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/* vi: set sw=4 ts=4: */
/*
* helper routines
*
* Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
*
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
#include <sys/prctl.h>
#include "libbb.h"
#include "mail.h"
// generic signal handler
static void signal_handler(int signo)
{
#define err signo
if (SIGALRM == signo) {
bb_simple_error_msg_and_die("timed out");
}
// SIGCHLD. reap zombies
if (safe_waitpid(G.helper_pid, &err, WNOHANG) > 0) {
if (WIFSIGNALED(err))
bb_error_msg_and_die("helper killed by signal %u", WTERMSIG(err));
if (WIFEXITED(err)) {
G.helper_pid = 0;
if (WEXITSTATUS(err))
bb_error_msg_and_die("helper exited (%u)", WEXITSTATUS(err));
}
}
#undef err
}
void FAST_FUNC launch_helper(const char **argv)
{
// setup vanilla unidirectional pipes interchange
int i;
int pipes[4];
xpipe(pipes);
xpipe(pipes + 2);
// NB: handler must be installed before vfork
bb_signals(0
+ (1 << SIGCHLD)
+ (1 << SIGALRM)
, signal_handler);
G.helper_pid = xvfork();
i = (!G.helper_pid) * 2; // for parent:0, for child:2
close(pipes[i + 1]); // 1 or 3 - closing one write end
close(pipes[2 - i]); // 2 or 0 - closing one read end
xmove_fd(pipes[i], STDIN_FILENO); // 0 or 2 - using other read end
xmove_fd(pipes[3 - i], STDOUT_FILENO); // 3 or 1 - using other write end
// End result:
// parent stdout [3] -> child stdin [2]
// child stdout [1] -> parent stdin [0]
if (!G.helper_pid) {
// child
// if parent dies, get SIGTERM
prctl(PR_SET_PDEATHSIG, SIGTERM, 0, 0, 0);
// try to execute connection helper
// NB: SIGCHLD & SIGALRM revert to SIG_DFL on exec
BB_EXECVP_or_die((char**)argv);
}
// parent goes on
}
char* FAST_FUNC send_mail_command(const char *fmt, const char *param)
{
char *msg;
if (G.timeout)
alarm(G.timeout);
msg = (char*)fmt;
if (fmt) {
msg = xasprintf(fmt, param);
if (G.verbose)
bb_error_msg("send:'%s'", msg);
printf("%s\r\n", msg);
}
fflush_all();
return msg;
}
// NB: parse_url can modify url[] (despite const), but only if '@' is there
/*
static char* FAST_FUNC parse_url(char *url, char **user, char **pass)
{
// parse [user[:pass]@]host
// return host
char *s = strchr(url, '@');
*user = *pass = NULL;
if (s) {
*s++ = '\0';
*user = url;
url = s;
s = strchr(*user, ':');
if (s) {
*s++ = '\0';
*pass = s;
}
}
return url;
}
*/
static void encode_n_base64(const char *fname, const char *text, size_t len)
{
enum {
SRC_BUF_SIZE = 57, /* This *MUST* be a multiple of 3 */
DST_BUF_SIZE = 4 * ((SRC_BUF_SIZE + 2) / 3),
};
#define src_buf text
char src[SRC_BUF_SIZE];
FILE *fp = fp;
char dst_buf[DST_BUF_SIZE + 1];
if (fname) {
fp = (NOT_LONE_DASH(fname)) ? xfopen_for_read(fname) : stdin;
src_buf = src;
}
while (1) {
size_t size;
if (fname) {
size = fread((char *)src_buf, 1, SRC_BUF_SIZE, fp);
if ((ssize_t)size < 0)
bb_simple_perror_msg_and_die(bb_msg_read_error);
} else {
size = len;
if (len > SRC_BUF_SIZE)
size = SRC_BUF_SIZE;
}
if (!size)
break;
// encode the buffer we just read in
bb_uuencode(dst_buf, src_buf, size, bb_uuenc_tbl_base64);
if (fname) {
puts("");
} else {
src_buf += size;
len -= size;
}
fwrite(dst_buf, 1, 4 * ((size + 2) / 3), stdout);
}
if (fname && NOT_LONE_DASH(fname))
fclose(fp);
#undef src_buf
}
void FAST_FUNC printstr_base64(const char *text)
{
encode_n_base64(NULL, text, strlen(text));
}
void FAST_FUNC printbuf_base64(const char *text, unsigned len)
{
encode_n_base64(NULL, text, len);
}
void FAST_FUNC printfile_base64(const char *fname)
{
encode_n_base64(fname, NULL, 0);
}
/*
* get username and password from a file descriptor
*/
void FAST_FUNC get_cred_or_die(int fd)
{
if (isatty(fd)) {
G.user = bb_ask_noecho(fd, /* timeout: */ 0, "User: ");
G.pass = bb_ask_noecho(fd, /* timeout: */ 0, "Password: ");
} else {
G.user = xmalloc_reads(fd, /* maxsize: */ NULL);
G.pass = xmalloc_reads(fd, /* maxsize: */ NULL);
}
if (!G.user || !*G.user || !G.pass)
bb_simple_error_msg_and_die("no username or password");
}
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