lib/rpmlead.c

   1 /** \ingroup lead
   2  * \file lib/rpmlead.c
   3  */
   4
   5 #include "system.h"
   6
   7 #if HAVE_MACHINE_TYPES_H
   8 # include <machine/types.h>
   9 #endif
  10
  11 #include <netinet/in.h>
  12
  13 #include <rpmlib.h>
  14
  15 #include "signature.h"
  16 #include "rpmlead.h"
  17 #include "debug.h"
  18
  19 /*@unchecked@*/ /*@observer@*/
  20 static unsigned char lead_magic[] = {
  21     RPMLEAD_MAGIC0, RPMLEAD_MAGIC1, RPMLEAD_MAGIC2, RPMLEAD_MAGIC3
  22 };
  23
  24 /* The lead needs to be 8 byte aligned */
  25
  26 rpmRC writeLead(FD_t fd, const struct rpmlead *lead)
  27 {
  28     struct rpmlead l;
  29
  30 /*@-boundswrite@*/
  31     memcpy(&l, lead, sizeof(l));
  32
  33     memcpy(&l.magic, lead_magic, sizeof(l.magic));
  34 /*@=boundswrite@*/
  35     l.type = htons(l.type);
  36     l.archnum = htons(l.archnum);
  37     l.osnum = htons(l.osnum);
  38     l.signature_type = htons(l.signature_type);
  39
  40 /*@-boundswrite@*/
  41     if (Fwrite(&l, 1, sizeof(l), fd) != sizeof(l))
  42         return RPMRC_FAIL;
  43 /*@=boundswrite@*/
  44
  45     return RPMRC_OK;
  46 }
  47
  48 rpmRC readLead(FD_t fd, struct rpmlead *lead)
  49 {
  50 /*@-boundswrite@*/
  51     memset(lead, 0, sizeof(*lead));
  52 /*@=boundswrite@*/
  53     /*@-type@*/ /* FIX: remove timed read */
  54     if (timedRead(fd, (char *)lead, sizeof(*lead)) != sizeof(*lead)) {
  55         if (Ferror(fd)) {
  56             rpmError(RPMERR_READ, _("read failed: %s (%d)\n"),
  57                         Fstrerror(fd), errno);
  58             return RPMRC_FAIL;
  59         }
  60         return RPMRC_NOTFOUND;
  61     }
  62     /*@=type@*/
  63
  64     if (memcmp(lead->magic, lead_magic, sizeof(lead_magic)))
  65         return RPMRC_NOTFOUND;
  66     lead->type = ntohs(lead->type);
  67     lead->archnum = ntohs(lead->archnum);
  68     lead->osnum = ntohs(lead->osnum);
  69     lead->signature_type = ntohs(lead->signature_type);
  70     if (lead->signature_type != RPMSIGTYPE_HEADERSIG)
  71         return RPMRC_NOTFOUND;
  72
  73     return RPMRC_OK;
  74 }