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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