libnpauth/p9any.c

   1
   2 #include <stdio.h>
   3 #include <string.h>
   4 #include <errno.h>
   5 #include "npfs.h"
   6 #include "npclient.h"
   7 #include "npauth.h"
   8
   9 #include "npaimpl.h"
  10
  11 #ifdef _WIN32
  12 #define EPROTONOSUPPORT 93 // XXX
  13 #endif
  14
  15 struct authproto {
  16         char *name;
  17         int (*auth)(Npcfid *fid, Npuser *user, void *aux);
  18 };
  19
  20 static struct authproto authprotos[] = {
  21         { "p9sk1", authp9sk1 },
  22         { 0, 0 },
  23 };
  24
  25 int
  26 srvp9any(struct npsrvauth *a, char *msg, int len, char *resp, int resplen)
  27 {
  28         char *proto, *dom;
  29         int r;
  30
  31         switch(a->state) {
  32         case 0:
  33                 if(len != 0
  34                 || resplen < strlen(a->dom) + 32)
  35                         return err("internal error", EINVAL);
  36                 sprintf(resp, "v.2 p9sk1@%s", a->dom);
  37                 a->state++;
  38                 return strlen(resp) + 1;
  39
  40         case 1:
  41                 if(len == 0
  42                 || msg[len-1] != '\0'
  43                 || strlen(msg) != len-1
  44                 || getWord(&msg, ' ', &proto) == -1
  45                 || getWord(&msg, 0, &dom) == -1
  46                 || strcmp(dom, a->dom) != 0)
  47                         return err("botch", EINVAL);
  48                 if(strcmp(proto, "p9sk1") != 0)
  49                         return err("unsupported", EPROTONOSUPPORT);
  50                 if(resplen < 32)
  51                         return err("internal error", EINVAL);
  52                 strcpy(resp, "OK");
  53                 a->state++;
  54                 return strlen(resp) + 1;
  55
  56         default:
  57                 a->state -= 1; // map state [2..] to [1..] (skip state 0)
  58                 r = srvp9sk1(a, msg, len, resp, resplen);
  59                 a->state += 1;
  60                 return r;
  61         }
  62 }
  63
  64
  65 int
  66 authp9any(Npcfid *afid, Npuser *user, void *aux)
  67 {
  68         char buf[128], *p, *word, *proto, *dom;
  69         int (*found)(Npcfid *afid, Npuser *user, void *aux);
  70         int v2, i;
  71
  72         if(getline0(afid, buf, sizeof buf) <= 0)
  73                 return err("botch", EINVAL);
  74
  75         p = buf;
  76         found = 0;
  77         v2 = 0;
  78         if(strncmp(p, "v.2 ", 4) == 0) {
  79                 v2 = 1;
  80                 p += 4;
  81         }
  82         while(*p && !found) {
  83                 if(getWord(&p, ' ', &word) == -1
  84                 || getWord(&word, '@', &proto) == -1
  85                 || getWord(&word, 0, &dom) == -1)
  86                         return err("botch", EINVAL);
  87                 for(i = 0; authprotos[i].name; i++) {
  88                         if(strcmp(authprotos[i].name, "p9sk1") == 0) {
  89                                 found = authprotos[i].auth;
  90                                 break;
  91                         }
  92                 }
  93         }
  94         if(!found)
  95                 return err("unsupported", EPROTONOSUPPORT);
  96
  97         if(putline0(afid, "%s %s", proto, dom) <= 0)
  98                 return err("botch", EINVAL);
  99
 100         if(v2) {
 101                 if(getline0(afid, buf, sizeof buf) <= 0)
 102                         return err("botch", EINVAL);
 103                 if(strcmp(buf, "OK") != 0)
 104                         return err("botch", EINVAL);
 105         }
 106         return found(afid, user, aux);
 107 }
 108