1de7b4b805
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. No functional change intended.
305 lines
7.7 KiB
C
305 lines
7.7 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 1998 John D. Polstra
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <ctype.h>
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#include <dirent.h>
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#include <elf-hints.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "ldconfig.h"
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#define MAXDIRS 1024 /* Maximum directories in path */
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#define MAXFILESIZE (16*1024) /* Maximum hints file size */
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static void add_dir(const char *, const char *, int);
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static void read_dirs_from_file(const char *, const char *);
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static void read_elf_hints(const char *, int);
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static void write_elf_hints(const char *);
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static const char *dirs[MAXDIRS];
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static int ndirs;
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int insecure;
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static void
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add_dir(const char *hintsfile, const char *name, int trusted)
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{
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struct stat stbuf;
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int i;
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/* Do some security checks */
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if (!trusted && !insecure) {
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if (stat(name, &stbuf) == -1) {
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warn("%s", name);
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return;
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}
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if (stbuf.st_uid != 0) {
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warnx("%s: ignoring directory not owned by root", name);
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return;
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}
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if ((stbuf.st_mode & S_IWOTH) != 0) {
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warnx("%s: ignoring world-writable directory", name);
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return;
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}
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if ((stbuf.st_mode & S_IWGRP) != 0) {
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warnx("%s: ignoring group-writable directory", name);
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return;
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}
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}
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for (i = 0; i < ndirs; i++)
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if (strcmp(dirs[i], name) == 0)
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return;
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if (ndirs >= MAXDIRS)
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errx(1, "\"%s\": Too many directories in path", hintsfile);
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dirs[ndirs++] = name;
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}
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void
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list_elf_hints(const char *hintsfile)
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{
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int i;
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int nlibs;
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read_elf_hints(hintsfile, 1);
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printf("%s:\n", hintsfile);
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printf("\tsearch directories:");
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for (i = 0; i < ndirs; i++)
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printf("%c%s", i == 0 ? ' ' : ':', dirs[i]);
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printf("\n");
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nlibs = 0;
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for (i = 0; i < ndirs; i++) {
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DIR *dirp;
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struct dirent *dp;
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if ((dirp = opendir(dirs[i])) == NULL)
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continue;
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while ((dp = readdir(dirp)) != NULL) {
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int len;
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int namelen;
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const char *name;
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const char *vers;
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/* Name can't be shorter than "libx.so.0" */
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if ((len = strlen(dp->d_name)) < 9 ||
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strncmp(dp->d_name, "lib", 3) != 0)
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continue;
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name = dp->d_name + 3;
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vers = dp->d_name + len;
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while (vers > dp->d_name && isdigit(*(vers-1)))
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vers--;
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if (vers == dp->d_name + len)
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continue;
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if (vers < dp->d_name + 4 ||
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strncmp(vers - 4, ".so.", 4) != 0)
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continue;
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/* We have a valid shared library name. */
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namelen = (vers - 4) - name;
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printf("\t%d:-l%.*s.%s => %s/%s\n", nlibs,
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namelen, name, vers, dirs[i], dp->d_name);
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nlibs++;
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}
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closedir(dirp);
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}
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}
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static void
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read_dirs_from_file(const char *hintsfile, const char *listfile)
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{
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FILE *fp;
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char buf[MAXPATHLEN];
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int linenum;
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if ((fp = fopen(listfile, "r")) == NULL)
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err(1, "%s", listfile);
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linenum = 0;
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while (fgets(buf, sizeof buf, fp) != NULL) {
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char *cp, *sp;
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linenum++;
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cp = buf;
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/* Skip leading white space. */
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while (isspace(*cp))
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cp++;
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if (*cp == '#' || *cp == '\0')
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continue;
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sp = cp;
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/* Advance over the directory name. */
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while (!isspace(*cp) && *cp != '\0')
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cp++;
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/* Terminate the string and skip trailing white space. */
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if (*cp != '\0') {
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*cp++ = '\0';
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while (isspace(*cp))
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cp++;
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}
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/* Now we had better be at the end of the line. */
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if (*cp != '\0')
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warnx("%s:%d: trailing characters ignored",
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listfile, linenum);
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if ((sp = strdup(sp)) == NULL)
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errx(1, "Out of memory");
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add_dir(hintsfile, sp, 0);
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}
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fclose(fp);
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}
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static void
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read_elf_hints(const char *hintsfile, int must_exist)
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{
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int fd;
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struct stat s;
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void *mapbase;
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struct elfhints_hdr *hdr;
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char *strtab;
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char *dirlist;
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char *p;
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if ((fd = open(hintsfile, O_RDONLY)) == -1) {
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if (errno == ENOENT && !must_exist)
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return;
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err(1, "Cannot open \"%s\"", hintsfile);
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}
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if (fstat(fd, &s) == -1)
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err(1, "Cannot stat \"%s\"", hintsfile);
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if (s.st_size > MAXFILESIZE)
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errx(1, "\"%s\" is unreasonably large", hintsfile);
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/*
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* We use a read-write, private mapping so that we can null-terminate
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* some strings in it without affecting the underlying file.
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*/
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mapbase = mmap(NULL, s.st_size, PROT_READ|PROT_WRITE,
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MAP_PRIVATE, fd, 0);
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if (mapbase == MAP_FAILED)
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err(1, "Cannot mmap \"%s\"", hintsfile);
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close(fd);
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hdr = (struct elfhints_hdr *)mapbase;
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if (hdr->magic != ELFHINTS_MAGIC)
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errx(1, "\"%s\": invalid file format", hintsfile);
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if (hdr->version != 1)
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errx(1, "\"%s\": unrecognized file version (%d)", hintsfile,
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hdr->version);
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strtab = (char *)mapbase + hdr->strtab;
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dirlist = strtab + hdr->dirlist;
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if (*dirlist != '\0')
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while ((p = strsep(&dirlist, ":")) != NULL)
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add_dir(hintsfile, p, 1);
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}
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void
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update_elf_hints(const char *hintsfile, int argc, char **argv, int merge)
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{
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int i;
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if (merge)
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read_elf_hints(hintsfile, 0);
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for (i = 0; i < argc; i++) {
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struct stat s;
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if (stat(argv[i], &s) == -1)
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warn("warning: %s", argv[i]);
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else if (S_ISREG(s.st_mode))
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read_dirs_from_file(hintsfile, argv[i]);
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else
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add_dir(hintsfile, argv[i], 0);
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}
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write_elf_hints(hintsfile);
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}
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static void
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write_elf_hints(const char *hintsfile)
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{
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struct elfhints_hdr hdr;
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char *tempname;
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int fd;
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FILE *fp;
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int i;
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if (asprintf(&tempname, "%s.XXXXXX", hintsfile) == -1)
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errx(1, "Out of memory");
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if ((fd = mkstemp(tempname)) == -1)
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err(1, "mkstemp(%s)", tempname);
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if (fchmod(fd, 0444) == -1)
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err(1, "fchmod(%s)", tempname);
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if ((fp = fdopen(fd, "wb")) == NULL)
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err(1, "fdopen(%s)", tempname);
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hdr.magic = ELFHINTS_MAGIC;
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hdr.version = 1;
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hdr.strtab = sizeof hdr;
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hdr.strsize = 0;
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hdr.dirlist = 0;
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memset(hdr.spare, 0, sizeof hdr.spare);
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/* Count up the size of the string table. */
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if (ndirs > 0) {
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hdr.strsize += strlen(dirs[0]);
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for (i = 1; i < ndirs; i++)
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hdr.strsize += 1 + strlen(dirs[i]);
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}
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hdr.dirlistlen = hdr.strsize;
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hdr.strsize++; /* For the null terminator */
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/* Write the header. */
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if (fwrite(&hdr, 1, sizeof hdr, fp) != sizeof hdr)
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err(1, "%s: write error", tempname);
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/* Write the strings. */
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if (ndirs > 0) {
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if (fputs(dirs[0], fp) == EOF)
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err(1, "%s: write error", tempname);
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for (i = 1; i < ndirs; i++)
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if (fprintf(fp, ":%s", dirs[i]) < 0)
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err(1, "%s: write error", tempname);
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}
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if (putc('\0', fp) == EOF || fclose(fp) == EOF)
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err(1, "%s: write error", tempname);
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if (rename(tempname, hintsfile) == -1)
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err(1, "rename %s to %s", tempname, hintsfile);
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free(tempname);
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}
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