| 1 | #include <sys/types.h> |
| 2 | #include <sys/stat.h> |
| 3 | #include "fd.h" |
| 4 | #include "sig.h" |
| 5 | #include "getln.h" |
| 6 | #include "stralloc.h" |
| 7 | #include "substdio.h" |
| 8 | #include "subfd.h" |
| 9 | #include "alloc.h" |
| 10 | #include "datetime.h" |
| 11 | #include "error.h" |
| 12 | #include "wait.h" |
| 13 | #include "str.h" |
| 14 | #include "now.h" |
| 15 | #include "fmt.h" |
| 16 | #include "exit.h" |
| 17 | #include "readwrite.h" |
| 18 | |
| 19 | int timeout = 1200; |
| 20 | |
| 21 | int timeoutread(fd,buf,n) int fd; char *buf; int n; |
| 22 | { |
| 23 | int r; int saveerrno; |
| 24 | alarm(timeout); |
| 25 | r = read(fd,buf,n); saveerrno = errno; |
| 26 | alarm(0); |
| 27 | errno = saveerrno; return r; |
| 28 | } |
| 29 | |
| 30 | char ssinbuf[128]; |
| 31 | substdio ssin = SUBSTDIO_FDBUF(timeoutread,0,ssinbuf,sizeof(ssinbuf)); |
| 32 | |
| 33 | |
| 34 | void die() { _exit(1); } |
| 35 | void out(s) char *s; |
| 36 | { |
| 37 | if (substdio_puts(subfdoutsmall,s) == -1) die(); |
| 38 | } |
| 39 | void outflush(s) char *s; |
| 40 | { |
| 41 | out(s); |
| 42 | if (substdio_flush(subfdoutsmall) == -1) die(); |
| 43 | } |
| 44 | void err(s) char *s; |
| 45 | { |
| 46 | if (substdio_puts(subfdoutsmall,"-ERR ") == -1) die(); |
| 47 | if (substdio_puts(subfdoutsmall,s) == -1) die(); |
| 48 | if (substdio_puts(subfdoutsmall,"\r\n") == -1) die(); |
| 49 | if (substdio_flush(subfdoutsmall) == -1) die(); |
| 50 | } |
| 51 | void die_usage() { err("usage: popup hostname subprogram"); die(); } |
| 52 | void die_nomem() { err("out of memory"); die(); } |
| 53 | void die_pipe() { err("unable to open pipe"); die(); } |
| 54 | void die_write() { err("unable to write pipe"); die(); } |
| 55 | void die_fork() { err("unable to fork"); die(); } |
| 56 | void die_childcrashed() { err("aack, child crashed"); } |
| 57 | void die_badauth() { err("authorization failed"); } |
| 58 | |
| 59 | void err_syntax() { err("syntax error"); } |
| 60 | void err_wantuser() { err("USER first"); } |
| 61 | void err_authoriz() { err("authorization first"); } |
| 62 | |
| 63 | void okay() { outflush("+OK \r\n"); } |
| 64 | |
| 65 | |
| 66 | char unique[FMT_ULONG + FMT_ULONG + 3]; |
| 67 | char *hostname; |
| 68 | stralloc username = {0}; |
| 69 | int seenuser = 0; |
| 70 | char **childargs; |
| 71 | substdio ssup; |
| 72 | char upbuf[128]; |
| 73 | |
| 74 | |
| 75 | void doanddie(user,userlen,pass) |
| 76 | char *user; |
| 77 | unsigned int userlen; /* including 0 byte */ |
| 78 | char *pass; |
| 79 | { |
| 80 | int child; |
| 81 | int wstat; |
| 82 | int pi[2]; |
| 83 | int i; |
| 84 | |
| 85 | if (fd_copy(2,1) == -1) die_pipe(); |
| 86 | close(3); |
| 87 | if (pipe(pi) == -1) die_pipe(); |
| 88 | if (pi[0] != 3) die_pipe(); |
| 89 | switch(child = fork()) |
| 90 | { |
| 91 | case -1: |
| 92 | die_fork(); |
| 93 | case 0: |
| 94 | close(pi[1]); |
| 95 | sig_pipedefault(); |
| 96 | execvp(*childargs,childargs); |
| 97 | _exit(1); |
| 98 | } |
| 99 | close(pi[0]); |
| 100 | substdio_fdbuf(&ssup,write,pi[1],upbuf,sizeof(upbuf)); |
| 101 | if (substdio_put(&ssup,user,userlen) == -1) die_write(); |
| 102 | if (substdio_put(&ssup,pass,str_len(pass) + 1) == -1) die_write(); |
| 103 | if (substdio_puts(&ssup,"<") == -1) die_write(); |
| 104 | if (substdio_puts(&ssup,unique) == -1) die_write(); |
| 105 | if (substdio_puts(&ssup,hostname) == -1) die_write(); |
| 106 | if (substdio_put(&ssup,">",2) == -1) die_write(); |
| 107 | if (substdio_flush(&ssup) == -1) die_write(); |
| 108 | close(pi[1]); |
| 109 | for (i = 0;pass[i];++i) pass[i] = 0; |
| 110 | for (i = 0;i < sizeof(upbuf);++i) upbuf[i] = 0; |
| 111 | if (wait_pid(&wstat,child) == -1) die(); |
| 112 | if (wait_crashed(wstat)) die_childcrashed(); |
| 113 | if (wait_exitcode(wstat)) die_badauth(); |
| 114 | die(); |
| 115 | } |
| 116 | void pop3_greet() |
| 117 | { |
| 118 | char *s; |
| 119 | s = unique; |
| 120 | s += fmt_uint(s,getpid()); |
| 121 | *s++ = '.'; |
| 122 | s += fmt_ulong(s,(unsigned long) now()); |
| 123 | *s++ = '@'; |
| 124 | *s++ = 0; |
| 125 | |
| 126 | out("+OK <"); |
| 127 | out(unique); |
| 128 | out(hostname); |
| 129 | outflush(">\r\n"); |
| 130 | } |
| 131 | void pop3_user(arg) char *arg; |
| 132 | { |
| 133 | if (!arg) { err_syntax(); return; } |
| 134 | okay(); |
| 135 | seenuser = 1; |
| 136 | if (!stralloc_copys(&username,arg)) die_nomem(); |
| 137 | if (!stralloc_0(&username)) die_nomem(); |
| 138 | } |
| 139 | void pop3_pass(arg) char *arg; |
| 140 | { |
| 141 | if (!seenuser) { err_wantuser(); return; } |
| 142 | if (!arg) { err_syntax(); return; } |
| 143 | doanddie(username.s,username.len,arg); |
| 144 | } |
| 145 | void pop3_apop(arg) char *arg; |
| 146 | { |
| 147 | char *space; |
| 148 | if (!arg) { err_syntax(); return; } |
| 149 | space = arg + str_chr(arg,' '); |
| 150 | if (!*space) { err_syntax(); return; } |
| 151 | *space++ = 0; |
| 152 | doanddie(arg,space - arg,space); |
| 153 | } |
| 154 | |
| 155 | void pop3_quit() { okay(); die(); } |
| 156 | |
| 157 | static struct { void (*fun)(); char *text; } pop3cmd[] = { |
| 158 | { pop3_user, "user" } |
| 159 | , { pop3_pass, "pass" } |
| 160 | , { pop3_apop, "apop" } |
| 161 | , { pop3_quit, "quit" } |
| 162 | , { okay, "noop" } |
| 163 | , { 0, 0 } |
| 164 | }; |
| 165 | |
| 166 | void doit(cmd) |
| 167 | char *cmd; |
| 168 | { |
| 169 | int i; |
| 170 | int j; |
| 171 | char ch; |
| 172 | |
| 173 | for (i = 0;pop3cmd[i].fun;++i) |
| 174 | { |
| 175 | for (j = 0;ch = pop3cmd[i].text[j];++j) |
| 176 | if ((cmd[j] != ch) && (cmd[j] != ch - 32)) |
| 177 | break; |
| 178 | if (!ch) |
| 179 | if (!cmd[j] || (cmd[j] == ' ')) |
| 180 | { |
| 181 | while (cmd[j] == ' ') ++j; |
| 182 | if (!cmd[j]) |
| 183 | pop3cmd[i].fun((char *) 0); |
| 184 | else |
| 185 | pop3cmd[i].fun(cmd + j); |
| 186 | return; |
| 187 | } |
| 188 | } |
| 189 | err_authoriz(); |
| 190 | } |
| 191 | |
| 192 | void main(argc,argv) |
| 193 | int argc; |
| 194 | char **argv; |
| 195 | { |
| 196 | static stralloc cmd = {0}; |
| 197 | int match; |
| 198 | |
| 199 | sig_alarmcatch(die); |
| 200 | sig_pipeignore(); |
| 201 | |
| 202 | hostname = argv[1]; |
| 203 | if (!hostname) die_usage(); |
| 204 | childargs = argv + 2; |
| 205 | if (!*childargs) die_usage(); |
| 206 | |
| 207 | pop3_greet(); |
| 208 | |
| 209 | for (;;) |
| 210 | { |
| 211 | if (getln(&ssin,&cmd,&match,'\n') == -1) die(); |
| 212 | if (!match) die(); |
| 213 | if (cmd.len == 0) die(); |
| 214 | if (cmd.s[--cmd.len] != '\n') die(); |
| 215 | if ((cmd.len > 0) && (cmd.s[cmd.len - 1] == '\r')) --cmd.len; |
| 216 | cmd.s[cmd.len++] = 0; |
| 217 | doit(cmd.s); |
| 218 | } |
| 219 | } |