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freebsd-dev/usr.bin/ar/write.c
Bryan Drewery bd9302d862 Check archive_entry_new() result. 
Coverity CID:	1331341
2015-10-29 19:28:21 +00:00

908 lines
24 KiB
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/*-
* Copyright (c) 2007 Kai Wang
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer
* in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/endian.h>
#include <sys/mman.h>
#include <sys/queue.h>
#include <sys/stat.h>
#include <archive.h>
#include <archive_entry.h>
#include <errno.h>
#include <fcntl.h>
#include <gelf.h>
#include <libgen.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
#include "ar.h"
#define _ARMAG_LEN 8 /* length of ar magic string */
#define _ARHDR_LEN 60 /* length of ar header */
#define _INIT_AS_CAP 128 /* initial archive string table size */
#define _INIT_SYMOFF_CAP (256*(sizeof(uint32_t))) /* initial so table size */
#define _INIT_SYMNAME_CAP 1024 /* initial sn table size */
#define _MAXNAMELEN_SVR4 15 /* max member name length in svr4 variant */
#define _TRUNCATE_LEN 15 /* number of bytes to keep for member name */
static void add_to_ar_str_table(struct bsdar *bsdar, const char *name);
static void add_to_ar_sym_table(struct bsdar *bsdar, const char *name);
static struct ar_obj *create_obj_from_file(struct bsdar *bsdar,
const char *name, time_t mtime);
static void create_symtab_entry(struct bsdar *bsdar, void *maddr,
size_t size);
static void free_obj(struct bsdar *bsdar, struct ar_obj *obj);
static void insert_obj(struct bsdar *bsdar, struct ar_obj *obj,
struct ar_obj *pos);
static void prefault_buffer(const char *buf, size_t s);
static void read_objs(struct bsdar *bsdar, const char *archive,
int checkargv);
static void write_archive(struct bsdar *bsdar, char mode);
static void write_cleanup(struct bsdar *bsdar);
static void write_data(struct bsdar *bsdar, struct archive *a,
const void *buf, size_t s);
static void write_objs(struct bsdar *bsdar);
void
ar_mode_d(struct bsdar *bsdar)
{
write_archive(bsdar, 'd');
}
void
ar_mode_m(struct bsdar *bsdar)
{
write_archive(bsdar, 'm');
}
void
ar_mode_q(struct bsdar *bsdar)
{
write_archive(bsdar, 'q');
}
void
ar_mode_r(struct bsdar *bsdar)
{
write_archive(bsdar, 'r');
}
void
ar_mode_s(struct bsdar *bsdar)
{
write_archive(bsdar, 's');
}
void
ar_mode_A(struct bsdar *bsdar)
{
write_archive(bsdar, 'A');
}
/*
* Create object from file, return created obj upon success, or NULL
* when an error occurs or the member is not newer than existing
* one while -u is specified.
*/
static struct ar_obj *
create_obj_from_file(struct bsdar *bsdar, const char *name, time_t mtime)
{
struct ar_obj *obj;
struct stat sb;
const char *bname;
if (name == NULL)
return (NULL);
obj = malloc(sizeof(struct ar_obj));
if (obj == NULL)
bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
if ((obj->fd = open(name, O_RDONLY, 0)) < 0) {
bsdar_warnc(bsdar, errno, "can't open file: %s", name);
free(obj);
return (NULL);
}
if ((bname = basename(name)) == NULL)
bsdar_errc(bsdar, EX_SOFTWARE, errno, "basename failed");
if (bsdar->options & AR_TR && strlen(bname) > _TRUNCATE_LEN) {
if ((obj->name = malloc(_TRUNCATE_LEN + 1)) == NULL)
bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
(void)strncpy(obj->name, bname, _TRUNCATE_LEN);
obj->name[_TRUNCATE_LEN] = '\0';
} else
if ((obj->name = strdup(bname)) == NULL)
bsdar_errc(bsdar, EX_SOFTWARE, errno, "strdup failed");
if (fstat(obj->fd, &sb) < 0) {
bsdar_warnc(bsdar, errno, "can't fstat file: %s", obj->name);
goto giveup;
}
if (!S_ISREG(sb.st_mode)) {
bsdar_warnc(bsdar, 0, "%s is not an ordinary file", obj->name);
goto giveup;
}
/*
* When option '-u' is specified and member is not newer than the
* existing one, the replace will not happen. While if mtime == 0,
* which indicates that this is to "replace a none exist member",
* the replace will proceed regardless of '-u'.
*/
if (mtime != 0 && bsdar->options & AR_U && sb.st_mtime <= mtime)
goto giveup;
/*
* When option '-D' is specified, mtime and UID / GID from the file
* will be replaced with 0, and file mode with 644. This ensures that
* checksums will match for two archives containing the exact same
* files.
*/
if (bsdar->options & AR_D) {
obj->uid = 0;
obj->gid = 0;
obj->mtime = 0;
obj->md = S_IFREG | 0644;
} else {
obj->uid = sb.st_uid;
obj->gid = sb.st_gid;
obj->mtime = sb.st_mtime;
obj->md = sb.st_mode;
}
obj->size = sb.st_size;
obj->dev = sb.st_dev;
obj->ino = sb.st_ino;
if (obj->size == 0) {
obj->maddr = NULL;
return (obj);
}
if ((obj->maddr = mmap(NULL, obj->size, PROT_READ,
MAP_PRIVATE, obj->fd, (off_t)0)) == MAP_FAILED) {
bsdar_warnc(bsdar, errno, "can't mmap file: %s", obj->name);
goto giveup;
}
if (close(obj->fd) < 0)
bsdar_errc(bsdar, EX_SOFTWARE, errno, "close failed: %s",
obj->name);
return (obj);
giveup:
if (close(obj->fd) < 0)
bsdar_errc(bsdar, EX_SOFTWARE, errno, "close failed: %s",
obj->name);
free(obj->name);
free(obj);
return (NULL);
}
/*
* Free object itself and its associated allocations.
*/
static void
free_obj(struct bsdar *bsdar, struct ar_obj *obj)
{
if (obj->fd == -1)
free(obj->maddr);
else
if (obj->maddr != NULL && munmap(obj->maddr, obj->size))
bsdar_warnc(bsdar, errno,
"can't munmap file: %s", obj->name);
free(obj->name);
free(obj);
}
/*
* Insert obj to the tail, or before/after the pos obj.
*/
static void
insert_obj(struct bsdar *bsdar, struct ar_obj *obj, struct ar_obj *pos)
{
if (obj == NULL)
bsdar_errc(bsdar, EX_SOFTWARE, 0, "try to insert a null obj");
if (pos == NULL || obj == pos)
/*
* If the object to move happens to be the position obj,
* or if there is not a pos obj, move it to tail.
*/
goto tail;
if (bsdar->options & AR_B) {
TAILQ_INSERT_BEFORE(pos, obj, objs);
return;
}
if (bsdar->options & AR_A) {
TAILQ_INSERT_AFTER(&bsdar->v_obj, pos, obj, objs);
return;
}
tail:
TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs);
}
/*
* Read objects from archive into v_obj list. Note that checkargv is
* set when read_objs is used to read objects from the target of
* ADDLIB command (ar script mode), in this case argv array possibly
* specifies the members ADDLIB want.
*/
static void
read_objs(struct bsdar *bsdar, const char *archive, int checkargv)
{
struct archive *a;
struct archive_entry *entry;
struct ar_obj *obj;
const char *name;
const char *bname;
char *buff;
char **av;
size_t size;
int i, r, find;
if ((a = archive_read_new()) == NULL)
bsdar_errc(bsdar, EX_SOFTWARE, 0, "archive_read_new failed");
archive_read_support_format_ar(a);
AC(archive_read_open_filename(a, archive, DEF_BLKSZ));
for (;;) {
r = archive_read_next_header(a, &entry);
if (r == ARCHIVE_FATAL)
bsdar_errc(bsdar, EX_DATAERR, 0, "%s",
archive_error_string(a));
if (r == ARCHIVE_EOF)
break;
if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY)
bsdar_warnc(bsdar, 0, "%s", archive_error_string(a));
if (r == ARCHIVE_RETRY) {
bsdar_warnc(bsdar, 0, "Retrying...");
continue;
}
name = archive_entry_pathname(entry);
/*
* skip pseudo members.
*/
if (strcmp(name, "/") == 0 || strcmp(name, "//") == 0)
continue;
/*
* If checkargv is set, only read those members specified
* in argv.
*/
if (checkargv && bsdar->argc > 0) {
find = 0;
for(i = 0; i < bsdar->argc; i++) {
av = &bsdar->argv[i];
if (*av == NULL)
continue;
if ((bname = basename(*av)) == NULL)
bsdar_errc(bsdar, EX_SOFTWARE, errno,
"basename failed");
if (strcmp(bname, name) != 0)
continue;
*av = NULL;
find = 1;
break;
}
if (!find)
continue;
}
size = archive_entry_size(entry);
if (size > 0) {
if ((buff = malloc(size)) == NULL)
bsdar_errc(bsdar, EX_SOFTWARE, errno,
"malloc failed");
if (archive_read_data(a, buff, size) != (ssize_t)size) {
bsdar_warnc(bsdar, 0, "%s",
archive_error_string(a));
free(buff);
continue;
}
} else
buff = NULL;
obj = malloc(sizeof(struct ar_obj));
if (obj == NULL)
bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
obj->maddr = buff;
if ((obj->name = strdup(name)) == NULL)
bsdar_errc(bsdar, EX_SOFTWARE, errno, "strdup failed");
obj->size = size;
obj->uid = archive_entry_uid(entry);
obj->gid = archive_entry_gid(entry);
obj->md = archive_entry_mode(entry);
obj->mtime = archive_entry_mtime(entry);
obj->dev = 0;
obj->ino = 0;
/*
* Objects from archive have obj->fd set to -1,
* for the ease of cleaning up.
*/
obj->fd = -1;
TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs);
}
AC(archive_read_close(a));
AC(archive_read_free(a));
}
/*
* Determine the constitution of resulting archive.
*/
static void
write_archive(struct bsdar *bsdar, char mode)
{
struct ar_obj *nobj, *obj, *obj_temp, *pos;
struct stat sb;
const char *bname;
char **av;
int i;
TAILQ_INIT(&bsdar->v_obj);
nobj = NULL;
pos = NULL;
memset(&sb, 0, sizeof(sb));
/*
* Test if the specified archive exists, to figure out
* whether we are creating one here.
*/
if (stat(bsdar->filename, &sb) != 0) {
if (errno != ENOENT) {
bsdar_warnc(bsdar, 0, "stat %s failed",
bsdar->filename);
return;
}
/* We do not create archive in mode 'd', 'm' and 's'. */
if (mode != 'r' && mode != 'q') {
bsdar_warnc(bsdar, 0, "%s: no such file",
bsdar->filename);
return;
}
/* Issue a warning if -c is not specified when creating. */
if (!(bsdar->options & AR_C))
bsdar_warnc(bsdar, 0, "creating %s", bsdar->filename);
goto new_archive;
}
/*
* First read members from existing archive.
*/
read_objs(bsdar, bsdar->filename, 0);
/*
* For mode 's', no member will be moved, deleted or replaced.
*/
if (mode == 's')
goto write_objs;
/*
* For mode 'q', we don't need to adjust existing members either.
* Also, -a, -b and -i are ignored in this mode. New members are
* always inserted at tail.
*/
if (mode == 'q')
goto new_archive;
/*
* Mode 'A' adds the contents of another archive to the tail of
* current archive. Note that mode 'A' is a special mode for the
* ADDLIB command of the ar script mode. Currently there is no
* access to this function from the ar command line mode.
*/
if (mode == 'A') {
/*
* Read objects from the target archive of ADDLIB command.
* If there are members specified in argv, read those members
* only, otherwise the entire archive will be read.
*/
read_objs(bsdar, bsdar->addlib, 1);
goto write_objs;
}
/*
* Try to find the position member specified by user.
*/
if (bsdar->options & AR_A || bsdar->options & AR_B) {
TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
if (strcmp(obj->name, bsdar->posarg) == 0) {
pos = obj;
break;
}
}
/*
* If can't find `pos' specified by user,
* silently insert objects at tail.
*/
if (pos == NULL)
bsdar->options &= ~(AR_A | AR_B);
}
for (i = 0; i < bsdar->argc; i++) {
av = &bsdar->argv[i];
TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) {
if ((bname = basename(*av)) == NULL)
bsdar_errc(bsdar, EX_SOFTWARE, errno,
"basename failed");
if (bsdar->options & AR_TR) {
if (strncmp(bname, obj->name, _TRUNCATE_LEN))
continue;
} else
if (strcmp(bname, obj->name) != 0)
continue;
if (mode == 'r') {
/*
* if the new member is not qualified
* to replace the old one, skip it.
*/
nobj = create_obj_from_file(bsdar, *av,
obj->mtime);
if (nobj == NULL)
goto skip_obj;
}
if (bsdar->options & AR_V)
(void)fprintf(stdout, "%c - %s\n", mode,
*av);
TAILQ_REMOVE(&bsdar->v_obj, obj, objs);
if (mode == 'd' || mode == 'r')
free_obj(bsdar, obj);
if (mode == 'm')
insert_obj(bsdar, obj, pos);
if (mode == 'r')
insert_obj(bsdar, nobj, pos);
skip_obj:
*av = NULL;
break;
}
}
new_archive:
/*
* When operating in mode 'r', directly add those user specified
* objects which do not exist in current archive. When operating
* in mode 'q', all objects specified in command line args are
* appended to the archive, without comparing with existing ones.
*/
for (i = 0; i < bsdar->argc; i++) {
av = &bsdar->argv[i];
if (*av != NULL && (mode == 'r' || mode == 'q')) {
nobj = create_obj_from_file(bsdar, *av, 0);
if (nobj != NULL)
insert_obj(bsdar, nobj, pos);
if (bsdar->options & AR_V && nobj != NULL)
(void)fprintf(stdout, "a - %s\n", *av);
*av = NULL;
}
}
write_objs:
write_objs(bsdar);
write_cleanup(bsdar);
}
/*
* Memory cleaning up.
*/
static void
write_cleanup(struct bsdar *bsdar)
{
struct ar_obj *obj, *obj_temp;
TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) {
TAILQ_REMOVE(&bsdar->v_obj, obj, objs);
free_obj(bsdar, obj);
}
free(bsdar->as);
free(bsdar->s_so);
free(bsdar->s_sn);
bsdar->as = NULL;
bsdar->s_so = NULL;
bsdar->s_sn = NULL;
}
/*
* Fault in the buffer prior to writing as a workaround for poor performance
* due to interaction with kernel fs deadlock avoidance code. See the comment
* above vn_io_fault_doio() in sys/kern/vfs_vnops.c for details of the issue.
*/
static void
prefault_buffer(const char *buf, size_t s)
{
volatile const char *p;
size_t page_size;
if (s == 0)
return;
page_size = sysconf(_SC_PAGESIZE);
for (p = buf; p < buf + s; p += page_size)
*p;
/*
* Ensure we touch the last page as well, in case the buffer is not
* page-aligned.
*/
*(volatile const char *)(buf + s - 1);
}
/*
* Wrapper for archive_write_data().
*/
static void
write_data(struct bsdar *bsdar, struct archive *a, const void *buf, size_t s)
{
prefault_buffer(buf, s);
if (archive_write_data(a, buf, s) != (ssize_t)s)
bsdar_errc(bsdar, EX_SOFTWARE, 0, "%s",
archive_error_string(a));
}
/*
* Write the resulting archive members.
*/
static void
write_objs(struct bsdar *bsdar)
{
struct ar_obj *obj;
struct archive *a;
struct archive_entry *entry;
size_t s_sz; /* size of archive symbol table. */
size_t pm_sz; /* size of pseudo members */
int i, nr;
if (elf_version(EV_CURRENT) == EV_NONE)
bsdar_errc(bsdar, EX_SOFTWARE, 0,
"ELF library initialization failed: %s", elf_errmsg(-1));
bsdar->rela_off = 0;
/* Create archive symbol table and archive string table, if need. */
TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
if (!(bsdar->options & AR_SS) && obj->maddr != NULL)
create_symtab_entry(bsdar, obj->maddr, obj->size);
if (strlen(obj->name) > _MAXNAMELEN_SVR4)
add_to_ar_str_table(bsdar, obj->name);
bsdar->rela_off += _ARHDR_LEN + obj->size + obj->size % 2;
}
/*
* Pad the symbol name string table. It is treated specially because
* symbol name table should be padded by a '\0', not the common '\n'
* for other members. The size of sn table includes the pad bit.
*/
if (bsdar->s_cnt != 0 && bsdar->s_sn_sz % 2 != 0)
bsdar->s_sn[bsdar->s_sn_sz++] = '\0';
/*
* Archive string table is padded by a "\n" as the normal members.
* The difference is that the size of archive string table counts
* in the pad bit, while normal members' size fileds do not.
*/
if (bsdar->as != NULL && bsdar->as_sz % 2 != 0)
bsdar->as[bsdar->as_sz++] = '\n';
/*
* If there is a symbol table, calculate the size of pseudo members,
* convert previously stored relative offsets to absolute ones, and
* then make them Big Endian.
*
* absolute_offset = htobe32(relative_offset + size_of_pseudo_members)
*/
if (bsdar->s_cnt != 0) {
s_sz = (bsdar->s_cnt + 1) * sizeof(uint32_t) + bsdar->s_sn_sz;
pm_sz = _ARMAG_LEN + (_ARHDR_LEN + s_sz);
if (bsdar->as != NULL)
pm_sz += _ARHDR_LEN + bsdar->as_sz;
for (i = 0; (size_t)i < bsdar->s_cnt; i++)
*(bsdar->s_so + i) = htobe32(*(bsdar->s_so + i) +
pm_sz);
}
if ((a = archive_write_new()) == NULL)
bsdar_errc(bsdar, EX_SOFTWARE, 0, "archive_write_new failed");
archive_write_set_format_ar_svr4(a);
AC(archive_write_open_filename(a, bsdar->filename));
/*
* write the archive symbol table, if there is one.
* If options -s is explicitly specified or we are invoked
* as ranlib, write the symbol table even if it is empty.
*/
if ((bsdar->s_cnt != 0 && !(bsdar->options & AR_SS)) ||
bsdar->options & AR_S) {
entry = archive_entry_new();
if (entry == NULL)
bsdar_errc(bsdar, EX_SOFTWARE, 0,
"archive_entry_new failed");
archive_entry_copy_pathname(entry, "/");
if ((bsdar->options & AR_D) == 0)
archive_entry_set_mtime(entry, time(NULL), 0);
archive_entry_set_size(entry, (bsdar->s_cnt + 1) *
sizeof(uint32_t) + bsdar->s_sn_sz);
AC(archive_write_header(a, entry));
nr = htobe32(bsdar->s_cnt);
write_data(bsdar, a, &nr, sizeof(uint32_t));
write_data(bsdar, a, bsdar->s_so, sizeof(uint32_t) *
bsdar->s_cnt);
write_data(bsdar, a, bsdar->s_sn, bsdar->s_sn_sz);
archive_entry_free(entry);
}
/* write the archive string table, if any. */
if (bsdar->as != NULL) {
entry = archive_entry_new();
if (entry == NULL)
bsdar_errc(bsdar, EX_SOFTWARE, 0,
"archive_entry_new failed");
archive_entry_copy_pathname(entry, "//");
archive_entry_set_size(entry, bsdar->as_sz);
AC(archive_write_header(a, entry));
write_data(bsdar, a, bsdar->as, bsdar->as_sz);
archive_entry_free(entry);
}
/* write normal members. */
TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
entry = archive_entry_new();
if (entry == NULL)
bsdar_errc(bsdar, EX_SOFTWARE, 0,
"archive_entry_new failed");
archive_entry_copy_pathname(entry, obj->name);
archive_entry_set_uid(entry, obj->uid);
archive_entry_set_gid(entry, obj->gid);
archive_entry_set_mode(entry, obj->md);
archive_entry_set_size(entry, obj->size);
archive_entry_set_mtime(entry, obj->mtime, 0);
archive_entry_set_dev(entry, obj->dev);
archive_entry_set_ino(entry, obj->ino);
archive_entry_set_filetype(entry, AE_IFREG);
AC(archive_write_header(a, entry));
write_data(bsdar, a, obj->maddr, obj->size);
archive_entry_free(entry);
}
AC(archive_write_close(a));
AC(archive_write_free(a));
}
/*
* Extract global symbols from ELF binary members.
*/
static void
create_symtab_entry(struct bsdar *bsdar, void *maddr, size_t size)
{
Elf *e;
Elf_Scn *scn;
GElf_Shdr shdr;
GElf_Sym sym;
Elf_Data *data;
char *name;
size_t n, shstrndx;
int elferr, tabndx, len, i;
if ((e = elf_memory(maddr, size)) == NULL) {
bsdar_warnc(bsdar, 0, "elf_memory() failed: %s",
elf_errmsg(-1));
return;
}
if (elf_kind(e) != ELF_K_ELF) {
/* Silently ignore non-elf member. */
elf_end(e);
return;
}
if (elf_getshstrndx(e, &shstrndx) == 0) {
bsdar_warnc(bsdar, EX_SOFTWARE, 0, "elf_getshstrndx failed: %s",
elf_errmsg(-1));
elf_end(e);
return;
}
tabndx = -1;
scn = NULL;
while ((scn = elf_nextscn(e, scn)) != NULL) {
if (gelf_getshdr(scn, &shdr) != &shdr) {
bsdar_warnc(bsdar, 0,
"elf_getshdr failed: %s", elf_errmsg(-1));
continue;
}
if ((name = elf_strptr(e, shstrndx, shdr.sh_name)) == NULL) {
bsdar_warnc(bsdar, 0,
"elf_strptr failed: %s", elf_errmsg(-1));
continue;
}
if (strcmp(name, ".strtab") == 0) {
tabndx = elf_ndxscn(scn);
break;
}
}
elferr = elf_errno();
if (elferr != 0)
bsdar_warnc(bsdar, 0, "elf_nextscn failed: %s",
elf_errmsg(elferr));
if (tabndx == -1) {
bsdar_warnc(bsdar, 0, "can't find .strtab section");
elf_end(e);
return;
}
scn = NULL;
while ((scn = elf_nextscn(e, scn)) != NULL) {
if (gelf_getshdr(scn, &shdr) != &shdr) {
bsdar_warnc(bsdar, EX_SOFTWARE, 0,
"elf_getshdr failed: %s", elf_errmsg(-1));
continue;
}
if (shdr.sh_type != SHT_SYMTAB)
continue;
data = NULL;
n = 0;
while (n < shdr.sh_size &&
(data = elf_getdata(scn, data)) != NULL) {
len = data->d_size / shdr.sh_entsize;
for (i = 0; i < len; i++) {
if (gelf_getsym(data, i, &sym) != &sym) {
bsdar_warnc(bsdar, EX_SOFTWARE, 0,
"gelf_getsym failed: %s",
elf_errmsg(-1));
continue;
}
/* keep only global or weak symbols */
if (GELF_ST_BIND(sym.st_info) != STB_GLOBAL &&
GELF_ST_BIND(sym.st_info) != STB_WEAK)
continue;
/* keep only defined symbols */
if (sym.st_shndx == SHN_UNDEF)
continue;
if ((name = elf_strptr(e, tabndx,
sym.st_name)) == NULL) {
bsdar_warnc(bsdar, EX_SOFTWARE, 0,
"elf_strptr failed: %s",
elf_errmsg(-1));
continue;
}
add_to_ar_sym_table(bsdar, name);
}
}
}
elferr = elf_errno();
if (elferr != 0)
bsdar_warnc(bsdar, EX_SOFTWARE, 0, "elf_nextscn failed: %s",
elf_errmsg(elferr));
elf_end(e);
}
/*
* Append to the archive string table buffer.
*/
static void
add_to_ar_str_table(struct bsdar *bsdar, const char *name)
{
if (bsdar->as == NULL) {
bsdar->as_cap = _INIT_AS_CAP;
bsdar->as_sz = 0;
if ((bsdar->as = malloc(bsdar->as_cap)) == NULL)
bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
}
/*
* The space required for holding one member name in as table includes:
* strlen(name) + (1 for '/') + (1 for '\n') + (possibly 1 for padding).
*/
while (bsdar->as_sz + strlen(name) + 3 > bsdar->as_cap) {
bsdar->as_cap *= 2;
bsdar->as = realloc(bsdar->as, bsdar->as_cap);
if (bsdar->as == NULL)
bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed");
}
strncpy(&bsdar->as[bsdar->as_sz], name, strlen(name));
bsdar->as_sz += strlen(name);
bsdar->as[bsdar->as_sz++] = '/';
bsdar->as[bsdar->as_sz++] = '\n';
}
/*
* Append to the archive symbol table buffer.
*/
static void
add_to_ar_sym_table(struct bsdar *bsdar, const char *name)
{
if (bsdar->s_so == NULL) {
if ((bsdar->s_so = malloc(_INIT_SYMOFF_CAP)) ==
NULL)
bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
bsdar->s_so_cap = _INIT_SYMOFF_CAP;
bsdar->s_cnt = 0;
}
if (bsdar->s_sn == NULL) {
if ((bsdar->s_sn = malloc(_INIT_SYMNAME_CAP)) == NULL)
bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
bsdar->s_sn_cap = _INIT_SYMNAME_CAP;
bsdar->s_sn_sz = 0;
}
if (bsdar->s_cnt * sizeof(uint32_t) >= bsdar->s_so_cap) {
bsdar->s_so_cap *= 2;
bsdar->s_so = realloc(bsdar->s_so, bsdar->s_so_cap);
if (bsdar->s_so == NULL)
bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed");
}
bsdar->s_so[bsdar->s_cnt] = bsdar->rela_off;
bsdar->s_cnt++;
/*
* The space required for holding one symbol name in sn table includes:
* strlen(name) + (1 for '\n') + (possibly 1 for padding).
*/
while (bsdar->s_sn_sz + strlen(name) + 2 > bsdar->s_sn_cap) {
bsdar->s_sn_cap *= 2;
bsdar->s_sn = realloc(bsdar->s_sn, bsdar->s_sn_cap);
if (bsdar->s_sn == NULL)
bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed");
}
strncpy(&bsdar->s_sn[bsdar->s_sn_sz], name, strlen(name));
bsdar->s_sn_sz += strlen(name);
bsdar->s_sn[bsdar->s_sn_sz++] = '\0';
}
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