Lucas De Marchi | e701e38 | 2012-01-26 17:01:41 -0200 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2012 ProFUSION embedded systems |
| 3 | * |
| 4 | * This program is free software: you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation, either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 16 | */ |
| 17 | |
Lucas De Marchi | 53646fc | 2012-01-26 02:09:28 -0200 | [diff] [blame] | 18 | #include <assert.h> |
| 19 | #include <errno.h> |
| 20 | #include <dirent.h> |
| 21 | #include <fcntl.h> |
| 22 | #include <dlfcn.h> |
| 23 | #include <limits.h> |
| 24 | #include <stdlib.h> |
| 25 | #include <stdarg.h> |
| 26 | #include <stddef.h> |
| 27 | #include <string.h> |
| 28 | #include <stdio.h> |
| 29 | #include <sys/types.h> |
| 30 | #include <sys/stat.h> |
| 31 | #include <unistd.h> |
| 32 | |
| 33 | /* kmod_elf_get_section() is not exported, we need the private header */ |
| 34 | #include <libkmod-private.h> |
| 35 | |
| 36 | /* FIXME: hack, change name so we don't clash */ |
| 37 | #undef ERR |
| 38 | #include "testsuite.h" |
| 39 | #include "stripped-module.h" |
| 40 | |
| 41 | struct mod { |
| 42 | struct mod *next; |
| 43 | int ret; |
| 44 | int errcode; |
| 45 | char name[]; |
| 46 | }; |
| 47 | |
| 48 | static struct mod *modules; |
| 49 | static bool need_init = true; |
| 50 | |
| 51 | static void parse_retcodes(struct mod *_modules, const char *s) |
| 52 | { |
| 53 | const char *p; |
| 54 | |
| 55 | if (s == NULL) |
| 56 | return; |
| 57 | |
| 58 | for (p = s;;) { |
| 59 | struct mod *mod; |
| 60 | const char *modname; |
| 61 | char *end; |
| 62 | size_t modnamelen; |
| 63 | int ret, errcode; |
| 64 | long l; |
| 65 | |
| 66 | modname = p; |
| 67 | if (modname == NULL || modname[0] == '\0') |
| 68 | break; |
| 69 | |
| 70 | modnamelen = strcspn(s, ":"); |
| 71 | if (modname[modnamelen] != ':') |
| 72 | break; |
| 73 | |
| 74 | p = modname + modnamelen + 1; |
| 75 | if (p == NULL) |
| 76 | break; |
| 77 | |
| 78 | l = strtol(p, &end, 0); |
| 79 | if (end == p || *end != ':') |
| 80 | break; |
| 81 | ret = (int) l; |
| 82 | p = end + 1; |
| 83 | |
| 84 | l = strtol(p, &end, 0); |
| 85 | if (*end == ':') |
| 86 | p = end + 1; |
| 87 | else if (*end != '\0') |
| 88 | break; |
| 89 | |
| 90 | errcode = (int) l; |
| 91 | |
| 92 | mod = malloc(sizeof(*mod) + modnamelen + 1); |
| 93 | if (mod == NULL) |
| 94 | break; |
| 95 | |
| 96 | memcpy(mod->name, modname, modnamelen); |
| 97 | mod->name[modnamelen] = '\0'; |
| 98 | mod->ret = ret; |
| 99 | mod->errcode = errcode; |
| 100 | mod->next = _modules; |
| 101 | _modules = mod; |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | static struct mod *find_module(struct mod *_modules, const char *modname) |
| 106 | { |
| 107 | struct mod *mod; |
| 108 | |
| 109 | for (mod = _modules; mod != NULL; mod = mod->next) { |
| 110 | if (strcmp(mod->name, modname)) |
| 111 | return mod; |
| 112 | } |
| 113 | |
| 114 | return NULL; |
| 115 | } |
| 116 | |
| 117 | static void init_retcodes(void) |
| 118 | { |
| 119 | const char *s; |
| 120 | |
| 121 | if (!need_init) |
| 122 | return; |
| 123 | |
| 124 | need_init = false; |
| 125 | s = getenv(S_TC_INIT_MODULE_RETCODES); |
| 126 | if (s == NULL) { |
| 127 | fprintf(stderr, "TRAP init_module(): missing export %s?\n", |
| 128 | S_TC_INIT_MODULE_RETCODES); |
| 129 | } |
| 130 | |
| 131 | parse_retcodes(modules, s); |
| 132 | } |
| 133 | |
| 134 | TS_EXPORT long init_module(void *mem, unsigned long len, const char *args); |
| 135 | |
| 136 | /* |
| 137 | * FIXME: change /sys/module/<modname> to fake-insert a module |
| 138 | * |
| 139 | * Default behavior is to exit successfully. If this is not the intended |
| 140 | * behavior, set TESTSUITE_INIT_MODULE_RETCODES env var. |
| 141 | */ |
| 142 | long init_module(void *mem, unsigned long len, const char *args) |
| 143 | { |
| 144 | const char *modname; |
| 145 | struct kmod_elf *elf; |
| 146 | struct mod *mod; |
| 147 | const void *buf; |
| 148 | uint64_t bufsize; |
| 149 | int err; |
| 150 | |
| 151 | init_retcodes(); |
| 152 | |
| 153 | elf = kmod_elf_new(mem, len); |
| 154 | if (elf == NULL) |
| 155 | return 0; |
| 156 | |
| 157 | err = kmod_elf_get_section(elf, ".gnu.linkonce.this_module", &buf, |
| 158 | &bufsize); |
| 159 | kmod_elf_unref(elf); |
| 160 | |
| 161 | /* |
| 162 | * We couldn't find the module's name inside the ELF file. Just exit |
| 163 | * as if it was successful |
| 164 | */ |
| 165 | if (err < 0) |
| 166 | return 0; |
| 167 | |
| 168 | modname = (char *)buf + offsetof(struct module, name); |
| 169 | mod = find_module(modules, modname); |
| 170 | if (mod == NULL) |
| 171 | return 0; |
| 172 | |
| 173 | errno = mod->errcode; |
| 174 | return mod->ret; |
| 175 | } |
| 176 | |
| 177 | /* the test is going away anyway, but lets keep valgrind happy */ |
| 178 | void free_resources(void) __attribute__((destructor)); |
| 179 | void free_resources(void) |
| 180 | { |
| 181 | while (modules) { |
| 182 | struct mod *mod = modules->next; |
| 183 | free(modules); |
| 184 | modules = mod; |
| 185 | } |
| 186 | } |