/[pkg-mixmaster]/trunk/Mix/Src/chain1.c
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revision 262 by rabbi, Wed Sep 18 23:26:17 2002 UTC revision 710 by rabbi, Wed Jan 21 00:47:21 2004 UTC
# Line 1  Line 1 
1  /* Mixmaster version 3  --  (C) 1999 Anonymizer Inc.  /* Mixmaster version 3.0  --  (C) 1999 - 2004 Anonymizer Inc. and others.
2    
3     Mixmaster may be redistributed and modified under certain conditions.     Mixmaster may be redistributed and modified under certain conditions.
4     This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF     This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF
# Line 6  Line 6 
6     details.     details.
7    
8     Encrypt message for Cypherpunk remailer chain     Encrypt message for Cypherpunk remailer chain
9     $Id: chain1.c,v 1.3 2002/09/18 23:26:16 rabbi Exp $ */     $Id$ */
10    
11    
12  #include "mix3.h"  #include "mix3.h"
# Line 16  Line 16 
16    
17  #define N(X) (isdigit(X) ? (X)-'0' : 0)  #define N(X) (isdigit(X) ? (X)-'0' : 0)
18    
19  int t1_rlist(REMAILER remailer[])  int t1_rlist(REMAILER remailer[], int badchains[MAXREM][MAXREM])
20  {  {
21    FILE *list;    FILE *list, *excl;
22    int i, listed = 0;    int i, listed = 0;
23    int n = 0;    int n = 0;
24    char line[2 * LINELEN], l2[LINELEN], name[LINELEN], *flags;    char line[2 * LINELEN], l2[LINELEN], name[LINELEN], *flags;
25      BUFFER *starex;
26    
27      starex = buf_new();
28      excl = mix_openfile(STAREX, "r");
29      if (excl != NULL) {
30        buf_read(starex, excl);
31        fclose(excl);
32      }
33    
34    list = mix_openfile(TYPE1LIST, "r");    list = mix_openfile(TYPE1LIST, "r");
35    if (list == NULL)    if (list == NULL) {
36        buf_free(starex);
37      return (-1);      return (-1);
38      }
39    
40    while (fgets(line, sizeof(line), list) != NULL && n < MAXREM) {    while (fgets(line, sizeof(line), list) != NULL && n < MAXREM) {
41      if (strleft(line, "$remailer") &&      if (strleft(line, "$remailer") &&
42          strchr(line, '<') && strchr(line, '>') &&          strchr(line, '<') && strchr(line, '>') &&
# Line 71  int t1_rlist(REMAILER remailer[]) Line 82  int t1_rlist(REMAILER remailer[])
82        remailer[i].info[1].reliability = 0;        remailer[i].info[1].reliability = 0;
83        remailer[i].info[1].latency = 0;        remailer[i].info[1].latency = 0;
84        remailer[i].info[1].history[0] = '\0';        remailer[i].info[1].history[0] = '\0';
85      }        remailer[i].flags.star_ex = bufifind(starex, name);
86       }
87      if (strleft(line,      if (strleft(line,
88                  "-----------------------------------------------------------------------"))                  "-----------------------------------------------------------------------"))
89        break;        break;
# Line 95  int t1_rlist(REMAILER remailer[]) Line 107  int t1_rlist(REMAILER remailer[])
107          }          }
108    }    }
109    fclose(list);    fclose(list);
110      parse_badchains(badchains, TYPE1LIST, "Broken type-I remailer chains", remailer, n);
111    if (listed < 4)               /* we have no valid reliability info */    if (listed < 4)               /* we have no valid reliability info */
112      for (i = 1; i < n; i++)      for (i = 1; i < n; i++)
113        remailer[i].info[1].reliability = 10000;        remailer[i].info[1].reliability = 10000;
# Line 102  int t1_rlist(REMAILER remailer[]) Line 115  int t1_rlist(REMAILER remailer[])
115  #ifdef USE_PGP  #ifdef USE_PGP
116    pgp_rlist(remailer, n);    pgp_rlist(remailer, n);
117  #endif /* USE_PGP */  #endif /* USE_PGP */
118      buf_free(starex);
119    return (n);    return (n);
120  }  }
121    
# Line 116  int t1_ek(BUFFER *key, BUFFER *seed, int Line 130  int t1_ek(BUFFER *key, BUFFER *seed, int
130    fprintf(stderr, "passphrase=%s (%2X%2X%2X%2X %d)\n", key->data,    fprintf(stderr, "passphrase=%s (%2X%2X%2X%2X %d)\n", key->data,
131            seed->data[0], seed->data[1], seed->data[2], seed->data[3], num);            seed->data[0], seed->data[1], seed->data[2], seed->data[3], num);
132  #endif /* DEBUG */  #endif /* DEBUG */
133    return (0);    return (0);
134  }  }
135    
136  int t1_encrypt(int type, BUFFER *message, char *chainstr, int latency,  int t1_encrypt(int type, BUFFER *message, char *chainstr, int latency,
# Line 124  int t1_encrypt(int type, BUFFER *message Line 138  int t1_encrypt(int type, BUFFER *message
138  {  {
139    BUFFER *b, *rem, *dest, *line, *field, *content;    BUFFER *b, *rem, *dest, *line, *field, *content;
140    REMAILER remailer[MAXREM];    REMAILER remailer[MAXREM];
141      int badchains[MAXREM][MAXREM];
142    int maxrem, chainlen = 0;    int maxrem, chainlen = 0;
143    int chain[20];    int chain[20];
144    int hop;    int hop;
# Line 137  int t1_encrypt(int type, BUFFER *message Line 152  int t1_encrypt(int type, BUFFER *message
152    field = buf_new();    field = buf_new();
153    content = buf_new();    content = buf_new();
154    
155    maxrem = t1_rlist(remailer);    maxrem = t1_rlist(remailer, badchains);
156    if (maxrem < 1) {    if (maxrem < 1) {
157      clienterr(feedback, "No remailer list!");      clienterr(feedback, "No remailer list!");
158      err = -1;      err = -1;
# Line 153  int t1_encrypt(int type, BUFFER *message Line 168  int t1_encrypt(int type, BUFFER *message
168      goto end;      goto end;
169    }    }
170    if (chain[0] == 0)    if (chain[0] == 0)
171      chain[0] = chain_randfinal(type, remailer, maxrem, 1);      chain[0] = chain_randfinal(type, remailer, badchains, maxrem, 1, chain, chainlen, 0);
172    
173    if (chain[0] == -1) {    if (chain[0] == -1) {
174      clienterr(feedback, "Invalid remailer chain!");      clienterr(feedback, "Invalid remailer chain!");
175      err = -1;      err = -1;
176      goto end;      goto end;
177    }    }
178    if (chain_rand(remailer, maxrem, chain, chainlen, 1) == -1) {    if (chain_rand(remailer, badchains, maxrem, chain, chainlen, 1, 0) == -1) {
179      clienterr(feedback, "No reliable remailers!");      clienterr(feedback, "No reliable remailers!");
180      err = -1;      err = -1;
181      goto end;      goto end;
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