diff options
Diffstat (limited to 'src/logic/tpax_init_ustar_header.c')
| -rw-r--r-- | src/logic/tpax_init_ustar_header.c | 218 |
1 files changed, 0 insertions, 218 deletions
diff --git a/src/logic/tpax_init_ustar_header.c b/src/logic/tpax_init_ustar_header.c deleted file mode 100644 index fb83ba4..0000000 --- a/src/logic/tpax_init_ustar_header.c +++ /dev/null @@ -1,218 +0,0 @@ -/**************************************************************/ -/* tpax: a topological pax implementation */ -/* Copyright (C) 2020--2021 SysDeer Technologies, LLC */ -/* Released under GPLv2 and GPLv3; see COPYING.TPAX. */ -/**************************************************************/ - -#include <stdint.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> -#include <fcntl.h> -#include <errno.h> -#include <grp.h> -#include <pwd.h> -#include <sys/stat.h> - -#include <tpax/tpax.h> -#include <tpax/tpax_specs.h> -#include "tpax_driver_impl.h" - -#ifndef ssizeof -#define ssizeof(x) (ssize_t)(sizeof(x)) -#endif - -static void tpax_octal_write(char * ch, ssize_t len, uint64_t val) -{ - for (--len,--len; len>=0 ; len--) { - ch[len] = val % 8 + '0'; - val /= 8; - } -} - -int tpax_init_ustar_header( - const struct tpax_driver_ctx * dctx, - const char * path, - const struct stat * st, - const char * linkname, - struct tpax_ustar_header * uhdr) -{ - size_t len; - const char * cap; - const char * mark; - unsigned char * uch; - unsigned char * uchcap; - size_t lnklen; - size_t stsize; - int64_t stmtim; - uint32_t chksum; - char typeflag; - struct group grp; - struct group * grpres; - struct passwd pwd; - struct passwd * pwdres; - char pwdbuf[2048]; - - /* size & mtime validation */ - stsize = S_ISREG(st->st_mode) ? st->st_size : 0; - stmtim = st->st_mtim.tv_sec; - - if (stsize > 077777777777) - return -1; - - if ((stmtim < 0) || (stmtim > 077777777777)) - return -1; - - /* linkname validation */ - if (S_ISLNK(st->st_mode) && !linkname) - return -1; - - lnklen = S_ISLNK(st->st_mode) - ? strnlen(linkname,sizeof(uhdr->u_linkname) + 1) - : 0; - - if (lnklen > sizeof(uhdr->u_linkname)) - return -1; - - /* typeflag validation */ - if (S_ISREG(st->st_mode)) - typeflag = TPAX_USTAR_TYPEFLAG_REGFILE; - else if (S_ISLNK(st->st_mode)) - typeflag = TPAX_USTAR_TYPEFLAG_SYMLINK; - else if (S_ISDIR(st->st_mode)) - typeflag = TPAX_USTAR_TYPEFLAG_DIRFILE; - else if (S_ISCHR(st->st_mode)) - typeflag = TPAX_USTAR_TYPEFLAG_CHARDEV; - else if (S_ISBLK(st->st_mode)) - typeflag = TPAX_USTAR_TYPEFLAG_BLKDEV; - else if (S_ISFIFO(st->st_mode)) - typeflag = TPAX_USTAR_TYPEFLAG_FIFODEV; - else - return -1; - - /* cap (without the trailing slash) */ - mark = &path[strlen(path)]; - cap = mark; - - for (--cap; (*cap == '/') && (cap > path); cap--) - (void)0; - - cap = ((cap == path) && (path[0] == '/')) - ? mark : &cap[1]; - - /* path solely consists of slash symbols? */ - if ((cap == mark) && (path[0] =='/')) { - if ((cap - path) > (ssizeof(uhdr->u_prefix) + 1 + ssizeof(uhdr->u_name))) - return -1; - - else if ((cap - path) <= ssizeof(uhdr->u_name)) - mark = 0; - - else - mark -= sizeof(uhdr->u_name); - - /* path entirely fits in u_name? */ - } else if ((cap - path) <= ssizeof(uhdr->u_name)) { - mark = 0; - - /* split between u_prefix and u_name as needed */ - } else { - mark = cap; - - do { - for (--mark; (mark > path) && (*mark != '/'); mark--) - (void)0; - } while ((mark - path) > ssizeof(uhdr->u_prefix)); - } - - /* one shot */ - memset(uhdr,0,sizeof(*uhdr)); - - /* u_name, u_prefix */ - if (mark) { - memcpy(uhdr->u_prefix,path,mark-path); - memcpy(uhdr->u_name,&mark[1],cap - mark); - } else { - memcpy(uhdr->u_name,path,cap - path); - } - - /* u_mode */ - tpax_octal_write(uhdr->u_mode,ssizeof(uhdr->u_mode),st->st_mode & TPAX_USTAR_MODE_MASK); - - /* u_uid, u_gid, u_uname, u_gname */ - if (dctx->cctx->drvflags & TPAX_DRIVER_WRITE_FORMAT_RUSTAR) { - tpax_octal_write(uhdr->u_uid,ssizeof(uhdr->u_uid),0); - tpax_octal_write(uhdr->u_gid,ssizeof(uhdr->u_gid),0); - } else { - if ((uint64_t)st->st_uid <= 07777777) - tpax_octal_write(uhdr->u_uid,ssizeof(uhdr->u_uid),st->st_uid); - else - tpax_octal_write(uhdr->u_uid,ssizeof(uhdr->u_uid),0); - - if ((uint64_t)st->st_gid <= 07777777) - tpax_octal_write(uhdr->u_gid,ssizeof(uhdr->u_gid),st->st_gid); - else - tpax_octal_write(uhdr->u_gid,ssizeof(uhdr->u_gid),0); - - pwdres = 0; - grpres = 0; - - getpwuid_r( - st->st_uid,&pwd, - pwdbuf,sizeof(pwdbuf), - &pwdres); - - if (pwdres && pwd.pw_name) - if ((len = strlen(pwd.pw_name)) < sizeof(uhdr->u_uname)) - memcpy(uhdr->u_uname,pwd.pw_name,len); - - getgrgid_r( - st->st_gid,&grp, - pwdbuf,sizeof(pwdbuf), - &grpres); - - if (grpres && grp.gr_name) - if ((len = strlen(grp.gr_name)) < sizeof(uhdr->u_gname)) - memcpy(uhdr->u_gname,grp.gr_name,len); - } - - /* u_size, u_mtime */ - tpax_octal_write(uhdr->u_size,ssizeof(uhdr->u_size),stsize); - tpax_octal_write(uhdr->u_mtime,ssizeof(uhdr->u_mtime),stmtim); - - /* u_typeflag */ - uhdr->u_typeflag[0] = typeflag; - - /* u_linkname */ - if (lnklen) - memcpy(uhdr->u_linkname,linkname,lnklen); - - /* u_magic */ - uhdr->u_magic[0] = 'u'; - uhdr->u_magic[1] = 's'; - uhdr->u_magic[2] = 't'; - uhdr->u_magic[3] = 'a'; - uhdr->u_magic[4] = 'r'; - - /* u_version */ - uhdr->u_version[0] = '0'; - uhdr->u_version[1] = '0'; - - /* u_devmajor, u_devminor */ - tpax_octal_write(uhdr->u_devmajor,ssizeof(uhdr->u_devmajor),0); - tpax_octal_write(uhdr->u_devminor,ssizeof(uhdr->u_devminor),0); - - /* u_chksum */ - uch = (unsigned char *)uhdr->u_name; - uchcap = (unsigned char *)uhdr->u_pad; - - for (chksum=0; uch<uchcap; uch++) - chksum += *uch; - - chksum += sizeof(uhdr->u_chksum) * ' '; - - tpax_octal_write(uhdr->u_chksum,ssizeof(uhdr->u_chksum),chksum); - - /* all done; caller may now change REGFILE to HARDLINK */ - return 0; -} |