diff options
Diffstat (limited to 'ldso/util')
| -rw-r--r-- | ldso/util/Makefile | 38 | ||||
| -rw-r--r-- | ldso/util/ldconfig.c | 837 | ||||
| -rw-r--r-- | ldso/util/ldd.c | 310 | ||||
| -rw-r--r-- | ldso/util/lddstub.S | 42 | ||||
| -rw-r--r-- | ldso/util/readelf.c | 61 | ||||
| -rw-r--r-- | ldso/util/readelf.h | 4 | ||||
| -rw-r--r-- | ldso/util/readelf2.c | 115 |
7 files changed, 1407 insertions, 0 deletions
diff --git a/ldso/util/Makefile b/ldso/util/Makefile new file mode 100644 index 000000000..18e8794ba --- /dev/null +++ b/ldso/util/Makefile @@ -0,0 +1,38 @@ +TOPDIR=../../ +include $(TOPDIR)Rules.mak +include ../Config.mk + +CFLAGS += -DLDSO_ADDR="0x62f00020" # needed by ldd.o +CFLAGS += -I./ -I../../include/ +LDFLAGS += -nostdlib ../../libc.a ../../crt0.o $(GCCINCDIR)/../libgcc.a + +ALL = ldconfig ldd # lddstub + +all: $(ALL) + +CSRC= readelf.c ldconfig.c ldd.c +COBJS=$(patsubst %.c,%.o, $(CSRC)) +OBJS=$(COBJS) + +$(COBJS): %.o : %.c + $(CC) $(CFLAGS) -c $< -o $@ + $(STRIPTOOL) -x -R .note -R .comment $*.o + +readelf.o: readelf.c readelf2.c + +ldconfig: ldconfig.o readelf.o + $(CC) -static $(CFLAGS) $^ $(LDFLAGS) -o $@ + +ldd: ldd.o readelf.o + $(CC) -static $(CFLAGS) $^ $(LDFLAGS) -o $@ + +#ifeq ($(DEBUG),true) +#STUBFLAGS = -Wl,-dynamic-linker,../d-link/ld-linux.so +#endif + +#lddstub: lddstub.o +# $(CC) $(CFLAGS) $(LDFLAGS) $(STUBFLAGS) $^ -o $@ + +clean: + rm -f $(ALL) *.o *~ core + diff --git a/ldso/util/ldconfig.c b/ldso/util/ldconfig.c new file mode 100644 index 000000000..2b3d50c8e --- /dev/null +++ b/ldso/util/ldconfig.c @@ -0,0 +1,837 @@ +/* + * ldconfig - update shared library symlinks + * + * usage: ldconfig [-DvqnNX] [-f conf] [-C cache] [-r root] dir ... + * ldconfig -l [-Dv] lib ... + * ldconfig -p + * -D: debug mode, don't update links + * -v: verbose mode, print things as we go + * -q: quiet mode, don't print warnings + * -n: don't process standard directories + * -N: don't update the library cache + * -X: don't update the library links + * -l: library mode, manually link libraries + * -p: print the current library cache + * -f conf: use conf instead of /etc/ld.so.conf + * -C cache: use cache instead of /etc/ld.so.cache + * -r root: first, do a chroot to the indicated directory + * dir ...: directories to process + * lib ...: libraries to link + * + * Copyright 1994-2000 David Engel and Mitch D'Souza + * + * This program may be used for any purpose as long as this + * copyright notice is kept. + */ + +#include <stdio.h> +#include <stdlib.h> +#include <stdarg.h> +#include <string.h> +#include <ctype.h> +#include <getopt.h> +#include <dirent.h> +#include <unistd.h> +#include <a.out.h> +#include <link.h> +#include <elf.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <sys/mman.h> +#include <errno.h> + +#include "../config.h" +#include "readelf.h" + +#ifdef __GNUC__ +void warn(const char *fmt, ...) __attribute__ ((format (printf, 1, 2))); +void error(const char *fmt, ...) __attribute__ ((format (printf, 1, 2))); +#endif + +char *___strtok = NULL; + +/* For SunOS */ +#ifndef PATH_MAX +#include <limits.h> +#define PATH_MAX _POSIX_PATH_MAX +#endif + +/* For SunOS */ +#ifndef N_MAGIC +#define N_MAGIC(exec) ((exec).a_magic & 0xffff) +#endif + +#define EXIT_OK 0 +#define EXIT_FATAL 128 + +char *prog = NULL; +int debug = 0; /* debug mode */ +int verbose = 0; /* verbose mode */ +int libmode = 0; /* library mode */ +int nocache = 0; /* don't build cache */ +int nolinks = 0; /* don't update links */ + +char *conffile = LDSO_CONF; /* default conf file */ +char *cachefile = LDSO_CACHE; /* default cache file */ +void cache_print(void); +void cache_dolib(const char *dir, const char *so, int libtype); +void cache_write(void); + +void warn(const char *fmt, ...) +{ + va_list ap; + + if (verbose < 0) + return; + + fflush(stdout); /* don't mix output and error messages */ + fprintf(stderr, "%s: warning: ", prog); + + va_start(ap, fmt); + vfprintf(stderr, fmt, ap); + va_end(ap); + + fprintf(stderr, "\n"); + + return; +} + +void error(const char *fmt, ...) +{ + va_list ap; + + fflush(stdout); /* don't mix output and error messages */ + fprintf(stderr, "%s: ", prog); + + va_start(ap, fmt); + vfprintf(stderr, fmt, ap); + va_end(ap); + + fprintf(stderr, "\n"); + + exit(EXIT_FATAL); +} + +void *xmalloc(size_t size) +{ + void *ptr; + if ((ptr = malloc(size)) == NULL) + error("out of memory"); + return ptr; +} + +char *xstrdup(const char *str) +{ + char *ptr; + if ((ptr = strdup(str)) == NULL) + error("out of memory"); + return ptr; +} + +/* If shared library, return a malloced copy of the soname and set the + type, else return NULL. + + expected_type should be either LIB_ANY or one of the following:- + LIB_DLL + LIB_ELF + LIB_ELF_LIBC5 + LIB_ELF_LIBC6 + + If the lib is ELF and we can not deduce the type the type will + be set based on expected_type. + + If the expected, actual/deduced types missmatch we display a warning + and use the actual/deduced type. +*/ +char *is_shlib(const char *dir, const char *name, int *type, + int *islink, int expected_type) +{ + char *good = NULL; + char *cp, *cp2; + FILE *file; + struct exec exec; + ElfW(Ehdr) *elf_hdr; + struct stat statbuf; + char buff[4096]; + + /* see if name is of the form libZ.so* */ + if ((strncmp(name, "lib", 3) == 0 || strncmp(name, "ld-", 3) == 0) && \ + name[strlen(name)-1] != '~' && (cp = strstr(name, ".so"))) + { + /* find the start of the Vminor part, if any */ + if (cp[3] == '.' && (cp2 = strchr(cp + 4, '.'))) + cp = cp2; + else + cp = cp + strlen(cp); + + /* construct the full path name */ + sprintf(buff, "%s%s%s", dir, (*dir && strcmp(dir, "/")) ? + "/" : "", name); + + /* first, make sure it's a regular file */ + if (lstat(buff, &statbuf)) + warn("can't lstat %s (%s), skipping", buff, strerror(errno)); + else if (!S_ISREG(statbuf.st_mode) && !S_ISLNK(statbuf.st_mode)) + warn("%s is not a regular file or symlink, skipping", buff); + else + { + /* is it a regular file or a symlink */ + *islink = S_ISLNK(statbuf.st_mode); + + /* then try opening it */ + if (!(file = fopen(buff, "rb"))) + warn("can't open %s (%s), skipping", buff, strerror(errno)); + else + { + /* now make sure it's a shared library */ + if (fread(&exec, sizeof exec, 1, file) < 1) + warn("can't read header from %s, skipping", buff); + else if (N_MAGIC(exec) != ZMAGIC && N_MAGIC(exec) != QMAGIC) + { + elf_hdr = (ElfW(Ehdr) *) &exec; + if (elf_hdr->e_ident[0] != 0x7f || + strncmp(&elf_hdr->e_ident[1], "ELF",3) != 0) + { + /* silently ignore linker scripts */ + if (strncmp((char *)&exec, "/* GNU ld", 9) != 0) + warn("%s is not a shared library, skipping", buff); + } + else + { + /* always call readsoname to update type */ + if(expected_type == LIB_DLL){ + warn("%s is not an a.out library, its ELF!\n", buff); + expected_type=LIB_ANY; + } + *type = LIB_ELF; + good = readsoname(buff, file, expected_type, type, + elf_hdr->e_ident[EI_CLASS]); + if (good == NULL || *islink) + { + if (good != NULL) + free(good); + good = xstrdup(name); + } + else + { + /* if the soname does not match the filename, + issue a warning, but only in debug mode. */ + int len = strlen(good); + if (debug && (strncmp(good, name, len) != 0 || + (name[len] != '\0' && name[len] != '.'))) + warn("%s has inconsistent soname (%s)", + buff, good); + } + } + } + else + { + if (*islink) + good = xstrdup(name); + else + { + good = xmalloc(cp - name + 1); + strncpy(good, name, cp - name); + good[cp - name] = '\0'; + } + if(expected_type != LIB_ANY && expected_type != LIB_DLL) + { + warn("%s is not an ELF library, its an a.out DLL!", buff); + expected_type=LIB_ANY; + } + + *type = LIB_DLL; + } + fclose(file); + } + } + } + + return good; +} + +/* update the symlink to new library */ +void link_shlib(const char *dir, const char *file, const char *so) +{ + int change = 1; + char libname[4096]; + char linkname[4096]; + struct stat libstat; + struct stat linkstat; + + /* construct the full path names */ + sprintf(libname, "%s/%s", dir, file); + sprintf(linkname, "%s/%s", dir, so); + + /* see if a link already exists */ + if (!stat(linkname, &linkstat)) + { + /* now see if it's the one we want */ + if (stat(libname, &libstat)) + warn("can't stat %s (%s)", libname, strerror(errno)); + else if (libstat.st_dev == linkstat.st_dev && + libstat.st_ino == linkstat.st_ino) + change = 0; + } + + /* then update the link, if required */ + if (change > 0 && !nolinks) + { + if (!lstat(linkname, &linkstat)) + { + if (!S_ISLNK(linkstat.st_mode)) + { + warn("%s is not a symlink", linkname); + change = -1; + } + else if (remove(linkname)) + { + warn("can't unlink %s (%s)", linkname, strerror(errno)); + change = -1; + } + } + if (change > 0) + { + if (symlink(file, linkname)) + { + warn("can't link %s to %s (%s)", linkname, file, strerror(errno)); + change = -1; + } + } + } + + /* some people like to know what we're doing */ + if (verbose > 0) + printf("\t%s => %s%s\n", so, file, + change < 0 ? " (SKIPPED)" : + (change > 0 ? " (changed)" : "")); + + return; +} + +/* figure out which library is greater */ +int libcmp(char *p1, char *p2) +{ + while (*p1) + { + if (isdigit(*p1) && isdigit(*p2)) + { + /* must compare this numerically */ + int v1, v2; + v1 = strtoul(p1, &p1, 10); + v2 = strtoul(p2, &p2, 10); + if (v1 != v2) + return v1 - v2; + } + else if (isdigit(*p1) && !isdigit(*p2)) + return 1; + else if (!isdigit(*p1) && isdigit(*p2)) + return -1; + else if (*p1 != *p2) + return *p1 - *p2; + else + p1++, p2++; + } + + return *p1 - *p2; +} + +struct lib +{ + char *so; /* soname of a library */ + char *name; /* name of a library */ + int libtype; /* type of a library */ + int islink; /* is it a symlink */ + struct lib *next; /* next library in list */ +}; + +/* update all shared library links in a directory */ +void scan_dir(const char *name) +{ + DIR *dir; + struct dirent *ent; + char *so; + struct lib *lp, *libs = NULL; + int libtype, islink; + int expected_type = LIB_ANY; + char *t; + + /* Check for an embedded expected type */ + t=strrchr(name, '='); + if( t ) + { + *t++ = '\0'; /* Skip = char */ + if(strcasecmp(t, "libc4") == 0) + { + expected_type = LIB_DLL; + } + else + { + if(strcasecmp(t, "libc5") == 0) + { + expected_type = LIB_ELF_LIBC5; + } + else + { + if(strcasecmp(t, "libc6") == 0) + { + expected_type = LIB_ELF_LIBC6; + } + else + { + warn("Unknown type field '%s' for dir '%s' - ignored\n", t, name); + expected_type = LIB_ANY; + } + } + } + } + + /* let 'em know what's going on */ + if (verbose > 0) + printf("%s:\n", name); + + /* if we can't open it, we can't do anything */ + if ((dir = opendir(name)) == NULL) + { + warn("can't open %s (%s), skipping", name, strerror(errno)); + return; + } + + /* yes, we have to look at every single file */ + while ((ent = readdir(dir)) != NULL) + { + /* if it's not a shared library, don't bother */ + if ((so = is_shlib(name, ent->d_name, &libtype, &islink, expected_type)) == NULL) + continue; + + /* have we already seen one with the same so name? */ + for (lp = libs; lp; lp = lp->next) + { + if (strcmp(so, lp->so) == 0) + { + /* we have, which one do we want to use? */ + if ((!islink && lp->islink) || + (islink == lp->islink && + libcmp(ent->d_name, lp->name) > 0)) + { + /* let's use the new one */ + free(lp->name); + lp->name = xstrdup(ent->d_name); + lp->libtype = libtype; + lp->islink = islink; + } + break; + } + } + + /* congratulations, you're the first one we've seen */ + if (!lp) + { + lp = xmalloc(sizeof *lp); + lp->so = xstrdup(so); + lp->name = xstrdup(ent->d_name); + lp->libtype = libtype; + lp->islink = islink; + lp->next = libs; + libs = lp; + } + + free(so); + } + + /* don't need this any more */ + closedir(dir); + + /* now we have all the latest libs, update the links */ + for (lp = libs; lp; lp = lp->next) + { + if (!lp->islink) + link_shlib(name, lp->name, lp->so); + if (!nocache) + cache_dolib(name, lp->so, lp->libtype); + } + + /* always try to clean up after ourselves */ + while (libs) + { + lp = libs->next; + free(libs->so); + free(libs->name); + free(libs); + libs = lp; + } + + return; +} + +/* return the list of system-specific directories */ +char *get_extpath(void) +{ + char *res = NULL, *cp; + FILE *file; + struct stat stat; + + if ((file = fopen(conffile, "r")) != NULL) + { + fstat(fileno(file), &stat); + res = xmalloc(stat.st_size + 1); + fread(res, 1, stat.st_size, file); + fclose(file); + res[stat.st_size] = '\0'; + + /* convert comments fo spaces */ + for (cp = res; *cp; /*nada*/) { + if (*cp == '#') { + do + *cp++ = ' '; + while (*cp && *cp != '\n'); + } else { + cp++; + } + } + } + + return res; +} + +void usage(void) +{ + fprintf(stderr, + "ldconfig - update shared library symlinks\n" + "\n" + "usage: ldconfig [-DvqnNX] [-f conf] [-C cache] [-r root] dir ...\n" + " ldconfig -l [-Dv] lib ...\n" + " ldconfig -p\n" + "\t-D:\t\tdebug mode, don't update links\n" + "\t-v:\t\tverbose mode, print things as we go\n" + "\t-q:\t\tquiet mode, don't print warnings\n" + "\t-n:\t\tdon't process standard directories\n" + "\t-N:\t\tdon't update the library cache\n" + "\t-X:\t\tdon't update the library links\n" + "\t-l:\t\tlibrary mode, manually link libraries\n" + "\t-p:\t\tprint the current library cache\n" + "\t-f conf :\tuse conf instead of %s\n" + "\t-C cache:\tuse cache instead of %s\n" + "\t-r root :\tfirst, do a chroot to the indicated directory\n" + "\tdir ... :\tdirectories to process\n" + "\tlib ... :\tlibraries to link\n" + "\n" + "Copyright 1994-2000 David Engel and Mitch D'Souza\n", + LDSO_CONF, LDSO_CACHE + ); + exit(EXIT_FATAL); +} + +int main(int argc, char **argv) +{ + int i, c; + int nodefault = 0; + int printcache = 0; + char *cp, *dir, *so; + char *extpath; + int libtype, islink; + char *chroot_dir = NULL; + + prog = argv[0]; + opterr = 0; + + while ((c = getopt(argc, argv, "DvqnNXlpf:C:r:")) != EOF) + switch (c) + { + case 'D': + debug = 1; /* debug mode */ + nocache = 1; + nolinks = 1; + verbose = 1; + break; + case 'v': + verbose = 1; /* verbose mode */ + break; + case 'q': + if (verbose <= 0) + verbose = -1; /* quiet mode */ + break; + case 'n': + nodefault = 1; /* no default dirs */ + nocache = 1; + break; + case 'N': + nocache = 1; /* don't build cache */ + break; + case 'X': + nolinks = 1; /* don't update links */ + break; + case 'l': + libmode = 1; /* library mode */ + break; + case 'p': + printcache = 1; /* print cache */ + break; + case 'f': + conffile = optarg; /* alternate conf file */ + break; + case 'C': + cachefile = optarg; /* alternate cache file */ + break; + case 'r': + chroot_dir = optarg; + break; + default: + usage(); + break; + + /* THE REST OF THESE ARE UNDOCUMENTED AND MAY BE REMOVED + IN FUTURE VERSIONS. */ + } + + if (chroot_dir && *chroot_dir) { + if (chroot(chroot_dir) < 0) + error("couldn't chroot to %s (%s)", chroot_dir, strerror(errno)); + if (chdir("/") < 0) + error("couldn't chdir to / (%s)", strerror(errno)); + } + + /* allow me to introduce myself, hi, my name is ... */ + if (verbose > 0) + printf("%s: version %s\n", argv[0], VERSION); + + if (printcache) + { + /* print the cache -- don't you trust me? */ + cache_print(); + exit(EXIT_OK); + } + else if (libmode) + { + /* so you want to do things manually, eh? */ + + /* ok, if you're so smart, which libraries do we link? */ + for (i = optind; i < argc; i++) + { + /* split into directory and file parts */ + if (!(cp = strrchr(argv[i], '/'))) + { + dir = "."; /* no dir, only a filename */ + cp = argv[i]; + } + else + { + if (cp == argv[i]) + dir = "/"; /* file in root directory */ + else + dir = argv[i]; + *cp++ = '\0'; /* neither of the above */ + } + + /* we'd better do a little bit of checking */ + if ((so = is_shlib(dir, cp, &libtype, &islink, LIB_ANY)) == NULL) + error("%s%s%s is not a shared library", dir, + (*dir && strcmp(dir, "/")) ? "/" : "", cp); + + /* so far, so good, maybe he knows what he's doing */ + link_shlib(dir, cp, so); + } + } + else + { + /* the lazy bum want's us to do all the work for him */ + + /* don't cache dirs on the command line */ + int nocache_save = nocache; + nocache = 1; + + /* OK, which directories should we do? */ + for (i = optind; i < argc; i++) + scan_dir(argv[i]); + + /* restore the desired caching state */ + nocache = nocache_save; + + /* look ma, no defaults */ + if (!nodefault) + { + /* I guess the defaults aren't good enough */ + if ((extpath = get_extpath())) + { + for (cp = strtok(extpath, DIR_SEP); cp; + cp = strtok(NULL, DIR_SEP)) + scan_dir(cp); + free(extpath); + } + +#ifdef UCLIBC_DEVEL + scan_dir(UCLIBC_INSTALL_DIR"/lib"); +#else + /* everybody needs these, don't they? */ + scan_dir("/usr/lib"); + scan_dir("/lib"); +#endif + } + + if (!nocache) + cache_write(); + } + + exit(EXIT_OK); +} + +typedef struct liblist +{ + int flags; + int sooffset; + int liboffset; + char *soname; + char *libname; + struct liblist *next; +} liblist_t; + +static header_t magic = { LDSO_CACHE_MAGIC, LDSO_CACHE_VER, 0 }; +static liblist_t *lib_head = NULL; + +static int liblistcomp(liblist_t *x, liblist_t *y) +{ + int res; + + if ((res = libcmp(x->soname, y->soname)) == 0) + { + res = libcmp(strrchr(x->libname, '/') + 1, + strrchr(y->libname, '/') + 1); + } + + return res; +} + +void cache_dolib(const char *dir, const char *so, int libtype) +{ + char fullpath[PATH_MAX]; + liblist_t *new_lib, *cur_lib; + + magic.nlibs++; + sprintf(fullpath, "%s/%s", dir, so); + new_lib = xmalloc(sizeof (liblist_t)); + new_lib->flags = libtype; + new_lib->soname = xstrdup(so); + new_lib->libname = xstrdup(fullpath); + + if (lib_head == NULL || liblistcomp(new_lib, lib_head) > 0) + { + new_lib->next = lib_head; + lib_head = new_lib; + } + else + { + for (cur_lib = lib_head; cur_lib->next != NULL && + liblistcomp(new_lib, cur_lib->next) <= 0; + cur_lib = cur_lib->next) + /* nothing */; + new_lib->next = cur_lib->next; + cur_lib->next = new_lib; + } +} + +void cache_write(void) +{ + int cachefd; + int stroffset = 0; + char tempfile[4096]; + liblist_t *cur_lib; + + if (!magic.nlibs) + return; + + sprintf(tempfile, "%s~", cachefile); + + if (unlink(tempfile) && errno != ENOENT) + error("can't unlink %s (%s)", tempfile, strerror(errno)); + + if ((cachefd = creat(tempfile, 0644)) < 0) + error("can't create %s (%s)", tempfile, strerror(errno)); + + if (write(cachefd, &magic, sizeof (header_t)) != sizeof (header_t)) + error("can't write %s (%s)", tempfile, strerror(errno)); + + for (cur_lib = lib_head; cur_lib != NULL; cur_lib = cur_lib->next) + { + cur_lib->sooffset = stroffset; + stroffset += strlen(cur_lib->soname) + 1; + cur_lib->liboffset = stroffset; + stroffset += strlen(cur_lib->libname) + 1; + if (write(cachefd, cur_lib, sizeof (libentry_t)) != + sizeof (libentry_t)) + error("can't write %s (%s)", tempfile, strerror(errno)); + } + + for (cur_lib = lib_head; cur_lib != NULL; cur_lib = cur_lib->next) + { + if (write(cachefd, cur_lib->soname, strlen(cur_lib->soname) + 1) + != strlen(cur_lib->soname) + 1) + error("can't write %s (%s)", tempfile, strerror(errno)); + if (write(cachefd, cur_lib->libname, strlen(cur_lib->libname) + 1) + != strlen(cur_lib->libname) + 1) + error("can't write %s (%s)", tempfile, strerror(errno)); + } + + if (close(cachefd)) + error("can't close %s (%s)", tempfile, strerror(errno)); + + if (chmod(tempfile, 0644)) + error("can't chmod %s (%s)", tempfile, strerror(errno)); + + if (rename(tempfile, cachefile)) + error("can't rename %s (%s)", tempfile, strerror(errno)); +} + +void cache_print(void) +{ + caddr_t c; + struct stat st; + int fd = 0; + char *strs; + header_t *header; + libentry_t *libent; + + if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY))<0) + error("can't read %s (%s)", cachefile, strerror(errno)); + if ((c = mmap(0,st.st_size, PROT_READ, MAP_SHARED ,fd, 0)) == (caddr_t)-1) + error("can't map %s (%s)", cachefile, strerror(errno)); + close(fd); + + if (memcmp(((header_t *)c)->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN)) + error("%s cache corrupt", cachefile); + + if (memcmp(((header_t *)c)->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN)) + error("wrong cache version - expected %s", LDSO_CACHE_VER); + + header = (header_t *)c; + libent = (libentry_t *)(c + sizeof (header_t)); + strs = (char *)&libent[header->nlibs]; + + printf("%d libs found in cache `%s' (version %s)\n", + header->nlibs, cachefile, LDSO_CACHE_VER); + + for (fd = 0; fd < header->nlibs; fd++) + { + printf("\t%s ", strs + libent[fd].sooffset); + switch (libent[fd].flags & ~LIB_ELF64) + { + case LIB_DLL: + printf("(libc4)"); + break; + case LIB_ELF: + printf("(ELF%s)", libent[fd].flags & LIB_ELF64 ? "/64" : ""); + break; + case LIB_ELF_LIBC5: + case LIB_ELF_LIBC6: + printf("(libc%d%s)", (libent[fd].flags & ~LIB_ELF64) + 3, + libent[fd].flags & LIB_ELF64 ? "/64" : ""); + break; + default: + printf("(unknown)"); + break; + } + printf(" => %s\n", strs + libent[fd].liboffset); + } + + munmap (c,st.st_size); +} + diff --git a/ldso/util/ldd.c b/ldso/util/ldd.c new file mode 100644 index 000000000..62c479ba3 --- /dev/null +++ b/ldso/util/ldd.c @@ -0,0 +1,310 @@ +/* + * ldd - print shared library dependencies + * + * usage: ldd [-vVdr] prog ... + * -v: print ldd version + * -V: print ld.so version + * -d: Perform relocations and report any missing functions. (ELF only). + * -r: Perform relocations for both data objects and functions, and + * report any missing objects (ELF only). + * prog ...: programs to check + * + * Copyright 1993-2000, David Engel + * + * This program may be used for any purpose as long as this + * copyright notice is kept. + */ + +#include <stdio.h> +#include <stdlib.h> +#include <stdarg.h> +#include <string.h> +#include <getopt.h> +#include <unistd.h> +#include <a.out.h> +#include <errno.h> +#include <sys/wait.h> +#include <linux/elf.h> +#include "../config.h" +#include "readelf.h" + +#ifdef __GNUC__ +void warn(char *fmt, ...) __attribute__ ((format (printf, 1, 2))); +void error(char *fmt, ...) __attribute__ ((format (printf, 1, 2))); +#endif + +char *prog = NULL; + +void warn(char *fmt, ...) +{ + va_list ap; + + fflush(stdout); /* don't mix output and error messages */ + fprintf(stderr, "%s: warning: ", prog); + + va_start(ap, fmt); + vfprintf(stderr, fmt, ap); + va_end(ap); + + fprintf(stderr, "\n"); + + return; +} + +void error(char *fmt, ...) +{ + va_list ap; + + fflush(stdout); /* don't mix output and error messages */ + fprintf(stderr, "%s: ", prog); + + va_start(ap, fmt); + vfprintf(stderr, fmt, ap); + va_end(ap); + + fprintf(stderr, "\n"); + + exit(1); +} + +void *xmalloc(size_t size) +{ + void *ptr; + if ((ptr = malloc(size)) == NULL) + error("out of memory"); + return ptr; +} + +char *xstrdup(char *str) +{ + char *ptr; + if ((ptr = strdup(str)) == NULL) + error("out of memory"); + return ptr; +} + +/* see if prog is a binary file */ +int is_bin(char *argv0, char *prog) +{ + int res = 0; + FILE *file; + struct exec exec; + char *cp; + int libtype; + + /* must be able to open it for reading */ + if ((file = fopen(prog, "rb")) == NULL) + fprintf(stderr, "%s: can't open %s (%s)\n", argv0, prog, + strerror(errno)); + else + { + /* then see if it's Z, Q or OMAGIC */ + if (fread(&exec, sizeof exec, 1, file) < 1) + fprintf(stderr, "%s: can't read header from %s\n", argv0, prog); + else if (N_MAGIC(exec) != ZMAGIC && N_MAGIC(exec) != QMAGIC && + N_MAGIC(exec) != OMAGIC) + { + struct elfhdr elf_hdr; + + rewind(file); + fread(&elf_hdr, sizeof elf_hdr, 1, file); + if (elf_hdr.e_ident[0] != 0x7f || + strncmp(elf_hdr.e_ident+1, "ELF", 3) != 0) + fprintf(stderr, "%s: %s is not a.out or ELF\n", argv0, prog); + else + { + struct elf_phdr phdr; + int i; + + /* Check its an exectuable, library or other */ + switch (elf_hdr.e_type) + { + case ET_EXEC: + res = 3; + /* then determine if it is dynamic ELF */ + for (i=0; i<elf_hdr.e_phnum; i++) + { + fread(&phdr, sizeof phdr, 1, file); + if (phdr.p_type == PT_DYNAMIC) + { + res = 2; + break; + } + } + break; + case ET_DYN: + if ((cp = readsoname(prog, file, LIB_ANY, &libtype, + elf_hdr.e_ident[EI_CLASS])) != NULL) + free(cp); + if (libtype == LIB_ELF_LIBC5) + res = 5; + else + res = 4; + break; + default: + res = 0; + break; + } + } + } + else + res = 1; /* looks good */ + + fclose(file); + } + return res; +} + +int main(int argc, char **argv, char **envp) +{ + int i; + int vprinted = 0; + int resolve = 0; + int bind = 0; + int bintype; + char *ld_preload; + int status = 0; + + /* this must be volatile to work with -O, GCC bug? */ + volatile loadptr loader = (loadptr)LDSO_ADDR; + + prog = argv[0]; + + while ((i = getopt(argc, argv, "drvV")) != EOF) + switch (i) + { + case 'v': + /* print our version number */ + printf("%s: version %s\n", argv[0], VERSION); + vprinted = 1; + break; + case 'd': + bind = 1; + break; + case 'r': + resolve = 1; + break; + case 'V': + /* print the version number of ld.so */ + if (uselib(LDSO_IMAGE)) + { + fprintf(stderr, "%s: can't load dynamic linker %s (%s)\n", + argv[0], LDSO_IMAGE, strerror(errno)); + exit(1); + } + loader(FUNC_VERS, NULL); + vprinted = 1; + break; + } + + /* must specify programs if -v or -V not used */ + if (optind >= argc && !vprinted) + { + printf("usage: %s [-vVdr] prog ...\n", argv[0]); + exit(0); + } + + /* setup the environment for ELF binaries */ + putenv("LD_TRACE_LOADED_OBJECTS=1"); + if (resolve || bind) + putenv("LD_BIND_NOW=1"); + if (resolve) + putenv("LD_WARN=1"); + ld_preload = getenv("LD_PRELOAD"); + + /* print the dependencies for each program */ + for (i = optind; i < argc; i++) + { + pid_t pid; + char buff[1024]; + + /* make sure it's a binary file */ + if (!(bintype = is_bin(argv[0], argv[i]))) + { + status = 1; + continue; + } + + /* print the program name if doing more than one */ + if (optind < argc-1) + { + printf("%s:\n", argv[i]); + fflush(stdout); + } + + /* no need to fork/exec for static ELF program */ + if (bintype == 3) + { + printf("\tstatically linked (ELF)\n"); + continue; + } + + /* now fork and exec prog with argc = 0 */ + if ((pid = fork()) < 0) + { + fprintf(stderr, "%s: can't fork (%s)\n", argv[0], strerror(errno)); + exit(1); + } + else if (pid == 0) + { + switch (bintype) + { + case 1: /* a.out */ + /* save the name in the enviroment, ld.so may need it */ + snprintf(buff, sizeof buff, "%s=%s", LDD_ARGV0, argv[i]); + putenv(buff); + execl(argv[i], NULL); + break; + case 2: /* ELF program */ + execl(argv[i], argv[i], NULL); + break; + case 4: /* ELF libc6 library */ + /* try to use /lib/ld-linux.so.2 first */ +#if !defined(__mc68000__) + execl("/lib/ld-linux.so.2", "/lib/ld-linux.so.2", + "--list", argv[i], NULL); +#else + execl("/lib/ld.so.1", "/lib/ld.so.1", + "--list", argv[i], NULL); +#endif + /* fall through */ + case 5: /* ELF libc5 library */ + /* if that fails, add library to LD_PRELOAD and + then execute lddstub */ + if (ld_preload && *ld_preload) + snprintf(buff, sizeof buff, "LD_PRELOAD=%s:%s%s", + ld_preload, *argv[i] == '/' ? "" : "./", argv[i]); + else + snprintf(buff, sizeof buff, "LD_PRELOAD=%s%s", + *argv[i] == '/' ? "" : "./", argv[i]); + putenv(buff); + execl(LDDSTUB, argv[i], NULL); + break; + default: + fprintf(stderr, "%s: internal error, bintype = %d\n", + argv[0], bintype); + exit(1); + } + fprintf(stderr, "%s: can't execute %s (%s)\n", argv[0], argv[i], + strerror(errno)); + exit(1); + } + else + { + /* then wait for it to complete */ + int status; + if (waitpid(pid, &status, 0) != pid) + { + fprintf(stderr, "%s: error waiting for %s (%s)\n", argv[0], + argv[i], strerror(errno)); + } + else if (WIFSIGNALED(status)) + { + fprintf(stderr, "%s: %s exited with signal %d\n", argv[0], + argv[i], WTERMSIG(status)); + } + } + } + + exit(status); +} diff --git a/ldso/util/lddstub.S b/ldso/util/lddstub.S new file mode 100644 index 000000000..33a67ee8d --- /dev/null +++ b/ldso/util/lddstub.S @@ -0,0 +1,42 @@ + .text +.globl main +.globl exit +main: +exit: +#if defined(__i386__) + movl $1,%eax + movl $0,%ebx + int $0x80 +#elif defined(__mc68000__) + movel #1,%d0 + clrl %d1 + trap #0 +#elif defined(__sparc__) + mov 1,%g1 + mov 0,%o0 + t 0x10 +#else +#error Only know how to support i386, m68k and sparc architectures +#endif + +.globl atexit +.globl __libc_init +.globl __setfpucw +atexit: +__libc_init: +__setfpucw: +#if defined(__i386__) + ret +#elif defined(__mc68000__) + rts +#elif defined(__sparc__) + ret + nop +#else +#error Only know how to support i386, m68k and sparc architectures +#endif + + .data +.globl __fpu_control +__fpu_control: + .long 0 diff --git a/ldso/util/readelf.c b/ldso/util/readelf.c new file mode 100644 index 000000000..ba93d2d31 --- /dev/null +++ b/ldso/util/readelf.c @@ -0,0 +1,61 @@ +/* adapted from Eric Youngdale's readelf program */ + +#include <stdio.h> +#include <string.h> +#include <sys/stat.h> +#include <sys/mman.h> +#include <link.h> +#include <elf.h> +#include <unistd.h> +#include "../config.h" +#include "readelf.h" +#include <sys/types.h> + +void warn(char *fmt, ...); +char *xstrdup(char *); + +struct needed_tab +{ + char *soname; + int type; +}; + +struct needed_tab needed_tab[] = { + { "libc.so.5", LIB_ELF_LIBC5 }, + { "libm.so.5", LIB_ELF_LIBC5 }, + { "libdl.so.1", LIB_ELF_LIBC5 }, + { "libc.so.6", LIB_ELF_LIBC6 }, + { "libm.so.6", LIB_ELF_LIBC6 }, + { "libdl.so.2", LIB_ELF_LIBC6 }, + { NULL, LIB_ELF } +}; + +char *readsoname(char *name, FILE *infile, int expected_type, + int *type, int elfclass) +{ + char *res; + + if (elfclass == ELFCLASS32) + res = readsoname32(name, infile, expected_type, type); + else + { + res = readsoname64(name, infile, expected_type, type); +#if 0 + *type |= LIB_ELF64; +#endif + } + + return res; +} + +#undef __ELF_NATIVE_CLASS +#undef readsonameXX +#define readsonameXX readsoname32 +#define __ELF_NATIVE_CLASS 32 +#include "readelf2.c" + +#undef __ELF_NATIVE_CLASS +#undef readsonameXX +#define readsonameXX readsoname64 +#define __ELF_NATIVE_CLASS 64 +#include "readelf2.c" diff --git a/ldso/util/readelf.h b/ldso/util/readelf.h new file mode 100644 index 000000000..78d2216e0 --- /dev/null +++ b/ldso/util/readelf.h @@ -0,0 +1,4 @@ +char *readsoname(char *name, FILE *file, int expected_type, + int *type, int elfclass); +char *readsoname32(char *name, FILE *file, int expected_type, int *type); +char *readsoname64(char *name, FILE *file, int expected_type, int *type); diff --git a/ldso/util/readelf2.c b/ldso/util/readelf2.c new file mode 100644 index 000000000..1bf47b7c6 --- /dev/null +++ b/ldso/util/readelf2.c @@ -0,0 +1,115 @@ +char *readsonameXX(char *name, FILE *infile, int expected_type, int *type) +{ + ElfW(Ehdr) *epnt; + ElfW(Phdr) *ppnt; + int i, j; + char *header; + ElfW(Word) dynamic_addr = 0; + ElfW(Word) dynamic_size = 0; + unsigned long page_size = getpagesize(); + ElfW(Word) strtab_val = 0; + ElfW(Word) needed_val; + ElfW(Sword) loadaddr = -1; + ElfW(Dyn) *dpnt; + struct stat st; + char *needed; + char *soname = NULL; + int multi_libcs = 0; + + if(expected_type == LIB_DLL) + { + warn("%s does not match type specified for directory!", name); + expected_type = LIB_ANY; + } + + *type = LIB_ELF; + + if (fstat(fileno(infile), &st)) + return NULL; + header = mmap(0, st.st_size, PROT_READ, MAP_SHARED, fileno(infile), 0); + if (header == (caddr_t)-1) + return NULL; + + epnt = (ElfW(Ehdr) *)header; + if ((char *)(epnt+1) > (char *)(header + st.st_size)) + goto skip; + + ppnt = (ElfW(Phdr) *)&header[epnt->e_phoff]; + if ((char *)ppnt < (char *)header || + (char *)(ppnt+epnt->e_phnum) > (char *)(header + st.st_size)) + goto skip; + + for(i = 0; i < epnt->e_phnum; i++) + { + if (loadaddr == -1 && ppnt->p_type == PT_LOAD) + loadaddr = (ppnt->p_vaddr & ~(page_size-1)) - + (ppnt->p_offset & ~(page_size-1)); + if(ppnt->p_type == 2) + { + dynamic_addr = ppnt->p_offset; + dynamic_size = ppnt->p_filesz; + }; + ppnt++; + }; + + dpnt = (ElfW(Dyn) *) &header[dynamic_addr]; + dynamic_size = dynamic_size / sizeof(ElfW(Dyn)); + if ((char *)dpnt < (char *)header || + (char *)(dpnt+dynamic_size) > (char *)(header + st.st_size)) + goto skip; + + while (dpnt->d_tag != DT_NULL) + { + if (dpnt->d_tag == DT_STRTAB) + strtab_val = dpnt->d_un.d_val; + dpnt++; + }; + + if (!strtab_val) + goto skip; + + dpnt = (ElfW(Dyn) *) &header[dynamic_addr]; + while (dpnt->d_tag != DT_NULL) + { + if (dpnt->d_tag == DT_SONAME || dpnt->d_tag == DT_NEEDED) + { + needed_val = dpnt->d_un.d_val; + if (needed_val + strtab_val - loadaddr >= 0 || + needed_val + strtab_val - loadaddr < st.st_size) + { + needed = (char *) (header - loadaddr + strtab_val + needed_val); + + if (dpnt->d_tag == DT_SONAME) + soname = xstrdup(needed); + + for (j = 0; needed_tab[j].soname != NULL; j++) + { + if (strcmp(needed, needed_tab[j].soname) == 0) + { + if (*type != LIB_ELF && *type != needed_tab[j].type) + multi_libcs = 1; + *type = needed_tab[j].type; + } + } + } + } + dpnt++; + }; + + if (multi_libcs) + warn("%s appears to be for multiple libc's", name); + + /* If we could not deduce the libc type, and we know what to expect, set the type */ + if(*type == LIB_ELF && expected_type != LIB_ANY) *type = expected_type; + + if(expected_type != LIB_ANY && expected_type != LIB_ELF && + expected_type != *type) + { + warn("%s does not match type specified for directory!", name); + } + + skip: + munmap(header, st.st_size); + + return soname; +} |