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30771d65 DL |
1 | /* |
2 | * Copyright (c) 2015-16 David Lamparter, for NetDEF, Inc. | |
3 | * | |
4 | * Permission is hereby granted, free of charge, to any person obtaining a | |
5 | * copy of this software and associated documentation files (the "Software"), | |
6 | * to deal in the Software without restriction, including without limitation | |
7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
8 | * and/or sell copies of the Software, and to permit persons to whom the | |
9 | * Software is furnished to do so, subject to the following conditions: | |
10 | * | |
11 | * The above copyright notice and this permission notice shall be included in | |
12 | * all copies or substantial portions of the Software. | |
13 | * | |
14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
17 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
18 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
19 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | |
20 | * DEALINGS IN THE SOFTWARE. | |
21 | */ | |
22 | ||
23 | #include "config.h" | |
24 | ||
25 | #include <stdlib.h> | |
26 | #include <stdio.h> | |
27 | #include <string.h> | |
28 | #include <unistd.h> | |
29 | #include <limits.h> | |
30 | #include <dlfcn.h> | |
31 | ||
32 | #include "module.h" | |
33 | #include "memory.h" | |
34 | #include "version.h" | |
35 | ||
36 | DEFINE_MTYPE_STATIC(LIB, MODULE_LOADNAME, "Module loading name") | |
37 | DEFINE_MTYPE_STATIC(LIB, MODULE_LOADARGS, "Module loading arguments") | |
38 | ||
39 | static struct frrmod_info frrmod_default_info = { | |
40 | .name = "libfrr", | |
41 | .version = FRR_VERSION, | |
42 | .description = "libfrr core module", | |
43 | }; | |
44 | union _frrmod_runtime_u frrmod_default = { | |
a97986ff DL |
45 | .r = { |
46 | .info = &frrmod_default_info, | |
47 | .finished_loading = 1, | |
48 | }, | |
30771d65 DL |
49 | }; |
50 | ||
51 | // if defined(HAVE_SYS_WEAK_ALIAS_ATTRIBUTE) | |
52 | // union _frrmod_runtime_u _frrmod_this_module | |
53 | // __attribute__((weak, alias("frrmod_default"))); | |
54 | // elif defined(HAVE_SYS_WEAK_ALIAS_PRAGMA) | |
55 | #pragma weak _frrmod_this_module = frrmod_default | |
56 | // else | |
57 | // error need weak symbol support | |
58 | // endif | |
59 | ||
60 | struct frrmod_runtime *frrmod_list = &frrmod_default.r; | |
61 | static struct frrmod_runtime **frrmod_last = &frrmod_default.r.next; | |
62 | static const char *execname = NULL; | |
63 | ||
64 | void frrmod_init(struct frrmod_runtime *modinfo) | |
65 | { | |
66 | modinfo->finished_loading = 1; | |
67 | *frrmod_last = modinfo; | |
68 | frrmod_last = &modinfo->next; | |
69 | ||
70 | execname = modinfo->info->name; | |
71 | } | |
72 | ||
d62a17ae | 73 | struct frrmod_runtime *frrmod_load(const char *spec, const char *dir, char *err, |
74 | size_t err_len) | |
30771d65 DL |
75 | { |
76 | void *handle = NULL; | |
77 | char name[PATH_MAX], fullpath[PATH_MAX], *args; | |
78 | struct frrmod_runtime *rtinfo, **rtinfop; | |
79 | const struct frrmod_info *info; | |
80 | ||
81 | snprintf(name, sizeof(name), "%s", spec); | |
82 | args = strchr(name, ':'); | |
83 | if (args) | |
84 | *args++ = '\0'; | |
85 | ||
86 | if (!strchr(name, '/')) { | |
87 | if (!handle && execname) { | |
d62a17ae | 88 | snprintf(fullpath, sizeof(fullpath), "%s/%s_%s.so", dir, |
89 | execname, name); | |
30771d65 DL |
90 | handle = dlopen(fullpath, RTLD_NOW | RTLD_GLOBAL); |
91 | } | |
92 | if (!handle) { | |
d62a17ae | 93 | snprintf(fullpath, sizeof(fullpath), "%s/%s.so", dir, |
94 | name); | |
30771d65 DL |
95 | handle = dlopen(fullpath, RTLD_NOW | RTLD_GLOBAL); |
96 | } | |
97 | } | |
98 | if (!handle) { | |
99 | snprintf(fullpath, sizeof(fullpath), "%s", name); | |
100 | handle = dlopen(fullpath, RTLD_NOW | RTLD_GLOBAL); | |
101 | } | |
102 | if (!handle) { | |
103 | if (err) | |
104 | snprintf(err, err_len, | |
d62a17ae | 105 | "loading module \"%s\" failed: %s", name, |
106 | dlerror()); | |
30771d65 DL |
107 | return NULL; |
108 | } | |
109 | ||
110 | rtinfop = dlsym(handle, "frr_module"); | |
111 | if (!rtinfop) { | |
112 | dlclose(handle); | |
113 | if (err) | |
114 | snprintf(err, err_len, | |
d62a17ae | 115 | "\"%s\" is not an FRR module: %s", name, |
116 | dlerror()); | |
30771d65 DL |
117 | return NULL; |
118 | } | |
119 | rtinfo = *rtinfop; | |
120 | rtinfo->load_name = XSTRDUP(MTYPE_MODULE_LOADNAME, name); | |
121 | rtinfo->dl_handle = handle; | |
122 | if (args) | |
123 | rtinfo->load_args = XSTRDUP(MTYPE_MODULE_LOADARGS, args); | |
124 | info = rtinfo->info; | |
125 | ||
126 | if (rtinfo->finished_loading) { | |
127 | dlclose(handle); | |
128 | if (err) | |
d62a17ae | 129 | snprintf(err, err_len, "module \"%s\" already loaded", |
130 | name); | |
30771d65 DL |
131 | goto out_fail; |
132 | } | |
133 | ||
134 | if (info->init && info->init()) { | |
135 | dlclose(handle); | |
136 | if (err) | |
137 | snprintf(err, err_len, | |
d62a17ae | 138 | "module \"%s\" initialisation failed", name); |
30771d65 DL |
139 | goto out_fail; |
140 | } | |
141 | ||
142 | rtinfo->finished_loading = 1; | |
143 | ||
144 | *frrmod_last = rtinfo; | |
145 | frrmod_last = &rtinfo->next; | |
146 | return rtinfo; | |
147 | ||
148 | out_fail: | |
149 | if (rtinfo->load_args) | |
150 | XFREE(MTYPE_MODULE_LOADARGS, rtinfo->load_args); | |
151 | XFREE(MTYPE_MODULE_LOADNAME, rtinfo->load_name); | |
152 | return NULL; | |
153 | } | |
154 | ||
155 | #if 0 | |
156 | void frrmod_unload(struct frrmod_runtime *module) | |
157 | { | |
158 | } | |
159 | #endif |