Denis Vlasenko | 239d06b | 2008-11-06 23:42:42 +0000 | [diff] [blame] | 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 | { |
Denis Vlasenko | 021de3f | 2009-03-04 17:56:00 +0000 | [diff] [blame] | 14 | if (G.helper_pid > 0) { |
Denis Vlasenko | 239d06b | 2008-11-06 23:42:42 +0000 | [diff] [blame] | 15 | kill(G.helper_pid, SIGTERM); |
Denis Vlasenko | 021de3f | 2009-03-04 17:56:00 +0000 | [diff] [blame] | 16 | G.helper_pid = 0; |
| 17 | } |
Denis Vlasenko | 239d06b | 2008-11-06 23:42:42 +0000 | [diff] [blame] | 18 | } |
| 19 | |
| 20 | // generic signal handler |
| 21 | static void signal_handler(int signo) |
| 22 | { |
| 23 | #define err signo |
| 24 | if (SIGALRM == signo) { |
| 25 | kill_helper(); |
| 26 | bb_error_msg_and_die("timed out"); |
| 27 | } |
| 28 | |
| 29 | // SIGCHLD. reap zombies |
Denis Vlasenko | 021de3f | 2009-03-04 17:56:00 +0000 | [diff] [blame] | 30 | if (safe_waitpid(G.helper_pid, &err, WNOHANG) > 0) { |
| 31 | if (WIFSIGNALED(err)) |
| 32 | bb_error_msg_and_die("helper killed by signal %u", WTERMSIG(err)); |
Denis Vlasenko | 239d06b | 2008-11-06 23:42:42 +0000 | [diff] [blame] | 33 | if (WIFEXITED(err)) { |
| 34 | G.helper_pid = 0; |
| 35 | if (WEXITSTATUS(err)) |
Denis Vlasenko | 021de3f | 2009-03-04 17:56:00 +0000 | [diff] [blame] | 36 | bb_error_msg_and_die("helper exited (%u)", WEXITSTATUS(err)); |
Denis Vlasenko | 239d06b | 2008-11-06 23:42:42 +0000 | [diff] [blame] | 37 | } |
Denis Vlasenko | 021de3f | 2009-03-04 17:56:00 +0000 | [diff] [blame] | 38 | } |
Denis Vlasenko | 239d06b | 2008-11-06 23:42:42 +0000 | [diff] [blame] | 39 | #undef err |
| 40 | } |
| 41 | |
| 42 | void FAST_FUNC launch_helper(const char **argv) |
| 43 | { |
| 44 | // setup vanilla unidirectional pipes interchange |
Denis Vlasenko | 021de3f | 2009-03-04 17:56:00 +0000 | [diff] [blame] | 45 | int i; |
Denis Vlasenko | 239d06b | 2008-11-06 23:42:42 +0000 | [diff] [blame] | 46 | int pipes[4]; |
| 47 | |
| 48 | xpipe(pipes); |
Denis Vlasenko | 021de3f | 2009-03-04 17:56:00 +0000 | [diff] [blame] | 49 | xpipe(pipes + 2); |
| 50 | |
Denis Vlasenko | 4774179 | 2009-03-10 16:01:57 +0000 | [diff] [blame] | 51 | // NB: handler must be installed before vfork |
| 52 | bb_signals(0 |
| 53 | + (1 << SIGCHLD) |
| 54 | + (1 << SIGALRM) |
| 55 | , signal_handler); |
| 56 | |
Denis Vlasenko | 239d06b | 2008-11-06 23:42:42 +0000 | [diff] [blame] | 57 | G.helper_pid = vfork(); |
| 58 | if (G.helper_pid < 0) |
| 59 | bb_perror_msg_and_die("vfork"); |
Denis Vlasenko | 021de3f | 2009-03-04 17:56:00 +0000 | [diff] [blame] | 60 | |
| 61 | i = (!G.helper_pid) * 2; // for parent:0, for child:2 |
| 62 | close(pipes[i + 1]); // 1 or 3 - closing one write end |
| 63 | close(pipes[2 - i]); // 2 or 0 - closing one read end |
| 64 | xmove_fd(pipes[i], STDIN_FILENO); // 0 or 2 - using other read end |
| 65 | xmove_fd(pipes[3 - i], STDOUT_FILENO); // 3 or 1 - other write end |
| 66 | |
Denis Vlasenko | 239d06b | 2008-11-06 23:42:42 +0000 | [diff] [blame] | 67 | if (!G.helper_pid) { |
| 68 | // child: try to execute connection helper |
Denis Vlasenko | 4774179 | 2009-03-10 16:01:57 +0000 | [diff] [blame] | 69 | // NB: SIGCHLD & SIGALRM revert to SIG_DFL on exec |
Denis Vlasenko | 239d06b | 2008-11-06 23:42:42 +0000 | [diff] [blame] | 70 | BB_EXECVP(*argv, (char **)argv); |
| 71 | _exit(127); |
| 72 | } |
Denis Vlasenko | 021de3f | 2009-03-04 17:56:00 +0000 | [diff] [blame] | 73 | |
| 74 | // parent |
Denis Vlasenko | 021de3f | 2009-03-04 17:56:00 +0000 | [diff] [blame] | 75 | // check whether child is alive |
| 76 | //redundant:signal_handler(SIGCHLD); |
Denis Vlasenko | 239d06b | 2008-11-06 23:42:42 +0000 | [diff] [blame] | 77 | // child seems OK -> parent goes on |
| 78 | atexit(kill_helper); |
| 79 | } |
| 80 | |
| 81 | const FAST_FUNC char *command(const char *fmt, const char *param) |
| 82 | { |
| 83 | const char *msg = fmt; |
| 84 | if (timeout) |
| 85 | alarm(timeout); |
| 86 | if (msg) { |
| 87 | msg = xasprintf(fmt, param); |
| 88 | printf("%s\r\n", msg); |
| 89 | } |
| 90 | fflush(stdout); |
| 91 | return msg; |
| 92 | } |
| 93 | |
| 94 | // NB: parse_url can modify url[] (despite const), but only if '@' is there |
| 95 | /* |
| 96 | static char FAST_FUNC *parse_url(char *url, char **user, char **pass) |
| 97 | { |
| 98 | // parse [user[:pass]@]host |
| 99 | // return host |
| 100 | char *s = strchr(url, '@'); |
| 101 | *user = *pass = NULL; |
| 102 | if (s) { |
| 103 | *s++ = '\0'; |
| 104 | *user = url; |
| 105 | url = s; |
| 106 | s = strchr(*user, ':'); |
| 107 | if (s) { |
| 108 | *s++ = '\0'; |
| 109 | *pass = s; |
| 110 | } |
| 111 | } |
| 112 | return url; |
| 113 | } |
| 114 | */ |
| 115 | |
| 116 | void FAST_FUNC encode_base64(char *fname, const char *text, const char *eol) |
| 117 | { |
| 118 | enum { |
| 119 | SRC_BUF_SIZE = 45, /* This *MUST* be a multiple of 3 */ |
| 120 | DST_BUF_SIZE = 4 * ((SRC_BUF_SIZE + 2) / 3), |
| 121 | }; |
| 122 | |
| 123 | #define src_buf text |
| 124 | FILE *fp = fp; |
| 125 | ssize_t len = len; |
| 126 | char dst_buf[DST_BUF_SIZE + 1]; |
| 127 | |
| 128 | if (fname) { |
| 129 | fp = (NOT_LONE_DASH(fname)) ? xfopen_for_read(fname) : (FILE *)text; |
| 130 | src_buf = bb_common_bufsiz1; |
| 131 | // N.B. strlen(NULL) segfaults! |
| 132 | } else if (text) { |
| 133 | // though we do not call uuencode(NULL, NULL) explicitly |
| 134 | // still we do not want to break things suddenly |
| 135 | len = strlen(text); |
| 136 | } else |
| 137 | return; |
| 138 | |
| 139 | while (1) { |
| 140 | size_t size; |
| 141 | if (fname) { |
| 142 | size = fread((char *)src_buf, 1, SRC_BUF_SIZE, fp); |
| 143 | if ((ssize_t)size < 0) |
| 144 | bb_perror_msg_and_die(bb_msg_read_error); |
| 145 | } else { |
| 146 | size = len; |
| 147 | if (len > SRC_BUF_SIZE) |
| 148 | size = SRC_BUF_SIZE; |
| 149 | } |
| 150 | if (!size) |
| 151 | break; |
| 152 | // encode the buffer we just read in |
| 153 | bb_uuencode(dst_buf, src_buf, size, bb_uuenc_tbl_base64); |
| 154 | if (fname) { |
| 155 | printf("%s\n", eol); |
| 156 | } else { |
| 157 | src_buf += size; |
| 158 | len -= size; |
| 159 | } |
| 160 | fwrite(dst_buf, 1, 4 * ((size + 2) / 3), stdout); |
| 161 | } |
| 162 | if (fname && NOT_LONE_DASH(fname)) |
| 163 | fclose(fp); |
| 164 | #undef src_buf |
| 165 | } |
| 166 | |
| 167 | void FAST_FUNC decode_base64(FILE *src_stream, FILE *dst_stream) |
| 168 | { |
| 169 | int term_count = 1; |
| 170 | |
| 171 | while (1) { |
| 172 | char translated[4]; |
| 173 | int count = 0; |
| 174 | |
| 175 | while (count < 4) { |
| 176 | char *table_ptr; |
| 177 | int ch; |
| 178 | |
| 179 | /* Get next _valid_ character. |
| 180 | * global vector bb_uuenc_tbl_base64[] contains this string: |
| 181 | * "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n" |
| 182 | */ |
| 183 | do { |
| 184 | ch = fgetc(src_stream); |
| 185 | if (ch == EOF) { |
| 186 | bb_error_msg_and_die(bb_msg_read_error); |
| 187 | } |
| 188 | // - means end of MIME section |
| 189 | if ('-' == ch) { |
| 190 | // push it back |
| 191 | ungetc(ch, src_stream); |
| 192 | return; |
| 193 | } |
| 194 | table_ptr = strchr(bb_uuenc_tbl_base64, ch); |
| 195 | } while (table_ptr == NULL); |
| 196 | |
| 197 | /* Convert encoded character to decimal */ |
| 198 | ch = table_ptr - bb_uuenc_tbl_base64; |
| 199 | |
| 200 | if (*table_ptr == '=') { |
| 201 | if (term_count == 0) { |
| 202 | translated[count] = '\0'; |
| 203 | break; |
| 204 | } |
| 205 | term_count++; |
| 206 | } else if (*table_ptr == '\n') { |
| 207 | /* Check for terminating line */ |
| 208 | if (term_count == 5) { |
| 209 | return; |
| 210 | } |
| 211 | term_count = 1; |
| 212 | continue; |
| 213 | } else { |
| 214 | translated[count] = ch; |
| 215 | count++; |
| 216 | term_count = 0; |
| 217 | } |
| 218 | } |
| 219 | |
| 220 | /* Merge 6 bit chars to 8 bit */ |
| 221 | if (count > 1) { |
| 222 | fputc(translated[0] << 2 | translated[1] >> 4, dst_stream); |
| 223 | } |
| 224 | if (count > 2) { |
| 225 | fputc(translated[1] << 4 | translated[2] >> 2, dst_stream); |
| 226 | } |
| 227 | if (count > 3) { |
| 228 | fputc(translated[2] << 6 | translated[3], dst_stream); |
| 229 | } |
| 230 | } |
| 231 | } |
| 232 | |
| 233 | |
| 234 | /* |
| 235 | * get username and password from a file descriptor |
| 236 | */ |
| 237 | void FAST_FUNC get_cred_or_die(int fd) |
| 238 | { |
Denis Vlasenko | 239d06b | 2008-11-06 23:42:42 +0000 | [diff] [blame] | 239 | if (isatty(fd)) { |
Denis Vlasenko | 021de3f | 2009-03-04 17:56:00 +0000 | [diff] [blame] | 240 | G.user = xstrdup(bb_ask(fd, /* timeout: */ 0, "User: ")); |
| 241 | G.pass = xstrdup(bb_ask(fd, /* timeout: */ 0, "Password: ")); |
Denis Vlasenko | 239d06b | 2008-11-06 23:42:42 +0000 | [diff] [blame] | 242 | } else { |
Denis Vlasenko | 021de3f | 2009-03-04 17:56:00 +0000 | [diff] [blame] | 243 | G.user = xmalloc_reads(fd, /* pfx: */ NULL, /* maxsize: */ NULL); |
| 244 | G.pass = xmalloc_reads(fd, /* pfx: */ NULL, /* maxsize: */ NULL); |
Denis Vlasenko | 239d06b | 2008-11-06 23:42:42 +0000 | [diff] [blame] | 245 | } |
Denis Vlasenko | 021de3f | 2009-03-04 17:56:00 +0000 | [diff] [blame] | 246 | if (!G.user || !*G.user || !G.pass) |
Denis Vlasenko | 239d06b | 2008-11-06 23:42:42 +0000 | [diff] [blame] | 247 | bb_error_msg_and_die("no username or password"); |
| 248 | } |