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authorGravatar Denis Vlasenko <vda.linux@googlemail.com>2008-11-06 23:42:42 +0000
committerGravatar Denis Vlasenko <vda.linux@googlemail.com>2008-11-06 23:42:42 +0000
commit239d06bd4710e8463c6cc7e5411965066a6d134e (patch)
tree10b9f670ec97b651bca9fcbe42a48003b687cd45 /mailutils/mail.c
parentb9d572a2733fa20957a9a3287bd04d66176e3b6a (diff)
downloadbusybox-239d06bd4710e8463c6cc7e5411965066a6d134e.tar.gz
busybox-239d06bd4710e8463c6cc7e5411965066a6d134e.tar.bz2
add mailutils/*
Diffstat (limited to 'mailutils/mail.c')
-rw-r--r--mailutils/mail.c242
1 files changed, 242 insertions, 0 deletions
diff --git a/mailutils/mail.c b/mailutils/mail.c
new file mode 100644
index 000000000..ab1304a7f
--- /dev/null
+++ b/mailutils/mail.c
@@ -0,0 +1,242 @@
+/* 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 tarball for details.
+ */
+#include "libbb.h"
+#include "mail.h"
+
+static void kill_helper(void)
+{
+ // TODO!!!: is there more elegant way to terminate child on program failure?
+ if (G.helper_pid > 0)
+ kill(G.helper_pid, SIGTERM);
+}
+
+// generic signal handler
+static void signal_handler(int signo)
+{
+#define err signo
+ if (SIGALRM == signo) {
+ kill_helper();
+ bb_error_msg_and_die("timed out");
+ }
+
+ // SIGCHLD. reap zombies
+ if (safe_waitpid(G.helper_pid, &err, WNOHANG) > 0)
+ if (WIFEXITED(err)) {
+ G.helper_pid = 0;
+ if (WEXITSTATUS(err))
+ bb_error_msg_and_die("child exited (%d)", WEXITSTATUS(err));
+ }
+#undef err
+}
+
+void FAST_FUNC launch_helper(const char **argv)
+{
+ // setup vanilla unidirectional pipes interchange
+ int idx;
+ int pipes[4];
+
+ xpipe(pipes);
+ xpipe(pipes+2);
+ G.helper_pid = vfork();
+ if (G.helper_pid < 0)
+ bb_perror_msg_and_die("vfork");
+ idx = (!G.helper_pid) * 2;
+ xdup2(pipes[idx], STDIN_FILENO);
+ xdup2(pipes[3-idx], STDOUT_FILENO);
+ if (ENABLE_FEATURE_CLEAN_UP)
+ for (int i = 4; --i >= 0; )
+ if (pipes[i] > STDOUT_FILENO)
+ close(pipes[i]);
+ if (!G.helper_pid) {
+ // child: try to execute connection helper
+ BB_EXECVP(*argv, (char **)argv);
+ _exit(127);
+ }
+ // parent: check whether child is alive
+ bb_signals(0
+ + (1 << SIGCHLD)
+ + (1 << SIGALRM)
+ , signal_handler);
+ signal_handler(SIGCHLD);
+ // child seems OK -> parent goes on
+ atexit(kill_helper);
+}
+
+const FAST_FUNC char *command(const char *fmt, const char *param)
+{
+ const char *msg = fmt;
+ if (timeout)
+ alarm(timeout);
+ if (msg) {
+ msg = xasprintf(fmt, param);
+ printf("%s\r\n", msg);
+ }
+ fflush(stdout);
+ 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;
+}
+*/
+
+void FAST_FUNC encode_base64(char *fname, const char *text, const char *eol)
+{
+ enum {
+ SRC_BUF_SIZE = 45, /* This *MUST* be a multiple of 3 */
+ DST_BUF_SIZE = 4 * ((SRC_BUF_SIZE + 2) / 3),
+ };
+
+#define src_buf text
+ FILE *fp = fp;
+ ssize_t len = len;
+ char dst_buf[DST_BUF_SIZE + 1];
+
+ if (fname) {
+ fp = (NOT_LONE_DASH(fname)) ? xfopen_for_read(fname) : (FILE *)text;
+ src_buf = bb_common_bufsiz1;
+ // N.B. strlen(NULL) segfaults!
+ } else if (text) {
+ // though we do not call uuencode(NULL, NULL) explicitly
+ // still we do not want to break things suddenly
+ len = strlen(text);
+ } else
+ return;
+
+ while (1) {
+ size_t size;
+ if (fname) {
+ size = fread((char *)src_buf, 1, SRC_BUF_SIZE, fp);
+ if ((ssize_t)size < 0)
+ bb_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) {
+ printf("%s\n", eol);
+ } 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 decode_base64(FILE *src_stream, FILE *dst_stream)
+{
+ int term_count = 1;
+
+ while (1) {
+ char translated[4];
+ int count = 0;
+
+ while (count < 4) {
+ char *table_ptr;
+ int ch;
+
+ /* Get next _valid_ character.
+ * global vector bb_uuenc_tbl_base64[] contains this string:
+ * "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n"
+ */
+ do {
+ ch = fgetc(src_stream);
+ if (ch == EOF) {
+ bb_error_msg_and_die(bb_msg_read_error);
+ }
+ // - means end of MIME section
+ if ('-' == ch) {
+ // push it back
+ ungetc(ch, src_stream);
+ return;
+ }
+ table_ptr = strchr(bb_uuenc_tbl_base64, ch);
+ } while (table_ptr == NULL);
+
+ /* Convert encoded character to decimal */
+ ch = table_ptr - bb_uuenc_tbl_base64;
+
+ if (*table_ptr == '=') {
+ if (term_count == 0) {
+ translated[count] = '\0';
+ break;
+ }
+ term_count++;
+ } else if (*table_ptr == '\n') {
+ /* Check for terminating line */
+ if (term_count == 5) {
+ return;
+ }
+ term_count = 1;
+ continue;
+ } else {
+ translated[count] = ch;
+ count++;
+ term_count = 0;
+ }
+ }
+
+ /* Merge 6 bit chars to 8 bit */
+ if (count > 1) {
+ fputc(translated[0] << 2 | translated[1] >> 4, dst_stream);
+ }
+ if (count > 2) {
+ fputc(translated[1] << 4 | translated[2] >> 2, dst_stream);
+ }
+ if (count > 3) {
+ fputc(translated[2] << 6 | translated[3], dst_stream);
+ }
+ }
+}
+
+
+/*
+ * get username and password from a file descriptor
+ */
+void FAST_FUNC get_cred_or_die(int fd)
+{
+ // either from TTY
+ if (isatty(fd)) {
+ G.user = xstrdup(bb_askpass(0, "User: "));
+ G.pass = xstrdup(bb_askpass(0, "Password: "));
+ // or from STDIN
+ } else {
+ FILE *fp = fdopen(fd, "r");
+ G.user = xmalloc_fgetline(fp);
+ G.pass = xmalloc_fgetline(fp);
+ fclose(fp);
+ }
+ if (!G.user || !*G.user || !G.pass || !*G.pass)
+ bb_error_msg_and_die("no username or password");
+}