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3a5713da DG |
1 | /* |
2 | * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License, version 2 only, as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
18 | #define _GNU_SOURCE | |
19 | #include <arpa/inet.h> | |
20 | #include <netdb.h> | |
21 | #include <stdlib.h> | |
22 | #include <string.h> | |
23 | #include <sys/socket.h> | |
24 | ||
25 | #include <common/common.h> | |
26 | #include <common/defaults.h> | |
27 | ||
28 | #include "uri.h" | |
29 | ||
30 | enum uri_proto_code { | |
31 | P_NET, P_NET6, P_FILE, P_TCP, P_TCP6, | |
32 | }; | |
33 | ||
34 | struct uri_proto { | |
35 | char *name; | |
36 | enum uri_proto_code code; | |
37 | enum lttng_proto_type type; | |
38 | enum lttng_dst_type dtype; | |
39 | }; | |
40 | ||
41 | /* Supported protocols */ | |
42 | static const struct uri_proto proto_uri[] = { | |
43 | { .name = "file", .code = P_FILE, .type = 0, .dtype = LTTNG_DST_PATH}, | |
44 | { .name = "net", .code = P_NET, .type = LTTNG_TCP, .dtype = LTTNG_DST_IPV4 }, | |
45 | { .name = "net6", .code = P_NET6, .type = LTTNG_TCP, .dtype = LTTNG_DST_IPV6 }, | |
46 | { .name = "tcp", .code = P_TCP, .type = LTTNG_TCP, .dtype = LTTNG_DST_IPV4 }, | |
47 | { .name = "tcp6", .code = P_TCP6, .type = LTTNG_TCP, .dtype = LTTNG_DST_IPV6 }, | |
48 | { .name = NULL } | |
49 | }; | |
50 | ||
51 | /* | |
52 | * Validate if proto is a supported protocol from proto_uri array. | |
53 | */ | |
54 | static const struct uri_proto *validate_protocol(char *proto) | |
55 | { | |
56 | const struct uri_proto *supported; | |
57 | ||
58 | /* Safety net */ | |
59 | if (proto == NULL) { | |
60 | goto end; | |
61 | } | |
62 | ||
63 | for (supported = &proto_uri[0]; | |
64 | supported->name != NULL; ++supported) { | |
65 | if (strncmp(proto, supported->name, strlen(proto)) == 0) { | |
66 | goto end; | |
67 | } | |
68 | } | |
69 | ||
70 | /* Proto not found */ | |
71 | return NULL; | |
72 | ||
73 | end: | |
74 | return supported; | |
75 | } | |
76 | ||
00e2e675 DG |
77 | /* |
78 | * Set network address from string into dst. Supports both IP string and | |
79 | * hostname. | |
80 | */ | |
81 | static int set_ip_address(const char *addr, int af, char *dst, size_t size) | |
82 | { | |
83 | int ret; | |
84 | unsigned char buf[sizeof(struct in6_addr)]; | |
85 | struct hostent *record; | |
86 | ||
87 | /* Network protocol */ | |
88 | ret = inet_pton(af, addr, buf); | |
89 | if (ret < 1) { | |
90 | /* We consider the dst to be an hostname or an invalid IP char */ | |
91 | record = gethostbyname2(addr, af); | |
92 | if (record == NULL) { | |
93 | /* At this point, the IP or the hostname is bad */ | |
b3e12287 | 94 | ERR("URI parse bad hostname %s for af %d", addr, af); |
00e2e675 DG |
95 | goto error; |
96 | } | |
97 | ||
98 | /* Translate IP to string */ | |
99 | (void) inet_ntop(af, record->h_addr_list[0], dst, size); | |
100 | } else { | |
101 | memcpy(dst, addr, size); | |
102 | } | |
103 | ||
104 | return 0; | |
105 | ||
106 | error: | |
107 | return -1; | |
108 | } | |
109 | ||
3a5713da DG |
110 | /* |
111 | * Compare two URIs. | |
112 | * | |
113 | * Return 0 if equal else 1. | |
114 | */ | |
115 | int uri_compare(struct lttng_uri *uri1, struct lttng_uri *uri2) | |
116 | { | |
117 | return memcmp(uri1, uri2, sizeof(struct lttng_uri)); | |
118 | } | |
119 | ||
120 | /* | |
121 | * Free URI memory. | |
122 | */ | |
123 | void uri_free(struct lttng_uri *uri) | |
124 | { | |
125 | /* Safety check */ | |
126 | if (uri != NULL) { | |
127 | free(uri); | |
128 | } | |
129 | } | |
130 | ||
131 | /* | |
132 | * Return an allocated URI. | |
133 | */ | |
134 | struct lttng_uri *uri_create(void) | |
135 | { | |
136 | struct lttng_uri *uri; | |
137 | ||
138 | uri = zmalloc(sizeof(struct lttng_uri)); | |
139 | if (uri == NULL) { | |
140 | PERROR("zmalloc uri"); | |
141 | } | |
142 | ||
143 | return uri; | |
144 | } | |
145 | ||
00e2e675 DG |
146 | /* |
147 | * Parses a string URI to a lttng_uri. This function can potentially return | |
148 | * more than one URI in uris so the size of the array is returned and uris is | |
149 | * allocated and populated. Caller must free(3) the array. | |
150 | * | |
151 | * This function can not detect the stream type of the URI so the caller has to | |
152 | * make sure the correct type (stype) is set on the return URI(s). The default | |
153 | * port must also be set by the caller if the returned URI has its port set to | |
154 | * zero. | |
155 | */ | |
3a5713da DG |
156 | ssize_t uri_parse(const char *str_uri, struct lttng_uri **uris) |
157 | { | |
158 | int ret; | |
00e2e675 | 159 | size_t str_offset = 0; |
3a5713da DG |
160 | /* Size of the uris array. Default is 1 */ |
161 | ssize_t size = 1; | |
00e2e675 | 162 | char net[6], dst[LTTNG_MAX_DNNAME + 1], subdir[PATH_MAX]; |
b35d8a57 DG |
163 | unsigned int ctrl_port = 0; |
164 | unsigned int data_port = 0; | |
3a5713da DG |
165 | struct lttng_uri *uri; |
166 | const struct uri_proto *proto; | |
167 | ||
168 | /* | |
169 | * The first part is the protocol portion of a maximum of 5 bytes for now. | |
b35d8a57 DG |
170 | * The second part is the hostname or IP address. The 255 bytes size is the |
171 | * limit found in the RFC 1035 for the total length of a domain name | |
172 | * (https://www.ietf.org/rfc/rfc1035.txt). Finally, for the net:// | |
173 | * protocol, two ports CAN be specified. | |
3a5713da DG |
174 | */ |
175 | ||
176 | ret = sscanf(str_uri, "%5[^:]://", net); | |
177 | if (ret < 1) { | |
b3e12287 | 178 | ERR("URI parse bad protocol %s", str_uri); |
3a5713da DG |
179 | goto error; |
180 | } | |
181 | ||
00e2e675 | 182 | DBG3("URI string: %s", str_uri); |
3a5713da DG |
183 | |
184 | proto = validate_protocol(net); | |
185 | if (proto == NULL) { | |
b3e12287 | 186 | ERR("URI parse unknown protocol %s", net); |
3a5713da DG |
187 | ret = -1; |
188 | goto error; | |
189 | } | |
190 | ||
191 | if (proto->code == P_NET || proto->code == P_NET6) { | |
192 | /* Special case for net:// which requires two URI object */ | |
193 | size = 2; | |
194 | } | |
195 | ||
00e2e675 DG |
196 | memset(subdir, 0, sizeof(subdir)); |
197 | str_offset += strlen(net); | |
198 | ||
3a5713da | 199 | /* Parse the rest of the URI */ |
00e2e675 DG |
200 | if (sscanf(str_uri + str_offset, "://%255[^:]:%u:%u/%s", dst, &ctrl_port, |
201 | &data_port, subdir) == 4) { | |
202 | /* All set */ | |
203 | } else if (sscanf(str_uri + str_offset, "://%255[^:]:%u:%u", dst, | |
204 | &ctrl_port, &data_port) == 3) { | |
205 | } else if (sscanf(str_uri + str_offset, "://%255[^:]:%u/%s", dst, | |
206 | &ctrl_port, subdir) == 3) { | |
207 | } else if (sscanf(str_uri + str_offset, "://%255[^:]:%u", dst, | |
208 | &ctrl_port) == 2) { | |
209 | } else if (sscanf(str_uri + str_offset, "://%255[^/]/%s", dst, | |
210 | subdir) == 2) { | |
211 | } else { | |
212 | ret = sscanf(str_uri + str_offset, "://%255[^:]", dst); | |
213 | if (ret < 0) { | |
214 | ERR("Bad URI"); | |
215 | goto error; | |
216 | } | |
3a5713da DG |
217 | } |
218 | ||
219 | /* We have enough valid information to create URI(s) object */ | |
220 | ||
221 | /* Allocate URI array */ | |
222 | uri = zmalloc(sizeof(struct lttng_uri) * size); | |
223 | if (uri == NULL) { | |
224 | PERROR("zmalloc uri"); | |
225 | goto error; | |
226 | } | |
227 | ||
228 | /* Copy generic information */ | |
229 | uri[0].dtype = proto->dtype; | |
230 | uri[0].proto = proto->type; | |
231 | uri[0].port = ctrl_port; | |
00e2e675 | 232 | strncpy(uri[0].subdir, subdir, sizeof(uri[0].subdir)); |
3a5713da | 233 | |
00e2e675 DG |
234 | DBG3("URI dtype: %d, proto: %d, host: %s, subdir: %s, ctrl: %d, data: %d", |
235 | proto->dtype, proto->type, dst, subdir, ctrl_port, data_port); | |
3a5713da DG |
236 | |
237 | switch (proto->code) { | |
238 | case P_FILE: | |
239 | memcpy(uri[0].dst.path, dst, sizeof(uri[0].dst.path)); | |
240 | /* Reset port for the file:// URI */ | |
241 | uri[0].port = 0; | |
242 | DBG3("URI file destination: %s", dst); | |
243 | break; | |
244 | case P_NET: | |
245 | ret = set_ip_address(dst, AF_INET, uri[0].dst.ipv4, | |
246 | sizeof(uri[0].dst.ipv4)); | |
247 | if (ret < 0) { | |
248 | goto free_error; | |
249 | } | |
250 | ||
251 | memcpy(uri[1].dst.ipv4, uri[0].dst.ipv4, sizeof(uri[1].dst.ipv4)); | |
252 | ||
253 | uri[1].dtype = proto->dtype; | |
254 | uri[1].proto = proto->type; | |
255 | uri[1].port = data_port; | |
256 | break; | |
257 | case P_NET6: | |
258 | ret = set_ip_address(dst, AF_INET6, uri[0].dst.ipv6, | |
259 | sizeof(uri[0].dst.ipv6)); | |
260 | if (ret < 0) { | |
261 | goto free_error; | |
262 | } | |
263 | ||
264 | memcpy(uri[1].dst.ipv6, uri[0].dst.ipv6, sizeof(uri[1].dst.ipv6)); | |
265 | ||
266 | uri[1].dtype = proto->dtype; | |
267 | uri[1].proto = proto->type; | |
268 | uri[1].port = data_port; | |
269 | break; | |
270 | case P_TCP: | |
271 | ret = set_ip_address(dst, AF_INET, uri[0].dst.ipv4, | |
272 | sizeof(uri[0].dst.ipv4)); | |
273 | if (ret < 0) { | |
274 | goto free_error; | |
275 | } | |
276 | break; | |
277 | case P_TCP6: | |
278 | ret = set_ip_address(dst, AF_INET6, uri[0].dst.ipv6, | |
279 | sizeof(uri[0].dst.ipv6)); | |
280 | if (ret < 0) { | |
281 | goto free_error; | |
282 | } | |
283 | break; | |
284 | default: | |
285 | goto free_error; | |
286 | } | |
287 | ||
288 | *uris = uri; | |
289 | ||
290 | return size; | |
291 | ||
292 | free_error: | |
293 | free(uri); | |
294 | error: | |
295 | return -1; | |
296 | } |