LCOV - code coverage report
Current view: top level - src/server/protocol2 - dpth.c (source / functions) Hit Total Coverage
Test: burp-coverage-clean.info Lines: 116 125 92.8 %
Date: 2016-03-31 Functions: 13 13 100.0 %

          Line data    Source code
       1             : #include "../../burp.h"
       2             : #include "../../alloc.h"
       3             : #include "../../cmd.h"
       4             : #include "../../fsops.h"
       5             : #include "../../hexmap.h"
       6             : #include "../../iobuf.h"
       7             : #include "../../lock.h"
       8             : #include "../../log.h"
       9             : #include "../../prepend.h"
      10             : #include "../../protocol2/blk.h"
      11             : #include "dpth.h"
      12             : 
      13          11 : static int get_data_lock(struct lock *lock, struct dpth *dpth, const char *path)
      14             : {
      15          11 :         int ret=-1;
      16          11 :         char *p=NULL;
      17          11 :         char *lockfile=NULL;
      18             :         // Use just the first three components, excluding sig number.
      19          22 :         if(!(p=prepend_slash(dpth->base_path, path, 14))
      20          11 :           || !(lockfile=prepend(p, ".lock")))
      21             :                 goto end;
      22          22 :         if(lock_init(lock, lockfile)
      23          11 :           || build_path_w(lock->path))
      24             :                 goto end;
      25          11 :         lock_get_quick(lock);
      26          11 :         ret=0;
      27             : end:
      28          11 :         free_w(&p);
      29          11 :         free_w(&lockfile);
      30          11 :         return ret;
      31             : }
      32             : 
      33             : static char *dpth_mk_prim(struct dpth *dpth)
      34             : {
      35             :         static char path[8];
      36          38 :         snprintf(path, sizeof(path), "%04X", dpth->comp[0]);
      37             :         return path;
      38             : }
      39             : 
      40             : static char *dpth_mk_seco(struct dpth *dpth)
      41             : {
      42             :         static char path[16];
      43          38 :         snprintf(path, sizeof(path), "%04X/%04X", dpth->comp[0], dpth->comp[1]);
      44             :         return path;
      45             : }
      46             : 
      47          10 : static struct dpth_lock *dpth_lock_alloc(const char *save_path)
      48             : {
      49             :         struct dpth_lock *dpth_lock;
      50          10 :         if(!(dpth_lock=(struct dpth_lock *)
      51             :                 calloc_w(1, sizeof(struct dpth_lock), __func__)))
      52             :                         return NULL;
      53             :         snprintf(dpth_lock->save_path, sizeof(dpth_lock->save_path),
      54          10 :                 "%s", save_path);
      55          10 :         return dpth_lock;
      56             : }
      57             : 
      58          10 : static int add_lock_to_list(struct dpth *dpth,
      59             :         struct lock *lock, const char *save_path)
      60             : {
      61             :         struct dpth_lock *dlnew;
      62          10 :         if(!(dlnew=dpth_lock_alloc(save_path))) return -1;
      63          10 :         dlnew->lock=lock;
      64             : 
      65             :         // Add to the end of the list.
      66          10 :         if(dpth->tail) dpth->tail->next=dlnew;
      67           7 :         else if(!dpth->head) dpth->head=dlnew;
      68          10 :         dpth->tail=dlnew;
      69             :         return 0;
      70             : }
      71             : 
      72       12545 : char *dpth_protocol2_get_save_path(struct dpth *dpth)
      73             : {
      74             :         static char save_path[32];
      75             :         snprintf(save_path, sizeof(save_path), "%04X/%04X/%04X/%04X",
      76       12545 :                 dpth->comp[0], dpth->comp[1], dpth->comp[2], dpth->comp[3]);
      77       12545 :         return save_path;
      78             : }
      79             : 
      80       12548 : char *dpth_protocol2_mk(struct dpth *dpth)
      81             : {
      82             :         static char *save_path=NULL;
      83             :         static struct lock *lock=NULL;
      84             :         while(1)
      85             :         {
      86       12538 :                 save_path=dpth_protocol2_get_save_path(dpth);
      87       12538 :                 if(!dpth->need_data_lock) return save_path;
      88             : 
      89          11 :                 if(!lock && !(lock=lock_alloc())) goto error;
      90          22 :                 if(get_data_lock(lock, dpth, save_path)) goto error;
      91          11 :                 switch(lock->status)
      92             :                 {
      93             :                         case GET_LOCK_GOT: break;
      94             :                         case GET_LOCK_NOT_GOT:
      95             :                                 // Increment and try again.
      96           1 :                                 if(dpth_incr(dpth)) goto error;
      97             :                                 continue;
      98             :                         case GET_LOCK_ERROR:
      99             :                         default:
     100             :                                 goto error;
     101             :                 }
     102             : 
     103          10 :                 dpth->need_data_lock=0; // Got it.
     104          10 :                 if(add_lock_to_list(dpth, lock, save_path)) goto error;
     105          10 :                 lock=NULL;
     106          10 :                 return save_path;
     107             :         }
     108             : error:
     109           0 :         lock_free(&lock);
     110           0 :         return NULL;
     111             : }
     112             : 
     113             : // Returns 0 on OK, -1 on error. *max gets set to the next entry.
     114         150 : int get_highest_entry(const char *path, int *max, size_t len)
     115             : {
     116         150 :         int ent=0;
     117         150 :         int ret=0;
     118         150 :         DIR *d=NULL;
     119         150 :         struct dirent *dp=NULL;
     120             : 
     121         150 :         *max=-1;
     122         150 :         if(!(d=opendir(path))) goto end;
     123          97 :         while((dp=readdir(d)))
     124             :         {
     125          73 :                 if(!dp->d_ino
     126          73 :                   || strlen(dp->d_name)!=len)
     127             :                         continue;
     128          24 :                 ent=strtol(dp->d_name, NULL, 16);
     129          24 :                 if(ent>*max) *max=ent;
     130             :         }
     131             : 
     132             : end:
     133         150 :         if(d) closedir(d);
     134         150 :         return ret;
     135             : }
     136             : 
     137       16641 : int dpth_protocol2_incr_sig(struct dpth *dpth)
     138             : {
     139       16641 :         if(++dpth->comp[3]<DATA_FILE_SIG_MAX) return 0;
     140           9 :         dpth->comp[3]=0;
     141           9 :         dpth->need_data_lock=1;
     142           9 :         return dpth_incr(dpth);
     143             : }
     144             : 
     145         114 : int dpth_protocol2_init(struct dpth *dpth, const char *base_path,
     146             :         int max_storage_subdirs)
     147             : {
     148             :         int max;
     149          38 :         int ret=0;
     150          38 :         char *tmp=NULL;
     151             : 
     152          38 :         if(!base_path)
     153             :         {
     154           0 :                 logp("No base_path supplied in %s()\n", __func__);
     155           0 :                 goto error;
     156             :         }
     157             : 
     158          38 :         dpth->max_storage_subdirs=max_storage_subdirs;
     159             : 
     160          38 :         free_w(&dpth->base_path);
     161          38 :         if(!(dpth->base_path=strdup_w(base_path, __func__)))
     162             :                 goto error;
     163             : 
     164          38 :         dpth->savepath=0;
     165          38 :         dpth->need_data_lock=1;
     166             : 
     167          38 :         if(get_highest_entry(dpth->base_path, &max, 4))
     168             :                 goto error;
     169          38 :         if(max<0) max=0;
     170          38 :         dpth->comp[0]=max;
     171          76 :         tmp=dpth_mk_prim(dpth);
     172          38 :         if(!(tmp=prepend_s(dpth->base_path, tmp)))
     173             :                 goto error;
     174             : 
     175          38 :         if(get_highest_entry(tmp, &max, 4))
     176             :                 goto error;
     177          38 :         if(max<0) max=0;
     178          38 :         dpth->comp[1]=max;
     179          38 :         free_w(&tmp);
     180         114 :         tmp=dpth_mk_seco(dpth);
     181          38 :         if(!(tmp=prepend_s(dpth->base_path, tmp)))
     182             :                 goto error;
     183             : 
     184          38 :         if(get_highest_entry(tmp, &max, 4))
     185             :                 goto error;
     186          38 :         if(max<0)
     187             :         {
     188          30 :                 dpth->comp[2]=0;
     189             :         }
     190             :         else
     191             :         {
     192           8 :                 dpth->comp[2]=max;
     193           8 :                 if(dpth_incr(dpth)) goto error;
     194             :         }
     195             : 
     196             :         goto end;
     197             : error:
     198             :         ret=-1;
     199             : end:
     200          38 :         free_w(&tmp);
     201          38 :         return ret;
     202             : }
     203             : 
     204       16630 : static int fprint_tag(struct fzp *fzp, enum cmd cmd, unsigned int s)
     205             : {
     206       16630 :         if(fzp_printf(fzp, "%c%04X", cmd, s)!=5)
     207             :         {
     208           0 :                 logp("Short fprintf\n");
     209           0 :                 return -1;
     210             :         }
     211             :         return 0;
     212             : }
     213             : 
     214       16630 : static int fwrite_buf(enum cmd cmd,
     215             :         const char *buf, unsigned int s, struct fzp *fzp)
     216             : {
     217             :         static size_t bytes;
     218       16630 :         if(fprint_tag(fzp, cmd, s)) return -1;
     219       16630 :         if((bytes=fzp_write(fzp, buf, s))!=s)
     220             :         {
     221           0 :                 logp("Short write: %d\n", (int)bytes);
     222           0 :                 return -1;
     223             :         }
     224             :         return 0;
     225             : }
     226             : 
     227           9 : static struct fzp *file_open_w(const char *path, const char *mode)
     228             : {
     229           9 :         if(build_path_w(path)) return NULL;
     230           9 :         return fzp_open(path, "wb");
     231             : }
     232             : 
     233           9 : static struct fzp *open_data_file_for_write(struct dpth *dpth, struct blk *blk)
     234             : {
     235           9 :         char *path=NULL;
     236           9 :         struct fzp *fzp=NULL;
     237           9 :         char *savepathstr=NULL;
     238           9 :         struct dpth_lock *head=dpth->head;
     239             : 
     240           9 :         savepathstr=uint64_to_savepathstr(blk->savepath);
     241             : 
     242             :         // Sanity check. They should be coming through from the client
     243             :         // in the same order in which we locked them.
     244             :         // Remember that the save_path on the lock list is shorter than the
     245             :         // full save_path on the blk.
     246           9 :         if(!head
     247           9 :           || strncmp(head->save_path,
     248             :                 //FIX THIS
     249           9 :                 savepathstr, sizeof(head->save_path)-1))
     250             :         {
     251             :                 logp("lock and block save_path mismatch: %s %s\n",
     252           0 :                         head?head->save_path:"(null)", savepathstr);
     253             :                 goto end;
     254             :         }
     255             : 
     256           9 :         if(!(path=prepend_slash(dpth->base_path, savepathstr, 14)))
     257             :                 goto end;
     258           9 :         fzp=file_open_w(path, "wb");
     259             : end:
     260           9 :         free_w(&path);
     261           9 :         return fzp;
     262             : }
     263             : 
     264       16639 : int dpth_protocol2_fwrite(struct dpth *dpth,
     265           9 :         struct iobuf *iobuf, struct blk *blk)
     266             : {
     267             :         // Remember that the save_path on the lock list is shorter than the
     268             :         // full save_path on the blk.
     269       16630 :         if(dpth->fzp
     270       16623 :           && strncmp(dpth->head->save_path,
     271       16623 :                 uint64_to_savepathstr(blk->savepath),
     272       16623 :                 sizeof(dpth->head->save_path)-1)
     273       16632 :           && dpth_release_and_move_to_next_in_list(dpth))
     274             :                 return -1;
     275             : 
     276             :         // Open the current list head if we have no fzp.
     277       33260 :         if(!dpth->fzp
     278       16648 :           && !(dpth->fzp=open_data_file_for_write(dpth, blk))) return -1;
     279             : 
     280       16630 :         return fwrite_buf(CMD_DATA, iobuf->buf, iobuf->len, dpth->fzp);
     281             : }

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