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");
+}