19502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes/* file.c - describe file type 29502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes * 39502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes * Copyright 2016 The Android Open Source Project 49502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes * 59502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/file.html 69502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes 7493dc573825a862ee533c8aaf91ab23112b591c2Elliott HughesUSE_FILE(NEWTOY(file, "<1hL[!hL]", TOYFLAG_USR|TOYFLAG_BIN)) 89502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes 99502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughesconfig FILE 109502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes bool "file" 114e21ddd440f5d1381c96ae6465a12888dcb23446Rob Landley default y 129502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes help 13493dc573825a862ee533c8aaf91ab23112b591c2Elliott Hughes usage: file [-hL] [file...] 149502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes 159502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes Examine the given files and describe their content types. 16493dc573825a862ee533c8aaf91ab23112b591c2Elliott Hughes 17493dc573825a862ee533c8aaf91ab23112b591c2Elliott Hughes -h don't follow symlinks (default) 18493dc573825a862ee533c8aaf91ab23112b591c2Elliott Hughes -L follow symlinks 199502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes*/ 209502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes 219502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes#define FOR_file 229502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes#include "toys.h" 239502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes 249502a77ea0a16c395407f31af0bbb0afd0680adbElliott HughesGLOBALS( 259502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes int max_name_len; 269502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes) 279502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes 28cc4a1f4d520f090bd563647df2614d09b66bd54aRob Landley// We don't trust elf.h to be there, and two codepaths for 32/64 is awkward 29cc4a1f4d520f090bd563647df2614d09b66bd54aRob Landley// anyway, so calculate struct offsets manually. (It's a fixed ABI.) 30c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughesstatic void do_elf_file(int fd, struct stat *sb) 319502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes{ 32cc4a1f4d520f090bd563647df2614d09b66bd54aRob Landley int endian = toybuf[5], bits = toybuf[4], i, j; 330332b60f62d71da61634cc69416129dfc64dced8Rob Landley int64_t (*elf_int)(void *ptr, unsigned size) = peek_le; 340332b60f62d71da61634cc69416129dfc64dced8Rob Landley // Values from include/linux/elf-em.h (plus arch/*/include/asm/elf.h) 3544c7958214e1690e820aaddf808267e0bf78df46Rob Landley // Names are linux/arch/ directory (sometimes before 32/64 bit merges) 3644c7958214e1690e820aaddf808267e0bf78df46Rob Landley struct {int val; char *name;} type[] = {{0x9026, "alpha"}, {93, "arc"}, 3744c7958214e1690e820aaddf808267e0bf78df46Rob Landley {195, "arcv2"}, {40, "arm"}, {183, "arm64"}, {0x18ad, "avr32"}, 3844c7958214e1690e820aaddf808267e0bf78df46Rob Landley {106, "blackfin"}, {140, "c6x"}, {23, "cell"}, {76, "cris"}, 3944c7958214e1690e820aaddf808267e0bf78df46Rob Landley {0x5441, "frv"}, {46, "h8300"}, {164, "hexagon"}, {50, "ia64"}, 4044c7958214e1690e820aaddf808267e0bf78df46Rob Landley {88, "m32r"}, {0x9041, "m32r"}, {4, "m68k"}, {174, "metag"}, 4144c7958214e1690e820aaddf808267e0bf78df46Rob Landley {0xbaab, "microblaze"}, {8, "mips"}, {10, "mips-old"}, {89, "mn10300"}, 424b141e67eefc396687f22f8c136267c0f8081e05Rob Landley {0xbeef, "mn10300-old"}, {113, "nios2"}, {92, "openrisc"}, 4344c7958214e1690e820aaddf808267e0bf78df46Rob Landley {0x8472, "openrisc-old"}, {15, "parisc"}, {20, "ppc"}, {21, "ppc64"}, 4444c7958214e1690e820aaddf808267e0bf78df46Rob Landley {22, "s390"}, {0xa390, "s390-old"}, {135, "score"}, {42, "sh"}, 4544c7958214e1690e820aaddf808267e0bf78df46Rob Landley {2, "sparc"}, {18, "sparc8+"}, {43, "sparc9"}, {188, "tile"}, 4644c7958214e1690e820aaddf808267e0bf78df46Rob Landley {191, "tilegx"}, {3, "386"}, {6, "486"}, {62, "x86-64"}, {94, "xtensa"}, 4744c7958214e1690e820aaddf808267e0bf78df46Rob Landley {0xabc7, "xtensa-old"} 4844c7958214e1690e820aaddf808267e0bf78df46Rob Landley }; 49c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes int dynamic = 0; 50c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes int stripped = 1; 51c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes char *map; 52c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes off_t phoff, shoff; 53fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes int phentsize, phnum, shsize, shnum; 540332b60f62d71da61634cc69416129dfc64dced8Rob Landley 552e4aff2fd31fb9d949d6c47da1e46b97ecc23d24Rob Landley printf("ELF "); 562e4aff2fd31fb9d949d6c47da1e46b97ecc23d24Rob Landley 572e4aff2fd31fb9d949d6c47da1e46b97ecc23d24Rob Landley // executable (ELF says this is short but reality says byte, not MSB swapped) 582e4aff2fd31fb9d949d6c47da1e46b97ecc23d24Rob Landley i = toybuf[16]; 592e4aff2fd31fb9d949d6c47da1e46b97ecc23d24Rob Landley if (i == 1) printf("relocatable"); 602e4aff2fd31fb9d949d6c47da1e46b97ecc23d24Rob Landley else if (i == 2) printf("executable"); 612e4aff2fd31fb9d949d6c47da1e46b97ecc23d24Rob Landley else if (i == 3) printf("shared object"); 622e4aff2fd31fb9d949d6c47da1e46b97ecc23d24Rob Landley else if (i == 4) printf("core dump"); 632e4aff2fd31fb9d949d6c47da1e46b97ecc23d24Rob Landley else printf("(bad type %d)", i); 642e4aff2fd31fb9d949d6c47da1e46b97ecc23d24Rob Landley printf(", "); 659502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes 669502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes // "64-bit" 672e4aff2fd31fb9d949d6c47da1e46b97ecc23d24Rob Landley if (bits == 1) printf("32-bit "); 682e4aff2fd31fb9d949d6c47da1e46b97ecc23d24Rob Landley else if (bits == 2) printf("64-bit "); 69cc4a1f4d520f090bd563647df2614d09b66bd54aRob Landley else { 702e4aff2fd31fb9d949d6c47da1e46b97ecc23d24Rob Landley printf("(bad class %d) ", bits); 71cc4a1f4d520f090bd563647df2614d09b66bd54aRob Landley bits = 0; 72cc4a1f4d520f090bd563647df2614d09b66bd54aRob Landley } 73cc4a1f4d520f090bd563647df2614d09b66bd54aRob Landley 749502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes // "LSB" 752e4aff2fd31fb9d949d6c47da1e46b97ecc23d24Rob Landley if (endian == 1) printf("LSB "); 76cc4a1f4d520f090bd563647df2614d09b66bd54aRob Landley else if (endian == 2) { 772e4aff2fd31fb9d949d6c47da1e46b97ecc23d24Rob Landley printf("MSB "); 780332b60f62d71da61634cc69416129dfc64dced8Rob Landley elf_int = peek_be; 790332b60f62d71da61634cc69416129dfc64dced8Rob Landley } else { 802e4aff2fd31fb9d949d6c47da1e46b97ecc23d24Rob Landley printf("(bad endian %d) \n", endian); 81cc4a1f4d520f090bd563647df2614d09b66bd54aRob Landley endian = 0; 829502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes } 839502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes 842e4aff2fd31fb9d949d6c47da1e46b97ecc23d24Rob Landley // e_machine, ala "x86", from big table above 852e4aff2fd31fb9d949d6c47da1e46b97ecc23d24Rob Landley j = elf_int(toybuf+18, 2); 862e4aff2fd31fb9d949d6c47da1e46b97ecc23d24Rob Landley for (i = 0; i<ARRAY_LEN(type); i++) if (j==type[i].val) break; 872e4aff2fd31fb9d949d6c47da1e46b97ecc23d24Rob Landley if (i<ARRAY_LEN(type)) printf("%s", type[i].name); 882e4aff2fd31fb9d949d6c47da1e46b97ecc23d24Rob Landley else printf("(unknown arch %d)", j); 89cc4a1f4d520f090bd563647df2614d09b66bd54aRob Landley 90cc4a1f4d520f090bd563647df2614d09b66bd54aRob Landley bits--; 91c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes // If what we've seen so far doesn't seem consistent, bail. 92fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes if (!((bits&1)==bits && endian)) { 93c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes printf(", corrupt?\n"); 94c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes return; 95c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes } 96c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes 97c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes // Stash what we need from the header; it's okay to reuse toybuf after this. 98fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes phentsize = elf_int(toybuf+42+12*bits, 2); 99c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes phnum = elf_int(toybuf+44+12*bits, 2); 100c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes phoff = elf_int(toybuf+28+4*bits, 4+4*bits); 101c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes shsize = elf_int(toybuf+46+12*bits, 2); 102c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes shnum = elf_int(toybuf+48+12*bits, 2); 103c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes shoff = elf_int(toybuf+32+8*bits, 4+4*bits); 104c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes 105fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes // With binutils, phentsize seems to only be non-zero if phnum is non-zero. 106fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes // Such ELF files are rare, but do exist. (Android's crtbegin files, say.) 107fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes if (phnum && (phentsize != 32+24*bits)) { 108fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes printf(", corrupt phentsize %d?\n", phentsize); 109fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes return; 110fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes } 111fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes 11212f0744f340746b3a1c1accfdf993d6548f33e56Elliott Hughes map = xmmap(0, sb->st_size, PROT_READ, MAP_SHARED, fd, 0); 113c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes 114fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes // We need to read the phdrs for dynamic vs static. 115c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes // (Note: fields got reordered for 64 bit) 116c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes for (i = 0; i<phnum; i++) { 117fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes char *phdr = map+phoff+i*phentsize; 118c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes int p_type = elf_int(phdr, 4); 119c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes long long p_offset, p_filesz; 120c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes 121c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes if (p_type==2 /*PT_DYNAMIC*/) dynamic = 1; 122c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes if (p_type!=3 /*PT_INTERP*/ && p_type!=4 /*PT_NOTE*/) continue; 123c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes 124c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes j = bits+1; 125c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes p_offset = elf_int(phdr+4*j, 4*j); 126c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes p_filesz = elf_int(phdr+16*j, 4*j); 127c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes 128c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes if (p_type==3 /*PT_INTERP*/) 129c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes printf(", dynamic (%.*s)", (int)p_filesz, map+p_offset); 130fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes } 131fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes if (!dynamic) printf(", static"); 132fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes 133fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes // We need to read the shdrs for stripped/unstripped and any notes. 134fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes // Notes are in program headers *and* section headers, but some files don't 135fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes // contain program headers, so we prefer to check here. 136fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes // (Note: fields got reordered for 64 bit) 137fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes for (i = 0; i<shnum; i++) { 138fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes char *shdr = map+shoff+i*shsize; 139fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes int sh_type = elf_int(shdr+4, 4); 140fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes long sh_offset = elf_int(shdr+8+8*(bits+1), 4*(bits+1)); 141fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes int sh_size = elf_int(shdr+8+12*(bits+1), 4); 142fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes 143fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes if (sh_type == 2 /*SHT_SYMTAB*/) { 144fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes stripped = 0; 145fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes break; 146fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes } else if (sh_type == 7 /*SHT_NOTE*/) { 147fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes char *note = map+sh_offset; 148c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes 149fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes // An ELF note is a sequence of entries, each consisting of an 150c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes // ndhr followed by n_namesz+n_descsz bytes of data (each of those 151c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes // rounded up to the next 4 bytes, without this being reflected in 152c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes // the header byte counts themselves). 153fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes while (sh_size >= 3*4) { // Don't try to read a truncated entry. 154c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes int n_namesz = elf_int(note, 4); 155c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes int n_descsz = elf_int(note+4, 4); 156c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes int n_type = elf_int(note+8, 4); 157c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes int notesz = 3*4 + ((n_namesz+3)&~3) + ((n_descsz+3)&~3); 158c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes 159c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes if (n_namesz==4 && !memcmp(note+12, "GNU", 4)) { 160fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes if (n_type==3 /*NT_GNU_BUILD_ID*/) { 1618a34cbb5666a80153ea06ba8d59f7406f311bb7aElliott Hughes printf(", BuildID="); 162c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes for (j = 0; j < n_descsz; ++j) printf("%02x", note[16 + j]); 163c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes } 164c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes } else if (n_namesz==8 && !memcmp(note+12, "Android", 8)) { 165fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes if (n_type==1 /*.android.note.ident*/) { 166fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes printf(", for Android %d", (int)elf_int(note+20, 4)); 167fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes if (n_descsz > 24) 168fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes printf(", built by NDK %.64s (%.64s)", note+24, note+24+64); 169fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes } 170c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes } 171c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes 172c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes note += notesz; 173fa84155632bf1c65f455b9872ee35a53cd0d2a19Elliott Hughes sh_size -= notesz; 174cc4a1f4d520f090bd563647df2614d09b66bd54aRob Landley } 175cc4a1f4d520f090bd563647df2614d09b66bd54aRob Landley } 176cc4a1f4d520f090bd563647df2614d09b66bd54aRob Landley } 177c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes printf(", %sstripped", stripped ? "" : "not "); 1780332b60f62d71da61634cc69416129dfc64dced8Rob Landley xputc('\n'); 179c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes 180c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes munmap(map, sb->st_size); 1819502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes} 1829502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes 183c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughesstatic void do_regular_file(int fd, char *name, struct stat *sb) 1849502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes{ 1850332b60f62d71da61634cc69416129dfc64dced8Rob Landley char *s; 1860332b60f62d71da61634cc69416129dfc64dced8Rob Landley int len = read(fd, s = toybuf, sizeof(toybuf)-256); 187830f2561757083ec6d34dc92c675447e91c9ed81Isaac Dunham int magic; 1889502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes 1890332b60f62d71da61634cc69416129dfc64dced8Rob Landley if (len<0) perror_msg("%s", name); 1909502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes 191c5e7ee27f606ed0bdb20d54e9de1a4adb56fc5d3Elliott Hughes if (len>40 && strstart(&s, "\177ELF")) do_elf_file(fd, sb); 1926783156813d6c1c8469a7535f3cb575a776ceaa6Elliott Hughes else if (len>=8 && strstart(&s, "!<arch>\n")) xprintf("ar archive\n"); 193cc4a1f4d520f090bd563647df2614d09b66bd54aRob Landley else if (len>28 && strstart(&s, "\x89PNG\x0d\x0a\x1a\x0a")) { 1940332b60f62d71da61634cc69416129dfc64dced8Rob Landley // PNG is big-endian: https://www.w3.org/TR/PNG/#7Integers-and-byte-order 1950332b60f62d71da61634cc69416129dfc64dced8Rob Landley int chunk_length = peek_be(s, 4); 1969502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes 1970332b60f62d71da61634cc69416129dfc64dced8Rob Landley xprintf("PNG image data"); 1989502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes 1990332b60f62d71da61634cc69416129dfc64dced8Rob Landley // The IHDR chunk comes first: https://www.w3.org/TR/PNG/#11IHDR 2000332b60f62d71da61634cc69416129dfc64dced8Rob Landley s += 4; 2010332b60f62d71da61634cc69416129dfc64dced8Rob Landley if (chunk_length == 13 && strstart(&s, "IHDR")) { 2020332b60f62d71da61634cc69416129dfc64dced8Rob Landley // https://www.w3.org/TR/PNG/#6Colour-values 2030332b60f62d71da61634cc69416129dfc64dced8Rob Landley char *c = 0, *colors[] = {"grayscale", 0, "color RGB", "indexed color", 2040332b60f62d71da61634cc69416129dfc64dced8Rob Landley "grayscale with alpha", 0, "color RGBA"}; 2059502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes 2060332b60f62d71da61634cc69416129dfc64dced8Rob Landley if (s[9]<ARRAY_LEN(colors)) c = colors[s[9]]; 2070332b60f62d71da61634cc69416129dfc64dced8Rob Landley if (!c) c = "unknown"; 2089502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes 2090332b60f62d71da61634cc69416129dfc64dced8Rob Landley xprintf(", %d x %d, %d-bit/%s, %sinterlaced", (int)peek_be(s, 4), 2100332b60f62d71da61634cc69416129dfc64dced8Rob Landley (int)peek_be(s+4, 4), s[8], c, s[12] ? "" : "non-"); 2110332b60f62d71da61634cc69416129dfc64dced8Rob Landley } 2129502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes 2130332b60f62d71da61634cc69416129dfc64dced8Rob Landley xputc('\n'); 2149502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes 2150332b60f62d71da61634cc69416129dfc64dced8Rob Landley // https://www.w3.org/Graphics/GIF/spec-gif89a.txt 2160332b60f62d71da61634cc69416129dfc64dced8Rob Landley } else if (len>16 && (strstart(&s, "GIF87a") || strstart(&s, "GIF89a"))) 2170332b60f62d71da61634cc69416129dfc64dced8Rob Landley xprintf("GIF image data, %d x %d\n", 2180332b60f62d71da61634cc69416129dfc64dced8Rob Landley (int)peek_le(s, 2), (int)peek_le(s+8, 2)); 2199502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes 2200332b60f62d71da61634cc69416129dfc64dced8Rob Landley // TODO: parsing JPEG for width/height is harder than GIF or PNG. 2216232dc68c4169332950333b259943e175ddcfaeaRob Landley else if (len>32 && !memcmp(toybuf, "\xff\xd8", 2)) xputs("JPEG image data"); 2229502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes 2230332b60f62d71da61634cc69416129dfc64dced8Rob Landley // https://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html 2240332b60f62d71da61634cc69416129dfc64dced8Rob Landley else if (len>8 && strstart(&s, "\xca\xfe\xba\xbe")) 2250332b60f62d71da61634cc69416129dfc64dced8Rob Landley xprintf("Java class file, version %d.%d\n", 226ffc6fbbde3eeca29d1eb3470610eb7ae5b9025f1Elliott Hughes (int)peek_be(s+2, 2), (int)peek_be(s, 2)); 2279502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes 228830f2561757083ec6d34dc92c675447e91c9ed81Isaac Dunham // https://people.freebsd.org/~kientzle/libarchive/man/cpio.5.txt 229830f2561757083ec6d34dc92c675447e91c9ed81Isaac Dunham // the lengths for cpio are size of header + 9 bytes, since any valid 230830f2561757083ec6d34dc92c675447e91c9ed81Isaac Dunham // cpio archive ends with a record for "TARGET!!!" 231830f2561757083ec6d34dc92c675447e91c9ed81Isaac Dunham else if (len>85 && strstart(&s, "07070")) { 232830f2561757083ec6d34dc92c675447e91c9ed81Isaac Dunham char *cpioformat = "unknown type"; 2336232dc68c4169332950333b259943e175ddcfaeaRob Landley 234830f2561757083ec6d34dc92c675447e91c9ed81Isaac Dunham if (toybuf[5] == '7') cpioformat = "pre-SVR4 or odc"; 235830f2561757083ec6d34dc92c675447e91c9ed81Isaac Dunham else if (toybuf[5] == '1') cpioformat = "SVR4 with no CRC"; 236830f2561757083ec6d34dc92c675447e91c9ed81Isaac Dunham else if (toybuf[5] == '2') cpioformat = "SVR4 with CRC"; 237830f2561757083ec6d34dc92c675447e91c9ed81Isaac Dunham xprintf("ASCII cpio archive (%s)\n", cpioformat); 2389f42e832a186bb3f5320581a3a713d0a8a9c8384Rob Landley } else if (len>33 && (magic=peek(&s,2), magic==0143561 || magic==070707)) { 239830f2561757083ec6d34dc92c675447e91c9ed81Isaac Dunham if (magic == 0143561) printf("byte-swapped "); 240830f2561757083ec6d34dc92c675447e91c9ed81Isaac Dunham xprintf("cpio archive\n"); 241830f2561757083ec6d34dc92c675447e91c9ed81Isaac Dunham // tar archive (ustar/pax or gnu) 2426232dc68c4169332950333b259943e175ddcfaeaRob Landley } else if (len>500 && !strncmp(s+257, "ustar", 5)) 243830f2561757083ec6d34dc92c675447e91c9ed81Isaac Dunham xprintf("POSIX tar archive%s\n", strncmp(s+262," ",2)?"":" (GNU)"); 244830f2561757083ec6d34dc92c675447e91c9ed81Isaac Dunham // zip/jar/apk archive, ODF/OOXML document, or such 2456232dc68c4169332950333b259943e175ddcfaeaRob Landley else if (len>5 && strstart(&s, "PK\03\04")) { 2466232dc68c4169332950333b259943e175ddcfaeaRob Landley int ver = toybuf[4]; 2476232dc68c4169332950333b259943e175ddcfaeaRob Landley 248830f2561757083ec6d34dc92c675447e91c9ed81Isaac Dunham xprintf("Zip archive data"); 2496232dc68c4169332950333b259943e175ddcfaeaRob Landley if (ver) xprintf(", requires at least v%d.%d to extract", ver/10, ver%10); 250830f2561757083ec6d34dc92c675447e91c9ed81Isaac Dunham xputc('\n'); 2516232dc68c4169332950333b259943e175ddcfaeaRob Landley } else if (len>4 && strstart(&s, "BZh") && isdigit(*s)) 252af92dfdad8b8f2e8d35a1959832a3b6939261d9fElliott Hughes xprintf("bzip2 compressed data, block size = %c00k\n", *s); 2536232dc68c4169332950333b259943e175ddcfaeaRob Landley else if (len>10 && strstart(&s, "\x1f\x8b")) xputs("gzip compressed data"); 254d1c664a31b656c1541c79044aa44467420f78f14Rob Landley else { 2550332b60f62d71da61634cc69416129dfc64dced8Rob Landley char *what = 0; 2560332b60f62d71da61634cc69416129dfc64dced8Rob Landley int i, bytes; 2579502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes 2580332b60f62d71da61634cc69416129dfc64dced8Rob Landley // If shell script, report which interpreter 2590332b60f62d71da61634cc69416129dfc64dced8Rob Landley if (len>3 && strstart(&s, "#!")) { 260ffc6fbbde3eeca29d1eb3470610eb7ae5b9025f1Elliott Hughes // Whitespace is allowed between the #! and the interpreter 261ffc6fbbde3eeca29d1eb3470610eb7ae5b9025f1Elliott Hughes while (isspace(*s)) s++; 262ffc6fbbde3eeca29d1eb3470610eb7ae5b9025f1Elliott Hughes if (strstart(&s, "/usr/bin/env")) while (isspace(*s)) s++; 2630332b60f62d71da61634cc69416129dfc64dced8Rob Landley for (what = s; (s-toybuf)<len && !isspace(*s); s++); 2640332b60f62d71da61634cc69416129dfc64dced8Rob Landley strcpy(s, " script"); 2659502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes 2660332b60f62d71da61634cc69416129dfc64dced8Rob Landley // Distinguish ASCII text, UTF-8 text, or data 2670332b60f62d71da61634cc69416129dfc64dced8Rob Landley } else for (i = 0; i<len; ++i) { 2689502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes if (!(isprint(toybuf[i]) || isspace(toybuf[i]))) { 2690332b60f62d71da61634cc69416129dfc64dced8Rob Landley wchar_t wc; 2700332b60f62d71da61634cc69416129dfc64dced8Rob Landley if ((bytes = mbrtowc(&wc, s+i, len-i, 0))>0 && wcwidth(wc)>=0) { 2710332b60f62d71da61634cc69416129dfc64dced8Rob Landley i += bytes-1; 2720332b60f62d71da61634cc69416129dfc64dced8Rob Landley if (!what) what = "UTF-8 text"; 2730332b60f62d71da61634cc69416129dfc64dced8Rob Landley } else { 2740332b60f62d71da61634cc69416129dfc64dced8Rob Landley what = "data"; 2750332b60f62d71da61634cc69416129dfc64dced8Rob Landley break; 2760332b60f62d71da61634cc69416129dfc64dced8Rob Landley } 2779502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes } 2789502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes } 2790332b60f62d71da61634cc69416129dfc64dced8Rob Landley xputs(what ? what : "ASCII text"); 2809502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes } 2819502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes} 2829502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes 2830332b60f62d71da61634cc69416129dfc64dced8Rob Landleyvoid file_main(void) 2849502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes{ 2854b141e67eefc396687f22f8c136267c0f8081e05Rob Landley char **arg; 2869502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes 2874b141e67eefc396687f22f8c136267c0f8081e05Rob Landley for (arg = toys.optargs; *arg; ++arg) { 2884b141e67eefc396687f22f8c136267c0f8081e05Rob Landley int name_len = strlen(*arg); 2890332b60f62d71da61634cc69416129dfc64dced8Rob Landley 2909502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes if (name_len > TT.max_name_len) TT.max_name_len = name_len; 2919502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes } 2929502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes 2934b141e67eefc396687f22f8c136267c0f8081e05Rob Landley // Can't use loopfiles here because it doesn't call function when can't open 2944b141e67eefc396687f22f8c136267c0f8081e05Rob Landley for (arg = toys.optargs; *arg; arg++) { 2954b141e67eefc396687f22f8c136267c0f8081e05Rob Landley char *name = *arg, *what = "cannot open"; 2969f42e832a186bb3f5320581a3a713d0a8a9c8384Rob Landley struct stat sb; 2979f42e832a186bb3f5320581a3a713d0a8a9c8384Rob Landley int fd = !strcmp(name, "-"); 2984b141e67eefc396687f22f8c136267c0f8081e05Rob Landley 2994b141e67eefc396687f22f8c136267c0f8081e05Rob Landley xprintf("%s: %*s", name, (int)(TT.max_name_len - strlen(name)), ""); 3004b141e67eefc396687f22f8c136267c0f8081e05Rob Landley 301493dc573825a862ee533c8aaf91ab23112b591c2Elliott Hughes if (fd || !((toys.optflags & FLAG_L) ? stat : lstat)(name, &sb)) { 3029f42e832a186bb3f5320581a3a713d0a8a9c8384Rob Landley if (fd || S_ISREG(sb.st_mode)) { 3039f42e832a186bb3f5320581a3a713d0a8a9c8384Rob Landley if (!sb.st_size) what = "empty"; 3049f42e832a186bb3f5320581a3a713d0a8a9c8384Rob Landley else if ((fd = openro(name, O_RDONLY)) != -1) { 3059f42e832a186bb3f5320581a3a713d0a8a9c8384Rob Landley do_regular_file(fd, name, &sb); 3062e4aff2fd31fb9d949d6c47da1e46b97ecc23d24Rob Landley if (fd) close(fd); 3079f42e832a186bb3f5320581a3a713d0a8a9c8384Rob Landley continue; 3084b141e67eefc396687f22f8c136267c0f8081e05Rob Landley } 3099f42e832a186bb3f5320581a3a713d0a8a9c8384Rob Landley } else if (S_ISFIFO(sb.st_mode)) what = "fifo"; 3109f42e832a186bb3f5320581a3a713d0a8a9c8384Rob Landley else if (S_ISBLK(sb.st_mode)) what = "block special"; 3114b141e67eefc396687f22f8c136267c0f8081e05Rob Landley else if (S_ISCHR(sb.st_mode)) what = "character special"; 3124b141e67eefc396687f22f8c136267c0f8081e05Rob Landley else if (S_ISDIR(sb.st_mode)) what = "directory"; 3134b141e67eefc396687f22f8c136267c0f8081e05Rob Landley else if (S_ISSOCK(sb.st_mode)) what = "socket"; 3144b141e67eefc396687f22f8c136267c0f8081e05Rob Landley else if (S_ISLNK(sb.st_mode)) what = "symbolic link"; 3154b141e67eefc396687f22f8c136267c0f8081e05Rob Landley else what = "unknown"; 3164b141e67eefc396687f22f8c136267c0f8081e05Rob Landley } 3174b141e67eefc396687f22f8c136267c0f8081e05Rob Landley 3184b141e67eefc396687f22f8c136267c0f8081e05Rob Landley xputs(what); 3194b141e67eefc396687f22f8c136267c0f8081e05Rob Landley } 3209502a77ea0a16c395407f31af0bbb0afd0680adbElliott Hughes} 321