1/*-
2 * Copyright (c) 2006 Joseph Koshy
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27
28#include <sys/types.h>
| 1/*-
2 * Copyright (c) 2006 Joseph Koshy
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27
28#include <sys/types.h>
|
30#include <sys/mman.h>
31#include <sys/stat.h>
32
33#include <ar.h>
34#include <ctype.h>
35#include "libelf.h"
36
37#include "_libelf.h"
38
39static Elf *
40_libelf_open_object(int fd, Elf_Cmd c)
41{
42 Elf *e;
43 void *m;
44 struct stat sb;
45
46 /*
47 * 'Raw' files are always mapped with 'PROT_READ'. At
48 * elf_update(3) time for files opened with ELF_C_RDWR the
49 * mapping is unmapped, file data is written to using write(2)
50 * and then the raw data is immediately mapped back in.
51 */
52 if (fstat(fd, &sb) < 0) {
53 LIBELF_SET_ERROR(IO, errno);
54 return (NULL);
55 }
56
57 m = NULL;
58 if ((m = mmap(NULL, (size_t) sb.st_size, PROT_READ, MAP_PRIVATE, fd,
59 (off_t) 0)) == MAP_FAILED) {
60 LIBELF_SET_ERROR(IO, errno);
61 return (NULL);
62 }
63
64 if ((e = elf_memory(m, (size_t) sb.st_size)) == NULL) {
65 (void) munmap(m, (size_t) sb.st_size);
66 return (NULL);
67 }
68
69 e->e_flags |= LIBELF_F_MMAP;
70 e->e_fd = fd;
71 e->e_cmd = c;
72
73 if (c == ELF_C_RDWR && e->e_kind == ELF_K_AR) {
74 (void) elf_end(e);
75 LIBELF_SET_ERROR(ARGUMENT, 0);
76 return (NULL);
77 }
78
79 return (e);
80}
81
82Elf *
83elf_begin(int fd, Elf_Cmd c, Elf *a)
84{
85 Elf *e;
86
87 e = NULL;
88
89 if (LIBELF_PRIVATE(version) == EV_NONE) {
90 LIBELF_SET_ERROR(SEQUENCE, 0);
91 return (NULL);
92 }
93
94 switch (c) {
95 case ELF_C_NULL:
96 return (NULL);
97
98 case ELF_C_WRITE:
99
100 if (a != NULL) { /* not allowed for ar(1) archives. */
101 LIBELF_SET_ERROR(ARGUMENT, 0);
102 return (NULL);
103 }
104
105 /*
106 * Check writeability of `fd' immediately and fail if
107 * not writeable.
108 */
109 if (ftruncate(fd, (off_t) 0) < 0) {
110 LIBELF_SET_ERROR(IO, errno);
111 return (NULL);
112 }
113
114 if ((e = _libelf_allocate_elf()) != NULL) {
115 _libelf_init_elf(e, ELF_K_ELF);
116 e->e_byteorder = LIBELF_PRIVATE(byteorder);
117 e->e_fd = fd;
118 e->e_cmd = c;
119 }
120 return (e);
121
122 case ELF_C_RDWR:
123 if (a != NULL) { /* not allowed for ar(1) archives. */
124 LIBELF_SET_ERROR(ARGUMENT, 0);
125 return (NULL);
126 }
127 /*FALLTHROUGH*/
128 case ELF_C_READ:
129 /*
130 * Descriptor `a' could be for a regular ELF file, or
131 * for an ar(1) archive.
132 */
133 if (a && (a->e_fd != fd || c != a->e_cmd)) {
134 LIBELF_SET_ERROR(ARGUMENT, 0);
135 return (NULL);
136 }
137
138 break;
139
140 default:
141 LIBELF_SET_ERROR(ARGUMENT, 0);
142 return (NULL);
143
144 }
145
146 if (a == NULL)
147 e = _libelf_open_object(fd, c);
148 else if (a->e_kind == ELF_K_AR)
149 e = _libelf_ar_open_member(fd, c, a);
150 else
151 (e = a)->e_activations++;
152
153 return (e);
154}
| 30#include <sys/mman.h>
31#include <sys/stat.h>
32
33#include <ar.h>
34#include <ctype.h>
35#include "libelf.h"
36
37#include "_libelf.h"
38
39static Elf *
40_libelf_open_object(int fd, Elf_Cmd c)
41{
42 Elf *e;
43 void *m;
44 struct stat sb;
45
46 /*
47 * 'Raw' files are always mapped with 'PROT_READ'. At
48 * elf_update(3) time for files opened with ELF_C_RDWR the
49 * mapping is unmapped, file data is written to using write(2)
50 * and then the raw data is immediately mapped back in.
51 */
52 if (fstat(fd, &sb) < 0) {
53 LIBELF_SET_ERROR(IO, errno);
54 return (NULL);
55 }
56
57 m = NULL;
58 if ((m = mmap(NULL, (size_t) sb.st_size, PROT_READ, MAP_PRIVATE, fd,
59 (off_t) 0)) == MAP_FAILED) {
60 LIBELF_SET_ERROR(IO, errno);
61 return (NULL);
62 }
63
64 if ((e = elf_memory(m, (size_t) sb.st_size)) == NULL) {
65 (void) munmap(m, (size_t) sb.st_size);
66 return (NULL);
67 }
68
69 e->e_flags |= LIBELF_F_MMAP;
70 e->e_fd = fd;
71 e->e_cmd = c;
72
73 if (c == ELF_C_RDWR && e->e_kind == ELF_K_AR) {
74 (void) elf_end(e);
75 LIBELF_SET_ERROR(ARGUMENT, 0);
76 return (NULL);
77 }
78
79 return (e);
80}
81
82Elf *
83elf_begin(int fd, Elf_Cmd c, Elf *a)
84{
85 Elf *e;
86
87 e = NULL;
88
89 if (LIBELF_PRIVATE(version) == EV_NONE) {
90 LIBELF_SET_ERROR(SEQUENCE, 0);
91 return (NULL);
92 }
93
94 switch (c) {
95 case ELF_C_NULL:
96 return (NULL);
97
98 case ELF_C_WRITE:
99
100 if (a != NULL) { /* not allowed for ar(1) archives. */
101 LIBELF_SET_ERROR(ARGUMENT, 0);
102 return (NULL);
103 }
104
105 /*
106 * Check writeability of `fd' immediately and fail if
107 * not writeable.
108 */
109 if (ftruncate(fd, (off_t) 0) < 0) {
110 LIBELF_SET_ERROR(IO, errno);
111 return (NULL);
112 }
113
114 if ((e = _libelf_allocate_elf()) != NULL) {
115 _libelf_init_elf(e, ELF_K_ELF);
116 e->e_byteorder = LIBELF_PRIVATE(byteorder);
117 e->e_fd = fd;
118 e->e_cmd = c;
119 }
120 return (e);
121
122 case ELF_C_RDWR:
123 if (a != NULL) { /* not allowed for ar(1) archives. */
124 LIBELF_SET_ERROR(ARGUMENT, 0);
125 return (NULL);
126 }
127 /*FALLTHROUGH*/
128 case ELF_C_READ:
129 /*
130 * Descriptor `a' could be for a regular ELF file, or
131 * for an ar(1) archive.
132 */
133 if (a && (a->e_fd != fd || c != a->e_cmd)) {
134 LIBELF_SET_ERROR(ARGUMENT, 0);
135 return (NULL);
136 }
137
138 break;
139
140 default:
141 LIBELF_SET_ERROR(ARGUMENT, 0);
142 return (NULL);
143
144 }
145
146 if (a == NULL)
147 e = _libelf_open_object(fd, c);
148 else if (a->e_kind == ELF_K_AR)
149 e = _libelf_ar_open_member(fd, c, a);
150 else
151 (e = a)->e_activations++;
152
153 return (e);
154}
|