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897522ea EP |
1 | /* |
2 | * ucon.c | |
3 | * | |
acb9c1b2 | 4 | * Copyright (c) 2004+ Evgeniy Polyakov <zbr@ioremap.net> |
897522ea EP |
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 | ||
37cf2b8d | 33 | #include <stdbool.h> |
897522ea EP |
34 | #include <stdio.h> |
35 | #include <stdlib.h> | |
36 | #include <unistd.h> | |
37 | #include <string.h> | |
38 | #include <errno.h> | |
39 | #include <time.h> | |
37cf2b8d | 40 | #include <getopt.h> |
897522ea EP |
41 | |
42 | #include <linux/connector.h> | |
43 | ||
44 | #define DEBUG | |
45 | #define NETLINK_CONNECTOR 11 | |
46 | ||
37cf2b8d MF |
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 | ||
897522ea EP |
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; | |
05742faf | 74 | nlh->nlmsg_len = size; |
897522ea EP |
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 | ||
37cf2b8d MF |
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 | ||
897522ea EP |
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; | |
37cf2b8d MF |
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 | } | |
897522ea | 140 | |
37cf2b8d MF |
141 | if (argc != optind) { |
142 | out = fopen(argv[optind], "a+"); | |
897522ea EP |
143 | if (!out) { |
144 | ulog("Unable to open %s for writing: %s\n", | |
145 | argv[1], strerror(errno)); | |
146 | out = stdout; | |
147 | } | |
37cf2b8d MF |
148 | } else |
149 | out = stdout; | |
897522ea EP |
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; | |
37cf2b8d | 160 | l_local.nl_groups = -1; /* bitmask of requested groups */ |
897522ea EP |
161 | l_local.nl_pid = 0; |
162 | ||
37cf2b8d MF |
163 | ulog("subscribing to %u.%u\n", CN_TEST_IDX, CN_TEST_VAL); |
164 | ||
897522ea EP |
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 | |
37cf2b8d | 177 | if (send_msgs) { |
897522ea EP |
178 | int i, j; |
179 | ||
180 | memset(buf, 0, sizeof(buf)); | |
181 | ||
182 | data = (struct cn_msg *)buf; | |
183 | ||
37cf2b8d MF |
184 | data->id.idx = CN_TEST_IDX; |
185 | data->id.val = CN_TEST_VAL; | |
897522ea EP |
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 | } |