240 lines
7.1 KiB
C
240 lines
7.1 KiB
C
/** \ingroup payload
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* \file lib/cpio.c
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* Handle cpio payloads within rpm packages.
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*
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* \warning FIXME: We don't translate between cpio and system mode bits! These
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* should both be the same, but really odd things are going to happen if
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* that's not true!
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*/
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#include "system.h"
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#include "fsm.h"
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#include "rpmerr.h"
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#include "debug.h"
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/*@access FSM_t @*/
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/*@-exportheadervar@*/
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extern int _fsm_debug;
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/*@=exportheadervar@*/
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/**
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* Convert string to unsigned integer (with buffer size check).
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* @param str input string
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* @retval endptr address of 1st character not processed
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* @param base numerical conversion base
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* @param num max no. of bytes to read
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* @return converted integer
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*/
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static int strntoul(const char *str, /*@out@*/char **endptr, int base, int num)
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/*@modifies *endptr @*/
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{
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char * buf, * end;
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unsigned long ret;
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buf = alloca(num + 1);
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strncpy(buf, str, num);
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buf[num] = '\0';
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ret = strtoul(buf, &end, base);
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if (*end != '\0')
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*endptr = ((char *)str) + (end - buf); /* XXX discards const */
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else
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*endptr = ((char *)str) + strlen(buf);
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return ret;
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}
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#define GET_NUM_FIELD(phys, log) \
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log = strntoul(phys, &end, 16, sizeof(phys)); \
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if ( (end - phys) != sizeof(phys) ) return CPIOERR_BAD_HEADER;
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#define SET_NUM_FIELD(phys, val, space) \
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sprintf(space, "%8.8lx", (unsigned long) (val)); \
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memcpy(phys, space, 8);
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int cpioTrailerWrite(FSM_t fsm)
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{
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struct cpioCrcPhysicalHeader * hdr =
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(struct cpioCrcPhysicalHeader *)fsm->rdbuf;
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int rc;
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memset(hdr, '0', PHYS_HDR_SIZE);
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memcpy(hdr->magic, CPIO_NEWC_MAGIC, sizeof(hdr->magic));
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memcpy(hdr->nlink, "00000001", 8);
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memcpy(hdr->namesize, "0000000b", 8);
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memcpy(fsm->rdbuf + PHYS_HDR_SIZE, CPIO_TRAILER, sizeof(CPIO_TRAILER));
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/* XXX DWRITE uses rdnb for I/O length. */
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fsm->rdnb = PHYS_HDR_SIZE + sizeof(CPIO_TRAILER);
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rc = fsmStage(fsm, FSM_DWRITE);
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/*
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* GNU cpio pads to 512 bytes here, but we don't. This may matter for
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* tape device(s) and/or concatenated cpio archives. <shrug>
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*/
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if (!rc)
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rc = fsmStage(fsm, FSM_PAD);
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return rc;
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}
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int cpioHeaderWrite(FSM_t fsm, struct stat * st)
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{
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struct cpioCrcPhysicalHeader * hdr = (struct cpioCrcPhysicalHeader *)fsm->rdbuf;
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char field[64];
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size_t len;
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dev_t dev;
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int rc = 0;
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memcpy(hdr->magic, CPIO_NEWC_MAGIC, sizeof(hdr->magic));
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SET_NUM_FIELD(hdr->inode, st->st_ino, field);
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SET_NUM_FIELD(hdr->mode, st->st_mode, field);
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SET_NUM_FIELD(hdr->uid, st->st_uid, field);
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SET_NUM_FIELD(hdr->gid, st->st_gid, field);
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SET_NUM_FIELD(hdr->nlink, st->st_nlink, field);
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SET_NUM_FIELD(hdr->mtime, st->st_mtime, field);
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SET_NUM_FIELD(hdr->filesize, st->st_size, field);
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dev = major((unsigned)st->st_dev); SET_NUM_FIELD(hdr->devMajor, dev, field);
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dev = minor((unsigned)st->st_dev); SET_NUM_FIELD(hdr->devMinor, dev, field);
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dev = major((unsigned)st->st_rdev); SET_NUM_FIELD(hdr->rdevMajor, dev, field);
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dev = minor((unsigned)st->st_rdev); SET_NUM_FIELD(hdr->rdevMinor, dev, field);
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len = strlen(fsm->path) + 1; SET_NUM_FIELD(hdr->namesize, len, field);
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memcpy(hdr->checksum, "00000000", 8);
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memcpy(fsm->rdbuf + PHYS_HDR_SIZE, fsm->path, len);
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/* XXX DWRITE uses rdnb for I/O length. */
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fsm->rdnb = PHYS_HDR_SIZE + len;
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rc = fsmStage(fsm, FSM_DWRITE);
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if (!rc && fsm->rdnb != fsm->wrnb)
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rc = CPIOERR_WRITE_FAILED;
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if (!rc)
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rc = fsmStage(fsm, FSM_PAD);
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return rc;
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}
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int cpioHeaderRead(FSM_t fsm, struct stat * st)
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/*@modifies fsm, *st @*/
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{
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struct cpioCrcPhysicalHeader hdr;
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int nameSize;
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char * end;
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int major, minor;
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int rc = 0;
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fsm->wrlen = PHYS_HDR_SIZE;
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rc = fsmStage(fsm, FSM_DREAD);
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if (!rc && fsm->rdnb != fsm->wrlen)
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rc = CPIOERR_READ_FAILED;
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if (rc) return rc;
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memcpy(&hdr, fsm->wrbuf, fsm->rdnb);
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if (strncmp(CPIO_CRC_MAGIC, hdr.magic, sizeof(CPIO_CRC_MAGIC)-1) &&
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strncmp(CPIO_NEWC_MAGIC, hdr.magic, sizeof(CPIO_NEWC_MAGIC)-1))
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return CPIOERR_BAD_MAGIC;
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GET_NUM_FIELD(hdr.inode, st->st_ino);
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GET_NUM_FIELD(hdr.mode, st->st_mode);
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GET_NUM_FIELD(hdr.uid, st->st_uid);
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GET_NUM_FIELD(hdr.gid, st->st_gid);
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GET_NUM_FIELD(hdr.nlink, st->st_nlink);
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GET_NUM_FIELD(hdr.mtime, st->st_mtime);
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GET_NUM_FIELD(hdr.filesize, st->st_size);
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GET_NUM_FIELD(hdr.devMajor, major);
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GET_NUM_FIELD(hdr.devMinor, minor);
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/*@-shiftimplementation@*/
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st->st_dev = makedev(major, minor);
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/*@=shiftimplementation@*/
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GET_NUM_FIELD(hdr.rdevMajor, major);
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GET_NUM_FIELD(hdr.rdevMinor, minor);
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/*@-shiftimplementation@*/
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st->st_rdev = makedev(major, minor);
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/*@=shiftimplementation@*/
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GET_NUM_FIELD(hdr.namesize, nameSize);
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if (nameSize >= fsm->wrsize)
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return CPIOERR_BAD_HEADER;
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{ char * t = xmalloc(nameSize + 1);
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fsm->wrlen = nameSize;
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rc = fsmStage(fsm, FSM_DREAD);
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if (!rc && fsm->rdnb != fsm->wrlen)
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rc = CPIOERR_BAD_HEADER;
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if (rc) {
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t = _free(t);
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fsm->path = NULL;
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return rc;
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}
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memcpy(t, fsm->wrbuf, fsm->rdnb);
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t[nameSize] = '\0';
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fsm->path = t;
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}
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return 0;
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}
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const char *const cpioStrerror(int rc)
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{
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static char msg[256];
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char *s;
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int l, myerrno = errno;
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strcpy(msg, "cpio: ");
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/*@-branchstate@*/
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switch (rc) {
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default:
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s = msg + strlen(msg);
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sprintf(s, _("(error 0x%x)"), (unsigned)rc);
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s = NULL;
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break;
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case CPIOERR_BAD_MAGIC: s = _("Bad magic"); break;
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case CPIOERR_BAD_HEADER: s = _("Bad/unreadable header");break;
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case CPIOERR_OPEN_FAILED: s = "open"; break;
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case CPIOERR_CHMOD_FAILED: s = "chmod"; break;
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case CPIOERR_CHOWN_FAILED: s = "chown"; break;
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case CPIOERR_WRITE_FAILED: s = "write"; break;
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case CPIOERR_UTIME_FAILED: s = "utime"; break;
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case CPIOERR_UNLINK_FAILED: s = "unlink"; break;
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case CPIOERR_RENAME_FAILED: s = "rename"; break;
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case CPIOERR_SYMLINK_FAILED: s = "symlink"; break;
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case CPIOERR_STAT_FAILED: s = "stat"; break;
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case CPIOERR_LSTAT_FAILED: s = "lstat"; break;
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case CPIOERR_MKDIR_FAILED: s = "mkdir"; break;
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case CPIOERR_RMDIR_FAILED: s = "rmdir"; break;
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case CPIOERR_MKNOD_FAILED: s = "mknod"; break;
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case CPIOERR_MKFIFO_FAILED: s = "mkfifo"; break;
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case CPIOERR_LINK_FAILED: s = "link"; break;
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case CPIOERR_READLINK_FAILED: s = "readlink"; break;
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case CPIOERR_READ_FAILED: s = "read"; break;
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case CPIOERR_COPY_FAILED: s = "copy"; break;
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case CPIOERR_HDR_SIZE: s = _("Header size too big"); break;
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case CPIOERR_UNKNOWN_FILETYPE: s = _("Unknown file type"); break;
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case CPIOERR_MISSING_HARDLINK: s = _("Missing hard link(s)"); break;
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case CPIOERR_MD5SUM_MISMATCH: s = _("MD5 sum mismatch"); break;
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case CPIOERR_INTERNAL: s = _("Internal error"); break;
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case CPIOERR_UNMAPPED_FILE: s = _("Archive file not in header"); break;
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}
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/*@=branchstate@*/
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l = sizeof(msg) - strlen(msg) - 1;
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if (s != NULL) {
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if (l > 0) strncat(msg, s, l);
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l -= strlen(s);
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}
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/*@-branchstate@*/
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if ((rc & CPIOERR_CHECK_ERRNO) && myerrno) {
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s = _(" failed - ");
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if (l > 0) strncat(msg, s, l);
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l -= strlen(s);
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if (l > 0) strncat(msg, strerror(myerrno), l);
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}
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/*@=branchstate@*/
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return msg;
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}
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