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
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
|
#include <sys/types.h>
#if !defined(__OpenBSD__)
#define __USE_GNU
#define _GNU_SOURCE
#endif
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <err.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#include <pwd.h>
#include <grp.h>
#include <string.h>
#include <dlfcn.h>
#include <dirent.h>
#include <signal.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include "libglouglou.h"
/*
* Various utils
*/
void *
xmalloc(size_t size)
{
void *data;
data = malloc(size);
if (!data)
err(1, "could not malloc %d", (int)size);
return data;
}
void *
xcalloc(size_t nmemb, size_t size)
{
void *data;
data = calloc(nmemb, size);
if (!data)
err(1, "could not calloc %d", (int)size);
return data;
}
void
fd_nonblock(int fd)
{
int flags = fcntl(fd, F_GETFL, 0);
int rc = fcntl(fd, F_SETFL, flags | O_NONBLOCK);
if (rc == -1)
err(1, "failed to set fd %i non-blocking", fd);
}
void
addrcpy(struct sockaddr_in *dst, struct sockaddr_in *src)
{
dst->sin_addr.s_addr = src->sin_addr.s_addr;
dst->sin_port = src->sin_port;
dst->sin_family = src->sin_family;
}
int
addrcmp(struct sockaddr_in *a, struct sockaddr_in *b)
{
if (a->sin_addr.s_addr != b->sin_addr.s_addr)
return -1;
if (a->sin_port != b->sin_port)
return -2;
if (a->sin_family != b->sin_family)
return -3;
return 0;
}
void
droppriv(char *user, int do_chroot, char *chroot_path)
{
struct passwd *pw;
pw = getpwnam(user);
if (!pw)
err(1, "unknown user %s", user);
if (do_chroot) {
if (!chroot_path)
chroot_path = pw->pw_dir;
if (chroot(chroot_path) != 0)
err(1, "unable to chroot");
}
if (chdir("/") != 0)
err(1, "unable to chdir");
if (setgroups(1, &pw->pw_gid) == -1)
err(1, "setgroups() failed");
if (setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) == -1)
err(1, "setresgid failed");
if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) == -1)
err(1, "setresuid() failed");
endpwent();
}
/* Loads modules from path and returns a list of handles */
struct modules *
modules_load(char *path, char *check_sym) {
struct modules *modules;
struct mod *mod;
DIR *d;
struct dirent *ent;
int n;
void *handle, *sym;
modules = xcalloc(1, sizeof(struct modules));
d = opendir(path);
if (!d)
goto err;
while ((ent = readdir(d))) {
n = strnlen(ent->d_name, sizeof(ent->d_name));
if (!n)
continue;
handle = dlopen(ent->d_name, RTLD_LAZY);
if (!handle)
continue;
dlerror(); // clear errors
if (check_sym) {
sym = dlsym(handle, check_sym);
if (!sym)
continue;
dlerror(); // clear errors
}
mod = xcalloc(1, sizeof(struct mod));
mod->handle = handle;
LIST_INSERT_HEAD(&modules->list, mod, entry);
modules->count++;
}
closedir(d);
return modules;
err:
free(modules);
return NULL;
}
/* pipe cmd1 stdout in cmd2 stdin
* return only on error (execve cmd2) */
int
exec_pipe(char *cmd1, char **cmd1_args, char **cmd1_env,
char *cmd2, char **cmd2_args, char **cmd2_env)
{
int pfd[2];
pipe(pfd);
if(fork() == 0)
{
dup2(pfd[1], 1);
close(pfd[0]);
close(pfd[1]);
execve(cmd1, cmd1_args, cmd1_env);
perror("execve");
exit(0);
}
dup2(pfd[0], 0);
close(pfd[0]);
close(pfd[1]);
execve(cmd2, cmd2_args, cmd2_env);
perror("execve");
return -1;
}
void
kill_wait(pid_t pid, int seconds) {
int i;
kill(pid, SIGTERM);
for(i=0; i<10; i++) {
if (waitpid(pid, NULL, WNOHANG) == -1)
return;
sleep(1);
}
log_warn("timeout SIGTERM %d, sending SIGKILL", pid);
kill(pid, SIGKILL);
sleep(1);
}
struct event *
tcp_server_create(struct event_base *evb, struct addr *ip, int port, event_callback_fn cb_conn, void *cb_conn_data)
{
int s = -1;
struct sockaddr_in sock_addr;
struct event *ev = NULL;
int sock_on = 1;
s = socket(AF_INET, SOCK_STREAM, 0);
if (s < 0)
goto err;
setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
&sock_on, sizeof(sock_on));
fd_nonblock(s);
bzero(&sock_addr, sizeof(sock_addr));
addr_ntos(ip, (struct sockaddr *)&sock_addr);
sock_addr.sin_port = htons(port);
if (bind(s, (struct sockaddr *)&sock_addr,
sizeof(sock_addr)) != 0)
goto err;
ev = event_new(evb, s, EV_READ|EV_PERSIST, cb_conn, cb_conn_data);
event_add(ev, NULL);
return ev;
err:
if (s != -1)
close(s);
if (ev)
event_del(ev);
return NULL;
}
struct event *
udp_server_create(struct event_base *evb, struct addr *ip, int port, event_callback_fn cb_srv, void *cb_srv_data)
{
int s = -1;
struct sockaddr_in sock_addr;
struct event *ev = NULL;
int sock_on = 1;
s = socket(AF_INET, SOCK_STREAM, 0);
if (s < 0)
goto err;
setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
&sock_on, sizeof(sock_on));
fd_nonblock(s);
bzero(&sock_addr, sizeof(sock_addr));
addr_ntos(ip, (struct sockaddr *)&sock_addr);
sock_addr.sin_port = htons(port);
if (bind(s, (struct sockaddr *)&sock_addr,
sizeof(sock_addr)) != 0)
goto err;
ev = event_new(evb, s, EV_READ|EV_PERSIST, cb_srv, cb_srv_data);
event_add(ev, NULL);
return ev;
err:
if (s != -1)
close(s);
if (ev)
event_del(ev);
return NULL;
}
|
