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rpm/rpmio/rpmfileutil.c

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#include "system.h"
#if HAVE_GELF_H
#include <gelf.h>
#if !defined(DT_GNU_PRELINKED)
#define DT_GNU_PRELINKED 0x6ffffdf5
#endif
#if !defined(DT_GNU_LIBLIST)
#define DT_GNU_LIBLIST 0x6ffffef9
#endif
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <errno.h>
#include <popt.h>
#include <ctype.h>
#include <rpm/rpmfileutil.h>
#include <rpm/rpmurl.h>
#include <rpm/rpmmacro.h>
#include <rpm/rpmlog.h>
#include <rpm/argv.h>
#include "rpmio/rpmio_internal.h"
#include "debug.h"
static const char *rpm_config_dir = NULL;
static int is_prelinked(int fdno)
{
int prelinked = 0;
#if HAVE_GELF_H && HAVE_LIBELF
Elf *elf = NULL;
Elf_Scn *scn = NULL;
Elf_Data *data = NULL;
GElf_Ehdr ehdr;
GElf_Shdr shdr;
GElf_Dyn dyn;
(void) elf_version(EV_CURRENT);
if ((elf = elf_begin (fdno, ELF_C_READ, NULL)) == NULL ||
elf_kind(elf) != ELF_K_ELF || gelf_getehdr(elf, &ehdr) == NULL ||
!(ehdr.e_type == ET_DYN || ehdr.e_type == ET_EXEC))
goto exit;
while (!prelinked && (scn = elf_nextscn(elf, scn)) != NULL) {
(void) gelf_getshdr(scn, &shdr);
if (shdr.sh_type != SHT_DYNAMIC)
continue;
while (!prelinked && (data = elf_getdata (scn, data)) != NULL) {
int maxndx = data->d_size / shdr.sh_entsize;
for (int ndx = 0; ndx < maxndx; ++ndx) {
(void) gelf_getdyn (data, ndx, &dyn);
if (!(dyn.d_tag == DT_GNU_PRELINKED || dyn.d_tag == DT_GNU_LIBLIST))
continue;
prelinked = 1;
break;
}
}
}
exit:
if (elf) (void) elf_end(elf);
#endif
return prelinked;
}
static int open_dso(const char * path, pid_t * pidp, rpm_loff_t *fsizep)
{
static const char * cmd = NULL;
static int initted = 0;
int fdno;
if (!initted) {
cmd = rpmExpand("%{?__prelink_undo_cmd}", NULL);
initted++;
}
if (pidp) *pidp = 0;
if (fsizep) {
struct stat sb, * st = &sb;
if (stat(path, st) < 0)
return -1;
*fsizep = st->st_size;
}
fdno = open(path, O_RDONLY);
if (fdno < 0)
return fdno;
if (!(cmd && *cmd))
return fdno;
if (pidp != NULL && is_prelinked(fdno)) {
int pipes[2];
pid_t pid;
int xx;
xx = close(fdno);
pipes[0] = pipes[1] = -1;
xx = pipe(pipes);
if (!(pid = fork())) {
ARGV_t av, lib;
argvSplit(&av, cmd, " ");
xx = close(pipes[0]);
xx = dup2(pipes[1], STDOUT_FILENO);
xx = close(pipes[1]);
if ((lib = argvSearch(av, "library", NULL)) != NULL) {
*lib = (char *) path;
unsetenv("MALLOC_CHECK_");
xx = execve(av[0], av+1, environ);
}
_exit(127);
}
*pidp = pid;
fdno = pipes[0];
xx = close(pipes[1]);
}
return fdno;
}
int rpmDoDigest(int algo, const char * fn,int asAscii,
unsigned char * digest, rpm_loff_t * fsizep)
{
const char * path;
urltype ut = urlPath(fn, &path);
unsigned char * dig = NULL;
size_t diglen;
unsigned char buf[32*BUFSIZ];
FD_t fd;
rpm_loff_t fsize = 0;
pid_t pid = 0;
int rc = 0;
int fdno;
fdno = open_dso(path, &pid, &fsize);
if (fdno < 0) {
rc = 1;
goto exit;
}
switch(ut) {
case URL_IS_PATH:
case URL_IS_UNKNOWN:
case URL_IS_HTTPS:
case URL_IS_HTTP:
case URL_IS_FTP:
case URL_IS_HKP:
case URL_IS_DASH:
default:
/* Either use the pipe to prelink -y or open the URL. */
fd = (pid != 0) ? fdDup(fdno) : Fopen(fn, "r.ufdio");
(void) close(fdno);
if (fd == NULL || Ferror(fd)) {
rc = 1;
if (fd != NULL)
(void) Fclose(fd);
break;
}
fdInitDigest(fd, algo, 0);
fsize = 0;
while ((rc = Fread(buf, sizeof(buf[0]), sizeof(buf), fd)) > 0)
fsize += rc;
fdFiniDigest(fd, algo, (void **)&dig, &diglen, asAscii);
if (dig == NULL || Ferror(fd))
rc = 1;
(void) Fclose(fd);
break;
}
/* Reap the prelink -y helper. */
if (pid) {
int status;
(void) waitpid(pid, &status, 0);
if (!WIFEXITED(status) || WEXITSTATUS(status))
rc = 1;
}
exit:
if (fsizep)
*fsizep = fsize;
if (!rc)
memcpy(digest, dig, diglen);
dig = _free(dig);
return rc;
}
FD_t rpmMkTemp(char *templ)
{
mode_t mode;
int sfd;
FD_t tfd = NULL;
mode = umask(0077);
sfd = mkstemp(templ);
umask(mode);
if (sfd < 0) {
goto exit;
}
tfd = fdDup(sfd);
close(sfd);
exit:
return tfd;
}
FD_t rpmMkTempFile(const char * prefix, char **fn)
{
const char *tpmacro = "%{_tmppath}"; /* always set from rpmrc */
char *tempfn;
static int _initialized = 0;
FD_t tfd = NULL;
if (!prefix) prefix = "";
/* Create the temp directory if it doesn't already exist. */
if (!_initialized) {
_initialized = 1;
tempfn = rpmGenPath(prefix, tpmacro, NULL);
if (rpmioMkpath(tempfn, 0755, (uid_t) -1, (gid_t) -1))
goto exit;
free(tempfn);
}
tempfn = rpmGetPath(prefix, tpmacro, "/rpm-tmp.XXXXXX", NULL);
tfd = rpmMkTemp(tempfn);
if (tfd == NULL || Ferror(tfd)) {
rpmlog(RPMLOG_ERR, _("error creating temporary file %s: %m\n"), tempfn);
goto exit;
}
exit:
if (tfd != NULL && fn)
*fn = tempfn;
else
free(tempfn);
return tfd;
}
int rpmioMkpath(const char * path, mode_t mode, uid_t uid, gid_t gid)
{
char *d, *de;
int rc;
if (path == NULL || *path == '\0')
return -1;
d = rstrcat(NULL, path);
if (d[strlen(d)-1] != '/') {
rstrcat(&d,"/");
}
de = d;
for (;(de=strchr(de+1,'/'));) {
struct stat st;
*de = '\0';
rc = stat(d, &st);
if (rc) {
if (errno != ENOENT)
goto exit;
rc = mkdir(d, mode);
if (rc)
goto exit;
rpmlog(RPMLOG_DEBUG, "created directory(s) %s mode 0%o\n", path, mode);
if (!(uid == (uid_t) -1 && gid == (gid_t) -1)) {
rc = chown(d, uid, gid);
if (rc)
goto exit;
}
} else if (!S_ISDIR(st.st_mode)) {
rc = ENOTDIR;
goto exit;
}
*de = '/';
}
rc = 0;
exit:
free(d);
return rc;
}
int rpmFileIsCompressed(const char * file, rpmCompressedMagic * compressed)
{
FD_t fd;
ssize_t nb;
int rc = -1;
unsigned char magic[13];
*compressed = COMPRESSED_NOT;
fd = Fopen(file, "r.ufdio");
if (fd == NULL || Ferror(fd)) {
/* XXX Fstrerror */
rpmlog(RPMLOG_ERR, _("File %s: %s\n"), file, Fstrerror(fd));
if (fd) (void) Fclose(fd);
return 1;
}
nb = Fread(magic, sizeof(magic[0]), sizeof(magic), fd);
if (nb < 0) {
rpmlog(RPMLOG_ERR, _("File %s: %s\n"), file, Fstrerror(fd));
rc = 1;
} else if (nb < sizeof(magic)) {
rpmlog(RPMLOG_ERR, _("File %s is smaller than %u bytes\n"),
file, (unsigned)sizeof(magic));
rc = 0;
}
(void) Fclose(fd);
if (rc >= 0)
return rc;
rc = 0;
if ((magic[0] == 'B') && (magic[1] == 'Z')) {
*compressed = COMPRESSED_BZIP2;
} else if ((magic[0] == 'P') && (magic[1] == 'K') &&
(((magic[2] == 3) && (magic[3] == 4)) ||
((magic[2] == '0') && (magic[3] == '0')))) { /* pkzip */
*compressed = COMPRESSED_ZIP;
} else if ((magic[0] == 0xfd) && (magic[1] == 0x37) &&
(magic[2] == 0x7a) && (magic[3] == 0x58) &&
(magic[4] == 0x5a) && (magic[5] == 0x00)) {
/* new style xz (lzma) with magic */
*compressed = COMPRESSED_XZ;
} else if ((magic[0] == 'L') && (magic[1] == 'Z') &&
(magic[2] == 'I') && (magic[3] == 'P')) {
*compressed = COMPRESSED_LZIP;
} else if ((magic[0] == 'L') && (magic[1] == 'R') &&
(magic[2] == 'Z') && (magic[3] == 'I')) {
*compressed = COMPRESSED_LRZIP;
} else if (((magic[0] == 0037) && (magic[1] == 0213)) || /* gzip */
((magic[0] == 0037) && (magic[1] == 0236)) || /* old gzip */
((magic[0] == 0037) && (magic[1] == 0036)) || /* pack */
((magic[0] == 0037) && (magic[1] == 0240)) || /* SCO lzh */
((magic[0] == 0037) && (magic[1] == 0235)) /* compress */
) {
*compressed = COMPRESSED_OTHER;
} else if ((magic[0] == '7') && (magic[1] == 'z') &&
(magic[2] == 0xbc) && (magic[3] == 0xaf) &&
(magic[4] == 0x27) && (magic[5] == 0x1c)) {
*compressed = COMPRESSED_7ZIP;
} else if (rpmFileHasSuffix(file, ".lzma")) {
*compressed = COMPRESSED_LZMA;
}
return rc;
}
/* @todo "../sbin/./../bin/" not correct. */
char *rpmCleanPath(char * path)
{
const char *s;
char *se, *t, *te;
int begin = 1;
if (path == NULL)
return NULL;
/*fprintf(stderr, "*** RCP %s ->\n", path); */
s = t = te = path;
while (*s != '\0') {
/*fprintf(stderr, "*** got \"%.*s\"\trest \"%s\"\n", (t-path), path, s); */
switch(*s) {
case ':': /* handle url's */
if (s[1] == '/' && s[2] == '/') {
*t++ = *s++;
*t++ = *s++;
break;
}
begin=1;
break;
case '/':
/* Move parent dir forward */
for (se = te + 1; se < t && *se != '/'; se++)
{};
if (se < t && *se == '/') {
te = se;
/*fprintf(stderr, "*** next pdir \"%.*s\"\n", (te-path), path); */
}
while (s[1] == '/')
s++;
while (t > path && t[-1] == '/')
t--;
break;
case '.':
/* Leading .. is special */
/* Check that it is ../, so that we don't interpret */
/* ..?(i.e. "...") or ..* (i.e. "..bogus") as "..". */
/* in the case of "...", this ends up being processed*/
/* as "../.", and the last '.' is stripped. This */
/* would not be correct processing. */
if (begin && s[1] == '.' && (s[2] == '/' || s[2] == '\0')) {
/*fprintf(stderr, " leading \"..\"\n"); */
*t++ = *s++;
break;
}
/* Single . is special */
if (begin && s[1] == '\0') {
break;
}
/* Handle the ./ cases */
if (t > path && t[-1] == '/') {
/* Trim embedded ./ */
if (s[1] == '/') {
s+=2;
continue;
}
/* Trim trailing /. */
if (s[1] == '\0') {
s++;
continue;
}
}
/* Trim embedded /../ and trailing /.. */
if (!begin && t > path && t[-1] == '/' && s[1] == '.' && (s[2] == '/' || s[2] == '\0')) {
t = te;
/* Move parent dir forward */
if (te > path)
for (--te; te > path && *te != '/'; te--)
{};
/*fprintf(stderr, "*** prev pdir \"%.*s\"\n", (te-path), path); */
s++;
s++;
continue;
}
break;
default:
begin = 0;
break;
}
*t++ = *s++;
}
/* Trim trailing / (but leave single / alone) */
if (t > &path[1] && t[-1] == '/')
t--;
*t = '\0';
/*fprintf(stderr, "\t%s\n", path); */
return path;
}
/* Merge 3 args into path, any or all of which may be a url. */
char * rpmGenPath(const char * urlroot, const char * urlmdir,
const char *urlfile)
{
char * xroot = rpmGetPath(urlroot, NULL);
const char * root = xroot;
char * xmdir = rpmGetPath(urlmdir, NULL);
const char * mdir = xmdir;
char * xfile = rpmGetPath(urlfile, NULL);
const char * file = xfile;
char * result;
char * url = NULL;
int nurl = 0;
int ut;
ut = urlPath(xroot, &root);
if (url == NULL && ut > URL_IS_DASH) {
url = xroot;
nurl = root - xroot;
}
if (root == NULL || *root == '\0') root = "/";
ut = urlPath(xmdir, &mdir);
if (url == NULL && ut > URL_IS_DASH) {
url = xmdir;
nurl = mdir - xmdir;
}
if (mdir == NULL || *mdir == '\0') mdir = "/";
ut = urlPath(xfile, &file);
if (url == NULL && ut > URL_IS_DASH) {
url = xfile;
nurl = file - xfile;
}
if (url && nurl > 0) {
char *t = rstrcat(NULL, url);
t[nurl] = '\0';
url = t;
} else
url = xstrdup("");
result = rpmGetPath(url, root, "/", mdir, "/", file, NULL);
free(xroot);
free(xmdir);
free(xfile);
free(url);
return result;
}
/* Return concatenated and expanded canonical path. */
char * rpmGetPath(const char *path, ...)
{
va_list ap;
char *dest = NULL, *res;
const char *s;
if (path == NULL)
return xstrdup("");
va_start(ap, path);
for (s = path; s; s = va_arg(ap, const char *)) {
rstrcat(&dest, s);
}
va_end(ap);
res = rpmExpand(dest, NULL);
free(dest);
return rpmCleanPath(res);
}
char * rpmEscapeSpaces(const char * s)
{
const char * se;
char * t;
char * te;
size_t nb = 0;
for (se = s; *se; se++) {
if (isspace(*se))
nb++;
nb++;
}
nb++;
t = te = xmalloc(nb);
for (se = s; *se; se++) {
if (isspace(*se))
*te++ = '\\';
*te++ = *se;
}
*te = '\0';
return t;
}
int rpmFileHasSuffix(const char *path, const char *suffix)
{
size_t plen = strlen(path);
size_t slen = strlen(suffix);
return (plen >= slen && rstreq(path+plen-slen, suffix));
}
char * rpmGetCwd(void)
{
int currDirLen = 0;
char * currDir = NULL;
do {
currDirLen += 128;
currDir = xrealloc(currDir, currDirLen);
memset(currDir, 0, currDirLen);
} while (getcwd(currDir, currDirLen) == NULL && errno == ERANGE);
return currDir;
}
int rpmMkdirs(const char *root, const char *pathstr)
{
ARGV_t dirs = NULL;
int rc = 0;
argvSplit(&dirs, pathstr, ":");
for (char **d = dirs; *d; d++) {
char *path = rpmGetPath(root ? root : "", *d, NULL);
if ((rc = rpmioMkpath(path, 0755, -1, -1)) != 0) {
const char *msg = _("failed to create directory");
/* try to be more informative if the failing part was a macro */
if (**d == '%') {
rpmlog(RPMLOG_ERR, "%s %s: %s: %m\n", msg, *d, path);
} else {
rpmlog(RPMLOG_ERR, "%s %s: %m\n", msg, path);
}
}
free(path);
if (rc) break;
}
argvFree(dirs);
return rc;
}
const char *rpmConfigDir(void)
{
if (rpm_config_dir == NULL) {
char *rpmenv = getenv("RPM_CONFIGDIR");
rpm_config_dir = rpmenv ? xstrdup(rpmenv) : RPMCONFIGDIR;
}
return rpm_config_dir;
}
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