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- #include "xmail.h"
- #include "sys/types.h"
- #include "pwd.h"
- #include "sys/stat.h"
- #include "sys/dir.h"
- extern int errno;
- struct stat stbuf;
- int uid, destuid;
- char *myname, *dest, *keyfile[128], line[128];
- struct direct dbuf;
- char *maildir = "/usr/spool/secretmail/";
- FILE *kf, *mf, *df;
- MINT *a[42], *cd[6][128];
- MINT *msg;
- char buf[256], eof;
- int dbg;
- main(argc, argv) char **argv;
- { int i, nmax, len;
- char *p;
- long now;
- if(argc != 2)
- xfatal("mail to exactly one person");
- uid = getuid();
- p =getlogin();
- if(p == NULL)
- p = getpwuid(uid)->pw_name;
- myname = malloc(strlen(p)+1);
- strcpy(myname, p);
- dest = argv[1];
- strcpy(keyfile, maildir);
- strcat(keyfile, dest);
- strcat(keyfile, ".key");
- if(stat(keyfile, &stbuf) <0)
- xfatal("addressee not enrolled");
- destuid = getpwnam(dest)->pw_uid;
- if(destuid != stbuf.st_uid)
- fprintf(stderr, "warning: addressee's key file may be subverted\n");
- errno = 0;
- kf = fopen(keyfile, "r");
- if(kf == NULL)
- xfatal("addressee's key weird");
- df = fopen(maildir, "r");
- if(df == NULL)
- { perror(maildir);
- exit(1);
- }
- strcpy(line, dest);
- strcat(line, ".%d");
- nmax = -1;
- for(; !feof(df);)
- { fread(&dbuf, sizeof(dbuf), 1, df);
- if(dbuf.d_ino == 0) continue;
- if(sscanf(dbuf.d_name, line, &i) != 1)
- continue;
- if(i>nmax) nmax = i;
- }
- nmax ++;
- for(i=0; i<10; i++)
- { sprintf(line, "%s%s.%d", maildir, dest, nmax+i);
- if(creat(line, 0666) >= 0) break;
- }
- if(i==10) xfatal("cannot create mail file");
- mf = fopen(line, "w");
- init();
- time(&now);
- sprintf(buf, "From %s %s", myname, ctime(&now) );
- #ifdef DBG
- dbg = 1;
- #endif
- run();
- sprintf(buf, "mail %s <%snotice", dest, maildir);
- system(buf);
- exit(0);
- }
- mkcd()
- { int i, j, k, n;
- for(i=0; i<42; i++)
- nin(a[i], kf);
- fclose(kf);
- for(i=0; i<6; i++)
- for(j=0; j<128; j++)
- for(k=j, n=0; k>0 && n<7; n++, k>>=1)
- if(k&01) madd(cd[i][j], a[7*i+n], cd[i][j]);
- }
- encipher(s) char s[6];
- { int i;
- msub(msg, msg, msg);
- for(i=0; i<6; i++)
- madd(msg, cd[i][s[i]&0177], msg);
- }
- init()
- { int i, j;
- msg = itom(0);
- for(i=0; i<42; i++)
- a[i] = itom(0);
- for(i=0; i<6; i++)
- for(j=0; j<128; j++)
- cd[i][j] = itom(0);
- mkcd();
- }
- run()
- { char *p;
- int i, len, eof = 0;
- for(;;)
- { len = strlen(buf);
- for(i=0; i<len/6; i++)
- {
- encipher(buf+6*i);
- nout(msg, mf);
- }
- p = buf;
- for(i *= 6; i<len; i++)
- *p++ = buf[i];
- if(eof) return;
- fgets(p, sizeof(buf)-6, stdin);
- if(strcmp(p, ".\n") == 0 || feof(stdin))
- { for(i=0; i<6; i++) *p++ = ' ';
- *p = 0;
- eof = 1;
- }
- }
- }
-