Contents of /trunk/mkinitrd-magellan/busybox/mailutils/mail.c
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Revision 816 -
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Fri Apr 24 18:33:46 2009 UTC (15 years, 5 months ago) by niro
File MIME type: text/plain
File size: 5298 byte(s)
Fri Apr 24 18:33:46 2009 UTC (15 years, 5 months ago) by niro
File MIME type: text/plain
File size: 5298 byte(s)
-updated to busybox-1.13.4
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * helper routines |
4 | * |
5 | * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com> |
6 | * |
7 | * Licensed under GPLv2, see file LICENSE in this tarball for details. |
8 | */ |
9 | #include "libbb.h" |
10 | #include "mail.h" |
11 | |
12 | static void kill_helper(void) |
13 | { |
14 | // TODO!!!: is there more elegant way to terminate child on program failure? |
15 | if (G.helper_pid > 0) |
16 | kill(G.helper_pid, SIGTERM); |
17 | } |
18 | |
19 | // generic signal handler |
20 | static void signal_handler(int signo) |
21 | { |
22 | #define err signo |
23 | if (SIGALRM == signo) { |
24 | kill_helper(); |
25 | bb_error_msg_and_die("timed out"); |
26 | } |
27 | |
28 | // SIGCHLD. reap zombies |
29 | if (safe_waitpid(G.helper_pid, &err, WNOHANG) > 0) |
30 | if (WIFEXITED(err)) { |
31 | G.helper_pid = 0; |
32 | if (WEXITSTATUS(err)) |
33 | bb_error_msg_and_die("child exited (%d)", WEXITSTATUS(err)); |
34 | } |
35 | #undef err |
36 | } |
37 | |
38 | void FAST_FUNC launch_helper(const char **argv) |
39 | { |
40 | // setup vanilla unidirectional pipes interchange |
41 | int idx; |
42 | int pipes[4]; |
43 | |
44 | xpipe(pipes); |
45 | xpipe(pipes+2); |
46 | G.helper_pid = vfork(); |
47 | if (G.helper_pid < 0) |
48 | bb_perror_msg_and_die("vfork"); |
49 | idx = (!G.helper_pid) * 2; |
50 | xdup2(pipes[idx], STDIN_FILENO); |
51 | xdup2(pipes[3-idx], STDOUT_FILENO); |
52 | if (ENABLE_FEATURE_CLEAN_UP) |
53 | for (int i = 4; --i >= 0; ) |
54 | if (pipes[i] > STDOUT_FILENO) |
55 | close(pipes[i]); |
56 | if (!G.helper_pid) { |
57 | // child: try to execute connection helper |
58 | BB_EXECVP(*argv, (char **)argv); |
59 | _exit(127); |
60 | } |
61 | // parent: check whether child is alive |
62 | bb_signals(0 |
63 | + (1 << SIGCHLD) |
64 | + (1 << SIGALRM) |
65 | , signal_handler); |
66 | signal_handler(SIGCHLD); |
67 | // child seems OK -> parent goes on |
68 | atexit(kill_helper); |
69 | } |
70 | |
71 | const FAST_FUNC char *command(const char *fmt, const char *param) |
72 | { |
73 | const char *msg = fmt; |
74 | if (timeout) |
75 | alarm(timeout); |
76 | if (msg) { |
77 | msg = xasprintf(fmt, param); |
78 | printf("%s\r\n", msg); |
79 | } |
80 | fflush(stdout); |
81 | return msg; |
82 | } |
83 | |
84 | // NB: parse_url can modify url[] (despite const), but only if '@' is there |
85 | /* |
86 | static char FAST_FUNC *parse_url(char *url, char **user, char **pass) |
87 | { |
88 | // parse [user[:pass]@]host |
89 | // return host |
90 | char *s = strchr(url, '@'); |
91 | *user = *pass = NULL; |
92 | if (s) { |
93 | *s++ = '\0'; |
94 | *user = url; |
95 | url = s; |
96 | s = strchr(*user, ':'); |
97 | if (s) { |
98 | *s++ = '\0'; |
99 | *pass = s; |
100 | } |
101 | } |
102 | return url; |
103 | } |
104 | */ |
105 | |
106 | void FAST_FUNC encode_base64(char *fname, const char *text, const char *eol) |
107 | { |
108 | enum { |
109 | SRC_BUF_SIZE = 45, /* This *MUST* be a multiple of 3 */ |
110 | DST_BUF_SIZE = 4 * ((SRC_BUF_SIZE + 2) / 3), |
111 | }; |
112 | |
113 | #define src_buf text |
114 | FILE *fp = fp; |
115 | ssize_t len = len; |
116 | char dst_buf[DST_BUF_SIZE + 1]; |
117 | |
118 | if (fname) { |
119 | fp = (NOT_LONE_DASH(fname)) ? xfopen_for_read(fname) : (FILE *)text; |
120 | src_buf = bb_common_bufsiz1; |
121 | // N.B. strlen(NULL) segfaults! |
122 | } else if (text) { |
123 | // though we do not call uuencode(NULL, NULL) explicitly |
124 | // still we do not want to break things suddenly |
125 | len = strlen(text); |
126 | } else |
127 | return; |
128 | |
129 | while (1) { |
130 | size_t size; |
131 | if (fname) { |
132 | size = fread((char *)src_buf, 1, SRC_BUF_SIZE, fp); |
133 | if ((ssize_t)size < 0) |
134 | bb_perror_msg_and_die(bb_msg_read_error); |
135 | } else { |
136 | size = len; |
137 | if (len > SRC_BUF_SIZE) |
138 | size = SRC_BUF_SIZE; |
139 | } |
140 | if (!size) |
141 | break; |
142 | // encode the buffer we just read in |
143 | bb_uuencode(dst_buf, src_buf, size, bb_uuenc_tbl_base64); |
144 | if (fname) { |
145 | printf("%s\n", eol); |
146 | } else { |
147 | src_buf += size; |
148 | len -= size; |
149 | } |
150 | fwrite(dst_buf, 1, 4 * ((size + 2) / 3), stdout); |
151 | } |
152 | if (fname && NOT_LONE_DASH(fname)) |
153 | fclose(fp); |
154 | #undef src_buf |
155 | } |
156 | |
157 | void FAST_FUNC decode_base64(FILE *src_stream, FILE *dst_stream) |
158 | { |
159 | int term_count = 1; |
160 | |
161 | while (1) { |
162 | char translated[4]; |
163 | int count = 0; |
164 | |
165 | while (count < 4) { |
166 | char *table_ptr; |
167 | int ch; |
168 | |
169 | /* Get next _valid_ character. |
170 | * global vector bb_uuenc_tbl_base64[] contains this string: |
171 | * "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n" |
172 | */ |
173 | do { |
174 | ch = fgetc(src_stream); |
175 | if (ch == EOF) { |
176 | bb_error_msg_and_die(bb_msg_read_error); |
177 | } |
178 | // - means end of MIME section |
179 | if ('-' == ch) { |
180 | // push it back |
181 | ungetc(ch, src_stream); |
182 | return; |
183 | } |
184 | table_ptr = strchr(bb_uuenc_tbl_base64, ch); |
185 | } while (table_ptr == NULL); |
186 | |
187 | /* Convert encoded character to decimal */ |
188 | ch = table_ptr - bb_uuenc_tbl_base64; |
189 | |
190 | if (*table_ptr == '=') { |
191 | if (term_count == 0) { |
192 | translated[count] = '\0'; |
193 | break; |
194 | } |
195 | term_count++; |
196 | } else if (*table_ptr == '\n') { |
197 | /* Check for terminating line */ |
198 | if (term_count == 5) { |
199 | return; |
200 | } |
201 | term_count = 1; |
202 | continue; |
203 | } else { |
204 | translated[count] = ch; |
205 | count++; |
206 | term_count = 0; |
207 | } |
208 | } |
209 | |
210 | /* Merge 6 bit chars to 8 bit */ |
211 | if (count > 1) { |
212 | fputc(translated[0] << 2 | translated[1] >> 4, dst_stream); |
213 | } |
214 | if (count > 2) { |
215 | fputc(translated[1] << 4 | translated[2] >> 2, dst_stream); |
216 | } |
217 | if (count > 3) { |
218 | fputc(translated[2] << 6 | translated[3], dst_stream); |
219 | } |
220 | } |
221 | } |
222 | |
223 | |
224 | /* |
225 | * get username and password from a file descriptor |
226 | */ |
227 | void FAST_FUNC get_cred_or_die(int fd) |
228 | { |
229 | // either from TTY |
230 | if (isatty(fd)) { |
231 | G.user = xstrdup(bb_askpass(0, "User: ")); |
232 | G.pass = xstrdup(bb_askpass(0, "Password: ")); |
233 | // or from STDIN |
234 | } else { |
235 | FILE *fp = fdopen(fd, "r"); |
236 | G.user = xmalloc_fgetline(fp); |
237 | G.pass = xmalloc_fgetline(fp); |
238 | fclose(fp); |
239 | } |
240 | if (!G.user || !*G.user || !G.pass || !*G.pass) |
241 | bb_error_msg_and_die("no username or password"); |
242 | } |