library.c revision 0b55b5852b9fe2ed6cceada004db303fe6efe6ce
1/* 2 * This file is part of ltrace. 3 * Copyright (C) 2011,2012 Petr Machata, Red Hat Inc. 4 * Copyright (C) 2001,2009 Juan Cespedes 5 * Copyright (C) 2006 Ian Wienand 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License as 9 * published by the Free Software Foundation; either version 2 of the 10 * License, or (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, but 13 * WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * 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., 51 Franklin St, Fifth Floor, Boston, MA 20 * 02110-1301 USA 21 */ 22 23#include <stdlib.h> 24#include <string.h> 25#include <assert.h> 26 27#include "library.h" 28#include "proc.h" // for enum callback_status 29#include "debug.h" 30 31/* If the other symbol owns the name, we need to make the copy, so 32 * that the life-times of the two symbols are not dependent on each 33 * other. */ 34static int 35strdup_if_owned(const char **retp, const char *str, int owned) 36{ 37 if (!owned || str == NULL) { 38 *retp = str; 39 return 0; 40 } else { 41 *retp = strdup(str); 42 return *retp != NULL ? 0 : -1; 43 } 44} 45 46void 47library_symbol_init(struct library_symbol *libsym, 48 target_address_t addr, const char *name, int own_name, 49 enum toplt type_of_plt) 50{ 51 libsym->next = NULL; 52 libsym->lib = NULL; 53 libsym->plt_type = type_of_plt; 54 libsym->name = name; 55 libsym->own_name = own_name; 56 libsym->enter_addr = (void *)(uintptr_t)addr; 57} 58 59void 60library_symbol_destroy(struct library_symbol *libsym) 61{ 62 if (libsym != NULL && libsym->own_name) 63 free((char *)libsym->name); 64} 65 66int 67library_symbol_clone(struct library_symbol *retp, struct library_symbol *libsym) 68{ 69 const char *name; 70 if (strdup_if_owned(&name, libsym->name, libsym->own_name) < 0) 71 return -1; 72 73 library_symbol_init(retp, libsym->enter_addr, 74 name, libsym->own_name, libsym->plt_type); 75 return 0; 76} 77 78int 79library_symbol_cmp(struct library_symbol *a, struct library_symbol *b) 80{ 81 if (a->enter_addr < b->enter_addr) 82 return -1; 83 if (a->enter_addr > b->enter_addr) 84 return 1; 85 if (a->name != NULL && b->name != NULL) 86 return strcmp(a->name, b->name); 87 if (a->name == NULL) { 88 if (b->name == NULL) 89 return 0; 90 return -1; 91 } 92 return 1; 93} 94 95enum callback_status 96library_symbol_equal_cb(struct library_symbol *libsym, void *u) 97{ 98 struct library_symbol *standard = u; 99 return library_symbol_cmp(libsym, standard) == 0 ? CBS_STOP : CBS_CONT; 100} 101 102void 103library_init(struct library *lib) 104{ 105 lib->next = NULL; 106 lib->soname = NULL; 107 lib->own_soname = 0; 108 lib->pathname = NULL; 109 lib->own_pathname = 0; 110 lib->symbols = NULL; 111} 112 113int 114library_clone(struct library *retp, struct library *lib) 115{ 116 const char *soname = NULL; 117 const char *pathname; 118 if (strdup_if_owned(&soname, lib->soname, lib->own_soname) < 0 119 || strdup_if_owned(&pathname, 120 lib->pathname, lib->own_pathname) < 0) { 121 if (lib->own_soname) 122 free((char *)soname); 123 return -1; 124 } 125 126 library_init(retp); 127 library_set_soname(lib, soname, lib->own_soname); 128 library_set_soname(lib, pathname, lib->own_pathname); 129 130 struct library_symbol *it; 131 struct library_symbol **nsymp = &retp->symbols; 132 for (it = lib->symbols; it != NULL; it = it->next) { 133 *nsymp = malloc(sizeof(**nsymp)); 134 if (*nsymp == NULL 135 || library_symbol_clone(*nsymp, it) < 0) { 136 /* Release what we managed to allocate. */ 137 library_destroy(retp); 138 return -1; 139 } 140 141 (*nsymp)->lib = retp; 142 nsymp = &(*nsymp)->next; 143 } 144 return 0; 145} 146 147void 148library_destroy(struct library *lib) 149{ 150 if (lib == NULL) 151 return; 152 library_set_soname(lib, NULL, 0); 153 library_set_pathname(lib, NULL, 0); 154 155 struct library_symbol *sym; 156 for (sym = lib->symbols; sym != NULL; ) { 157 struct library_symbol *next = sym->next; 158 library_symbol_destroy(sym); 159 free(sym); 160 sym = next; 161 } 162} 163 164void 165library_set_soname(struct library *lib, const char *new_name, int own_name) 166{ 167 if (lib->own_soname) 168 free((char *)lib->soname); 169 lib->soname = new_name; 170 lib->own_soname = own_name; 171} 172 173void 174library_set_pathname(struct library *lib, const char *new_name, int own_name) 175{ 176 if (lib->own_pathname) 177 free((char *)lib->pathname); 178 lib->pathname = new_name; 179 lib->own_pathname = own_name; 180} 181 182struct library_symbol * 183library_each_symbol(struct library *lib, struct library_symbol *start_after, 184 enum callback_status (*cb)(struct library_symbol *, void *), 185 void *data) 186{ 187 struct library_symbol *it = start_after == NULL ? lib->symbols 188 : start_after->next; 189 190 while (it != NULL) { 191 struct library_symbol *next = it->next; 192 193 switch ((*cb)(it, data)) { 194 case CBS_FAIL: 195 /* XXX handle me */ 196 case CBS_STOP: 197 return it; 198 case CBS_CONT: 199 break; 200 } 201 202 it = next; 203 } 204 205 return NULL; 206} 207 208void 209library_add_symbol(struct library *lib, struct library_symbol *first) 210{ 211 struct library_symbol *last; 212 for (last = first; last != NULL; ) { 213 last->lib = lib; 214 if (last->next != NULL) 215 last = last->next; 216 else 217 break; 218 } 219 220 assert(last->next == NULL); 221 last->next = lib->symbols; 222 lib->symbols = first; 223} 224 225enum callback_status 226library_named_cb(struct Process *proc, struct library *lib, void *name) 227{ 228 if (name == lib->soname 229 || strcmp(lib->soname, (char *)name) == 0) 230 return CBS_STOP; 231 else 232 return CBS_CONT; 233} 234 235enum callback_status 236library_with_base_cb(struct Process *proc, struct library *lib, void *basep) 237{ 238 return lib->base == *(target_address_t *)basep ? CBS_STOP : CBS_CONT; 239} 240