Commit | Line | Data |
---|---|---|
2117e02e MW |
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 | } |