1 /*
2 * Copyright (c) 1999 Global Technology Associates, Inc.
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
17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
18 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
19 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
20 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
21 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
22 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
23 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
24 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 * $FreeBSD: stable/9/usr.sbin/kgzip/kgzcmp.c 134617 2004-09-01 20:42:38Z julian $
27 */
28
29 #define _KERNEL
30 #include <sys/param.h>
31 #undef _KERNEL
32 #include <sys/types.h>
33 #include <sys/stat.h>
34 #include <sys/wait.h>
35
36 #include <err.h>
37 #include <fcntl.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <unistd.h>
41
42 #include <a.out.h>
43
44 #include "aouthdr.h"
45 #include "elfhdr.h"
46 #include "kgzip.h"
47
48 static void mk_data(const struct iodesc *i, const struct iodesc *,
49 struct kgz_hdr *, size_t);
50 static int ld_elf(const struct iodesc *, const struct iodesc *,
51 struct kgz_hdr *, const Elf32_Ehdr *);
52 static int ld_aout(const struct iodesc *, const struct iodesc *,
53 struct kgz_hdr *, const struct exec *);
54
55 /*
56 * Compress executable and output it in relocatable object format.
57 */
58 void
kgzcmp(struct kgz_hdr * kh,const char * f1,const char * f2)59 kgzcmp(struct kgz_hdr *kh, const char *f1, const char *f2)
60 {
61 struct iodesc idi, ido;
62 struct kgz_hdr khle;
63
64 if ((idi.fd = open(idi.fname = f1, O_RDONLY)) == -1)
65 err(1, "%s", idi.fname);
66 if ((ido.fd = open(ido.fname = f2, O_CREAT | O_TRUNC | O_WRONLY,
67 0666)) == -1)
68 err(1, "%s", ido.fname);
69 kh->ident[0] = KGZ_ID0;
70 kh->ident[1] = KGZ_ID1;
71 kh->ident[2] = KGZ_ID2;
72 kh->ident[3] = KGZ_ID3;
73 mk_data(&idi, &ido, kh,
74 (format == F_AOUT ? sizeof(struct kgz_aouthdr0) :
75 sizeof(struct kgz_elfhdr)) +
76 sizeof(struct kgz_hdr));
77 kh->dload &= 0xffffff;
78 kh->entry &= 0xffffff;
79 if (format == F_AOUT) {
80 struct kgz_aouthdr0 ahdr0 = aouthdr0;
81 struct kgz_aouthdr1 ahdr1 = aouthdr1;
82 unsigned x = (sizeof(struct kgz_hdr) + kh->nsize) & (16 - 1);
83 if (x) {
84 x = 16 - x;
85 xzero(&ido, x);
86 }
87 xwrite(&ido, &ahdr1, sizeof(ahdr1));
88 ahdr0.a.a_data += kh->nsize + x;
89 xseek(&ido, 0);
90 xwrite(&ido, &ahdr0, sizeof(ahdr0));
91 } else {
92 struct kgz_elfhdr ehdr = elfhdr;
93 ehdr.st[KGZ_ST_KGZ_NDATA].st_size = htole32(kh->nsize);
94 ehdr.sh[KGZ_SH_DATA].sh_size =
95 htole32(le32toh(ehdr.sh[KGZ_SH_DATA].sh_size) + kh->nsize);
96 xseek(&ido, 0);
97 xwrite(&ido, &ehdr, sizeof(ehdr));
98 }
99 khle = *kh;
100 khle.dload = htole32(khle.dload);
101 khle.dsize = htole32(khle.dsize);
102 khle.isize = htole32(khle.isize);
103 khle.entry = htole32(khle.entry);
104 khle.nsize = htole32(khle.nsize);
105 xwrite(&ido, &khle, sizeof(khle));
106 xclose(&ido);
107 xclose(&idi);
108 }
109
110 /*
111 * Make encoded (compressed) data.
112 */
113 static void
mk_data(const struct iodesc * idi,const struct iodesc * ido,struct kgz_hdr * kh,size_t off)114 mk_data(const struct iodesc * idi, const struct iodesc * ido,
115 struct kgz_hdr * kh, size_t off)
116 {
117 union {
118 struct exec ex;
119 Elf32_Ehdr ee;
120 } hdr;
121 struct stat sb;
122 struct iodesc idp;
123 int fd[2];
124 pid_t pid;
125 size_t n;
126 int fmt, status, e;
127
128 n = xread(idi, &hdr, sizeof(hdr), 0);
129 fmt = 0;
130 if (n >= sizeof(hdr.ee) && IS_ELF(hdr.ee))
131 fmt = F_ELF;
132 else if (n >= sizeof(hdr.ex) && N_GETMAGIC(hdr.ex) == ZMAGIC)
133 fmt = F_AOUT;
134 if (!fmt)
135 errx(1, "%s: Format not supported", idi->fname);
136 xseek(ido, off);
137 if (pipe(fd))
138 err(1, NULL);
139 switch (pid = fork()) {
140 case -1:
141 err(1, NULL);
142 case 0:
143 close(fd[1]);
144 dup2(fd[0], STDIN_FILENO);
145 close(fd[0]);
146 close(idi->fd);
147 dup2(ido->fd, STDOUT_FILENO);
148 close(ido->fd);
149 execlp("gzip", "gzip", "-9n", (char *)NULL);
150 warn(NULL);
151 _exit(1);
152 default:
153 close(fd[0]);
154 idp.fname = "(pipe)";
155 idp.fd = fd[1];
156 e = fmt == F_ELF ? ld_elf(idi, &idp, kh, &hdr.ee) :
157 fmt == F_AOUT ? ld_aout(idi, &idp, kh, &hdr.ex) : -1;
158 close(fd[1]);
159 if ((pid = waitpid(pid, &status, 0)) == -1)
160 err(1, NULL);
161 if (WIFSIGNALED(status) || WEXITSTATUS(status))
162 exit(1);
163 }
164 if (e)
165 errx(1, "%s: Invalid format", idi->fname);
166 if (fstat(ido->fd, &sb))
167 err(1, "%s", ido->fname);
168 kh->nsize = sb.st_size - off;
169 }
170
171 /*
172 * "Load" an ELF-format executable.
173 */
174 static int
ld_elf(const struct iodesc * idi,const struct iodesc * ido,struct kgz_hdr * kh,const Elf32_Ehdr * e)175 ld_elf(const struct iodesc * idi, const struct iodesc * ido,
176 struct kgz_hdr * kh, const Elf32_Ehdr * e)
177 {
178 Elf32_Phdr p;
179 size_t load, addr, n;
180 unsigned x, i;
181
182 load = addr = n = 0;
183 for (x = i = 0; i < e->e_phnum; i++) {
184 if (xread(idi, &p, sizeof(p),
185 e->e_phoff + i * e->e_phentsize) != e->e_phentsize)
186 return -1;
187 if (p.p_type != PT_LOAD)
188 continue;
189 if (!x)
190 load = addr = p.p_vaddr;
191 else {
192 if (p.p_vaddr < addr)
193 return -1;
194 n = p.p_vaddr - addr;
195 if (n) {
196 xzero(ido, n);
197 addr += n;
198 }
199 }
200 if (p.p_memsz < p.p_filesz)
201 return -1;
202 n = p.p_memsz - p.p_filesz;
203 xcopy(idi, ido, p.p_filesz, p.p_offset);
204 addr += p.p_filesz;
205 x++;
206 }
207 if (!x)
208 return -1;
209 kh->dload = load;
210 kh->dsize = addr - load;
211 kh->isize = kh->dsize + n;
212 kh->entry = e->e_entry;
213 return 0;
214 }
215
216 /*
217 * "Load" an a.out-format executable.
218 */
219 static int
ld_aout(const struct iodesc * idi,const struct iodesc * ido,struct kgz_hdr * kh,const struct exec * a)220 ld_aout(const struct iodesc * idi, const struct iodesc * ido,
221 struct kgz_hdr * kh, const struct exec * a)
222 {
223 size_t load, addr;
224
225 load = addr = N_TXTADDR(*a);
226 xcopy(idi, ido, le32toh(a->a_text), N_TXTOFF(*a));
227 addr += le32toh(a->a_text);
228 if (N_DATADDR(*a) != addr)
229 return -1;
230 xcopy(idi, ido, le32toh(a->a_data), N_DATOFF(*a));
231 addr += le32toh(a->a_data);
232 kh->dload = load;
233 kh->dsize = addr - load;
234 kh->isize = kh->dsize + le32toh(a->a_bss);
235 kh->entry = le32toh(a->a_entry);
236 return 0;
237 }
238