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 static unsigned char lead_magic[] = {
  20     RPMLEAD_MAGIC0, RPMLEAD_MAGIC1, RPMLEAD_MAGIC2, RPMLEAD_MAGIC3
  21 };
  22
  23 /* The lead needs to be 8 byte aligned */
  24
  25 rpmRC writeLead(FD_t fd, const struct rpmlead *lead)
  26 {
  27     struct rpmlead l;
  28
  29     memcpy(&l, lead, sizeof(l));
  30
  31     memcpy(&l.magic, lead_magic, sizeof(l.magic));
  32     l.type = htons(l.type);
  33     l.archnum = htons(l.archnum);
  34     l.osnum = htons(l.osnum);
  35     l.signature_type = htons(l.signature_type);
  36
  37     if (Fwrite(&l, 1, sizeof(l), fd) != sizeof(l))
  38         return RPMRC_FAIL;
  39
  40     return RPMRC_OK;
  41 }
  42
  43 rpmRC readLead(FD_t fd, struct rpmlead *lead)
  44 {
  45     memset(lead, 0, sizeof(*lead));
  46     /* FIX: remove timed read */
  47     if (timedRead(fd, (char *)lead, sizeof(*lead)) != sizeof(*lead)) {
  48         if (Ferror(fd)) {
  49             rpmError(RPMERR_READ, _("read failed: %s (%d)\n"),
  50                         Fstrerror(fd), errno);
  51             return RPMRC_FAIL;
  52         }
  53         return RPMRC_NOTFOUND;
  54     }
  55
  56     if (memcmp(lead->magic, lead_magic, sizeof(lead_magic)))
  57         return RPMRC_NOTFOUND;
  58     lead->type = ntohs(lead->type);
  59     lead->archnum = ntohs(lead->archnum);
  60     lead->osnum = ntohs(lead->osnum);
  61     lead->signature_type = ntohs(lead->signature_type);
  62     if (lead->signature_type != RPMSIGTYPE_HEADERSIG)
  63         return RPMRC_NOTFOUND;
  64
  65     return RPMRC_OK;
  66 }