Commit | Line | Data |
---|---|---|
dc0d77d7 CE |
1 | #include <unistd.h> |
2 | #include "strerr.h" | |
3 | #include "buffer.h" | |
4 | #include "stralloc.h" | |
5 | #include "alloc.h" | |
6 | #include "dns.h" | |
7 | #include "ip4.h" | |
8 | #include "byte.h" | |
9 | #include "scan.h" | |
10 | #include "taia.h" | |
11 | #include "sgetopt.h" | |
12 | #include "iopause.h" | |
13 | #include "error.h" | |
14 | #include "exit.h" | |
15 | ||
16 | #define FATAL "dnsfilter: fatal: " | |
17 | ||
18 | void nomem(void) | |
19 | { | |
20 | strerr_die2x(111,FATAL,"out of memory"); | |
21 | } | |
22 | ||
23 | struct line { | |
24 | stralloc left; | |
25 | stralloc middle; | |
26 | stralloc right; | |
27 | struct dns_transmit dt; | |
28 | int flagactive; | |
29 | iopause_fd *io; | |
30 | } *x; | |
31 | struct line tmp; | |
32 | unsigned int xmax = 1000; | |
33 | unsigned int xnum = 0; | |
34 | unsigned int numactive = 0; | |
35 | unsigned int maxactive = 10; | |
36 | ||
37 | static stralloc partial; | |
38 | ||
39 | char inbuf[1024]; | |
40 | int inbuflen = 0; | |
41 | iopause_fd *inio; | |
42 | int flag0 = 1; | |
43 | ||
44 | iopause_fd *io; | |
45 | int iolen; | |
46 | ||
47 | char servers[64]; | |
48 | char ip[4]; | |
49 | char name[DNS_NAME4_DOMAIN]; | |
50 | ||
51 | void errout(int i) | |
52 | { | |
53 | int j; | |
54 | ||
55 | if (!stralloc_copys(&x[i].middle,":")) nomem(); | |
56 | if (!stralloc_cats(&x[i].middle,error_str(errno))) nomem(); | |
57 | for (j = 0;j < x[i].middle.len;++j) | |
58 | if (x[i].middle.s[j] == ' ') | |
59 | x[i].middle.s[j] = '-'; | |
60 | } | |
61 | ||
62 | int main(int argc,char **argv) | |
63 | { | |
64 | struct taia stamp; | |
65 | struct taia deadline; | |
66 | int opt; | |
67 | unsigned long u; | |
68 | int i; | |
69 | int j; | |
70 | int r; | |
71 | ||
72 | while ((opt = getopt(argc,argv,"c:l:")) != opteof) | |
73 | switch(opt) { | |
74 | case 'c': | |
75 | scan_ulong(optarg,&u); | |
76 | if (u < 1) u = 1; | |
77 | if (u > 1000) u = 1000; | |
78 | maxactive = u; | |
79 | break; | |
80 | case 'l': | |
81 | scan_ulong(optarg,&u); | |
82 | if (u < 1) u = 1; | |
83 | if (u > 1000000) u = 1000000; | |
84 | xmax = u; | |
85 | break; | |
86 | default: | |
87 | strerr_die1x(111,"dnsfilter: usage: dnsfilter [ -c concurrency ] [ -l lines ]"); | |
88 | } | |
89 | ||
90 | x = (struct line *) alloc(xmax * sizeof(struct line)); | |
91 | if (!x) nomem(); | |
92 | byte_zero(x,xmax * sizeof(struct line)); | |
93 | ||
94 | io = (iopause_fd *) alloc((xmax + 1) * sizeof(iopause_fd)); | |
95 | if (!io) nomem(); | |
96 | ||
97 | if (!stralloc_copys(&partial,"")) nomem(); | |
98 | ||
99 | ||
100 | while (flag0 || inbuflen || partial.len || xnum) { | |
101 | taia_now(&stamp); | |
102 | taia_uint(&deadline,120); | |
103 | taia_add(&deadline,&deadline,&stamp); | |
104 | ||
105 | iolen = 0; | |
106 | ||
107 | if (flag0) | |
108 | if (inbuflen < sizeof inbuf) { | |
109 | inio = io + iolen++; | |
110 | inio->fd = 0; | |
111 | inio->events = IOPAUSE_READ; | |
112 | } | |
113 | ||
114 | for (i = 0;i < xnum;++i) | |
115 | if (x[i].flagactive) { | |
116 | x[i].io = io + iolen++; | |
117 | dns_transmit_io(&x[i].dt,x[i].io,&deadline); | |
118 | } | |
119 | ||
120 | iopause(io,iolen,&deadline,&stamp); | |
121 | ||
122 | if (flag0) | |
123 | if (inbuflen < sizeof inbuf) | |
124 | if (inio->revents) { | |
125 | r = read(0,inbuf + inbuflen,(sizeof inbuf) - inbuflen); | |
126 | if (r <= 0) | |
127 | flag0 = 0; | |
128 | else | |
129 | inbuflen += r; | |
130 | } | |
131 | ||
132 | for (i = 0;i < xnum;++i) | |
133 | if (x[i].flagactive) { | |
134 | r = dns_transmit_get(&x[i].dt,x[i].io,&stamp); | |
135 | if (r == -1) { | |
136 | errout(i); | |
137 | x[i].flagactive = 0; | |
138 | --numactive; | |
139 | } | |
140 | else if (r == 1) { | |
141 | if (dns_name_packet(&x[i].middle,x[i].dt.packet,x[i].dt.packetlen) == -1) | |
142 | errout(i); | |
143 | if (x[i].middle.len) | |
144 | if (!stralloc_cats(&x[i].left,"=")) nomem(); | |
145 | x[i].flagactive = 0; | |
146 | --numactive; | |
147 | } | |
148 | } | |
149 | ||
150 | for (;;) { | |
151 | ||
152 | if (xnum && !x[0].flagactive) { | |
153 | buffer_put(buffer_1,x[0].left.s,x[0].left.len); | |
154 | buffer_put(buffer_1,x[0].middle.s,x[0].middle.len); | |
155 | buffer_put(buffer_1,x[0].right.s,x[0].right.len); | |
156 | buffer_flush(buffer_1); | |
157 | --xnum; | |
158 | tmp = x[0]; | |
159 | for (i = 0;i < xnum;++i) x[i] = x[i + 1]; | |
160 | x[xnum] = tmp; | |
161 | continue; | |
162 | } | |
163 | ||
164 | if ((xnum < xmax) && (numactive < maxactive)) { | |
165 | i = byte_chr(inbuf,inbuflen,'\n'); | |
166 | if (inbuflen && (i == inbuflen)) { | |
167 | if (!stralloc_catb(&partial,inbuf,inbuflen)) nomem(); | |
168 | inbuflen = 0; | |
169 | continue; | |
170 | } | |
171 | ||
172 | if ((i < inbuflen) || (!flag0 && partial.len)) { | |
173 | if (i < inbuflen) ++i; | |
174 | if (!stralloc_catb(&partial,inbuf,i)) nomem(); | |
175 | inbuflen -= i; | |
176 | for (j = 0;j < inbuflen;++j) inbuf[j] = inbuf[j + i]; | |
177 | ||
178 | if (partial.len) { | |
179 | i = byte_chr(partial.s,partial.len,'\n'); | |
180 | i = byte_chr(partial.s,i,'\t'); | |
181 | i = byte_chr(partial.s,i,' '); | |
182 | ||
183 | if (!stralloc_copyb(&x[xnum].left,partial.s,i)) nomem(); | |
184 | if (!stralloc_copys(&x[xnum].middle,"")) nomem(); | |
185 | if (!stralloc_copyb(&x[xnum].right,partial.s + i,partial.len - i)) nomem(); | |
186 | x[xnum].flagactive = 0; | |
187 | ||
188 | partial.len = i; | |
189 | if (!stralloc_0(&partial)) nomem(); | |
190 | if (ip4_scan(partial.s,ip)) { | |
191 | dns_name4_domain(name,ip); | |
192 | if (dns_resolvconfip(servers) == -1) | |
193 | strerr_die2sys(111,FATAL,"unable to read /etc/resolv.conf: "); | |
194 | if (dns_transmit_start(&x[xnum].dt,servers,1,name,DNS_T_PTR,"\0\0\0\0") == -1) | |
195 | errout(xnum); | |
196 | else { | |
197 | x[xnum].flagactive = 1; | |
198 | ++numactive; | |
199 | } | |
200 | } | |
201 | ++xnum; | |
202 | } | |
203 | ||
204 | partial.len = 0; | |
205 | continue; | |
206 | } | |
207 | } | |
208 | ||
209 | break; | |
210 | } | |
211 | } | |
212 | ||
213 | _exit(0); | |
214 | } |