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
170
171
172
173
|
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/time.h>
#include <time.h>
#include <inttypes.h>
#include <dirent.h>
#include <netlink.h>
#include <owner.h>
static char *pid2name(pid_t pid)
{
char procname[256], *prog;
FILE *fp;
int ret;
ret = snprintf(procname, sizeof(procname), "/proc/%lu/stat", (unsigned long)pid);
if (ret < 0 || ret > (int)sizeof(procname))
return NULL;
fp = fopen(procname, "r");
if (!fp)
return NULL;
ret = fscanf(fp, "%*u (%m[^)]", &prog);
fclose(fp);
if (ret == 1)
return prog;
return NULL;
}
static char *portid2name(pid_t pid, uint32_t portid, unsigned long inode)
{
const struct dirent *ent;
char procname[256];
DIR *dir;
int ret;
ret = snprintf(procname, sizeof(procname), "/proc/%lu/fd/", (unsigned long)pid);
if (ret < 0 || ret >= (int)sizeof(procname))
return NULL;
dir = opendir(procname);
if (!dir)
return NULL;
for (;;) {
unsigned long ino;
char tmp[128];
ssize_t rl;
ent = readdir(dir);
if (!ent)
break;
if (ent->d_type != DT_LNK)
continue;
ret = snprintf(procname, sizeof(procname), "/proc/%d/fd/%s",
pid, ent->d_name);
if (ret < 0 || ret >= (int)sizeof(procname))
continue;
rl = readlink(procname, tmp, sizeof(tmp));
if (rl <= 0 || rl > (ssize_t)sizeof(tmp))
continue;
tmp[rl] = 0;
ret = sscanf(tmp, "socket:[%lu]", &ino);
if (ret == 1 && ino == inode) {
closedir(dir);
return pid2name(pid);
}
}
closedir(dir);
return NULL;
}
static char *name_by_portid(uint32_t portid, unsigned long inode)
{
const struct dirent *ent;
char *prog;
DIR *dir;
/* Many netlink users use their process ID to allocate the first port id. */
prog = portid2name(portid, portid, inode);
if (prog)
return prog;
/* no luck, search harder. */
dir = opendir("/proc");
if (!dir)
return NULL;
for (;;) {
unsigned long pid;
char *end;
ent = readdir(dir);
if (!ent)
break;
if (ent->d_type != DT_DIR)
continue;
pid = strtoul(ent->d_name, &end, 10);
if (pid <= 1 || *end)
continue;
if (pid == portid) /* already tried */
continue;
prog = portid2name(pid, portid, inode);
if (prog)
break;
}
closedir(dir);
return prog;
}
char *get_progname(uint32_t portid)
{
FILE *fp = fopen("/proc/net/netlink", "r");
uint32_t portid_check;
unsigned long inode;
int ret, prot;
if (!fp)
return NULL;
for (;;) {
char line[256];
if (!fgets(line, sizeof(line), fp))
break;
ret = sscanf(line, "%*x %d %u %*x %*d %*d %*x %*d %*u %lu\n",
&prot, &portid_check, &inode);
if (ret == EOF)
break;
if (ret == 3 && portid_check == portid && prot == NETLINK_NETFILTER) {
static uint32_t last_portid;
static uint32_t last_inode;
static char *last_program;
char *prog;
fclose(fp);
if (last_portid == portid && last_inode == inode)
return last_program;
prog = name_by_portid(portid, inode);
free(last_program);
last_program = prog;
last_portid = portid;
last_inode = inode;
return prog;
}
}
fclose(fp);
return NULL;
}
|
