[2725] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * helper routines
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| 4 | *
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| 5 | * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
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| 6 | *
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| 7 | * Licensed under GPLv2, see file LICENSE in this source tree.
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| 8 | */
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| 9 | #include "libbb.h"
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| 10 | #include "mail.h"
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| 11 |
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| 12 | static void kill_helper(void)
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| 13 | {
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| 14 | if (G.helper_pid > 0) {
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| 15 | kill(G.helper_pid, SIGTERM);
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| 16 | G.helper_pid = 0;
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| 17 | }
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| 18 | }
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| 19 |
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| 20 | // generic signal handler
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| 21 | static void signal_handler(int signo)
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| 22 | {
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| 23 | #define err signo
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| 24 | if (SIGALRM == signo) {
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| 25 | kill_helper();
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| 26 | bb_error_msg_and_die("timed out");
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| 27 | }
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| 28 |
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| 29 | // SIGCHLD. reap zombies
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| 30 | if (safe_waitpid(G.helper_pid, &err, WNOHANG) > 0) {
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| 31 | if (WIFSIGNALED(err))
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| 32 | bb_error_msg_and_die("helper killed by signal %u", WTERMSIG(err));
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| 33 | if (WIFEXITED(err)) {
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| 34 | G.helper_pid = 0;
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| 35 | if (WEXITSTATUS(err))
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| 36 | bb_error_msg_and_die("helper exited (%u)", WEXITSTATUS(err));
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| 37 | }
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| 38 | }
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| 39 | #undef err
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| 40 | }
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| 41 |
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| 42 | void FAST_FUNC launch_helper(const char **argv)
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| 43 | {
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| 44 | // setup vanilla unidirectional pipes interchange
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| 45 | int i;
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| 46 | int pipes[4];
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| 47 |
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| 48 | xpipe(pipes);
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| 49 | xpipe(pipes + 2);
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| 50 |
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| 51 | // NB: handler must be installed before vfork
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| 52 | bb_signals(0
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| 53 | + (1 << SIGCHLD)
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| 54 | + (1 << SIGALRM)
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| 55 | , signal_handler);
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| 56 |
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| 57 | G.helper_pid = xvfork();
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| 58 |
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| 59 | i = (!G.helper_pid) * 2; // for parent:0, for child:2
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| 60 | close(pipes[i + 1]); // 1 or 3 - closing one write end
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| 61 | close(pipes[2 - i]); // 2 or 0 - closing one read end
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| 62 | xmove_fd(pipes[i], STDIN_FILENO); // 0 or 2 - using other read end
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| 63 | xmove_fd(pipes[3 - i], STDOUT_FILENO); // 3 or 1 - other write end
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| 64 |
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| 65 | if (!G.helper_pid) {
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| 66 | // child: try to execute connection helper
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| 67 | // NB: SIGCHLD & SIGALRM revert to SIG_DFL on exec
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| 68 | BB_EXECVP_or_die((char**)argv);
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| 69 | }
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| 70 |
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| 71 | // parent
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| 72 | // check whether child is alive
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| 73 | //redundant:signal_handler(SIGCHLD);
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| 74 | // child seems OK -> parent goes on
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| 75 | atexit(kill_helper);
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| 76 | }
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| 77 |
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| 78 | const FAST_FUNC char *command(const char *fmt, const char *param)
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| 79 | {
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| 80 | const char *msg = fmt;
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| 81 | if (timeout)
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| 82 | alarm(timeout);
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| 83 | if (msg) {
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| 84 | msg = xasprintf(fmt, param);
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| 85 | printf("%s\r\n", msg);
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| 86 | }
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| 87 | fflush_all();
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| 88 | return msg;
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| 89 | }
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| 90 |
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| 91 | // NB: parse_url can modify url[] (despite const), but only if '@' is there
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| 92 | /*
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| 93 | static char FAST_FUNC *parse_url(char *url, char **user, char **pass)
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| 94 | {
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| 95 | // parse [user[:pass]@]host
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| 96 | // return host
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| 97 | char *s = strchr(url, '@');
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| 98 | *user = *pass = NULL;
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| 99 | if (s) {
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| 100 | *s++ = '\0';
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| 101 | *user = url;
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| 102 | url = s;
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| 103 | s = strchr(*user, ':');
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| 104 | if (s) {
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| 105 | *s++ = '\0';
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| 106 | *pass = s;
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| 107 | }
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| 108 | }
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| 109 | return url;
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| 110 | }
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| 111 | */
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| 112 |
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| 113 | void FAST_FUNC encode_base64(char *fname, const char *text, const char *eol)
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| 114 | {
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| 115 | enum {
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| 116 | SRC_BUF_SIZE = 45, /* This *MUST* be a multiple of 3 */
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| 117 | DST_BUF_SIZE = 4 * ((SRC_BUF_SIZE + 2) / 3),
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| 118 | };
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| 119 | #define src_buf text
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| 120 | char src[SRC_BUF_SIZE];
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| 121 | FILE *fp = fp;
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| 122 | ssize_t len = len;
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| 123 | char dst_buf[DST_BUF_SIZE + 1];
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| 124 |
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| 125 | if (fname) {
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| 126 | fp = (NOT_LONE_DASH(fname)) ? xfopen_for_read(fname) : (FILE *)text;
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| 127 | src_buf = src;
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| 128 | } else if (text) {
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| 129 | // though we do not call uuencode(NULL, NULL) explicitly
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| 130 | // still we do not want to break things suddenly
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| 131 | len = strlen(text);
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| 132 | } else
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| 133 | return;
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| 134 |
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| 135 | while (1) {
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| 136 | size_t size;
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| 137 | if (fname) {
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| 138 | size = fread((char *)src_buf, 1, SRC_BUF_SIZE, fp);
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| 139 | if ((ssize_t)size < 0)
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| 140 | bb_perror_msg_and_die(bb_msg_read_error);
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| 141 | } else {
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| 142 | size = len;
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| 143 | if (len > SRC_BUF_SIZE)
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| 144 | size = SRC_BUF_SIZE;
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| 145 | }
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| 146 | if (!size)
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| 147 | break;
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| 148 | // encode the buffer we just read in
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| 149 | bb_uuencode(dst_buf, src_buf, size, bb_uuenc_tbl_base64);
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| 150 | if (fname) {
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| 151 | printf("%s\n", eol);
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| 152 | } else {
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| 153 | src_buf += size;
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| 154 | len -= size;
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| 155 | }
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| 156 | fwrite(dst_buf, 1, 4 * ((size + 2) / 3), stdout);
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| 157 | }
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| 158 | if (fname && NOT_LONE_DASH(fname))
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| 159 | fclose(fp);
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| 160 | #undef src_buf
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| 161 | }
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| 162 |
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| 163 | /*
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| 164 | * get username and password from a file descriptor
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| 165 | */
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| 166 | void FAST_FUNC get_cred_or_die(int fd)
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| 167 | {
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| 168 | if (isatty(fd)) {
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| 169 | G.user = xstrdup(bb_ask(fd, /* timeout: */ 0, "User: "));
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| 170 | G.pass = xstrdup(bb_ask(fd, /* timeout: */ 0, "Password: "));
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| 171 | } else {
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| 172 | G.user = xmalloc_reads(fd, /* pfx: */ NULL, /* maxsize: */ NULL);
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| 173 | G.pass = xmalloc_reads(fd, /* pfx: */ NULL, /* maxsize: */ NULL);
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| 174 | }
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| 175 | if (!G.user || !*G.user || !G.pass)
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| 176 | bb_error_msg_and_die("no username or password");
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| 177 | }
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