| 1 | #include "xmail.h" |
| 2 | #include "sys/types.h" |
| 3 | #include "pwd.h" |
| 4 | #include "sys/stat.h" |
| 5 | #include "sys/dir.h" |
| 6 | extern int errno; |
| 7 | struct stat stbuf; |
| 8 | int uid, destuid; |
| 9 | char *myname, *dest, *keyfile[128], line[128]; |
| 10 | struct direct dbuf; |
| 11 | char *maildir = "/usr/spool/secretmail/"; |
| 12 | FILE *kf, *mf, *df; |
| 13 | MINT *a[42], *cd[6][128]; |
| 14 | MINT *msg; |
| 15 | char buf[256], eof; |
| 16 | int dbg; |
| 17 | main(argc, argv) char **argv; |
| 18 | { int i, nmax, len; |
| 19 | char *p; |
| 20 | long now; |
| 21 | if(argc != 2) |
| 22 | xfatal("mail to exactly one person"); |
| 23 | uid = getuid(); |
| 24 | p =getlogin(); |
| 25 | if(p == NULL) |
| 26 | p = getpwuid(uid)->pw_name; |
| 27 | myname = malloc(strlen(p)+1); |
| 28 | strcpy(myname, p); |
| 29 | dest = argv[1]; |
| 30 | strcpy(keyfile, maildir); |
| 31 | strcat(keyfile, dest); |
| 32 | strcat(keyfile, ".key"); |
| 33 | if(stat(keyfile, &stbuf) <0) |
| 34 | xfatal("addressee not enrolled"); |
| 35 | destuid = getpwnam(dest)->pw_uid; |
| 36 | if(destuid != stbuf.st_uid) |
| 37 | fprintf(stderr, "warning: addressee's key file may be subverted\n"); |
| 38 | errno = 0; |
| 39 | kf = fopen(keyfile, "r"); |
| 40 | if(kf == NULL) |
| 41 | xfatal("addressee's key weird"); |
| 42 | df = fopen(maildir, "r"); |
| 43 | if(df == NULL) |
| 44 | { perror(maildir); |
| 45 | exit(1); |
| 46 | } |
| 47 | strcpy(line, dest); |
| 48 | strcat(line, ".%d"); |
| 49 | nmax = -1; |
| 50 | for(; !feof(df);) |
| 51 | { fread(&dbuf, sizeof(dbuf), 1, df); |
| 52 | if(dbuf.d_ino == 0) continue; |
| 53 | if(sscanf(dbuf.d_name, line, &i) != 1) |
| 54 | continue; |
| 55 | if(i>nmax) nmax = i; |
| 56 | } |
| 57 | nmax ++; |
| 58 | for(i=0; i<10; i++) |
| 59 | { sprintf(line, "%s%s.%d", maildir, dest, nmax+i); |
| 60 | if(creat(line, 0666) >= 0) break; |
| 61 | } |
| 62 | if(i==10) xfatal("cannot create mail file"); |
| 63 | mf = fopen(line, "w"); |
| 64 | init(); |
| 65 | time(&now); |
| 66 | sprintf(buf, "From %s %s", myname, ctime(&now) ); |
| 67 | #ifdef DBG |
| 68 | dbg = 1; |
| 69 | #endif |
| 70 | run(); |
| 71 | sprintf(buf, "mail %s <%snotice", dest, maildir); |
| 72 | system(buf); |
| 73 | exit(0); |
| 74 | } |
| 75 | mkcd() |
| 76 | { int i, j, k, n; |
| 77 | for(i=0; i<42; i++) |
| 78 | nin(a[i], kf); |
| 79 | fclose(kf); |
| 80 | for(i=0; i<6; i++) |
| 81 | for(j=0; j<128; j++) |
| 82 | for(k=j, n=0; k>0 && n<7; n++, k>>=1) |
| 83 | if(k&01) madd(cd[i][j], a[7*i+n], cd[i][j]); |
| 84 | } |
| 85 | encipher(s) char s[6]; |
| 86 | { int i; |
| 87 | msub(msg, msg, msg); |
| 88 | for(i=0; i<6; i++) |
| 89 | madd(msg, cd[i][s[i]&0177], msg); |
| 90 | } |
| 91 | init() |
| 92 | { int i, j; |
| 93 | msg = itom(0); |
| 94 | for(i=0; i<42; i++) |
| 95 | a[i] = itom(0); |
| 96 | for(i=0; i<6; i++) |
| 97 | for(j=0; j<128; j++) |
| 98 | cd[i][j] = itom(0); |
| 99 | mkcd(); |
| 100 | } |
| 101 | run() |
| 102 | { char *p; |
| 103 | int i, len, eof = 0; |
| 104 | for(;;) |
| 105 | { len = strlen(buf); |
| 106 | for(i=0; i<len/6; i++) |
| 107 | { |
| 108 | encipher(buf+6*i); |
| 109 | nout(msg, mf); |
| 110 | } |
| 111 | p = buf; |
| 112 | for(i *= 6; i<len; i++) |
| 113 | *p++ = buf[i]; |
| 114 | if(eof) return; |
| 115 | fgets(p, sizeof(buf)-6, stdin); |
| 116 | if(strcmp(p, ".\n") == 0 || feof(stdin)) |
| 117 | { for(i=0; i<6; i++) *p++ = ' '; |
| 118 | *p = 0; |
| 119 | eof = 1; |
| 120 | } |
| 121 | } |
| 122 | } |