Annotation of src/usr.bin/ranlib/build.c, Revision 1.12
1.12 ! mickey 1: /* $OpenBSD: build.c,v 1.11 2003/06/12 20:58:10 deraadt Exp $ */
1.2 deraadt 2:
1.1 deraadt 3: /*-
4: * Copyright (c) 1990 The Regents of the University of California.
5: * All rights reserved.
6: *
7: * This code is derived from software contributed to Berkeley by
8: * Hugh Smith at The University of Guelph.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
1.10 millert 18: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 19: * may be used to endorse or promote products derived from this software
20: * without specific prior written permission.
21: *
22: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32: * SUCH DAMAGE.
33: */
34:
35: #ifndef lint
36: /*static char sccsid[] = "from: @(#)build.c 5.3 (Berkeley) 3/12/91";*/
1.12 ! mickey 37: static char rcsid[] = "$OpenBSD: build.c,v 1.11 2003/06/12 20:58:10 deraadt Exp $";
1.1 deraadt 38: #endif /* not lint */
39:
40: #include <sys/types.h>
41: #include <sys/stat.h>
42: #include <errno.h>
43: #include <fcntl.h>
44: #include <a.out.h>
45: #include <dirent.h>
46: #include <unistd.h>
47: #include <ar.h>
1.5 deraadt 48: #include <limits.h>
1.1 deraadt 49: #include <ranlib.h>
50: #include <stdio.h>
1.7 espie 51: #include <stdlib.h>
1.1 deraadt 52: #include <string.h>
53: #include <archive.h>
1.7 espie 54: #include <err.h>
1.6 espie 55: #include "byte.c"
1.7 espie 56: #include "extern.h"
1.6 espie 57:
1.1 deraadt 58:
59: extern CHDR chdr; /* converted header */
60:
61: typedef struct _rlib {
62: struct _rlib *next; /* next structure */
63: off_t pos; /* offset of defining archive file */
64: char *sym; /* symbol */
65: int symlen; /* strlen(sym) */
66: } RLIB;
67: RLIB *rhead, **pnext;
68:
69: static FILE *fp;
70: static long symcnt; /* symbol count */
71: static long tsymlen; /* total string length */
72:
1.6 espie 73: static int rexec();
74: static void symobj();
1.1 deraadt 75:
1.7 espie 76: int
1.11 deraadt 77: build(void)
1.1 deraadt 78: {
79: CF cf;
80: int afd, tfd;
1.6 espie 81: int current_mid;
1.1 deraadt 82: off_t size;
83:
1.7 espie 84: current_mid = -1;
1.1 deraadt 85: afd = open_archive(O_RDWR);
86: fp = fdopen(afd, "r+");
87: tfd = tmp();
88:
89: SETCF(afd, archive, tfd, tname, RPAD|WPAD);
90:
91: /* Read through the archive, creating list of symbols. */
92: symcnt = tsymlen = 0;
93: pnext = &rhead;
94: while(get_arobj(afd)) {
1.6 espie 95: int new_mid;
96:
1.1 deraadt 97: if (!strcmp(chdr.name, RANLIBMAG)) {
98: skip_arobj(afd);
99: continue;
100: }
1.6 espie 101: new_mid = rexec(afd, tfd);
1.7 espie 102: if (new_mid != -1) {
103: if (current_mid == -1)
104: current_mid = new_mid;
105: else if (new_mid != current_mid)
106: errx(1, "Mixed object format archive: %d / %d",
107: new_mid, current_mid);
108: }
1.1 deraadt 109: put_arobj(&cf, (struct stat *)NULL);
110: }
111: *pnext = NULL;
112:
1.6 espie 113: /* Create the symbol table. Endianess the same as last mid seen */
114: symobj(current_mid);
1.1 deraadt 115:
116: /* Copy the saved objects into the archive. */
117: size = lseek(tfd, (off_t)0, SEEK_CUR);
118: (void)lseek(tfd, (off_t)0, SEEK_SET);
119: SETCF(tfd, tname, afd, archive, NOPAD);
120: copy_ar(&cf, size);
121: (void)ftruncate(afd, lseek(afd, (off_t)0, SEEK_CUR));
122: (void)close(tfd);
123:
124: /* Set the time. */
125: settime(afd);
126: close_archive(afd);
127: return(0);
128: }
129:
130: /*
131: * rexec
132: * Read the exec structure; ignore any files that don't look
1.6 espie 133: * exactly right. Return MID.
1.7 espie 134: * return -1 for files that don't look right.
135: * XXX it's hard to be sure when to ignore files, and when to error
136: * out.
1.1 deraadt 137: */
1.6 espie 138: static int
1.11 deraadt 139: rexec(int rfd, int wfd)
1.1 deraadt 140: {
1.8 mpech 141: RLIB *rp;
142: long nsyms;
143: int nr, symlen;
144: char *strtab = 0;
1.7 espie 145: char *sym;
1.1 deraadt 146: struct exec ebuf;
147: struct nlist nl;
148: off_t r_off, w_off;
149: long strsize;
1.7 espie 150: int result = -1;
1.1 deraadt 151:
152: /* Get current offsets for original and tmp files. */
153: r_off = lseek(rfd, (off_t)0, SEEK_CUR);
154: w_off = lseek(wfd, (off_t)0, SEEK_CUR);
155:
156: /* Read in exec structure. */
157: nr = read(rfd, (char *)&ebuf, sizeof(struct exec));
158: if (nr != sizeof(struct exec))
1.7 espie 159: goto bad;
1.1 deraadt 160:
161: /* Check magic number and symbol count. */
1.6 espie 162: if (BAD_OBJECT(ebuf) || ebuf.a_syms == 0)
1.7 espie 163: goto bad;
1.6 espie 164: fix_header_order(&ebuf);
1.1 deraadt 165:
166: /* Seek to string table. */
1.7 espie 167: if (lseek(rfd, N_STROFF(ebuf) + r_off, SEEK_SET) == (off_t)-1) {
168: if (errno == EINVAL)
169: goto bad;
170: else
171: error(archive);
172: }
1.1 deraadt 173:
174: /* Read in size of the string table. */
175: nr = read(rfd, (char *)&strsize, sizeof(strsize));
176: if (nr != sizeof(strsize))
1.7 espie 177: goto bad;
1.1 deraadt 178:
1.12 ! mickey 179: strsize = fix_32_order(strsize, N_GETMID(ebuf));
1.7 espie 180:
1.1 deraadt 181: /* Read in the string table. */
182: strsize -= sizeof(strsize);
183: strtab = (char *)emalloc(strsize);
184: nr = read(rfd, strtab, strsize);
1.7 espie 185: if (nr != strsize)
186: goto bad;
1.1 deraadt 187:
188: /* Seek to symbol table. */
189: if (fseek(fp, N_SYMOFF(ebuf) + r_off, SEEK_SET) == (off_t)-1)
1.7 espie 190: goto bad;
1.1 deraadt 191:
1.7 espie 192: result = N_GETMID(ebuf);
1.1 deraadt 193: /* For each symbol read the nlist entry and save it as necessary. */
194: nsyms = ebuf.a_syms / sizeof(struct nlist);
195: while (nsyms--) {
196: if (!fread((char *)&nl, sizeof(struct nlist), 1, fp)) {
197: if (feof(fp))
198: badfmt();
199: error(archive);
200: }
1.7 espie 201: fix_nlist_order(&nl, N_GETMID(ebuf));
1.1 deraadt 202:
203: /* Ignore if no name or local. */
204: if (!nl.n_un.n_strx || !(nl.n_type & N_EXT))
205: continue;
206:
207: /*
208: * If the symbol is an undefined external and the n_value
209: * field is non-zero, keep it.
210: */
211: if ((nl.n_type & N_TYPE) == N_UNDF && !nl.n_value)
212: continue;
213:
214: /* First four bytes are the table size. */
215: sym = strtab + nl.n_un.n_strx - sizeof(long);
216: symlen = strlen(sym) + 1;
217:
218: rp = (RLIB *)emalloc(sizeof(RLIB));
219: rp->sym = (char *)emalloc(symlen);
220: bcopy(sym, rp->sym, symlen);
221: rp->symlen = symlen;
222: rp->pos = w_off;
223:
224: /* Build in forward order for "ar -m" command. */
225: *pnext = rp;
226: pnext = &rp->next;
227:
228: ++symcnt;
229: tsymlen += symlen;
230: }
231:
1.7 espie 232: bad: if (nr < 0)
233: error(archive);
234: free(strtab);
235: (void)lseek(rfd, (off_t)r_off, SEEK_SET);
236: return result;
1.1 deraadt 237: }
238:
239: /*
240: * symobj --
241: * Write the symbol table into the archive, computing offsets as
1.6 espie 242: * writing. Use the right format depending on mid.
1.1 deraadt 243: */
244: static void
1.11 deraadt 245: symobj(int mid)
1.1 deraadt 246: {
1.8 mpech 247: RLIB *rp, *rnext;
1.1 deraadt 248: struct ranlib rn;
249: char hb[sizeof(struct ar_hdr) + 1], pad;
250: long ransize, size, stroff;
1.3 deraadt 251: uid_t uid;
252: gid_t gid;
1.1 deraadt 253:
254: /* Rewind the archive, leaving the magic number. */
255: if (fseek(fp, (off_t)SARMAG, SEEK_SET) == (off_t)-1)
256: error(archive);
257:
258: /* Size of the ranlib archive file, pad if necessary. */
259: ransize = sizeof(long) +
260: symcnt * sizeof(struct ranlib) + sizeof(long) + tsymlen;
261: if (ransize & 01) {
262: ++ransize;
263: pad = '\n';
264: } else
265: pad = '\0';
266:
1.3 deraadt 267: uid = getuid();
268: if (uid > USHRT_MAX) {
1.4 deraadt 269: warnx("warning: uid %u truncated to %u", uid, USHRT_MAX);
1.3 deraadt 270: uid = USHRT_MAX;
271: }
272: gid = getgid();
273: if (gid > USHRT_MAX) {
1.4 deraadt 274: warnx("warning: gid %u truncated to %u", gid, USHRT_MAX);
1.3 deraadt 275: gid = USHRT_MAX;
276: }
277:
1.1 deraadt 278: /* Put out the ranlib archive file header. */
279: #define DEFMODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)
1.9 deraadt 280: (void)snprintf(hb, sizeof hb, HDR2, RANLIBMAG, 0L, uid, gid,
1.1 deraadt 281: DEFMODE & ~umask(0), (off_t)ransize, ARFMAG);
282: if (!fwrite(hb, sizeof(struct ar_hdr), 1, fp))
283: error(tname);
284:
285: /* First long is the size of the ranlib structure section. */
1.12 ! mickey 286: size = fix_32_order(symcnt * sizeof(struct ranlib), mid);
1.1 deraadt 287: if (!fwrite((char *)&size, sizeof(size), 1, fp))
288: error(tname);
289:
290: /* Offset of the first archive file. */
291: size = SARMAG + sizeof(struct ar_hdr) + ransize;
292:
293: /*
294: * Write out the ranlib structures. The offset into the string
295: * table is cumulative, the offset into the archive is the value
296: * set in rexec() plus the offset to the first archive file.
297: */
298: for (rp = rhead, stroff = 0; rp; rp = rp->next) {
299: rn.ran_un.ran_strx = stroff;
300: stroff += rp->symlen;
301: rn.ran_off = size + rp->pos;
1.6 espie 302: fix_ranlib_order(&rn, mid);
1.1 deraadt 303: if (!fwrite((char *)&rn, sizeof(struct ranlib), 1, fp))
304: error(archive);
305: }
306:
307: /* Second long is the size of the string table. */
1.6 espie 308:
1.12 ! mickey 309: size = fix_32_order(tsymlen, mid);
1.6 espie 310: if (!fwrite((char *)&size, sizeof(size), 1, fp))
1.1 deraadt 311: error(tname);
312:
313: /* Write out the string table. */
314: for (rp = rhead; rp; rp = rnext) {
315: if (!fwrite(rp->sym, rp->symlen, 1, fp))
316: error(tname);
317: rnext = rp->next;
318: free(rp);
319: }
320: rhead = NULL;
321:
322: if (pad && !fwrite(&pad, sizeof(pad), 1, fp))
323: error(tname);
324:
325: (void)fflush(fp);
326: }
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