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sendmail: fixes by Vladimir Dronnikov <dronnikov at gmail.com>

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This commit is contained in:
Denis Vlasenko 2008-02-02 17:54:35 +00:00
parent 5de754a395
commit a2980c6249
2 changed files with 113 additions and 87 deletions
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16
include/usage.h
View File

@ -3135,26 +3135,28 @@ USE_FEATURE_RUN_PARTS_FANCY("\n -l Prints names of all matching files even when
#define selinuxenabled_full_usage
#define sendmail_trivial_usage \
"[-d] {-t to}+ [-f from] [-n[notify]] [-s subject] [-b file]*\n" \
"[-a attachment]* [-c charset] [-w timeout] [-h server] [-p port] [-U user] [-P password]"
"{-t to}+ {-f from} [-n[notify]] [-s subject] [-b file]*\n" \
"[-a attachment]* [-c charset]" \
USE_FEATURE_SENDMAIL_NETWORK("\n" \
" [-d] [-w timeout] [-h server] [-p port] [-U user] [-P password]" \
)
#define sendmail_full_usage \
"Send an email from to with subject and optional attachments.\n" \
"Body is read from stdin or from optional files" \
"Send an email <from> <to> with <subject> and optional attachments." \
"\n\nArguments:\n" \
" -d Just dump composed message\n" \
" -t to Recipient email. May be multiple\n" \
" -f from Sender email\n" \
" -f from Sender address\n" \
" -n[notify] Optional notification address. If just -n given then notifies the sender\n" \
" -s subject Optional subject\n" \
" -b filename Optional body content file. May be multiple\n" \
" -a filename Optional file attachment. May be multiple\n" \
" -c charset Assumed charset for body and subject [koi8-r]" \
USE_FEATURE_SENDMAIL_NETWORK("\n" \
" -d Just dump composed message\n" \
" -w timeout Set timeout on network operations\n" \
" -h server Optional mail server name or IP [127.0.0.1]\n" \
" -p port Optional mail server port [25]\n" \
" -U username Authenticate using AUTH LOGIN with specified username\n" \
" -P password Authenticate using AUTH LOGIN with specified password"\
" -P password Authenticate using AUTH LOGIN with specified password" \
)
#define seq_trivial_usage \

184
networking/sendmail.c
View File

@ -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];
fd = xopen(fname, O_RDONLY);
fflush(stdout);
dst_buf[0] = '\n';
while (1) {
size_t size = full_read(fd, src_buf, 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;
#define len fd
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;
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;
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;
// 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);