mirror of
https://github.com/jart/cosmopolitan.git
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14e192e5ba
This is similar to the --ftrace (c function call trace) flag, except
it's less noisy since it only logs system calls to stderr. Having this
flag is valuable because (1) system call tracing tells us a lot about
the behavior of complex programs and (2) it's usually very hard to get
system call tracing on various operating systems, e.g. strace, ktrace,
dtruss, truss, nttrace, etc. Especially on Apple platforms where even
with the special boot trick, debuggers still aren't guaranteed to work.
make -j8 o//examples
o//examples/hello.com --strace
This is enabled by default in MODE=, MODE=opt, and MODE=dbg. In MODE=dbg
extra information will be printed.
make -j8 MODE=dbg o/dbg/examples
o/dbg/examples/hello.com --strace |& less
This change also changes:
- Rename IsText() → _istext()
- Rename IsUtf8() → _isutf8()
- Fix madvise() on Windows NT
- Fix empty string case of inet_ntop()
- vfork() wrapper now saves and restores errno
- Update xsigaction() to yoink syscall support
223 lines
9.3 KiB
C
223 lines
9.3 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2021 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/bits/bits.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/struct/timespec.h"
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#include "libc/dos.h"
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#include "libc/elf/def.h"
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#include "libc/fmt/conv.h"
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#include "libc/limits.h"
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#include "libc/log/check.h"
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#include "libc/nexgen32e/crc32.h"
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#include "libc/nt/enum/fileflagandattributes.h"
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#include "libc/rand/rand.h"
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#include "libc/runtime/gc.internal.h"
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#include "libc/time/struct/tm.h"
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#include "libc/time/time.h"
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#include "libc/x/x.h"
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#include "libc/zip.h"
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#include "third_party/zlib/zlib.h"
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#include "tool/build/lib/elfwriter.h"
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#include "tool/build/lib/isnocompressext.h"
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#define ZIP_LOCALFILE_SECTION ".zip.2."
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#define ZIP_DIRECTORY_SECTION ".zip.4."
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static bool ShouldCompress(const char *name, size_t namesize,
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const unsigned char *data, size_t datasize,
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bool nocompress) {
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return !nocompress && datasize >= 64 && !IsNoCompressExt(name, namesize) &&
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(datasize < 1000 || MeasureEntropy((void *)data, 1000) < 7);
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}
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static void GetDosLocalTime(int64_t utcunixts, uint16_t *out_time,
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uint16_t *out_date) {
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struct tm tm;
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CHECK_NOTNULL(localtime_r(&utcunixts, &tm));
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*out_time = DOS_TIME(tm.tm_hour, tm.tm_min, tm.tm_sec);
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*out_date = DOS_DATE(tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday + 1);
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}
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static int DetermineVersionNeededToExtract(int method) {
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if (method == kZipCompressionDeflate) {
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return kZipEra1993;
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} else {
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return kZipEra1989;
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}
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}
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static unsigned char *EmitZipLfileHdr(unsigned char *p, const void *name,
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size_t namesize, uint32_t crc,
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uint8_t era, uint16_t gflags,
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uint16_t method, uint16_t mtime,
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uint16_t mdate, size_t compsize,
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size_t uncompsize) {
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p = WRITE32LE(p, kZipLfileHdrMagic);
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*p++ = era;
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*p++ = kZipOsDos;
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p = WRITE16LE(p, gflags);
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p = WRITE16LE(p, method);
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p = WRITE16LE(p, mtime);
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p = WRITE16LE(p, mdate);
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p = WRITE32LE(p, crc);
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p = WRITE32LE(p, compsize);
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p = WRITE32LE(p, uncompsize);
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p = WRITE16LE(p, namesize);
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p = WRITE16LE(p, 0); /* extra */
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return mempcpy(p, name, namesize);
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}
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static void EmitZipCdirHdr(unsigned char *p, const void *name, size_t namesize,
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uint32_t crc, uint8_t era, uint16_t gflags,
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uint16_t method, uint16_t mtime, uint16_t mdate,
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uint16_t iattrs, uint16_t dosmode, uint16_t unixmode,
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size_t compsize, size_t uncompsize,
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size_t commentsize, struct timespec mtim,
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struct timespec atim, struct timespec ctim) {
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uint64_t mt, at, ct;
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p = WRITE32LE(p, kZipCfileHdrMagic);
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*p++ = kZipCosmopolitanVersion;
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*p++ = kZipOsUnix;
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*p++ = era;
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*p++ = kZipOsDos;
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p = WRITE16LE(p, gflags);
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p = WRITE16LE(p, method);
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p = WRITE16LE(p, mtime);
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p = WRITE16LE(p, mdate);
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/* 16 */
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p = WRITE32LE(p, crc);
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p = WRITE32LE(p, compsize);
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p = WRITE32LE(p, uncompsize);
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p = WRITE16LE(p, namesize);
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#define CFILE_HDR_SIZE (kZipCfileHdrMinSize + 36)
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p = WRITE16LE(p, 36); /* extra size */
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/* 32 */
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p = WRITE16LE(p, commentsize);
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p = WRITE16LE(p, 0); /* disk */
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p = WRITE16LE(p, iattrs);
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p = WRITE16LE(p, dosmode);
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p = WRITE16LE(p, unixmode);
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p = WRITE32LE(p, 0); /* RELOCATE ME (kZipCfileOffsetOffset) */
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/* 46 */
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memcpy(p, name, namesize);
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p += namesize;
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p = WRITE16LE(p, kZipExtraNtfs);
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p = WRITE16LE(p, 32);
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p = WRITE32LE(p, 0);
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p = WRITE16LE(p, 1);
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p = WRITE16LE(p, 24);
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mt = TimeSpecToWindowsTime(mtim);
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at = TimeSpecToWindowsTime(atim);
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ct = TimeSpecToWindowsTime(ctim);
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p = WRITE64LE(p, mt);
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p = WRITE64LE(p, at);
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p = WRITE64LE(p, ct);
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}
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/**
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* Embeds zip file in elf object.
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*/
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void elfwriter_zip(struct ElfWriter *elf, const char *symbol, const char *name,
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size_t namesize, const void *data, size_t size,
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uint32_t mode, struct timespec mtim, struct timespec atim,
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struct timespec ctim, bool nocompress, uint64_t imagebase) {
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z_stream zs;
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uint8_t era;
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uint32_t crc;
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unsigned char *lfile, *cfile;
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struct ElfWriterSymRef lfilesym;
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size_t lfilehdrsize, uncompsize, compsize, commentsize;
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uint16_t method, gflags, mtime, mdate, iattrs, dosmode;
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CHECK_NE(0, mtim.tv_sec);
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gflags = 0;
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iattrs = 0;
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compsize = size;
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uncompsize = size;
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CHECK_LE(uncompsize, UINT32_MAX);
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lfilehdrsize = kZipLfileHdrMinSize + namesize;
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crc = crc32_z(0, data, uncompsize);
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GetDosLocalTime(mtim.tv_sec, &mtime, &mdate);
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if (_isutf8(name, namesize)) gflags |= kZipGflagUtf8;
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if (S_ISREG(mode) && _istext(data, size)) {
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iattrs |= kZipIattrText;
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}
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commentsize = kZipCdirHdrLinkableSize - (CFILE_HDR_SIZE + namesize);
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dosmode = !(mode & 0200) ? kNtFileAttributeReadonly : 0;
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method = ShouldCompress(name, namesize, data, size, nocompress)
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? kZipCompressionDeflate
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: kZipCompressionNone;
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/* emit embedded file content w/ pkzip local file header */
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elfwriter_align(elf, 1, 0);
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elfwriter_startsection(elf,
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gc(xasprintf("%s%s", ZIP_LOCALFILE_SECTION, name)),
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SHT_PROGBITS, SHF_ALLOC);
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if (method == kZipCompressionDeflate) {
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CHECK_EQ(Z_OK, deflateInit2(memset(&zs, 0, sizeof(zs)),
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Z_DEFAULT_COMPRESSION, Z_DEFLATED, -MAX_WBITS,
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MAX_MEM_LEVEL, Z_DEFAULT_STRATEGY));
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zs.next_in = data;
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zs.avail_in = uncompsize;
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zs.next_out = ((lfile = elfwriter_reserve(
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elf, (lfilehdrsize +
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(zs.avail_out = compressBound(uncompsize))))) +
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lfilehdrsize);
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CHECK_EQ(Z_STREAM_END, deflate(&zs, Z_FINISH));
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CHECK_EQ(Z_OK, deflateEnd(&zs));
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if (zs.total_out < uncompsize) {
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compsize = zs.total_out;
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} else {
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method = kZipCompressionNone;
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}
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} else {
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lfile = elfwriter_reserve(elf, lfilehdrsize + uncompsize);
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}
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if (method == kZipCompressionNone) {
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memcpy(lfile + lfilehdrsize, data, uncompsize);
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}
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era = method ? kZipEra1993 : kZipEra1989;
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EmitZipLfileHdr(lfile, name, namesize, crc, era, gflags, method, mtime, mdate,
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compsize, uncompsize);
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elfwriter_commit(elf, lfilehdrsize + compsize);
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lfilesym = elfwriter_appendsym(elf, gc(xasprintf("%s%s", "zip+lfile:", name)),
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ELF64_ST_INFO(STB_LOCAL, STT_OBJECT),
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STV_DEFAULT, 0, lfilehdrsize);
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elfwriter_appendsym(elf, symbol, ELF64_ST_INFO(STB_GLOBAL, STT_OBJECT),
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STV_DEFAULT, lfilehdrsize, compsize);
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elfwriter_finishsection(elf);
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/* emit central directory record */
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elfwriter_align(elf, 1, 0);
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elfwriter_startsection(elf,
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gc(xasprintf("%s%s", ZIP_DIRECTORY_SECTION, name)),
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SHT_PROGBITS, SHF_ALLOC);
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EmitZipCdirHdr((cfile = elfwriter_reserve(elf, kZipCdirHdrLinkableSize)),
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name, namesize, crc, era, gflags, method, mtime, mdate, iattrs,
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dosmode, mode, compsize, uncompsize, commentsize, mtim, atim,
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ctim);
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elfwriter_appendsym(elf, gc(xasprintf("%s%s", "zip+cdir:", name)),
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ELF64_ST_INFO(STB_LOCAL, STT_OBJECT), STV_DEFAULT, 0,
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kZipCdirHdrLinkableSize);
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elfwriter_appendrela(elf, kZipCfileOffsetOffset, lfilesym, R_X86_64_32,
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-imagebase);
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elfwriter_commit(elf, kZipCdirHdrLinkableSize);
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elfwriter_finishsection(elf);
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}
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