1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
/* ISC license. */
#include <skalibs/uint16.h>
#include <skalibs/uint32.h>
#include <skalibs/uint.h>
#include <skalibs/bytestr.h>
#include <skalibs/fmtscan.h>
#include <skalibs/buffer.h>
#include <skalibs/stralloc.h>
#include <skalibs/djbunix.h>
#include <skalibs/ip46.h>
#include <skalibs/skamisc.h>
#include "mgetuid.h"
#ifdef DEBUG
#include <skalibs/strerr2.h>
#define bug(a) do { strerr_warn4x("bug parsing ", a, "remaining: ", cur) ; return 0 ; } while (0)
#else
#define bug(a) return 0
#endif
#define LINESIZE 256
static int skipspace (char **s)
{
while (**s && ((**s == ' ') || (**s == '\t')))
(*s)++ ;
return (int)**s ;
}
static int parseline (char *s, unsigned int len, unsigned int *u, char *la, uint16 *lp, char *ra, uint16 *rp, int is6)
{
char *cur = s ;
unsigned int pos ;
uint32 junk ;
register unsigned int iplen = is6 ? 16 : 4 ;
if (!skipspace(&cur)) bug("initial whitespace") ;
pos = uint32_scan(cur, &junk) ; /* sl */
if (!pos || (cur-s+1+pos) > len) bug("sl") ;
cur += pos ;
if ((*cur++) != ':') bug("sl:") ;
if (!skipspace(&cur)) bug("sl: SPACE") ;
if ((cur - s + 1 + iplen) > len) bug("local_address") ;
pos = ucharn_scan(cur, la, iplen) ; /* local_address */
if (!pos) bug("local_address") ;
cur += pos ;
if ((*cur++) != ':') bug("local_address:") ;
pos = uint16_xscan(cur, lp) ; /* :port */
if (!pos || (cur-s+pos) > len) bug("local_port") ;
cur += pos ;
if (!skipspace(&cur)) bug("local_port SPACE") ;
if ((cur - s + 1 + iplen) > len) bug("remote_address") ;
pos = ucharn_scan(cur, ra, iplen) ; /* remote_address */
if (!pos) bug("remote_address") ;
cur += pos ;
if ((*cur++) != ':') bug("remote_address:") ;
pos = uint16_xscan(cur, rp) ; /* :port */
if (!pos || (cur-s+pos) > len) bug("remote_port") ;
cur += pos ;
if (!skipspace(&cur)) bug("remote_port SPACE");
pos = uint32_xscan(cur, &junk) ; /* st */
if (!pos || (cur-s+pos) > len) bug("st") ;
cur += pos ;
if (!skipspace(&cur)) bug("st SPACE") ;
pos = uint32_xscan(cur, &junk) ; /* tx_queue */
if (!pos || (cur-s+1+pos) > len) bug("tx_queue") ;
cur += pos ;
if ((*cur++) != ':') bug("tx_queue:") ;
pos = uint32_xscan(cur, &junk) ; /* rx_queue */
if (!pos || (cur-s+pos) > len) bug("rx_queue") ;
cur += pos ;
if (!skipspace(&cur)) bug("rx_queue SPACE") ;
pos = uint32_xscan(cur, &junk) ; /* tr */
if (!pos || (cur-s+1+pos) > len) bug("tr") ;
cur += pos ;
if ((*cur++) != ':') bug("tr:") ;
pos = uint32_xscan(cur, &junk) ; /* tm->when */
if (!pos || (cur-s+pos) > len) bug("tm->when") ;
cur += pos ;
if (!skipspace(&cur)) bug("tm->when SPACE") ;
pos = uint32_xscan(cur, &junk) ; /* retrnsmt */
if (!pos || (cur-s+pos) > len) bug("retrnsmt") ;
cur += pos ;
if (!skipspace(&cur)) bug("retrnsmt SPACE") ;
pos = uint_scan(cur, u) ; /* uid */
if (!pos || (cur-s+1+pos) > len) bug("uid") ;
return 1 ;
}
#ifdef DEBUG
static void debuglog (uint16 a, uint16 b, unsigned int c, char const *d, char const *e, int is6)
{
char sa[UINT16_FMT] ;
char sb[UINT16_FMT] ;
char sc[UINT_FMT] ;
char sd[IP46_FMT] ;
char se[IP46_FMT] ;
sa[uint16_fmt(sa, a)] = 0 ;
sb[uint16_fmt(sb, b)] = 0 ;
sc[uint_fmt(sc, c)] = 0 ;
sd[is6 ? ip6_fmt(sd, d) : ip4_fmt(sd, d)] = 0 ;
se[is6 ? ip6_fmt(se, e) : ip4_fmt(se, e)] = 0 ;
buffer_puts(buffer_2, sd) ;
buffer_puts(buffer_2, ":") ;
buffer_puts(buffer_2, sa) ;
buffer_puts(buffer_2, " , ") ;
buffer_puts(buffer_2, se) ;
buffer_puts(buffer_2, ":") ;
buffer_puts(buffer_2, sb) ;
buffer_puts(buffer_2, " -> ") ;
buffer_puts(buffer_2, sc) ;
buffer_putsflush(buffer_2, "\n") ;
}
#endif
int mgetuid (ip46_t const *localaddr, uint16 localport, ip46_t const *remoteaddr, uint16 remoteport)
{
int r ;
int u = -2 ;
stralloc line = STRALLOC_ZERO ;
buffer b ;
char y[BUFFER_INSIZE] ;
register int is6 = ip46_is6(localaddr) ;
int fd = open_readb(is6 ? "/proc/net/tcp6" : "/proc/net/tcp") ;
if (fd == -1) return -2 ;
buffer_init(&b, &buffer_read, fd, y, BUFFER_INSIZE_SMALL) ;
if (skagetln(&b, &line, '\n') < 1) goto err ;
#ifdef DEBUG
line.s[line.len-1] = 0 ;
debuglog(localport, remoteport, 65535, localaddr->ip, remoteaddr->ip, is6) ;
#endif
for (;;)
{
char la[16] ;
char ra[16] ;
unsigned int nu ;
uint16 lp, rp ;
line.len = 0 ;
r = skagetln(&b, &line, '\n') ;
if (r <= 0) { u = -1 ; break ; }
line.s[line.len-1] = 0 ;
if (!parseline(line.s, line.len, &nu, la, &lp, ra, &rp, is6)) break ;
#ifdef DEBUG
debuglog(lp, rp, nu, la, ra, is6) ;
#endif
if ((lp == localport) && (rp == remoteport)
&& !byte_diff(la, is6 ? 16 : 4, localaddr->ip)
&& !byte_diff(ra, is6 ? 16 : 4, remoteaddr->ip))
{
u = nu ; break ;
}
}
stralloc_free(&line) ;
err:
fd_close(fd) ;
return u ;
}
|
