| 1 | #include "commands.h" |
| 2 | #include "fd.h" |
| 3 | #include "sig.h" |
| 4 | #include "stralloc.h" |
| 5 | #include "substdio.h" |
| 6 | #include "alloc.h" |
| 7 | #include "wait.h" |
| 8 | #include "str.h" |
| 9 | #include "byte.h" |
| 10 | #include "now.h" |
| 11 | #include "fmt.h" |
| 12 | #include "exit.h" |
| 13 | #include "readwrite.h" |
| 14 | #include "timeoutread.h" |
| 15 | #include "timeoutwrite.h" |
| 16 | |
| 17 | void die() { _exit(1); } |
| 18 | |
| 19 | int saferead(fd,buf,len) int fd; char *buf; int len; |
| 20 | { |
| 21 | int r; |
| 22 | r = timeoutread(1200,fd,buf,len); |
| 23 | if (r <= 0) die(); |
| 24 | return r; |
| 25 | } |
| 26 | |
| 27 | int safewrite(fd,buf,len) int fd; char *buf; int len; |
| 28 | { |
| 29 | int r; |
| 30 | r = timeoutwrite(1200,fd,buf,len); |
| 31 | if (r <= 0) die(); |
| 32 | return r; |
| 33 | } |
| 34 | |
| 35 | char ssoutbuf[128]; |
| 36 | substdio ssout = SUBSTDIO_FDBUF(safewrite,1,ssoutbuf,sizeof ssoutbuf); |
| 37 | |
| 38 | char ssinbuf[128]; |
| 39 | substdio ssin = SUBSTDIO_FDBUF(saferead,0,ssinbuf,sizeof ssinbuf); |
| 40 | |
| 41 | void puts(s) char *s; |
| 42 | { |
| 43 | substdio_puts(&ssout,s); |
| 44 | } |
| 45 | void flush() |
| 46 | { |
| 47 | substdio_flush(&ssout); |
| 48 | } |
| 49 | void err(s) char *s; |
| 50 | { |
| 51 | puts("-ERR "); |
| 52 | puts(s); |
| 53 | puts("\r\n"); |
| 54 | flush(); |
| 55 | } |
| 56 | |
| 57 | void die_usage() { err("usage: popup hostname subprogram"); die(); } |
| 58 | void die_nomem() { err("out of memory"); die(); } |
| 59 | void die_pipe() { err("unable to open pipe"); die(); } |
| 60 | void die_write() { err("unable to write pipe"); die(); } |
| 61 | void die_fork() { err("unable to fork"); die(); } |
| 62 | void die_childcrashed() { err("aack, child crashed"); } |
| 63 | void die_badauth() { err("authorization failed"); } |
| 64 | |
| 65 | void err_syntax() { err("syntax error"); } |
| 66 | void err_wantuser() { err("USER first"); } |
| 67 | void err_authoriz() { err("authorization first"); } |
| 68 | |
| 69 | void okay() { puts("+OK \r\n"); flush(); } |
| 70 | void pop3_quit() { okay(); die(); } |
| 71 | |
| 72 | |
| 73 | char unique[FMT_ULONG + FMT_ULONG + 3]; |
| 74 | char *hostname; |
| 75 | stralloc username = {0}; |
| 76 | int seenuser = 0; |
| 77 | char **childargs; |
| 78 | substdio ssup; |
| 79 | char upbuf[128]; |
| 80 | |
| 81 | |
| 82 | void doanddie(user,userlen,pass) |
| 83 | char *user; |
| 84 | unsigned int userlen; /* including 0 byte */ |
| 85 | char *pass; |
| 86 | { |
| 87 | int child; |
| 88 | int wstat; |
| 89 | int pi[2]; |
| 90 | |
| 91 | if (fd_copy(2,1) == -1) die_pipe(); |
| 92 | close(3); |
| 93 | if (pipe(pi) == -1) die_pipe(); |
| 94 | if (pi[0] != 3) die_pipe(); |
| 95 | switch(child = fork()) { |
| 96 | case -1: |
| 97 | die_fork(); |
| 98 | case 0: |
| 99 | close(pi[1]); |
| 100 | sig_pipedefault(); |
| 101 | execvp(*childargs,childargs); |
| 102 | _exit(1); |
| 103 | } |
| 104 | close(pi[0]); |
| 105 | substdio_fdbuf(&ssup,write,pi[1],upbuf,sizeof upbuf); |
| 106 | if (substdio_put(&ssup,user,userlen) == -1) die_write(); |
| 107 | if (substdio_put(&ssup,pass,str_len(pass) + 1) == -1) die_write(); |
| 108 | if (substdio_puts(&ssup,"<") == -1) die_write(); |
| 109 | if (substdio_puts(&ssup,unique) == -1) die_write(); |
| 110 | if (substdio_puts(&ssup,hostname) == -1) die_write(); |
| 111 | if (substdio_put(&ssup,">",2) == -1) die_write(); |
| 112 | if (substdio_flush(&ssup) == -1) die_write(); |
| 113 | close(pi[1]); |
| 114 | byte_zero(pass,str_len(pass)); |
| 115 | byte_zero(upbuf,sizeof upbuf); |
| 116 | if (wait_pid(&wstat,child) == -1) die(); |
| 117 | if (wait_crashed(wstat)) die_childcrashed(); |
| 118 | if (wait_exitcode(wstat)) die_badauth(); |
| 119 | die(); |
| 120 | } |
| 121 | void pop3_greet() |
| 122 | { |
| 123 | char *s; |
| 124 | s = unique; |
| 125 | s += fmt_uint(s,getpid()); |
| 126 | *s++ = '.'; |
| 127 | s += fmt_ulong(s,(unsigned long) now()); |
| 128 | *s++ = '@'; |
| 129 | *s++ = 0; |
| 130 | puts("+OK <"); |
| 131 | puts(unique); |
| 132 | puts(hostname); |
| 133 | puts(">\r\n"); |
| 134 | flush(); |
| 135 | } |
| 136 | void pop3_user(arg) char *arg; |
| 137 | { |
| 138 | if (!*arg) { err_syntax(); return; } |
| 139 | okay(); |
| 140 | seenuser = 1; |
| 141 | if (!stralloc_copys(&username,arg)) die_nomem(); |
| 142 | if (!stralloc_0(&username)) die_nomem(); |
| 143 | } |
| 144 | void pop3_pass(arg) char *arg; |
| 145 | { |
| 146 | if (!seenuser) { err_wantuser(); return; } |
| 147 | if (!*arg) { err_syntax(); return; } |
| 148 | doanddie(username.s,username.len,arg); |
| 149 | } |
| 150 | void pop3_apop(arg) char *arg; |
| 151 | { |
| 152 | char *space; |
| 153 | space = arg + str_chr(arg,' '); |
| 154 | if (!*space) { err_syntax(); return; } |
| 155 | *space++ = 0; |
| 156 | doanddie(arg,space - arg,space); |
| 157 | } |
| 158 | |
| 159 | struct commands pop3commands[] = { |
| 160 | { "user", pop3_user, 0 } |
| 161 | , { "pass", pop3_pass, 0 } |
| 162 | , { "apop", pop3_apop, 0 } |
| 163 | , { "quit", pop3_quit, 0 } |
| 164 | , { "noop", okay, 0 } |
| 165 | , { 0, err_authoriz, 0 } |
| 166 | } ; |
| 167 | |
| 168 | void main(argc,argv) |
| 169 | int argc; |
| 170 | char **argv; |
| 171 | { |
| 172 | sig_alarmcatch(die); |
| 173 | sig_pipeignore(); |
| 174 | |
| 175 | hostname = argv[1]; |
| 176 | if (!hostname) die_usage(); |
| 177 | childargs = argv + 2; |
| 178 | if (!*childargs) die_usage(); |
| 179 | |
| 180 | pop3_greet(); |
| 181 | commands(&ssin,pop3commands); |
| 182 | die(); |
| 183 | } |