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1.1 root 1: #include <sys/types.h>
2: #include <sys/types.h>
3: #include <sys/stat.h>
4: #include <sys/inet/in.h>
5: #include <stdio.h>
6: #include <ctype.h>
7:
8:
9: struct namefile {
10: char *name;
11: char *data;
12: long time;
13: };
14:
15: static struct namefile files[] = {
16: { "/tmp/networks", 0, 0 },
17: { 0, 0, 0},
18: };
19:
20: struct hash {
21: struct hash *next;
22: in_addr addr;
23: char *name;
24: };
25:
26: #define HSIZE 1023
27: static struct hash ht[HSIZE];
28:
29: /* imported */
30: extern char *in_getw();
31: extern char *malloc();
32:
33: /* exported */
34: int in_host_dostat=1;
35:
36: static int
37: getfile(i)
38: int i;
39: {
40: int fd;
41: struct stat sbuf;
42: unsigned int x;
43:
44: if (in_host_dostat)
45: stat(files[i].name, &sbuf);
46: else
47: sbuf.st_mtime = files[i].time;
48: if (files[i].data == 0 || sbuf.st_mtime>files[i].time) {
49: if (!in_host_dostat)
50: stat(files[i].name, &sbuf);
51: fd = open(files[i].name, 0);
52: if (fd<0)
53: return -1;
54: if (files[i].data!=0)
55: free(files[i].data);
56: x = sbuf.st_size;
57: files[i].data = malloc(x+2);
58: if (files[i].data==0) {
59: close(fd);
60: return -1;
61: }
62: if (read(fd, files[i].data, x)!=x){
63: close(fd);
64: return -1;
65: }
66: close(fd);
67: files[i].data[sbuf.st_size] = '\n';
68: files[i].data[sbuf.st_size+1] = 0;
69: files[i].time = sbuf.st_mtime;
70: for (i=0; i<HSIZE; i++)
71: ht[i].addr = 0;
72: }
73: return 0;
74: }
75:
76: #define SKIPWHITE while(*p==' ' || *p=='\t') p++
77: #define GETBLACK xp = b;\
78: while(*p!=' ' && *p!='\t' && *p!='\n' && *p!='\0')\
79: *xp++ = *p++;\
80: *xp = '\0'
81:
82: char *
83: in_host(addr)
84: in_addr addr;
85: {
86: register char *p, *xp;
87: unsigned char *yp;
88: static char b[32];
89: int i;
90: in_addr x, in_netof(), in_aton();
91:
92: if (addr==0)
93: return "*";
94: i = addr==in_netof(addr) ? 0 : 1;
95: if (getfile(i) < 0) {
96: perror(files[i].name);
97: } else if (addr == ht[addr%HSIZE].addr) {
98: p = ht[addr%HSIZE].name;
99: GETBLACK;
100: return(b);
101: } else for (p = files[i].data; *p; p++){
102: /* get number */
103: SKIPWHITE;
104: GETBLACK;
105: x = in_aton(b);
106: SKIPWHITE;
107: if (x != 0 && *p != '\n') {
108: /* get name & insert into hash table */
109: i = x%HSIZE;
110: ht[i].addr = x;
111: ht[i].name = p;
112: GETBLACK;
113:
114: /* see if this is the one */
115: if (x==addr)
116: return b;
117: }
118: /* drop rest of line */
119: while(*p!='\n'&&*p!='\0') p++;
120: }
121: yp = (unsigned char *) &addr;
122: sprintf(b, "%d.%d.%d.%d", yp[3], yp[2], yp[1], yp[0]);
123: return(b);
124: }
125:
126: main()
127: {
128: in_addr net, addr, onet;
129: char line[128];
130: char *name, *cp;
131:
132: onet = -1;
133: while(gets(line)!=NULL) {
134: /* comments */
135: if (line[0]=='#'||line[0]=='\n' || line[0]==' ' || line[0]=='\t'){
136: puts(line);
137: continue;
138: }
139:
140: /* get addr and net */
141: for (name=line; *name&&*name!=' '&&*name!='\t'; name++)
142: ;
143: if (*name=='\0')
144: continue;
145: *name++ = '\0';
146: if ((addr=in_aton(line))==0 || (net=in_netof(addr))==0) {
147: printf("%s %s\n", line, name);
148: continue;
149: }
150: if (net!=onet) {
151: onet = net;
152: printf("%s %s\n", in_ntoa(net), in_host(net));
153: }
154:
155: /* get name */
156: for (; *name==' '||*name=='\t'; name++)
157: ;
158: if (*name=='\0')
159: continue;
160: for (cp=name; *cp&&*cp!=' '&&*cp!='\t'; cp++)
161: ;
162: if (*cp!='\0')
163: *cp++ = '\0';
164:
165: /* print out both addresses */
166: printf("%s %s/%s %s %s\n", line, in_host(net),name,name,cp);
167: }
168: }
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