path: root/jni/src/pppoe_wrapper.c (plain)
blob: 8cf721fc3eed673bfa496bcd5423b0bf7789e024

1	#include <stdio.h>
2	#include <ctype.h>
3	#include <stdlib.h>
4	#include <string.h>
5	#include <unistd.h>
6	#include <signal.h>
7	#include <errno.h>
8	#include <fcntl.h>
9	#include <syslog.h>
10	#include <netdb.h>
11	#include <utmp.h>
12	#include <pwd.h>
13	#include <setjmp.h>
14	#include <sys/param.h>
15	#include <sys/types.h>
16	#include <sys/wait.h>
17	#include <sys/time.h>
18	#include <sys/resource.h>
19	#include <sys/stat.h>
20	#include <sys/socket.h>
21	#include <netinet/in.h>
22	#include <arpa/inet.h>
23	#include <cutils/properties.h>
24	#include <sys/un.h>
25
26	#include <android/log.h>
27
28	#include "pppoe_ctrl.h"
29
30	#define LOCAL_TAG "PPPOE_WRAPPER"
31
32	#define PPP_CMD_LEN_MAX 512
33
34	static char ppp_cmd[PPP_CMD_LEN_MAX];
35
36
37	static pid_t read_pid(const char *pidfile)
38	{
39	FILE *fp;
40	pid_t pid;
41
42	if ((fp = fopen(pidfile, "r")) == NULL) {
43	__android_log_print(ANDROID_LOG_ERROR, LOCAL_TAG,
44	"failed to open %s (%s)\n", pidfile, strerror(errno));
45	errno = ENOENT;
46	return 0;
47	}
48
49	if (fscanf(fp, "%d", &pid) != 1) {
50	__android_log_print(ANDROID_LOG_ERROR, LOCAL_TAG,
51	"failed to read pid, make pid as 0\n");
52	pid = 0;
53	}
54	fclose(fp);
55
56	__android_log_print(ANDROID_LOG_INFO, LOCAL_TAG,
57	"read_pid: %d\n", pid);
58
59	return pid;
60	}
61
62	static int ppp_stop()
63	{
64	pid_t pid;
65	int ret;
66
67	pid = read_pid(PPPOE_PIDFILE);
68	if ( 0 == pid ) {
69	__android_log_print(ANDROID_LOG_ERROR, LOCAL_TAG,
70	"failed to stop ppp for no pid got\n" );
71	return -1;
72	}
73
74	ret = kill(pid, 0);
75	if ( 0 != ret ) {
76	__android_log_print(ANDROID_LOG_ERROR, LOCAL_TAG,
77	"process(#%d) died already???\n", pid );
78	return -1;
79	}
80
81	/*
82	The signals SIGKILL and SIGSTOP cannot
83	be caught, blocked, or ignored.
84	So send SIGUSR1 to notify pppoe to send PADT.
85	*/
86	ret = kill(pid, SIGUSR1);
87	__android_log_print(ANDROID_LOG_INFO, LOCAL_TAG,
88	"Send SIGUSR1 to pid(#%d), ret = %d\n", pid, ret );
89
90	/*
91	If no sleep before send SIGKILL, pppoe will just being killed
92	rather than sending PADT.
93	*/
94	__android_log_print(ANDROID_LOG_INFO, LOCAL_TAG,
95	"sleep before send SIGKILL to pid(#%d)\n", pid );
96
97	sleep(5);
98
99	ret = kill(pid, SIGKILL);
100	__android_log_print(ANDROID_LOG_INFO, LOCAL_TAG,
101	"Send SIGKILL to pid(#%d), ret = %d\n", pid, ret );
102
103	unlink(PPPOE_PIDFILE);
104	__android_log_print(ANDROID_LOG_INFO, LOCAL_TAG,
105	"removed %s\n", PPPOE_PIDFILE );
106
107	return 0;
108	}
109
110
111	int main(int argc, char * argv[])
112	{
113	int socket_fd;
114	struct sockaddr_un name;
115	int i, len;
116	int ppp_cmd_len;
117
118	socket_fd = socket(PF_UNIX, SOCK_DGRAM, 0);
119	if (socket_fd < 0) {
120	__android_log_print(ANDROID_LOG_ERROR, LOCAL_TAG,
121	"failed to create socket(%s)\n", strerror(errno));
122	exit(-1);
123	}
124
125	memset(&name,0,sizeof(name));
126	__android_log_print(ANDROID_LOG_INFO, LOCAL_TAG,
127	"create AF_UNIX socket:%d OK\n",socket_fd);
128
129	unlink("/dev/socket/pppd");
130	name.sun_family = AF_UNIX;
131	strncpy(name.sun_path, "/dev/socket/pppd", sizeof(name.sun_path) - 1);
132
133	if (bind(socket_fd, (struct sockaddr *)&name, sizeof(struct sockaddr_un)) < 0) {
134	__android_log_print(ANDROID_LOG_ERROR, LOCAL_TAG,
135	"failed to bind socket(%s)\n", strerror(errno));
136	exit(-1);
137	}
138
139	{
140	struct timeval tv;
141	int res;
142	fd_set rfds;
143
144	for (;;) {
145	tv.tv_sec = 10;
146	tv.tv_usec = 0;
147	FD_ZERO(&rfds);
148	FD_SET(socket_fd, &rfds);
149	res = select(socket_fd + 1, &rfds, NULL, NULL, &tv);
150	if (FD_ISSET(socket_fd, &rfds)) {
151	res = recv(socket_fd, ppp_cmd, PPP_CMD_LEN_MAX-1, 0);
152	if (res < 0)
153	return res;
154	ppp_cmd[res] = '\0';
155	ppp_cmd_len = res;
156	__android_log_print(ANDROID_LOG_INFO, LOCAL_TAG,
157	"recv cmd: [%s]\n",ppp_cmd);
158	if ( 0 == strcmp(ppp_cmd, "ppp-stop") ) {
159	ppp_stop();
160	}
161	else {
162	system(ppp_cmd);
163	}
164	}
165	}
166	}
167
168	__android_log_print(ANDROID_LOG_INFO, LOCAL_TAG, "EXIT\n");
169	close(socket_fd);
170	return 0;
171	}
172
173