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897522ea EP |
1 | /* |
2 | * ucon.c | |
3 | * | |
4 | * Copyright (c) 2004+ Evgeniy Polyakov <johnpol@2ka.mipt.ru> | |
5 | * | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | */ | |
21 | ||
22 | #include <asm/types.h> | |
23 | ||
24 | #include <sys/types.h> | |
25 | #include <sys/socket.h> | |
26 | #include <sys/poll.h> | |
27 | ||
28 | #include <linux/netlink.h> | |
29 | #include <linux/rtnetlink.h> | |
30 | ||
31 | #include <arpa/inet.h> | |
32 | ||
33 | #include <stdio.h> | |
34 | #include <stdlib.h> | |
35 | #include <unistd.h> | |
36 | #include <string.h> | |
37 | #include <errno.h> | |
38 | #include <time.h> | |
39 | ||
40 | #include <linux/connector.h> | |
41 | ||
42 | #define DEBUG | |
43 | #define NETLINK_CONNECTOR 11 | |
44 | ||
45 | #ifdef DEBUG | |
46 | #define ulog(f, a...) fprintf(stdout, f, ##a) | |
47 | #else | |
48 | #define ulog(f, a...) do {} while (0) | |
49 | #endif | |
50 | ||
51 | static int need_exit; | |
52 | static __u32 seq; | |
53 | ||
54 | static int netlink_send(int s, struct cn_msg *msg) | |
55 | { | |
56 | struct nlmsghdr *nlh; | |
57 | unsigned int size; | |
58 | int err; | |
59 | char buf[128]; | |
60 | struct cn_msg *m; | |
61 | ||
62 | size = NLMSG_SPACE(sizeof(struct cn_msg) + msg->len); | |
63 | ||
64 | nlh = (struct nlmsghdr *)buf; | |
65 | nlh->nlmsg_seq = seq++; | |
66 | nlh->nlmsg_pid = getpid(); | |
67 | nlh->nlmsg_type = NLMSG_DONE; | |
68 | nlh->nlmsg_len = NLMSG_LENGTH(size - sizeof(*nlh)); | |
69 | nlh->nlmsg_flags = 0; | |
70 | ||
71 | m = NLMSG_DATA(nlh); | |
72 | #if 0 | |
73 | ulog("%s: [%08x.%08x] len=%u, seq=%u, ack=%u.\n", | |
74 | __func__, msg->id.idx, msg->id.val, msg->len, msg->seq, msg->ack); | |
75 | #endif | |
76 | memcpy(m, msg, sizeof(*m) + msg->len); | |
77 | ||
78 | err = send(s, nlh, size, 0); | |
79 | if (err == -1) | |
80 | ulog("Failed to send: %s [%d].\n", | |
81 | strerror(errno), errno); | |
82 | ||
83 | return err; | |
84 | } | |
85 | ||
86 | int main(int argc, char *argv[]) | |
87 | { | |
88 | int s; | |
89 | char buf[1024]; | |
90 | int len; | |
91 | struct nlmsghdr *reply; | |
92 | struct sockaddr_nl l_local; | |
93 | struct cn_msg *data; | |
94 | FILE *out; | |
95 | time_t tm; | |
96 | struct pollfd pfd; | |
97 | ||
98 | if (argc < 2) | |
99 | out = stdout; | |
100 | else { | |
101 | out = fopen(argv[1], "a+"); | |
102 | if (!out) { | |
103 | ulog("Unable to open %s for writing: %s\n", | |
104 | argv[1], strerror(errno)); | |
105 | out = stdout; | |
106 | } | |
107 | } | |
108 | ||
109 | memset(buf, 0, sizeof(buf)); | |
110 | ||
111 | s = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR); | |
112 | if (s == -1) { | |
113 | perror("socket"); | |
114 | return -1; | |
115 | } | |
116 | ||
117 | l_local.nl_family = AF_NETLINK; | |
118 | l_local.nl_groups = 0x123; /* bitmask of requested groups */ | |
119 | l_local.nl_pid = 0; | |
120 | ||
121 | if (bind(s, (struct sockaddr *)&l_local, sizeof(struct sockaddr_nl)) == -1) { | |
122 | perror("bind"); | |
123 | close(s); | |
124 | return -1; | |
125 | } | |
126 | ||
127 | #if 0 | |
128 | { | |
129 | int on = 0x57; /* Additional group number */ | |
130 | setsockopt(s, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP, &on, sizeof(on)); | |
131 | } | |
132 | #endif | |
133 | if (0) { | |
134 | int i, j; | |
135 | ||
136 | memset(buf, 0, sizeof(buf)); | |
137 | ||
138 | data = (struct cn_msg *)buf; | |
139 | ||
140 | data->id.idx = 0x123; | |
141 | data->id.val = 0x456; | |
142 | data->seq = seq++; | |
143 | data->ack = 0; | |
144 | data->len = 0; | |
145 | ||
146 | for (j=0; j<10; ++j) { | |
147 | for (i=0; i<1000; ++i) { | |
148 | len = netlink_send(s, data); | |
149 | } | |
150 | ||
151 | ulog("%d messages have been sent to %08x.%08x.\n", i, data->id.idx, data->id.val); | |
152 | } | |
153 | ||
154 | return 0; | |
155 | } | |
156 | ||
157 | ||
158 | pfd.fd = s; | |
159 | ||
160 | while (!need_exit) { | |
161 | pfd.events = POLLIN; | |
162 | pfd.revents = 0; | |
163 | switch (poll(&pfd, 1, -1)) { | |
164 | case 0: | |
165 | need_exit = 1; | |
166 | break; | |
167 | case -1: | |
168 | if (errno != EINTR) { | |
169 | need_exit = 1; | |
170 | break; | |
171 | } | |
172 | continue; | |
173 | } | |
174 | if (need_exit) | |
175 | break; | |
176 | ||
177 | memset(buf, 0, sizeof(buf)); | |
178 | len = recv(s, buf, sizeof(buf), 0); | |
179 | if (len == -1) { | |
180 | perror("recv buf"); | |
181 | close(s); | |
182 | return -1; | |
183 | } | |
184 | reply = (struct nlmsghdr *)buf; | |
185 | ||
186 | switch (reply->nlmsg_type) { | |
187 | case NLMSG_ERROR: | |
188 | fprintf(out, "Error message received.\n"); | |
189 | fflush(out); | |
190 | break; | |
191 | case NLMSG_DONE: | |
192 | data = (struct cn_msg *)NLMSG_DATA(reply); | |
193 | ||
194 | time(&tm); | |
195 | fprintf(out, "%.24s : [%x.%x] [%08u.%08u].\n", | |
196 | ctime(&tm), data->id.idx, data->id.val, data->seq, data->ack); | |
197 | fflush(out); | |
198 | break; | |
199 | default: | |
200 | break; | |
201 | } | |
202 | } | |
203 | ||
204 | close(s); | |
205 | return 0; | |
206 | } |