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/*******************************************************************/
/* slibtool: a skinny libtool implementation, written in C */
/* Copyright (C) 2016--2018 Z. Gilboa */
/* Released under the Standard MIT License; see COPYING.SLIBTOOL. */
/*******************************************************************/
#include <fcntl.h>
#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include "slibtool_lconf_impl.h"
#include "slibtool_driver_impl.h"
#include "slibtool_errinfo_impl.h"
#include "slibtool_symlink_impl.h"
#include "slibtool_readlink_impl.h"
enum slbt_lconf_opt {
SLBT_LCONF_OPT_UNKNOWN,
SLBT_LCONF_OPT_NO,
SLBT_LCONF_OPT_YES,
};
static void slbt_lconf_close(int fdcwd, int fdlconfdir)
{
if (fdlconfdir != fdcwd)
close(fdlconfdir);
}
static int slbt_lconf_open(
struct slbt_driver_ctx * dctx,
const char * lconf)
{
int fdcwd;
int fdlconf;
int fdlconfdir;
int fdparent;
struct stat stcwd;
struct stat stparent;
fdcwd = slbt_driver_fdcwd(dctx);
fdlconfdir = fdcwd;
if (lconf)
return ((fdlconf = openat(fdcwd,lconf,O_RDONLY,0)) < 0)
? SLBT_CUSTOM_ERROR(dctx,SLBT_ERR_LCONF_OPEN)
: fdlconf;
if (fstatat(fdlconfdir,".",&stcwd,0) < 0)
return SLBT_SYSTEM_ERROR(dctx);
fdlconf = openat(fdlconfdir,"libtool",O_RDONLY,0);
while (fdlconf < 0) {
fdparent = openat(fdlconfdir,"../",O_DIRECTORY,0);
slbt_lconf_close(fdcwd,fdlconfdir);
if (fdparent < 0)
return SLBT_SYSTEM_ERROR(dctx);
if (fstat(fdparent,&stparent) < 0)
return SLBT_SYSTEM_ERROR(dctx);
if (stparent.st_dev != stcwd.st_dev)
return SLBT_CUSTOM_ERROR(
dctx,SLBT_ERR_LCONF_OPEN);
fdlconfdir = fdparent;
fdlconf = openat(fdlconfdir,"libtool",O_RDONLY,0);
}
return fdlconf;
}
int slbt_get_lconf_flags(
struct slbt_driver_ctx * dctx,
const char * lconf,
uint64_t * flags)
{
int fdlconf;
struct stat st;
void * addr;
const char * mark;
const char * cap;
uint64_t optshared;
uint64_t optstatic;
int optlenmax;
int optsharedlen;
int optstaticlen;
const char * optsharedstr;
const char * optstaticstr;
/* open relative libtool script */
if ((fdlconf = slbt_lconf_open(dctx,lconf)) < 0)
return SLBT_NESTED_ERROR(dctx);
if (fdlconf < 0)
return SLBT_CUSTOM_ERROR(
dctx,SLBT_ERR_LCONF_OPEN);
/* map relative libtool script */
if (fstat(fdlconf,&st) < 0)
return SLBT_SYSTEM_ERROR(dctx);
addr = mmap(
0,st.st_size,
PROT_READ,MAP_SHARED,
fdlconf,0);
close(fdlconf);
if (addr == MAP_FAILED)
return SLBT_CUSTOM_ERROR(
dctx,SLBT_ERR_LCONF_MAP);
mark = addr;
cap = &mark[st.st_size];
/* hard-coded options in the generated libtool precede the code */
if (st.st_size >= (optlenmax = strlen("build_libtool_libs=yes\n")))
cap -= optlenmax;
/* scan */
optshared = 0;
optstatic = 0;
optsharedstr = "build_libtool_libs=";
optstaticstr = "build_old_libs=";
optsharedlen = strlen(optsharedstr);
optstaticlen = strlen(optstaticstr);
for (; mark && mark<cap; ) {
if (!strncmp(mark,optsharedstr,optsharedlen)) {
mark += optsharedlen;
if ((mark[0]=='n')
&& (mark[1]=='o')
&& (mark[2]=='\n'))
optshared = SLBT_DRIVER_DISABLE_SHARED;
if ((mark[0]=='y')
&& (mark[1]=='e')
&& (mark[2]=='s')
&& (mark[3]=='\n'))
optshared = SLBT_DRIVER_SHARED;
} if (!strncmp(mark,optstaticstr,optstaticlen)) {
mark += optstaticlen;
if ((mark[0]=='n')
&& (mark[1]=='o')
&& (mark[2]=='\n'))
optstatic = SLBT_DRIVER_DISABLE_STATIC;
if ((mark[0]=='y')
&& (mark[1]=='e')
&& (mark[2]=='s')
&& (mark[3]=='\n'))
optstatic = SLBT_DRIVER_STATIC;
}
if (optshared && optstatic)
mark = 0;
else {
for (; (mark<cap) && (*mark!='\n'); )
mark++;
mark++;
}
}
munmap(addr,st.st_size);
if (!optshared || !optstatic)
return SLBT_CUSTOM_ERROR(
dctx,SLBT_ERR_LCONF_PARSE);
*flags = optshared | optstatic;
return 0;
}
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