hack up libproxychains.so to contain some glibc symbols

this is needed to run a musl-linked proxychains against some
glibc binaries (after they have their interpreter overwritten
with patchelf to point to musl's dynlinker.)

Makefile

@@ -15,7 +15,7 @@ sysconfdir=$(prefix)/etc
 
 SRCS = $(sort $(wildcard src/*.c))
 OBJS = $(SRCS:.c=.o)
-LOBJS = src/nameinfo.o \
+LOBJS = src/nameinfo.o src/legacy.o \
         src/core.o src/common.o src/libproxychains.o src/shm.o \
         src/allocator_thread.o src/ip_type.o src/stringdump.o \
         src/hostentdb.o src/hash.o src/debug.o

src/legacy.c

@@ -0,0 +1,481 @@
+int __res_ninit() {
+	return 0;
+}
+
+void __pthread_register_cancel(void* p) {
+
+}
+
+void __pthread_unregister_cancel(void *p) {
+
+}
+
+#include <setjmp.h>
+int __sigsetjmp(sigjmp_buf buf, int save) {
+	return sigsetjmp(buf, save);
+}
+
+static __thread void* thread_arg;
+static __thread int (*thread_compar)(const void*, const void*, void*);
+static int my_thread_compare_func(const void* a, const void* b) {
+	return thread_compar(a, b, thread_arg);
+}
+#include <stddef.h>
+#include <stdlib.h>
+void qsort_r(void* base, size_t nmemb, size_t size, int (*compar)(const void*, const void*, void*), void *arg) {
+	thread_arg = arg;
+	thread_compar = compar;
+	return qsort(base, nmemb, size, my_thread_compare_func);
+}
+
+int backtrace(void **buffer, int size) {
+	return 0;
+}
+
+char **backtrace_symbols(void *const *buffer, int size) {
+	return 0;
+}
+
+#include <pthread.h>
+int __register_atfork(void (*prepare) (void), void (*parent) (void), void (*child) (void), void * __dso_handle) {
+	return pthread_atfork(prepare, parent, child);
+}
+
+#define _GNU_SOURCE
+#include <poll.h>
+#include <setjmp.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <syslog.h>
+#include <unistd.h>
+#include <wchar.h>
+
+__attribute((noreturn)) void __chk_fail(void)
+{
+	write(2, "buffer overflow detected\n", 25);
+	abort();
+}
+
+int __asprintf_chk(char **s, int flag, const char *fmt, ...)
+{
+	va_list ap;
+	int r;
+	va_start(ap,fmt);
+	r = vasprintf(s, fmt, ap);
+	va_end(ap);
+	return r;
+}
+
+size_t __confstr_chk(int name, char *buf, size_t len, size_t size)
+{
+	return confstr(name, buf, len);
+}
+
+int __dprintf_chk(int fd, int flag, const char *fmt, ...)
+{
+	va_list ap;
+	int r;
+	va_start(ap,fmt);
+	r = vdprintf(fd, fmt, ap);
+	va_end(ap);
+	return r;
+}
+
+char *__fgets_chk(char *s, size_t size, int n, FILE *f)
+{
+	return fgets(s, n, f);
+}
+
+char *__fgets_unlocked_chk(char *s, size_t size, int n, FILE *f)
+{
+	return fgets_unlocked(s, n, f);
+}
+
+wchar_t *__fgetws_chk(wchar_t *s, size_t size, int n, FILE *f)
+{
+	return fgetws(s, n, f);
+}
+
+wchar_t *fgetws_unlocked(wchar_t *, int, FILE *);
+
+wchar_t *__fgetws_unlocked_chk(wchar_t *s, size_t size, int n, FILE *f)
+{
+	return fgetws_unlocked(s, n, f);
+}
+
+int __fprintf_chk(FILE *f, int flag, const char *fmt, ...)
+{
+	va_list ap;
+	int r;
+	va_start(ap,fmt);
+	r = vfprintf(f, fmt, ap);
+	va_end(ap);
+	return r;
+}
+
+int __fwprintf_chk(FILE *f, int flag, const wchar_t *fmt, ...)
+{
+	va_list ap;
+	int r;
+	va_start(ap,fmt);
+	r = vfwprintf(f, fmt, ap);
+	va_end(ap);
+	return r;
+}
+
+size_t __fread_chk(void *p, size_t size, size_t sz, size_t n, FILE *f)
+{
+	return fread(p, sz, n, f);
+}
+
+size_t __fread_unlocked_chk(void *p, size_t size, size_t sz, size_t n, FILE *f)
+{
+	return fread_unlocked(p, sz, n, f);
+}
+
+char *__getcwd_chk(char *buf, size_t len, size_t size)
+{
+	return getcwd(buf, len);
+}
+
+int __getdomainname_chk(char *buf, size_t len, size_t size)
+{
+	return getdomainname(buf, len);
+}
+
+int __getgroups_chk(int n, gid_t *list, size_t listlen)
+{
+	return getgroups(n, list);
+}
+
+int __gethostname_chk(char *buf, size_t len, size_t size)
+{
+	return gethostname(buf, len);
+}
+
+int __getlogin_r_chk(char *buf, size_t len, size_t size)
+{
+	return getlogin_r(buf, len);
+}
+
+char *__gets_chk(char *buf, size_t size)
+{
+	return gets(buf);
+}
+
+__attribute((noreturn)) void __longjmp_chk(jmp_buf buf, int v)
+{
+	longjmp(buf, v);
+}
+
+size_t __mbsnrtowcs_chk(wchar_t *dst, const char **src, size_t n, size_t len, mbstate_t *st, size_t dstsize)
+{
+	return mbsnrtowcs(dst, src, n, len, st);
+}
+
+size_t __mbsrtowcs_chk(wchar_t *dst, const char **src, size_t len, mbstate_t *st, size_t dstsize)
+{
+	return mbsrtowcs(dst, src, len, st);
+}
+
+size_t __mbstowcs_chk(wchar_t *dst, const char *src, size_t len, size_t dstsize)
+{
+	return mbstowcs(dst, src, len);
+}
+
+void *__memcpy_chk(void *dst, void *src, size_t len, size_t dstsize)
+{
+	return memcpy(dst, src, len);
+}
+
+void *__mempcpy_chk(void *dst, void *src, size_t len, size_t dstsize)
+{
+	return mempcpy(dst, src, len);
+}
+
+void *__memmove_chk(void *dst, void *src, size_t len, size_t dstsize)
+{
+	return memmove(dst, src, len);
+}
+
+void *__memset_chk(void *s, int c, size_t n, size_t size)
+{
+	return memset(s, c, n);
+}
+
+int __poll_chk(struct pollfd *fds, nfds_t n, int timeout, size_t fdslen)
+{
+	return poll(fds, n, timeout);
+}
+
+int __ppoll_chk(struct pollfd *fds, nfds_t n, const struct timespec *timeout, const sigset_t *mask, size_t fdslen)
+{
+	return ppoll(fds, n, timeout, mask);
+}
+
+ssize_t __pread_chk(int fd, void *buf, size_t n, off_t off, size_t bufsize)
+{
+	return pread(fd, buf, n, off);
+}
+
+#undef weak_alias
+#define weak_alias(old, new) \
+        extern __typeof(old) new __attribute__((weak, alias(#old)))
+
+weak_alias(__pread_chk, __pread64_chk);
+
+int __printf_chk(int flag, const char *fmt, ...)
+{
+	va_list ap;
+	int r;
+	va_start(ap,fmt);
+	r = vprintf(fmt, ap);
+	va_end(ap);
+	return r;
+}
+
+int __ptsname_r_chk(int fd, char *buf, size_t len, size_t size)
+{
+	return ptsname_r(fd, buf, len);
+}
+
+ssize_t __read_chk(int fd, void *buf, size_t n, size_t bufsize)
+{
+	return read(fd, buf, n);
+}
+
+ssize_t __readlinkat_chk(int fd, const char *path, void *buf, size_t n, size_t bufsize)
+{
+	return readlinkat(fd, path, buf, n);
+}
+
+ssize_t __readlink_chk(const char *path, void *buf, size_t n, size_t bufsize)
+{
+	return readlink(path, buf, n);
+}
+
+char *__realpath_chk(const char *name, char *resolved, size_t resolvedsize)
+{
+	return realpath(name, resolved);
+}
+
+ssize_t __recv_chk(int fd, void *buf, size_t n, size_t bufsize, int flags)
+{
+	return recv(fd, buf, n, flags);
+}
+
+ssize_t __recvfrom_chk(int fd, void *buf, size_t n, size_t bufsize, int flags, struct sockaddr *addr, socklen_t *addrlen)
+{
+	return recvfrom(fd, buf, n, flags, addr, addrlen);
+}
+
+int __sprintf_chk(char *s, int flag, size_t size, const char *fmt, ...)
+{
+	va_list ap;
+	int r;
+	va_start(ap,fmt);
+	r = vsprintf(s, fmt, ap);
+	va_end(ap);
+	return r;
+}
+
+int __snprintf_chk(char *s, size_t n, int flag, size_t size, const char *fmt, ...)
+{
+	va_list ap;
+	int r;
+	va_start(ap,fmt);
+	r = vsnprintf(s, n, fmt, ap);
+	va_end(ap);
+	return r;
+}
+
+char *__stpcpy_chk(char *dst, const char *src, size_t dstsize)
+{
+	return stpcpy(dst, src);
+}
+char *__stpncpy_chk(char *dst, const char *src, size_t n, size_t dstsize)
+{
+	return stpncpy(dst, src, n);
+}
+
+char *__strcat_chk(char *dst, const char *src, size_t dstsize)
+{
+	return strcat(dst, src);
+}
+
+char *__strcpy_chk(char *dst, const char *src, size_t dstsize)
+{
+	return strcpy(dst, src);
+}
+
+char *__strncat_chk(char *dst, const char *src, size_t n, size_t dstsize)
+{
+	return strncat(dst, src, n);
+}
+
+char *__strncpy_chk(char *dst, const char *src, size_t n, size_t dstsize)
+{
+	return strncpy(dst, src, n);
+}
+
+int __swprintf_chk(wchar_t *s, size_t n, int flag, size_t size, const wchar_t *fmt, ...)
+{
+	va_list ap;
+	int r;
+	va_start(ap,fmt);
+	r = vswprintf(s, n, fmt, ap);
+	va_end(ap);
+	return r;
+}
+
+void __syslog_chk(int pri, int flag, const char *fmt, ...)
+{
+	va_list ap;
+	va_start(ap, fmt);
+	vsyslog(pri, fmt, ap);
+	va_end(ap);
+}
+
+int __ttyname_r_chk(int fd, char *buf, size_t len, size_t size)
+{
+	return ttyname_r(fd, buf, len);
+}
+
+int __vasprintf_chk(char **s, int flag, const char *fmt, va_list ap)
+{
+	return vasprintf(s, fmt, ap);
+}
+
+int __vdprintf_chk(int fd, int flag, const char *fmt, va_list ap)
+{
+	return vdprintf(fd, fmt, ap);
+}
+
+int __vfprintf_chk(FILE *f, int flag, const char *fmt, va_list ap)
+{
+	return vfprintf(f, fmt, ap);
+}
+
+int __vfwprintf_chk(FILE *f, int flag, const wchar_t *fmt, va_list ap)
+{
+	return vfwprintf(f, fmt, ap);
+}
+
+int __vprintf_chk(int flag, const char *fmt, va_list ap)
+{
+	return vprintf(fmt, ap);
+}
+
+int __vsnprintf_chk(char *s, size_t n, int flag, size_t size, const char *fmt, va_list ap)
+{
+	return vsnprintf(s, n, fmt, ap);
+}
+
+int __vsprintf_chk(char *s, int flag, size_t size, const char *fmt, va_list ap)
+{
+	return vsprintf(s, fmt, ap);
+}
+
+int __vswprintf_chk(wchar_t *s, size_t n, int flag, size_t size, const wchar_t *fmt, va_list ap)
+{
+	return vswprintf(s, n, fmt, ap);
+}
+
+void __vsyslog_chk(int pri, int flag, const char *fmt, va_list ap)
+{
+	vsyslog(pri, fmt, ap);
+}
+
+int __vwprintf_chk(int flag, const wchar_t *fmt, va_list ap)
+{
+	return vwprintf(fmt, ap);
+}
+
+wchar_t *__wcpcpy_chk(wchar_t *dst, const wchar_t *src, size_t dstsize)
+{
+	return wcpcpy(dst, src);
+}
+
+wchar_t *__wcpncpy_chk(wchar_t *dst, const wchar_t *src, size_t n, size_t dstsize)
+{
+	return wcpncpy(dst, src, n);
+}
+
+size_t __wcrtomb_chk(char *s, wchar_t c, mbstate_t *st, size_t size)
+{
+	return wcrtomb(s, c, st);
+}
+
+wchar_t *__wcscat_chk(wchar_t *dst, const wchar_t *src, size_t dstlen)
+{
+	return wcscat(dst, src);
+}
+
+wchar_t *__wcscpy_chk(wchar_t *dst, const wchar_t *src, size_t dstlen)
+{
+	return wcscpy(dst, src);
+}
+
+wchar_t *__wcsncat_chk(wchar_t *dst, const wchar_t *src, size_t n, size_t dstlen)
+{
+	return wcsncat(dst, src, n);
+}
+
+wchar_t *__wcsncpy_chk(wchar_t *dst, const wchar_t *src, size_t n, size_t dstlen)
+{
+	return wcsncpy(dst, src, n);
+}
+
+size_t __wcsnrtombs_chk(char *dst, const wchar_t **src, size_t n, size_t len, mbstate_t *st, size_t dstsize)
+{
+	return wcsnrtombs(dst, src, n, len, st);
+}
+
+size_t __wcsrtombs_chk(char *dst, const wchar_t **src, size_t len, mbstate_t *st, size_t dstsize)
+{
+	return wcsrtombs(dst, src, len, st);
+}
+
+size_t __wcstombs_chk(char *dst, const wchar_t *src, size_t len, size_t dstsize)
+{
+	return wcstombs(dst, src, len);
+}
+
+int __wctomb_chk(char *s, wchar_t c, size_t size)
+{
+	return wctomb(s, c);
+}
+
+wchar_t *__wmemcpy_chk(wchar_t *dst, const wchar_t *src, size_t n, size_t dstlen)
+{
+	return wmemcpy(dst, src, n);
+}
+
+wchar_t *__wmemmove_chk(wchar_t *dst, const wchar_t *src, size_t n, size_t dstlen)
+{
+	return wmemmove(dst, src, n);
+}
+
+wchar_t *__wmempcpy_chk(wchar_t *dst, const wchar_t *src, size_t n, size_t dstlen)
+{
+	return mempcpy(dst, src, n*sizeof*src);
+}
+
+wchar_t *__wmemset_chk(wchar_t *s, wchar_t c, size_t n, size_t slen)
+{
+	return wmemset(s, c, n);
+}
+
+int __wprintf_chk(int flag, const wchar_t *fmt, ...)
+{
+	va_list ap;
+	int r;
+	va_start(ap,fmt);
+	r = vwprintf(fmt, ap);
+	va_end(ap);
+	return r;
+}
+