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lib/cpio.c

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00001 
00010 #include "system.h"
00011 
00012 #include "fsm.h"
00013 #include "rpmerr.h"
00014 #include "debug.h"
00015 
00016 /*@access FSM_t @*/
00017 
00018 /*@-exportheadervar@*/
00019 extern int _fsm_debug;
00020 /*@=exportheadervar@*/
00021 
00030 static int strntoul(const char *str, /*@out@*/char **endptr, int base, int num)
00031         /*@modifies *endptr @*/
00032 {
00033     char * buf, * end;
00034     unsigned long ret;
00035 
00036     buf = alloca(num + 1);
00037     strncpy(buf, str, num);
00038     buf[num] = '\0';
00039 
00040     ret = strtoul(buf, &end, base);
00041     if (*end != '\0')
00042         *endptr = ((char *)str) + (end - buf);  /* XXX discards const */
00043     else
00044         *endptr = ((char *)str) + strlen(buf);
00045 
00046     return ret;
00047 }
00048 
00049 #define GET_NUM_FIELD(phys, log) \
00050         log = strntoul(phys, &end, 16, sizeof(phys)); \
00051         if ( (end - phys) != sizeof(phys) ) return CPIOERR_BAD_HEADER;
00052 #define SET_NUM_FIELD(phys, val, space) \
00053         sprintf(space, "%8.8lx", (unsigned long) (val)); \
00054         memcpy(phys, space, 8);
00055 
00056 int cpioTrailerWrite(FSM_t fsm)
00057 {
00058     struct cpioCrcPhysicalHeader * hdr =
00059         (struct cpioCrcPhysicalHeader *)fsm->rdbuf;
00060     int rc;
00061 
00062     memset(hdr, '0', PHYS_HDR_SIZE);
00063     memcpy(hdr->magic, CPIO_NEWC_MAGIC, sizeof(hdr->magic));
00064     memcpy(hdr->nlink, "00000001", 8);
00065     memcpy(hdr->namesize, "0000000b", 8);
00066     memcpy(fsm->rdbuf + PHYS_HDR_SIZE, CPIO_TRAILER, sizeof(CPIO_TRAILER));
00067 
00068     /* XXX DWRITE uses rdnb for I/O length. */
00069     fsm->rdnb = PHYS_HDR_SIZE + sizeof(CPIO_TRAILER);
00070     rc = fsmStage(fsm, FSM_DWRITE);
00071 
00072     /*
00073      * GNU cpio pads to 512 bytes here, but we don't. This may matter for
00074      * tape device(s) and/or concatenated cpio archives. <shrug>
00075      */
00076     if (!rc)
00077         rc = fsmStage(fsm, FSM_PAD);
00078 
00079     return rc;
00080 }
00081 
00082 int cpioHeaderWrite(FSM_t fsm, struct stat * st)
00083 {
00084     struct cpioCrcPhysicalHeader * hdr = (struct cpioCrcPhysicalHeader *)fsm->rdbuf;
00085     char field[64];
00086     size_t len;
00087     dev_t dev;
00088     int rc = 0;
00089 
00090     memcpy(hdr->magic, CPIO_NEWC_MAGIC, sizeof(hdr->magic));
00091     SET_NUM_FIELD(hdr->inode, st->st_ino, field);
00092     SET_NUM_FIELD(hdr->mode, st->st_mode, field);
00093     SET_NUM_FIELD(hdr->uid, st->st_uid, field);
00094     SET_NUM_FIELD(hdr->gid, st->st_gid, field);
00095     SET_NUM_FIELD(hdr->nlink, st->st_nlink, field);
00096     SET_NUM_FIELD(hdr->mtime, st->st_mtime, field);
00097     SET_NUM_FIELD(hdr->filesize, st->st_size, field);
00098 
00099     dev = major((unsigned)st->st_dev); SET_NUM_FIELD(hdr->devMajor, dev, field);
00100     dev = minor((unsigned)st->st_dev); SET_NUM_FIELD(hdr->devMinor, dev, field);
00101     dev = major((unsigned)st->st_rdev); SET_NUM_FIELD(hdr->rdevMajor, dev, field);
00102     dev = minor((unsigned)st->st_rdev); SET_NUM_FIELD(hdr->rdevMinor, dev, field);
00103 
00104     len = strlen(fsm->path) + 1; SET_NUM_FIELD(hdr->namesize, len, field);
00105     memcpy(hdr->checksum, "00000000", 8);
00106     memcpy(fsm->rdbuf + PHYS_HDR_SIZE, fsm->path, len);
00107 
00108     /* XXX DWRITE uses rdnb for I/O length. */
00109     fsm->rdnb = PHYS_HDR_SIZE + len;
00110     rc = fsmStage(fsm, FSM_DWRITE);
00111     if (!rc && fsm->rdnb != fsm->wrnb)
00112         rc = CPIOERR_WRITE_FAILED;
00113     if (!rc)
00114         rc = fsmStage(fsm, FSM_PAD);
00115     return rc;
00116 }
00117 
00118 int cpioHeaderRead(FSM_t fsm, struct stat * st)
00119         /*@modifies fsm, *st @*/
00120 {
00121     struct cpioCrcPhysicalHeader hdr;
00122     int nameSize;
00123     char * end;
00124     int major, minor;
00125     int rc = 0;
00126 
00127     fsm->wrlen = PHYS_HDR_SIZE;
00128     rc = fsmStage(fsm, FSM_DREAD);
00129     if (!rc && fsm->rdnb != fsm->wrlen)
00130         rc = CPIOERR_READ_FAILED;
00131     if (rc) return rc;
00132     memcpy(&hdr, fsm->wrbuf, fsm->rdnb);
00133 
00134     if (strncmp(CPIO_CRC_MAGIC, hdr.magic, sizeof(CPIO_CRC_MAGIC)-1) &&
00135         strncmp(CPIO_NEWC_MAGIC, hdr.magic, sizeof(CPIO_NEWC_MAGIC)-1))
00136         return CPIOERR_BAD_MAGIC;
00137 
00138     GET_NUM_FIELD(hdr.inode, st->st_ino);
00139     GET_NUM_FIELD(hdr.mode, st->st_mode);
00140     GET_NUM_FIELD(hdr.uid, st->st_uid);
00141     GET_NUM_FIELD(hdr.gid, st->st_gid);
00142     GET_NUM_FIELD(hdr.nlink, st->st_nlink);
00143     GET_NUM_FIELD(hdr.mtime, st->st_mtime);
00144     GET_NUM_FIELD(hdr.filesize, st->st_size);
00145 
00146     GET_NUM_FIELD(hdr.devMajor, major);
00147     GET_NUM_FIELD(hdr.devMinor, minor);
00148     /*@-shiftimplementation@*/
00149     st->st_dev = makedev(major, minor);
00150     /*@=shiftimplementation@*/
00151 
00152     GET_NUM_FIELD(hdr.rdevMajor, major);
00153     GET_NUM_FIELD(hdr.rdevMinor, minor);
00154     /*@-shiftimplementation@*/
00155     st->st_rdev = makedev(major, minor);
00156     /*@=shiftimplementation@*/
00157 
00158     GET_NUM_FIELD(hdr.namesize, nameSize);
00159     if (nameSize >= fsm->wrsize)
00160         return CPIOERR_BAD_HEADER;
00161 
00162     {   char * t = xmalloc(nameSize + 1);
00163         fsm->wrlen = nameSize;
00164         rc = fsmStage(fsm, FSM_DREAD);
00165         if (!rc && fsm->rdnb != fsm->wrlen)
00166             rc = CPIOERR_BAD_HEADER;
00167         if (rc) {
00168             t = _free(t);
00169             fsm->path = NULL;
00170             return rc;
00171         }
00172         memcpy(t, fsm->wrbuf, fsm->rdnb);
00173         t[nameSize] = '\0';
00174         fsm->path = t;
00175     }
00176 
00177     return 0;
00178 }
00179 
00180 const char *const cpioStrerror(int rc)
00181 {
00182     static char msg[256];
00183     char *s;
00184     int l, myerrno = errno;
00185 
00186     strcpy(msg, "cpio: ");
00187     /*@-branchstate@*/
00188     switch (rc) {
00189     default:
00190         s = msg + strlen(msg);
00191         sprintf(s, _("(error 0x%x)"), (unsigned)rc);
00192         s = NULL;
00193         break;
00194     case CPIOERR_BAD_MAGIC:     s = _("Bad magic");             break;
00195     case CPIOERR_BAD_HEADER:    s = _("Bad/unreadable  header");break;
00196 
00197     case CPIOERR_OPEN_FAILED:   s = "open";     break;
00198     case CPIOERR_CHMOD_FAILED:  s = "chmod";    break;
00199     case CPIOERR_CHOWN_FAILED:  s = "chown";    break;
00200     case CPIOERR_WRITE_FAILED:  s = "write";    break;
00201     case CPIOERR_UTIME_FAILED:  s = "utime";    break;
00202     case CPIOERR_UNLINK_FAILED: s = "unlink";   break;
00203     case CPIOERR_RENAME_FAILED: s = "rename";   break;
00204     case CPIOERR_SYMLINK_FAILED: s = "symlink"; break;
00205     case CPIOERR_STAT_FAILED:   s = "stat";     break;
00206     case CPIOERR_LSTAT_FAILED:  s = "lstat";    break;
00207     case CPIOERR_MKDIR_FAILED:  s = "mkdir";    break;
00208     case CPIOERR_RMDIR_FAILED:  s = "rmdir";    break;
00209     case CPIOERR_MKNOD_FAILED:  s = "mknod";    break;
00210     case CPIOERR_MKFIFO_FAILED: s = "mkfifo";   break;
00211     case CPIOERR_LINK_FAILED:   s = "link";     break;
00212     case CPIOERR_READLINK_FAILED: s = "readlink";       break;
00213     case CPIOERR_READ_FAILED:   s = "read";     break;
00214     case CPIOERR_COPY_FAILED:   s = "copy";     break;
00215 
00216     case CPIOERR_HDR_SIZE:      s = _("Header size too big");   break;
00217     case CPIOERR_UNKNOWN_FILETYPE: s = _("Unknown file type");  break;
00218     case CPIOERR_MISSING_HARDLINK: s = _("Missing hard link(s)"); break;
00219     case CPIOERR_MD5SUM_MISMATCH: s = _("MD5 sum mismatch");    break;
00220     case CPIOERR_INTERNAL:      s = _("Internal error");        break;
00221     case CPIOERR_UNMAPPED_FILE: s = _("Archive file not in header"); break;
00222     }
00223     /*@=branchstate@*/
00224 
00225     l = sizeof(msg) - strlen(msg) - 1;
00226     if (s != NULL) {
00227         if (l > 0) strncat(msg, s, l);
00228         l -= strlen(s);
00229     }
00230     /*@-branchstate@*/
00231     if ((rc & CPIOERR_CHECK_ERRNO) && myerrno) {
00232         s = _(" failed - ");
00233         if (l > 0) strncat(msg, s, l);
00234         l -= strlen(s);
00235         if (l > 0) strncat(msg, strerror(myerrno), l);
00236     }
00237     /*@=branchstate@*/
00238     return msg;
00239 }

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