LCOV - code coverage report
Current view: top level - src/protocol2 - blk.c (source / functions) Hit Total Coverage
Test: burp-coverage-clean.info Lines: 106 112 94.6 %
Date: 2018-01-01 Functions: 22 23 95.7 %

          Line data    Source code
       1             : #include "../burp.h"
       2             : #include "blk.h"
       3             : #include "../alloc.h"
       4             : #include "../hexmap.h"
       5             : #include "../iobuf.h"
       6             : #include "../log.h"
       7             : #include "../protocol2/rabin/rabin.h"
       8             : #include "rabin/rconf.h"
       9             : 
      10      235807 : struct blk *blk_alloc(void)
      11             : {
      12      235831 :         return (struct blk *)calloc_w(1, sizeof(struct blk), __func__);
      13             : }
      14             : 
      15          24 : struct blk *blk_alloc_with_data(uint32_t max_data_length)
      16             : {
      17          24 :         struct blk *blk=NULL;
      18          24 :         if(!(blk=blk_alloc())
      19          22 :           || !(blk->data=(char *)
      20          22 :                 calloc_w(1, sizeof(char)*max_data_length, __func__)))
      21             :                         goto end;
      22          22 :         return blk;
      23             : end:
      24           2 :         blk_free(&blk);
      25           2 :         return NULL;
      26             : }
      27             : 
      28          14 : void blk_free_content(struct blk *blk)
      29             : {
      30      235857 :         if(!blk) return;
      31      235843 :         free_w(&blk->data);
      32             : }
      33             : 
      34      235879 : void blk_free(struct blk **blk)
      35             : {
      36      471758 :         if(!blk || !*blk) return;
      37      235829 :         blk_free_content(*blk);
      38      235829 :         free_v((void **)blk);
      39             : }
      40             : 
      41          21 : static int md5_generation(uint8_t md5sum[], const char *data, uint32_t length)
      42             : {
      43             :         MD5_CTX md5;
      44          21 :         if(!MD5_Init(&md5)
      45          21 :           || !MD5_Update(&md5, data, length)
      46          21 :           || !MD5_Final(md5sum, &md5))
      47             :         {
      48           0 :                 logp("MD5 generation failed.\n");
      49           0 :                 return -1;
      50             :         }
      51             :         return 0;
      52             : }
      53             : 
      54          19 : int blk_md5_update(struct blk *blk)
      55             : {
      56          19 :         return md5_generation(blk->md5sum, blk->data, blk->length);
      57             : }
      58             : 
      59       29154 : int blk_is_zero_length(struct blk *blk)
      60             : {
      61       58308 :         return !blk->fingerprint // All zeroes.
      62       29154 :           && !memcmp(blk->md5sum, md5sum_of_empty_string, MD5_DIGEST_LENGTH);
      63             : }
      64             : 
      65           3 : int blk_verify(uint64_t fingerprint, uint8_t *md5sum,
      66             :         char *data, size_t length)
      67             : {
      68             :         uint8_t md5sum_new[MD5_DIGEST_LENGTH];
      69             : 
      70           3 :         switch(blk_verify_fingerprint(fingerprint, data, length))
      71             :         {
      72             :                 case 1: break; // Match.
      73             :                 case 0: return 0; // Did not match.
      74           0 :                 default: return -1;
      75             :         }
      76             : 
      77           2 :         if(md5_generation(md5sum_new, data, length))
      78             :                 return -1;
      79           2 :         if(!memcmp(md5sum_new, md5sum, MD5_DIGEST_LENGTH))
      80             :                 return 1;
      81             : 
      82           1 :         return 0;
      83             : }
      84             : 
      85             : #define HOOK_MASK       0xF000000000000000ULL
      86             : 
      87       39777 : int blk_fingerprint_is_hook(struct blk *blk)
      88             : {
      89       39777 :         return (blk->fingerprint&HOOK_MASK)==HOOK_MASK;
      90             : }
      91             : 
      92             : #define ETOH    le64toh
      93             : #define HTOE    htole64
      94             : // Can set it the other way round to test that endian logic works, but for
      95             : // real use we will always be going host->little little->host.
      96             : //#define ETOH  be64toh
      97             : //#define HTOE  htobe64
      98             : 
      99             : static void set_fingerprint(struct blk *blk, struct iobuf *iobuf)
     100             : {
     101       77074 :         blk->fingerprint=ETOH(*(uint64_t *)iobuf->buf);
     102             : }
     103             : 
     104      151232 : static void set_sig(struct blk *blk, struct iobuf *iobuf)
     105             : {
     106      151232 :         set_fingerprint(blk, iobuf);
     107       75616 :         memcpy(blk->md5sum, iobuf->buf+8, 8);
     108       75616 :         memcpy(blk->md5sum+8, iobuf->buf+16, 8);
     109       75616 : }
     110             : 
     111             : static void set_savepath(struct blk *blk, struct iobuf *iobuf, size_t offset)
     112             : {
     113       58373 :         blk->savepath=ETOH(*(uint64_t *)(iobuf->buf+offset));
     114             : }
     115             : 
     116       29155 : int blk_set_from_iobuf_sig(struct blk *blk, struct iobuf *iobuf)
     117             : {
     118       29155 :         if(iobuf->len!=24)
     119             :         {
     120           1 :                 logp("Signature wrong length: %lu!=24\n",
     121             :                         (unsigned long)iobuf->len);
     122           1 :                 return -1;
     123             :         }
     124       29154 :         set_sig(blk, iobuf);
     125       29154 :         return 0;
     126             : }
     127             : 
     128       92925 : int blk_set_from_iobuf_sig_and_savepath(struct blk *blk, struct iobuf *iobuf)
     129             : {
     130       46463 :         if(iobuf->len!=32)
     131             :         {
     132           1 :                 logp("Signature with save_path wrong length: %lu!=32\n",
     133             :                         (unsigned long)iobuf->len);
     134           1 :                 return -1;
     135             :         }
     136       46462 :         set_sig(blk, iobuf);
     137       92924 :         set_savepath(blk, iobuf, 24 /* offset */);
     138       46462 :         return 0;
     139             : }
     140             : 
     141        2917 : int blk_set_from_iobuf_fingerprint(struct blk *blk, struct iobuf *iobuf)
     142             : {
     143        1459 :         if(iobuf->len!=sizeof(blk->fingerprint))
     144             :         {
     145           1 :                 logp("Fingerprint wrong length: %lu!=%lu\n",
     146             :                         (unsigned long)iobuf->len,
     147             :                         (unsigned long)sizeof(blk->fingerprint));
     148           1 :                 return -1;
     149             :         }
     150        2916 :         set_fingerprint(blk, iobuf);
     151        1458 :         return 0;
     152             : }
     153             : 
     154       23823 : int blk_set_from_iobuf_savepath(struct blk *blk, struct iobuf *iobuf)
     155             : {
     156       11912 :         if(iobuf->len!=sizeof(blk->savepath))
     157             :         {
     158           1 :                 logp("Save path wrong length: %lu!=%lu\n",
     159             :                         (unsigned long)iobuf->len,
     160             :                         (unsigned long)sizeof(blk->savepath));
     161           1 :                 return -1;
     162             :         }
     163       23822 :         set_savepath(blk, iobuf, 0 /* offset */);
     164       11911 :         return 0;
     165             : }
     166             : 
     167       12525 : int blk_set_from_iobuf_index_and_savepath(struct blk *blk, struct iobuf *iobuf)
     168             : {
     169       12525 :         if(iobuf->len!=16)
     170             :         {
     171           1 :                 logp("File number and savepath with wrong length: %lu!=16\n",
     172             :                         (unsigned long)iobuf->len);
     173           1 :                 return -1;
     174             :         }
     175       12524 :         blk->index=ETOH(*(uint64_t *)iobuf->buf);
     176       12524 :         blk->savepath=ETOH(*(uint64_t *)(iobuf->buf+8));
     177       12524 :         return 0;
     178             : }
     179             : 
     180       12535 : int blk_set_from_iobuf_wrap_up(struct blk *blk, struct iobuf *iobuf)
     181             : {
     182       12535 :         if(iobuf->len!=sizeof(blk->index))
     183             :         {
     184           1 :                 logp("Wrap up with wrong length: %lu!=%lu\n",
     185             :                         (unsigned long)iobuf->len,
     186             :                         (unsigned long)sizeof(blk->index));
     187           1 :                 return -1;
     188             :         }
     189       12534 :         blk->index=ETOH(*(uint64_t *)iobuf->buf);
     190       12534 :         return 0;
     191             : }
     192             : 
     193       67687 : void blk_to_iobuf_sig(struct blk *blk, struct iobuf *iobuf)
     194             : {
     195             :         static union { char c[24]; uint64_t v[3]; } buf;
     196       67687 :         buf.v[0]=HTOE(blk->fingerprint);
     197       67687 :         memcpy(&buf.c[8], blk->md5sum, 8);
     198       67687 :         memcpy(&buf.c[16], blk->md5sum+8, 8);
     199       67687 :         iobuf_set(iobuf, CMD_SIG, buf.c, sizeof(buf));
     200       67687 : }
     201             : 
     202      187793 : void blk_to_iobuf_sig_and_savepath(struct blk *blk, struct iobuf *iobuf)
     203             : {
     204             :         static union { char c[32]; uint64_t v[4]; } buf;
     205      187793 :         buf.v[0]=HTOE(blk->fingerprint);
     206      187793 :         memcpy(&buf.c[8], blk->md5sum, 8);
     207      187793 :         memcpy(&buf.c[16], blk->md5sum+8, 8);
     208      187793 :         buf.v[3]=HTOE(blk->savepath);
     209      187793 :         iobuf_set(iobuf, CMD_SIG, buf.c, sizeof(buf));
     210      187793 : }
     211             : 
     212             : static void to_iobuf_uint64(struct iobuf *iobuf, enum cmd cmd, uint64_t val)
     213             : {
     214             :         static union { char c[8]; uint64_t v; } buf;
     215       50762 :         buf.v=HTOE(val);
     216       50762 :         iobuf_set(iobuf, cmd, buf.c, sizeof(buf));
     217             : }
     218             : 
     219           0 : void blk_to_iobuf_fingerprint(struct blk *blk, struct iobuf *iobuf)
     220             : {
     221           0 :         to_iobuf_uint64(iobuf, CMD_FINGERPRINT, blk->fingerprint);
     222           0 : }
     223             : 
     224       35289 : void blk_to_iobuf_savepath(struct blk *blk, struct iobuf *iobuf)
     225             : {
     226       35289 :         to_iobuf_uint64(iobuf, CMD_SAVE_PATH, blk->savepath);
     227       35289 : }
     228             : 
     229       12524 : void blk_to_iobuf_index_and_savepath(struct blk *blk, struct iobuf *iobuf)
     230             : {
     231             :         static union { char c[16]; uint64_t v[2]; } buf;
     232       12524 :         buf.v[0]=HTOE(blk->index);
     233       12524 :         buf.v[1]=HTOE(blk->savepath);
     234       12524 :         iobuf_set(iobuf, CMD_SIG, buf.c, sizeof(buf));
     235       12524 : }
     236             : 
     237       12534 : void blk_to_iobuf_wrap_up(struct blk *blk, struct iobuf *iobuf)
     238             : {
     239       12534 :         to_iobuf_uint64(iobuf, CMD_WRAP_UP, blk->index);
     240       12534 : }
     241             : 
     242        2939 : int to_fzp_fingerprint(struct fzp *fzp, uint64_t fingerprint)
     243             : {
     244             :         static struct iobuf wbuf;
     245             :         to_iobuf_uint64(&wbuf, CMD_FINGERPRINT, fingerprint);
     246        2939 :         return iobuf_send_msg_fzp(&wbuf, fzp);
     247             : }

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