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1 | /* |
2 | * ucon.c |
3 | * |
4 | * Copyright (c) 2004+ Evgeniy Polyakov <zbr@ioremap.net> |
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 <stdbool.h> |
34 | #include <stdio.h> |
35 | #include <stdlib.h> |
36 | #include <unistd.h> |
37 | #include <string.h> |
38 | #include <errno.h> |
39 | #include <time.h> |
40 | #include <getopt.h> |
41 | |
42 | #include <linux/connector.h> |
43 | |
44 | #define DEBUG |
45 | #define NETLINK_CONNECTOR 11 |
46 | |
47 | /* Hopefully your userspace connector.h matches this kernel */ |
48 | #define CN_TEST_IDX CN_NETLINK_USERS + 3 |
49 | #define CN_TEST_VAL 0x456 |
50 | |
51 | #ifdef DEBUG |
52 | #define ulog(f, a...) fprintf(stdout, f, ##a) |
53 | #else |
54 | #define ulog(f, a...) do {} while (0) |
55 | #endif |
56 | |
57 | static int need_exit; |
58 | static __u32 seq; |
59 | |
60 | static int netlink_send(int s, struct cn_msg *msg) |
61 | { |
62 | struct nlmsghdr *nlh; |
63 | unsigned int size; |
64 | int err; |
65 | char buf[128]; |
66 | struct cn_msg *m; |
67 | |
68 | size = NLMSG_SPACE(sizeof(struct cn_msg) + msg->len); |
69 | |
70 | nlh = (struct nlmsghdr *)buf; |
71 | nlh->nlmsg_seq = seq++; |
72 | nlh->nlmsg_pid = getpid(); |
73 | nlh->nlmsg_type = NLMSG_DONE; |
74 | nlh->nlmsg_len = NLMSG_LENGTH(size - sizeof(*nlh)); |
75 | nlh->nlmsg_flags = 0; |
76 | |
77 | m = NLMSG_DATA(nlh); |
78 | #if 0 |
79 | ulog("%s: [%08x.%08x] len=%u, seq=%u, ack=%u.\n", |
80 | __func__, msg->id.idx, msg->id.val, msg->len, msg->seq, msg->ack); |
81 | #endif |
82 | memcpy(m, msg, sizeof(*m) + msg->len); |
83 | |
84 | err = send(s, nlh, size, 0); |
85 | if (err == -1) |
86 | ulog("Failed to send: %s [%d].\n", |
87 | strerror(errno), errno); |
88 | |
89 | return err; |
90 | } |
91 | |
92 | static void usage(void) |
93 | { |
94 | printf( |
95 | "Usage: ucon [options] [output file]\n" |
96 | "\n" |
97 | "\t-h\tthis help screen\n" |
98 | "\t-s\tsend buffers to the test module\n" |
99 | "\n" |
100 | "The default behavior of ucon is to subscribe to the test module\n" |
101 | "and wait for state messages. Any ones received are dumped to the\n" |
102 | "specified output file (or stdout). The test module is assumed to\n" |
103 | "have an id of {%u.%u}\n" |
104 | "\n" |
105 | "If you get no output, then verify the cn_test module id matches\n" |
106 | "the expected id above.\n" |
107 | , CN_TEST_IDX, CN_TEST_VAL |
108 | ); |
109 | } |
110 | |
111 | int main(int argc, char *argv[]) |
112 | { |
113 | int s; |
114 | char buf[1024]; |
115 | int len; |
116 | struct nlmsghdr *reply; |
117 | struct sockaddr_nl l_local; |
118 | struct cn_msg *data; |
119 | FILE *out; |
120 | time_t tm; |
121 | struct pollfd pfd; |
122 | bool send_msgs = false; |
123 | |
124 | while ((s = getopt(argc, argv, "hs")) != -1) { |
125 | switch (s) { |
126 | case 's': |
127 | send_msgs = true; |
128 | break; |
129 | |
130 | case 'h': |
131 | usage(); |
132 | return 0; |
133 | |
134 | default: |
135 | /* getopt() outputs an error for us */ |
136 | usage(); |
137 | return 1; |
138 | } |
139 | } |
140 | |
141 | if (argc != optind) { |
142 | out = fopen(argv[optind], "a+"); |
143 | if (!out) { |
144 | ulog("Unable to open %s for writing: %s\n", |
145 | argv[1], strerror(errno)); |
146 | out = stdout; |
147 | } |
148 | } else |
149 | out = stdout; |
150 | |
151 | memset(buf, 0, sizeof(buf)); |
152 | |
153 | s = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR); |
154 | if (s == -1) { |
155 | perror("socket"); |
156 | return -1; |
157 | } |
158 | |
159 | l_local.nl_family = AF_NETLINK; |
160 | l_local.nl_groups = -1; /* bitmask of requested groups */ |
161 | l_local.nl_pid = 0; |
162 | |
163 | ulog("subscribing to %u.%u\n", CN_TEST_IDX, CN_TEST_VAL); |
164 | |
165 | if (bind(s, (struct sockaddr *)&l_local, sizeof(struct sockaddr_nl)) == -1) { |
166 | perror("bind"); |
167 | close(s); |
168 | return -1; |
169 | } |
170 | |
171 | #if 0 |
172 | { |
173 | int on = 0x57; /* Additional group number */ |
174 | setsockopt(s, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP, &on, sizeof(on)); |
175 | } |
176 | #endif |
177 | if (send_msgs) { |
178 | int i, j; |
179 | |
180 | memset(buf, 0, sizeof(buf)); |
181 | |
182 | data = (struct cn_msg *)buf; |
183 | |
184 | data->id.idx = CN_TEST_IDX; |
185 | data->id.val = CN_TEST_VAL; |
186 | data->seq = seq++; |
187 | data->ack = 0; |
188 | data->len = 0; |
189 | |
190 | for (j=0; j<10; ++j) { |
191 | for (i=0; i<1000; ++i) { |
192 | len = netlink_send(s, data); |
193 | } |
194 | |
195 | ulog("%d messages have been sent to %08x.%08x.\n", i, data->id.idx, data->id.val); |
196 | } |
197 | |
198 | return 0; |
199 | } |
200 | |
201 | |
202 | pfd.fd = s; |
203 | |
204 | while (!need_exit) { |
205 | pfd.events = POLLIN; |
206 | pfd.revents = 0; |
207 | switch (poll(&pfd, 1, -1)) { |
208 | case 0: |
209 | need_exit = 1; |
210 | break; |
211 | case -1: |
212 | if (errno != EINTR) { |
213 | need_exit = 1; |
214 | break; |
215 | } |
216 | continue; |
217 | } |
218 | if (need_exit) |
219 | break; |
220 | |
221 | memset(buf, 0, sizeof(buf)); |
222 | len = recv(s, buf, sizeof(buf), 0); |
223 | if (len == -1) { |
224 | perror("recv buf"); |
225 | close(s); |
226 | return -1; |
227 | } |
228 | reply = (struct nlmsghdr *)buf; |
229 | |
230 | switch (reply->nlmsg_type) { |
231 | case NLMSG_ERROR: |
232 | fprintf(out, "Error message received.\n"); |
233 | fflush(out); |
234 | break; |
235 | case NLMSG_DONE: |
236 | data = (struct cn_msg *)NLMSG_DATA(reply); |
237 | |
238 | time(&tm); |
239 | fprintf(out, "%.24s : [%x.%x] [%08u.%08u].\n", |
240 | ctime(&tm), data->id.idx, data->id.val, data->seq, data->ack); |
241 | fflush(out); |
242 | break; |
243 | default: |
244 | break; |
245 | } |
246 | } |
247 | |
248 | close(s); |
249 | return 0; |
250 | } |
251 |
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