 47 | record = tcpto_buf; |
| 48 | for (i = 0;i < n;++i) |
| 49 | { |
| 50 | if (byte_equal(ip->d,4,record)) |
| 51 | { |
| 52 | flagwasthere = 1; |
| 53 | if (record[4] >= 2) |
| 54 | { |
| 55 | when = (unsigned long) (unsigned char) record[11]; |
| 56 | when = (when << 8) + (unsigned long) (unsigned char) record[10]; |
| 57 | when = (when << 8) + (unsigned long) (unsigned char) record[9]; |
| 58 | when = (when << 8) + (unsigned long) (unsigned char) record[8]; |
| 59 | |
| 60 | if (now() - when < ((60 + (getpid() & 31)) << 6)) |
| 61 | return 1; |
| 62 | } |
| 63 | return 0; |
| 64 | } |
| 65 | record += 16; |
| 66 | } |
| 67 | return 0; |
| 68 | } |
| 69 | |
| 70 | void tcpto_err(ip,flagerr) struct ip_address *ip; int flagerr; |
| 71 | { |
| 72 | int n; |
| 73 | int i; |
| 74 | char *record; |
| 75 | datetime_sec when; |
| 76 | datetime_sec firstwhen; |
| 77 | int firstpos; |
| 78 | datetime_sec lastwhen; |
| 79 | |
| 80 | if (!flagerr) |
| 81 | if (!flagwasthere) |
| 82 | return; /* could have been added, but not worth the effort to check */ |
| 83 | |
| 84 | n = getbuf(); |
| 85 | if (!n) return; |
| 86 | |
| 87 | record = tcpto_buf; |
| 88 | for (i = 0;i < n;++i) |
| 89 | { |
| 90 | if (byte_equal(ip->d,4,record)) |
| 91 | { |
| 92 | if (!flagerr) |
| 93 | record[4] = 0; |
| 94 | else |
| 95 | { |
| 96 | lastwhen = (unsigned long) (unsigned char) record[11]; |
| 97 | lastwhen = (lastwhen << 8) + (unsigned long) (unsigned char) record[10]; |
| 98 | lastwhen = (lastwhen << 8) + (unsigned long) (unsigned char) record[9]; |
| 99 | lastwhen = (lastwhen << 8) + (unsigned long) (unsigned char) record[8]; |
| 100 | when = now(); |
| 101 | |
| 102 | if (record[4] && (when < 120 + lastwhen)) { close(fdlock); return; } |
| 103 | |
| 104 | if (++record[4] > 10) record[4] = 10; |
| 105 | record[8] = when; when >>= 8; |
| 106 | record[9] = when; when >>= 8; |
| 107 | record[10] = when; when >>= 8; |
| 108 | record[11] = when; |
| 109 | } |
| 110 | if (seek_set(fdlock,i << 4) == 0) |
| 111 | if (write(fdlock,record,16) < 16) |
| 112 | ; /*XXX*/ |
| 113 | close(fdlock); |
| 114 | return; |
| 115 | } |
| 116 | record += 16; |
| 117 | } |
| 118 | |
| 119 | if (!flagerr) { close(fdlock); return; } |
| 120 | |
| 121 | record = tcpto_buf; |
| 122 | for (i = 0;i < n;++i) |
| 123 | { |
| 124 | if (!record[4]) break; |
| 125 | record += 16; |
| 126 | } |
| 127 | |
| 128 | if (i >= n) |
| 129 | { |
| 130 | firstpos = -1; |
| 131 | record = tcpto_buf; |
| 132 | for (i = 0;i < n;++i) |
| 133 | { |
| 134 | when = (unsigned long) (unsigned char) record[11]; |
| 135 | when = (when << 8) + (unsigned long) (unsigned char) record[10]; |
| 136 | when = (when << 8) + (unsigned long) (unsigned char) record[9]; |
| 137 | when = (when << 8) + (unsigned long) (unsigned char) record[8]; |
| 138 | when += (record[4] << 10); |
| 139 | if ((firstpos < 0) || (when < firstwhen)) |
| 140 | { |
| 141 | firstpos = i; |
| 142 | firstwhen = when; |
| 143 | } |
| 144 | record += 16; |
| 145 | } |
| 146 | i = firstpos; |
| 147 | } |
| 148 | |
| 149 | if (i >= 0) |
| 150 | { |
| 151 | record = tcpto_buf + (i << 4); |
| 152 | byte_copy(record,4,ip->d); |
| 153 | when = now(); |
| 154 | record[8] = when; when >>= 8; |
| 155 | record[9] = when; when >>= 8; |
| 156 | record[10] = when; when >>= 8; |
| 157 | record[11] = when; |
| 158 | record[4] = 1; |
| 159 | if (seek_set(fdlock,i << 4) == 0) |
| 160 | if (write(fdlock,record,16) < 16) |
| 161 | ; /*XXX*/ |
| 162 | } |
| 163 | |
| 164 | close(fdlock); |
| 165 | } |