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4b292b55 VB |
1 | /* -*- mode: c; c-file-style: "openbsd" -*- */ |
2 | /* | |
3 | * Copyright (c) 2012 Vincent Bernat <bernat@luffy.cx> | |
4 | * | |
5 | * Permission to use, copy, modify, and/or distribute this software for any | |
6 | * purpose with or without fee is hereby granted, provided that the above | |
7 | * copyright notice and this permission notice appear in all copies. | |
8 | * | |
9 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
10 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
11 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
12 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
13 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
14 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
15 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
16 | */ | |
17 | ||
18 | #include <unistd.h> | |
19 | #include <errno.h> | |
4e5f34c5 | 20 | #include <string.h> |
4b292b55 VB |
21 | #include <sys/socket.h> |
22 | #include <sys/un.h> | |
23 | ||
24 | #include "lldpctl.h" | |
25 | #include "private.h" | |
26 | #include "../compat/compat.h" | |
27 | #include "../ctl.h" | |
4e90a9e0 VB |
28 | #include "../log.h" |
29 | #include "../lldpd-structs.h" | |
4b292b55 VB |
30 | |
31 | const char* | |
32 | lldpctl_get_default_transport(void) | |
33 | { | |
34 | return LLDPD_CTL_SOCKET; | |
35 | } | |
36 | ||
37 | /* Connect to the remote end */ | |
38 | static int | |
0262adbb | 39 | sync_connect(lldpctl_conn_t *lldpctl) |
4b292b55 | 40 | { |
0262adbb | 41 | return ctl_connect(lldpctl->ctlname); |
4b292b55 VB |
42 | } |
43 | ||
44 | /* Synchronously send data to remote end. */ | |
45 | static ssize_t | |
46 | sync_send(lldpctl_conn_t *lldpctl, | |
47 | const uint8_t *data, size_t length, void *user_data) | |
48 | { | |
49 | struct lldpctl_conn_sync_t *conn = user_data; | |
50 | size_t nb; | |
51 | ||
52 | if (conn->fd == -1 && | |
0262adbb | 53 | ((conn->fd = sync_connect(lldpctl)) == -1)) { |
4b292b55 VB |
54 | return LLDPCTL_ERR_CANNOT_CONNECT; |
55 | } | |
56 | ||
57 | while ((nb = write(conn->fd, data, length)) == -1) { | |
58 | if (errno == EAGAIN || errno == EINTR) continue; | |
59 | return LLDPCTL_ERR_CALLBACK_FAILURE; | |
60 | } | |
61 | return nb; | |
62 | } | |
63 | ||
64 | /* Statiscally receive data from remote end. */ | |
65 | static ssize_t | |
66 | sync_recv(lldpctl_conn_t *lldpctl, | |
67 | const uint8_t *data, size_t length, void *user_data) | |
68 | { | |
69 | struct lldpctl_conn_sync_t *conn = user_data; | |
70 | size_t nb; | |
e581ec30 | 71 | size_t remain, offset = 0; |
4b292b55 VB |
72 | |
73 | if (conn->fd == -1 && | |
0262adbb | 74 | ((conn->fd = sync_connect(lldpctl)) == -1)) { |
4b292b55 VB |
75 | lldpctl->error = LLDPCTL_ERR_CANNOT_CONNECT; |
76 | return LLDPCTL_ERR_CANNOT_CONNECT; | |
77 | } | |
78 | ||
e581ec30 VB |
79 | remain = length; |
80 | do { | |
81 | if ((nb = read(conn->fd, (void*)data + offset, remain)) == -1 && | |
82 | (errno == EAGAIN || errno == EINTR)) | |
83 | continue; | |
84 | remain -= nb; | |
85 | offset += nb; | |
86 | } while (remain > 0 && nb > 0); | |
87 | return offset; | |
4b292b55 VB |
88 | } |
89 | ||
4b292b55 VB |
90 | lldpctl_conn_t* |
91 | lldpctl_new(lldpctl_send_callback send, lldpctl_recv_callback recv, void *user_data) | |
0262adbb ZM |
92 | { |
93 | return lldpctl_new_name(lldpctl_get_default_transport(), send, recv, user_data); | |
94 | } | |
95 | ||
96 | lldpctl_conn_t* | |
97 | lldpctl_new_name(const char *ctlname, lldpctl_send_callback send, lldpctl_recv_callback recv, void *user_data) | |
4b292b55 VB |
98 | { |
99 | lldpctl_conn_t *conn = NULL; | |
100 | struct lldpctl_conn_sync_t *data = NULL; | |
101 | ||
102 | /* Both callbacks are mandatory or should be NULL. */ | |
103 | if (send && !recv) return NULL; | |
104 | if (recv && !send) return NULL; | |
105 | ||
106 | if ((conn = calloc(1, sizeof(lldpctl_conn_t))) == NULL) | |
107 | return NULL; | |
108 | ||
0262adbb ZM |
109 | conn->ctlname = strdup(ctlname); |
110 | if (conn->ctlname == NULL) { | |
111 | free(conn); | |
112 | return NULL; | |
113 | } | |
4b292b55 VB |
114 | if (!send && !recv) { |
115 | if ((data = malloc(sizeof(struct lldpctl_conn_sync_t))) == NULL) { | |
116 | free(conn); | |
117 | return NULL; | |
118 | } | |
119 | data->fd = -1; | |
120 | conn->send = sync_send; | |
121 | conn->recv = sync_recv; | |
122 | conn->user_data = data; | |
123 | } else { | |
124 | conn->send = send; | |
125 | conn->recv = recv; | |
126 | conn->user_data = user_data; | |
127 | } | |
128 | ||
129 | return conn; | |
130 | } | |
131 | ||
132 | int | |
133 | lldpctl_release(lldpctl_conn_t *conn) | |
134 | { | |
135 | if (conn == NULL) return 0; | |
0262adbb | 136 | free(conn->ctlname); |
4b292b55 VB |
137 | if (conn->send == sync_send) { |
138 | struct lldpctl_conn_sync_t *data = conn->user_data; | |
139 | if (data->fd != -1) close(data->fd); | |
140 | free(conn->user_data); | |
141 | } | |
142 | free(conn->input_buffer); | |
143 | free(conn->output_buffer); | |
144 | free(conn); | |
145 | return 0; | |
146 | } | |
147 | ||
148 | /** | |
149 | * Request some bytes if they are not already here. | |
150 | * | |
151 | * @param conn The connection to lldpd. | |
152 | * @param length The number of requested bytes. | |
153 | * @return A negative integer if we can't have the bytes or the number of bytes we got. | |
154 | */ | |
155 | ssize_t | |
156 | _lldpctl_needs(lldpctl_conn_t *conn, size_t length) | |
157 | { | |
158 | uint8_t *buffer = NULL; | |
159 | ssize_t rc; | |
160 | if (conn->input_buffer_len >= length) return 0; | |
161 | ||
162 | if ((buffer = malloc(length)) == NULL) | |
163 | return SET_ERROR(conn, LLDPCTL_ERR_NOMEM); | |
164 | rc = conn->recv(conn, buffer, length, conn->user_data); | |
165 | if (rc < 0) { | |
166 | free(buffer); | |
167 | return SET_ERROR(conn, rc); | |
168 | } | |
169 | if (rc == 0) { | |
170 | free(buffer); | |
171 | return SET_ERROR(conn, LLDPCTL_ERR_EOF); | |
172 | } | |
173 | rc = lldpctl_recv(conn, buffer, rc); | |
174 | free(buffer); | |
175 | if (rc < 0) | |
176 | return SET_ERROR(conn, rc); | |
177 | RESET_ERROR(conn); | |
178 | return rc; | |
179 | } | |
180 | ||
4e90a9e0 VB |
181 | static void |
182 | check_for_notification(lldpctl_conn_t *conn) | |
183 | { | |
184 | struct lldpd_neighbor_change *change; | |
0e940d8d | 185 | void *p; |
4e90a9e0 VB |
186 | int rc; |
187 | lldpctl_change_t type; | |
188 | lldpctl_atom_t *interface = NULL, *neighbor = NULL; | |
189 | rc = ctl_msg_recv_unserialized(&conn->input_buffer, | |
190 | &conn->input_buffer_len, | |
191 | NOTIFICATION, | |
0e940d8d | 192 | &p, |
4e90a9e0 VB |
193 | &MARSHAL_INFO(lldpd_neighbor_change)); |
194 | if (rc != 0) return; | |
0e940d8d | 195 | change = p; |
4e90a9e0 VB |
196 | |
197 | /* We have a notification, call the callback */ | |
198 | if (conn->watch_cb) { | |
199 | switch (change->state) { | |
200 | case NEIGHBOR_CHANGE_DELETED: type = lldpctl_c_deleted; break; | |
201 | case NEIGHBOR_CHANGE_ADDED: type = lldpctl_c_added; break; | |
202 | case NEIGHBOR_CHANGE_UPDATED: type = lldpctl_c_updated; break; | |
203 | default: | |
6f8925be | 204 | log_warnx("control", "unknown notification type (%d)", |
4e90a9e0 VB |
205 | change->state); |
206 | goto end; | |
207 | } | |
208 | interface = _lldpctl_new_atom(conn, atom_interface, | |
209 | change->ifname); | |
210 | if (interface == NULL) goto end; | |
211 | neighbor = _lldpctl_new_atom(conn, atom_port, | |
212 | NULL, change->neighbor, NULL); | |
213 | if (neighbor == NULL) goto end; | |
214 | conn->watch_cb(conn, type, interface, neighbor, conn->watch_data); | |
215 | conn->watch_triggered = 1; | |
216 | goto end; | |
217 | } | |
218 | ||
219 | end: | |
220 | if (interface) lldpctl_atom_dec_ref(interface); | |
221 | if (neighbor) lldpctl_atom_dec_ref(neighbor); | |
222 | else { | |
223 | lldpd_chassis_cleanup(change->neighbor->p_chassis, 1); | |
224 | lldpd_port_cleanup(change->neighbor, 1); | |
225 | free(change->neighbor); | |
226 | } | |
227 | free(change->ifname); | |
228 | free(change); | |
229 | } | |
230 | ||
4b292b55 VB |
231 | ssize_t |
232 | lldpctl_recv(lldpctl_conn_t *conn, const uint8_t *data, size_t length) | |
233 | { | |
234 | ||
235 | RESET_ERROR(conn); | |
236 | ||
237 | if (length == 0) return 0; | |
238 | ||
239 | /* Received data should be appended to the input buffer. */ | |
240 | if (conn->input_buffer == NULL) { | |
241 | conn->input_buffer_len = 0; | |
242 | if ((conn->input_buffer = malloc(length)) == NULL) | |
243 | return SET_ERROR(conn, LLDPCTL_ERR_NOMEM); | |
244 | } else { | |
245 | uint8_t *new = realloc(conn->input_buffer, conn->input_buffer_len + length); | |
246 | if (new == NULL) | |
247 | return SET_ERROR(conn, LLDPCTL_ERR_NOMEM); | |
248 | conn->input_buffer = new; | |
249 | } | |
250 | memcpy(conn->input_buffer + conn->input_buffer_len, data, length); | |
251 | conn->input_buffer_len += length; | |
4e90a9e0 VB |
252 | |
253 | /* Is it a notification? */ | |
254 | check_for_notification(conn); | |
255 | ||
4b292b55 | 256 | RESET_ERROR(conn); |
4e90a9e0 VB |
257 | |
258 | return conn->input_buffer_len; | |
4b292b55 VB |
259 | } |
260 | ||
261 | ssize_t | |
262 | lldpctl_send(lldpctl_conn_t *conn) | |
263 | { | |
264 | /* Send waiting data. */ | |
265 | ssize_t rc; | |
266 | ||
267 | RESET_ERROR(conn); | |
268 | ||
269 | if (!conn->output_buffer) return 0; | |
270 | rc = conn->send(conn, | |
271 | conn->output_buffer, conn->output_buffer_len, | |
272 | conn->user_data); | |
273 | if (rc < 0) return SET_ERROR(conn, rc); | |
274 | ||
275 | /* "Shrink" the output buffer. */ | |
276 | if (rc == conn->output_buffer_len) { | |
277 | free(conn->output_buffer); | |
278 | conn->output_buffer = NULL; | |
279 | conn->output_buffer_len = 0; | |
280 | RESET_ERROR(conn); | |
281 | return rc; | |
282 | } | |
283 | conn->output_buffer_len -= rc; | |
284 | memmove(conn->output_buffer, conn->output_buffer + rc, conn->output_buffer_len); | |
285 | /* We don't shrink the buffer. It will be either freed or shrinked later */ | |
286 | RESET_ERROR(conn); | |
287 | return rc; | |
288 | } |