diff options
Diffstat (limited to 'toys/pending/file.c')
| -rw-r--r-- | toys/pending/file.c | 308 |
1 files changed, 0 insertions, 308 deletions
diff --git a/toys/pending/file.c b/toys/pending/file.c deleted file mode 100644 index b53bec0a..00000000 --- a/toys/pending/file.c +++ /dev/null @@ -1,308 +0,0 @@ -/* file.c - describe file type - * - * Copyright 2016 The Android Open Source Project - * - * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/file.html - * - * TODO: ar - -USE_FILE(NEWTOY(file, "<1", TOYFLAG_USR|TOYFLAG_BIN)) - -config FILE - bool "file" - default n - help - usage: file [file...] - - Examine the given files and describe their content types. -*/ - -#define FOR_file -#include "toys.h" - -GLOBALS( - int max_name_len; -) - -// We don't trust elf.h to be there, and two codepaths for 32/64 is awkward -// anyway, so calculate struct offsets manually. (It's a fixed ABI.) -static void do_elf_file(int fd, struct stat *sb) -{ - int endian = toybuf[5], bits = toybuf[4], i, j; - int64_t (*elf_int)(void *ptr, unsigned size) = peek_le; - // Values from include/linux/elf-em.h (plus arch/*/include/asm/elf.h) - // Names are linux/arch/ directory (sometimes before 32/64 bit merges) - struct {int val; char *name;} type[] = {{0x9026, "alpha"}, {93, "arc"}, - {195, "arcv2"}, {40, "arm"}, {183, "arm64"}, {0x18ad, "avr32"}, - {106, "blackfin"}, {140, "c6x"}, {23, "cell"}, {76, "cris"}, - {0x5441, "frv"}, {46, "h8300"}, {164, "hexagon"}, {50, "ia64"}, - {88, "m32r"}, {0x9041, "m32r"}, {4, "m68k"}, {174, "metag"}, - {0xbaab, "microblaze"}, {8, "mips"}, {10, "mips-old"}, {89, "mn10300"}, - {0xbeef, "mn10300-old"}, {113, "nios2"}, {92, "openrisc"}, - {0x8472, "openrisc-old"}, {15, "parisc"}, {20, "ppc"}, {21, "ppc64"}, - {22, "s390"}, {0xa390, "s390-old"}, {135, "score"}, {42, "sh"}, - {2, "sparc"}, {18, "sparc8+"}, {43, "sparc9"}, {188, "tile"}, - {191, "tilegx"}, {3, "386"}, {6, "486"}, {62, "x86-64"}, {94, "xtensa"}, - {0xabc7, "xtensa-old"} - }; - int dynamic = 0; - int stripped = 1; - char *map; - off_t phoff, shoff; - int phsize, phnum, shsize, shnum; - - printf("ELF "); - - // executable (ELF says this is short but reality says byte, not MSB swapped) - i = toybuf[16]; - if (i == 1) printf("relocatable"); - else if (i == 2) printf("executable"); - else if (i == 3) printf("shared object"); - else if (i == 4) printf("core dump"); - else printf("(bad type %d)", i); - printf(", "); - - // "64-bit" - if (bits == 1) printf("32-bit "); - else if (bits == 2) printf("64-bit "); - else { - printf("(bad class %d) ", bits); - bits = 0; - } - - // "LSB" - if (endian == 1) printf("LSB "); - else if (endian == 2) { - printf("MSB "); - elf_int = peek_be; - } else { - printf("(bad endian %d) \n", endian); - endian = 0; - } - - // e_machine, ala "x86", from big table above - j = elf_int(toybuf+18, 2); - for (i = 0; i<ARRAY_LEN(type); i++) if (j==type[i].val) break; - if (i<ARRAY_LEN(type)) printf("%s", type[i].name); - else printf("(unknown arch %d)", j); - - bits--; - // If what we've seen so far doesn't seem consistent, bail. - if (!((bits&1)==bits && endian && - (i = elf_int(toybuf+42+12*bits, 2)) == 32+24*bits)) { - printf(", corrupt?\n"); - return; - } - - // Stash what we need from the header; it's okay to reuse toybuf after this. - phsize = i; - phnum = elf_int(toybuf+44+12*bits, 2); - phoff = elf_int(toybuf+28+4*bits, 4+4*bits); - shsize = elf_int(toybuf+46+12*bits, 2); - shnum = elf_int(toybuf+48+12*bits, 2); - shoff = elf_int(toybuf+32+8*bits, 4+4*bits); - - map = mmap(0, sb->st_size, PROT_READ, MAP_SHARED, fd, 0); - if (!map) perror_exit("mmap"); - - // We need to read the phdrs for dynamic vs static and any notes. - // (Note: fields got reordered for 64 bit) - for (i = 0; i<phnum; i++) { - char *phdr = map+phoff+i*phsize; - int p_type = elf_int(phdr, 4); - long long p_offset, p_filesz; - - if (p_type==2 /*PT_DYNAMIC*/) dynamic = 1; - if (p_type!=3 /*PT_INTERP*/ && p_type!=4 /*PT_NOTE*/) continue; - - j = bits+1; - p_offset = elf_int(phdr+4*j, 4*j); - p_filesz = elf_int(phdr+16*j, 4*j); - - if (p_type==3 /*PT_INTERP*/) - printf(", dynamic (%.*s)", (int)p_filesz, map+p_offset); - else { - char *note = map+p_offset; - - // A PT_NOTE phdr is a sequence of entries, each consisting of an - // ndhr followed by n_namesz+n_descsz bytes of data (each of those - // rounded up to the next 4 bytes, without this being reflected in - // the header byte counts themselves). - while (p_filesz >= 3*4) { // Don't try to read a truncated entry. - int n_namesz = elf_int(note, 4); - int n_descsz = elf_int(note+4, 4); - int n_type = elf_int(note+8, 4); - int notesz = 3*4 + ((n_namesz+3)&~3) + ((n_descsz+3)&~3); - - if (n_namesz==4 && !memcmp(note+12, "GNU", 4)) { - if (n_type == 3 /*NT_GNU_BUILD_ID*/) { - printf(", BuildID[%s]=", (n_descsz==20)?"sha1":"md5"); - for (j = 0; j < n_descsz; ++j) printf("%02x", note[16 + j]); - } - } else if (n_namesz==8 && !memcmp(note+12, "Android", 8)) { - if (n_type==1) printf(", for Android %d", (int)elf_int(note+20, 4)); - } - - note += notesz; - p_filesz -= notesz; - } - } - } - if (!dynamic) printf(", static"); - - // We need to read the shdrs for stripped/unstripped. - // (Note: fields got reordered for 64 bit) - for (i = 0; i<shnum; i++) { - char *shdr = map+shoff+i*shsize; - int sh_type = elf_int(shdr+4, 4); - - if (sh_type == 2 /*SHT_SYMTAB*/) { - stripped = 0; - break; - } - } - printf(", %sstripped", stripped ? "" : "not "); - xputc('\n'); - - munmap(map, sb->st_size); -} - -static void do_regular_file(int fd, char *name, struct stat *sb) -{ - char *s; - int len = read(fd, s = toybuf, sizeof(toybuf)-256); - int magic; - - if (len<0) perror_msg("%s", name); - - if (len>40 && strstart(&s, "\177ELF")) do_elf_file(fd, sb); - else if (len>28 && strstart(&s, "\x89PNG\x0d\x0a\x1a\x0a")) { - // PNG is big-endian: https://www.w3.org/TR/PNG/#7Integers-and-byte-order - int chunk_length = peek_be(s, 4); - - xprintf("PNG image data"); - - // The IHDR chunk comes first: https://www.w3.org/TR/PNG/#11IHDR - s += 4; - if (chunk_length == 13 && strstart(&s, "IHDR")) { - // https://www.w3.org/TR/PNG/#6Colour-values - char *c = 0, *colors[] = {"grayscale", 0, "color RGB", "indexed color", - "grayscale with alpha", 0, "color RGBA"}; - - if (s[9]<ARRAY_LEN(colors)) c = colors[s[9]]; - if (!c) c = "unknown"; - - xprintf(", %d x %d, %d-bit/%s, %sinterlaced", (int)peek_be(s, 4), - (int)peek_be(s+4, 4), s[8], c, s[12] ? "" : "non-"); - } - - xputc('\n'); - - // https://www.w3.org/Graphics/GIF/spec-gif89a.txt - } else if (len>16 && (strstart(&s, "GIF87a") || strstart(&s, "GIF89a"))) - xprintf("GIF image data, %d x %d\n", - (int)peek_le(s, 2), (int)peek_le(s+8, 2)); - - // TODO: parsing JPEG for width/height is harder than GIF or PNG. - else if (len>32 && memcmp(toybuf, "\xff\xd8", 2) == 0) - xprintf("JPEG image data\n"); - - // https://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html - else if (len>8 && strstart(&s, "\xca\xfe\xba\xbe")) - xprintf("Java class file, version %d.%d\n", - (int)peek_be(s+2, 2), (int)peek_be(s, 2)); - - // https://people.freebsd.org/~kientzle/libarchive/man/cpio.5.txt - // the lengths for cpio are size of header + 9 bytes, since any valid - // cpio archive ends with a record for "TARGET!!!" - else if (len>85 && strstart(&s, "07070")) { - char *cpioformat = "unknown type"; - if (toybuf[5] == '7') cpioformat = "pre-SVR4 or odc"; - else if (toybuf[5] == '1') cpioformat = "SVR4 with no CRC"; - else if (toybuf[5] == '2') cpioformat = "SVR4 with CRC"; - xprintf("ASCII cpio archive (%s)\n", cpioformat); - } - else if (len>33 && (magic=peek(&s,2), magic==0143561 || magic==070707)) { - if (magic == 0143561) printf("byte-swapped "); - xprintf("cpio archive\n"); - } - // tar archive (ustar/pax or gnu) - else if (len>500 && !strncmp(s+257, "ustar", 5)) { - xprintf("POSIX tar archive%s\n", strncmp(s+262," ",2)?"":" (GNU)"); - } - // zip/jar/apk archive, ODF/OOXML document, or such - else if (len>5 && strstart(&s, "PK\03\04")) { - int ver = (int)(char)(toybuf[4]); - xprintf("Zip archive data"); - if (ver) - xprintf(", requires at least v%d.%d to extract", ver/10, ver%10); - xputc('\n'); - } - else { - char *what = 0; - int i, bytes; - - // If shell script, report which interpreter - if (len>3 && strstart(&s, "#!")) { - // Whitespace is allowed between the #! and the interpreter - while (isspace(*s)) s++; - if (strstart(&s, "/usr/bin/env")) while (isspace(*s)) s++; - for (what = s; (s-toybuf)<len && !isspace(*s); s++); - strcpy(s, " script"); - - // Distinguish ASCII text, UTF-8 text, or data - } else for (i = 0; i<len; ++i) { - if (!(isprint(toybuf[i]) || isspace(toybuf[i]))) { - wchar_t wc; - if ((bytes = mbrtowc(&wc, s+i, len-i, 0))>0 && wcwidth(wc)>=0) { - i += bytes-1; - if (!what) what = "UTF-8 text"; - } else { - what = "data"; - break; - } - } - } - xputs(what ? what : "ASCII text"); - } -} - -void file_main(void) -{ - char **arg; - - for (arg = toys.optargs; *arg; ++arg) { - int name_len = strlen(*arg); - - if (name_len > TT.max_name_len) TT.max_name_len = name_len; - } - - // Can't use loopfiles here because it doesn't call function when can't open - for (arg = toys.optargs; *arg; arg++) { - struct stat sb; - char *name = *arg, *what = "cannot open"; - - xprintf("%s: %*s", name, (int)(TT.max_name_len - strlen(name)), ""); - - if (!lstat(name, &sb)) { - if (S_ISFIFO(sb.st_mode)) what = "fifo"; - else if (S_ISREG(sb.st_mode)) { - int fd = !strcmp(name, "-") ? 0 : open(name, O_RDONLY); - - if (fd!=-1) { - if (!sb.st_size) what = "empty"; - else do_regular_file(fd, name, &sb); - if (fd) close(fd); - if (sb.st_size) continue; - } - } else if (S_ISBLK(sb.st_mode)) what = "block special"; - else if (S_ISCHR(sb.st_mode)) what = "character special"; - else if (S_ISDIR(sb.st_mode)) what = "directory"; - else if (S_ISSOCK(sb.st_mode)) what = "socket"; - else if (S_ISLNK(sb.st_mode)) what = "symbolic link"; - else what = "unknown"; - } - - xputs(what); - } -} |