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Diffstat (limited to 'networking')
-rw-r--r--networking/sendmail.c180
1 files changed, 102 insertions, 78 deletions
diff --git a/networking/sendmail.c b/networking/sendmail.c
index 2ea10b1..fa1abc7 100644
--- a/networking/sendmail.c
+++ b/networking/sendmail.c
@@ -16,45 +16,46 @@ enum {
DST_BUF_SIZE = 4 * ((SRC_BUF_SIZE + 2) / 3),
};
-static void uuencode(const char *fname)
+static void uuencode(char *fname, const char *text)
{
+#define src_buf text
int fd;
- char src_buf[SRC_BUF_SIZE];
- char dst_buf[1 + DST_BUF_SIZE + 1];
+#define len fd
+ char dst_buf[DST_BUF_SIZE + 1];
- fd = xopen(fname, O_RDONLY);
- fflush(stdout);
- dst_buf[0] = '\n';
+ if (fname) {
+ fd = xopen(fname, O_RDONLY);
+ src_buf = bb_common_bufsiz1;
+ } else {
+ len = strlen(text);
+ }
+
+ fflush(stdout); // sync stdio and unistd output
while (1) {
- size_t size = full_read(fd, src_buf, SRC_BUF_SIZE);
+ size_t size;
+ if (fname) {
+ size = full_read(fd, (char *)src_buf, SRC_BUF_SIZE);
+ 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;
- if ((ssize_t)size < 0)
- bb_perror_msg_and_die(bb_msg_read_error);
- /* Encode the buffer we just read in */
- bb_uuencode(dst_buf + 1, src_buf, size, bb_uuenc_tbl_base64);
- xwrite(STDOUT_FILENO, dst_buf, 1 + 4 * ((size + 2) / 3));
- }
- close(fd);
-}
-
-// "inline" version
-// encodes content of given buffer instead of fd
-// used to encode subject and authentication terms
-static void uuencode_inline(const char *src_buf)
-{
- size_t len;
- char dst_buf[DST_BUF_SIZE + 1];
-
- len = strlen(src_buf);
- fflush(stdout);
- while (len > 0) {
- size_t chunk = (len <= SRC_BUF_SIZE) ? len : SRC_BUF_SIZE;
- bb_uuencode(dst_buf, src_buf, chunk, bb_uuenc_tbl_base64);
- xwrite(STDOUT_FILENO, dst_buf, 4 * ((chunk + 2) / 3));
- src_buf += chunk;
- len -= chunk;
+ // Encode the buffer we just read in
+ bb_uuencode(dst_buf, src_buf, size, bb_uuenc_tbl_base64);
+ if (fname) {
+ xwrite(STDOUT_FILENO, "\n", 1);
+ } else {
+ src_buf += size;
+ len -= size;
+ }
+ xwrite(STDOUT_FILENO, dst_buf, 4 * ((size + 2) / 3));
}
+ if (ENABLE_FEATURE_CLEAN_UP && fname)
+ close(fd);
}
#if ENABLE_FEATURE_SENDMAIL_NETWORK
@@ -72,7 +73,7 @@ static void signal_handler(int signo)
bb_error_msg_and_die("child exited (%d)", WEXITSTATUS(err));
}
-static pid_t helper_pid = -1;
+static pid_t helper_pid;
// read stdin, parses first bytes to a number, i.e. server response
// if code = -1 then just return this number
@@ -92,7 +93,7 @@ static int check(int code, const char *errmsg)
return n;
}
}
- // TODO!!!: is there more elegant way to terminate child on program failure?
+ // TODO: is there more elegant way to terminate child on program failure?
if (helper_pid > 0)
kill(helper_pid, SIGTERM);
if (!answer)
@@ -104,9 +105,24 @@ static int check(int code, const char *errmsg)
static int puts_and_check(const char *msg, int code, const char *errmsg)
{
- puts(msg);
+ printf("%s\r\n", msg);
return check(code, errmsg);
}
+
+// strip argument of bad chars
+static char *sane(char *str)
+{
+ char *s = str;
+ char *p = s;
+ while (*s) {
+ if (isalnum(*s) || '_' == *s || '-' == *s || '.' == *s || '@' == *s) {
+ *p++ = *s;
+ }
+ s++;
+ }
+ *p = '\0';
+ return str;
+}
#endif
int sendmail_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
@@ -115,10 +131,10 @@ int sendmail_main(int argc, char **argv)
llist_t *recipients = NULL;
llist_t *bodies = NULL;
llist_t *attachments = NULL;
- const char *from;
- const char *notify;
+ char *from;
+ char *notify = NULL;
const char *subject;
- const char *charset = "utf-8";
+ char *charset = (char*)"utf-8";
#if ENABLE_FEATURE_SENDMAIL_NETWORK
const char *wsecs = "10";
const char *server = "127.0.0.1";
@@ -133,6 +149,7 @@ int sendmail_main(int argc, char **argv)
OPT_f = 1 << 0, // sender
OPT_n = 1 << 2, // notification
OPT_s = 1 << 3, // subject given
+ OPT_c = 1 << 6, // charset
OPT_d = 1 << 7, // dry run - no networking
OPT_w = 1 << 8, // network timeout
OPT_h = 1 << 9, // server
@@ -152,9 +169,10 @@ int sendmail_main(int argc, char **argv)
//argc -= optind;
argv += optind;
-//printf("OPTS[%4x]\n", opts);
-
- // TODO!!!: strip recipients and sender from <>
+ // sanitize user input
+ sane(from);
+ if (opts & OPT_c)
+ sane(charset);
// establish connection
#if ENABLE_FEATURE_SENDMAIL_NETWORK
@@ -167,24 +185,24 @@ int sendmail_main(int argc, char **argv)
bb_error_msg_and_die("no password");
}
}
-//printf("OPTS[%4x][%s][%s]\n", opts, opt_user, opt_pass);
-//exit(0);
// set chat timeout
alarm(timeout);
// connect to server
if (argv[0]) {
// if connection helper given
// setup vanilla unidirectional pipes interchange
+ int idx;
int pipes[4];
xpipe(pipes);
xpipe(pipes+2);
helper_pid = vfork();
if (helper_pid < 0)
bb_perror_msg_and_die("vfork");
- xdup2(pipes[(helper_pid)?0:2], STDIN_FILENO);
- xdup2(pipes[(helper_pid)?3:1], STDOUT_FILENO);
+ idx = (!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; )
+ for (int i = 4; --i >= 0;)
if (pipes[i] > STDOUT_FILENO)
close(pipes[i]);
// replace child with connection helper
@@ -210,10 +228,12 @@ int sendmail_main(int argc, char **argv)
check(220, "INIT");
}
// mail user specified? try modern AUTHentication
- if (opt_user && (334 == puts_and_check("auth login", -1, "auth login"))) {
- uuencode_inline(opt_user);
+ if ((opts & OPT_U)
+ && (334 == puts_and_check("auth login", -1, "auth login"))
+ ) {
+ uuencode(NULL, opt_user);
puts_and_check("", 334, "AUTH");
- uuencode_inline(opt_pass);
+ uuencode(NULL, opt_pass);
puts_and_check("", 235, "AUTH");
// no mail user specified or modern AUTHentication is not supported?
} else {
@@ -224,15 +244,15 @@ int sendmail_main(int argc, char **argv)
domain++;
else
domain = "local";
- printf("helo %s\n", domain);
+ printf("helo %s\r\n", domain);
check(250, "HELO");
}
// set addresses
- printf("mail from:<%s>\n", from);
+ printf("mail from:<%s>\r\n", from);
check(250, "MAIL FROM");
for (llist_t *to = recipients; to; to = to->link) {
- printf("rcpt to:<%s>\n", to->data);
+ printf("rcpt to:<%s>\r\n", sane(to->data));
check(250, "RCPT TO");
}
puts_and_check("data", 354, "DATA");
@@ -243,60 +263,64 @@ int sendmail_main(int argc, char **argv)
// now put message
// put address headers
- printf("From: %s\n", from);
+ printf("From: %s\r\n", from);
for (llist_t *to = recipients; to; to = to->link) {
- printf("To: %s\n", to->data);
+ printf("To: %s\r\n", sane(to->data));
}
// put encoded subject
if (opts & OPT_s) {
printf("Subject: =?%s?B?", charset);
- uuencode_inline(subject);
- puts("?=");
+ uuencode(NULL, subject);
+ puts("?=\r");
}
// put notification
if (opts & OPT_n) {
- const char *s = notify;
- if (!s[0])
- s = from; // notify sender by default
- printf("Disposition-Notification-To: %s\n", s);
+ // -n without parameter?
+ if (!notify)
+ notify = from; // notify sender by default
+ printf("Disposition-Notification-To: %s\r\n", sane(notify));
}
// put common headers and body start
//srand(?);
boundary = xasprintf("%d-%d-%d", rand(), rand(), rand());
printf(
- "X-Mailer: busybox " BB_VER " sendmail\n"
- "X-Priority: 3\n"
- "Message-ID: <%s>\n"
- "Mime-Version: 1.0\n"
- "Content-Type: multipart/mixed; boundary=\"%s\"\n"
- "\n"
- "--%s\n"
- "Content-Type: text/plain; charset=%s\n"
- "%s\n%s"
- , boundary, boundary, boundary, charset
+ "X-Mailer: busybox " BB_VER " sendmail\r\n"
+ "Message-ID: <%s>\r\n"
+ "Mime-Version: 1.0\r\n"
+ "%smultipart/mixed; boundary=\"%s\"\r\n"
+ "\r\n"
+ "--%s\r\n"
+ "%stext/plain; charset=%s\r\n"
+ "%s\r\n%s"
+ , boundary
+ , "Content-Type: "
+ , boundary, boundary
+ , "Content-Type: "
+ , charset
, "Content-Disposition: inline"
- , "Content-Transfer-Encoding: base64\n"
+ , "Content-Transfer-Encoding: base64\r\n"
);
// put body(ies)
for (llist_t *f = bodies; f; f = f->link) {
- uuencode(f->data);
+ uuencode(f->data, NULL);
}
// put attachment(s)
for (llist_t *f = attachments; f; f = f->link) {
printf(
- "\n--%s\n"
- "Content-Type: application/octet-stream\n"
- "%s; filename=\"%s\"\n"
+ "\r\n--%s\r\n"
+ "%sapplication/octet-stream\r\n"
+ "%s; filename=\"%s\"\r\n"
"%s"
, boundary
+ , "Content-Type: "
, "Content-Disposition: inline"
, bb_get_last_path_component_strip(f->data)
- , "Content-Transfer-Encoding: base64\n"
+ , "Content-Transfer-Encoding: base64\r\n"
);
- uuencode(f->data);
+ uuencode(f->data, NULL);
}
// put terminator
- printf("\n--%s--\n\n", boundary);
+ printf("\r\n--%s--\r\n\r\n", boundary);
if (ENABLE_FEATURE_CLEAN_UP)
free(boundary);
generated by cgit v1.1 at 2024-12-28 08:17:34 +0000