lib/rpmlead.c

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