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sendmail: update from maintainer

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This commit is contained in:
Denis Vlasenko 2008-02-26 21:13:17 +00:00
parent 7be1030dcc
commit 17db1a9ac1
2 changed files with 218 additions and 160 deletions
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16
include/usage.h
View File

@ -1026,17 +1026,19 @@ USE_FEATURE_BRCTL_FANCY("\n" \
" -v Give fdisk version"
#define fetchmail_trivial_usage \
"[-C dir] [-w timeout] [-U user] -P password [-X] [-t] [-z] server[:port]"
"[-w timeout] [-U user] -P password [-X] [-t] [-z] server[:port] maildir [prog]"
#define fetchmail_full_usage \
"Fetch content of remote mailbox to local Maildir." \
"\n\nOptions:\n" \
" -C dir Set Maildir location\n" \
" -w timeout Set timeout on network operations\n" \
" -U username Authenticate with specified username\n" \
" -P password Authenticate with specified password\n" \
" -X Use openssl connection helper for secured servers\n" \
" -t Get only headers\n" \
" -z Delete messages on server"
" -z Delete messages on server" \
USE_FEATURE_FETCHMAIL_FILTER("\n" \
" prog Run prog <message file> on message delivery" \
)
#define findfs_trivial_usage \
"LABEL=label or UUID=uuid"
@ -3258,18 +3260,16 @@ USE_FEATURE_RUN_PARTS_FANCY("\n -l Prints names of all matching files even when
#define selinuxenabled_full_usage
#define sendmail_trivial_usage \
"[-C dir] [-w timeout] [-U user] [-P password] [-X]\n" \
"-t to [-t to] -f from [-n] [-s subject] [-c charset] server[:port] [body] [attachment ...]"
"[-w timeout] [-U user] [-P password] [-X]\n" \
"-t to [-t to]... [-n] [-s subject] [-c charset] server[:port] from [body] [attachment ...]"
#define sendmail_full_usage \
"Send an email with optional attachments." \
"\n\nOptions:\n" \
" -C dir Change current directory to dir\n" \
" -w timeout Set timeout on network operations\n" \
" -U username Authenticate with specified username\n" \
" -P password Authenticate with specified password\n" \
" -t address Recipient(s). May be multiple\n" \
" -X Use openssl connection helper for secured servers\n" \
" -t to Recipient email. May be multiple\n" \
" -f from Sender address\n" \
" -n Request delivery notification to sender\n" \
" -s subject Subject\n" \
" -c charset Assumed charset for body and subject [utf-8]"

350
networking/sendmail.c
View File

@ -27,9 +27,13 @@ static void uuencode(char *fname, const char *text)
if (NOT_LONE_DASH(fname))
fd = xopen(fname, O_RDONLY);
src_buf = bb_common_bufsiz1;
} else {
// 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;
fflush(stdout); // sync stdio and unistd output
while (1) {
@ -59,7 +63,38 @@ static void uuencode(char *fname, const char *text)
close(fd);
}
static pid_t helper_pid;
static const char *const init_xargs[9] = {
"openssl", "s_client", "-quiet", "-connect",
NULL, "-tls1", "-starttls", "smtp"
};
struct globals {
pid_t helper_pid;
unsigned timeout;
// arguments for SSL connection helper
const char *xargs[9];
#if ENABLE_FEATURE_FETCHMAIL_FILTER
// arguments for postprocess helper
const char *fargs[3];
#endif
};
#define G (*ptr_to_globals)
#define helper_pid (G.helper_pid)
#define timeout (G.timeout )
#define xargs (G.xargs )
#define fargs (G.fargs )
#define INIT_G() do { \
PTR_TO_GLOBALS = xzalloc(sizeof(G)); \
memcpy(xargs, init_xargs, sizeof(init_xargs)); \
fargs[0] = "utf-8"; \
} while (0)
#define opt_connect (xargs[4])
#define opt_after_connect (xargs[5])
#if ENABLE_FEATURE_FETCHMAIL_FILTER
#define opt_charset (fargs[0])
#define opt_subject (fargs[1])
#endif
static void kill_helper(void)
{
@ -71,7 +106,7 @@ static void kill_helper(void)
// generic signal handler
static void signal_handler(int signo)
{
int err;
#define err signo
if (SIGALRM == signo) {
kill_helper();
@ -107,11 +142,12 @@ static void launch_helper(const char **argv)
close(pipes[i]);
if (!helper_pid) {
// child - try to execute connection helper
BB_EXECVP(argv[0], (char **)argv);
// close(STDERR_FILENO);
BB_EXECVP(*argv, (char **)argv);
_exit(127);
}
// parent - check whether child is alive
bb_signals_recursive(0
bb_signals(0
+ (1 << SIGCHLD)
+ (1 << SIGALRM)
, signal_handler);
@ -119,8 +155,6 @@ static void launch_helper(const char **argv)
// child seems OK -> parent goes on
}
static unsigned timeout;
static char *command(const char *fmt, const char *param)
{
char *msg = (char *)fmt;
@ -145,7 +179,9 @@ static int smtp_checkp(const char *fmt, const char *param, int code)
// if code != -1 then checks whether the number equals the code
// if not equal -> die saying msg
#if ENABLE_FEATURE_SENDMAIL_EHLO
while ((answer = xmalloc_getline(stdin)) && '-' == answer[3]) ;
while ((answer = xmalloc_getline(stdin)) != NULL)
if (strlen(answer) <= 3 || '-' != answer[3])
break;
#else
answer = xmalloc_getline(stdin);
#endif
@ -169,27 +205,6 @@ static int smtp_check(const char *fmt, int code)
return smtp_checkp(fmt, NULL, code);
}
static void pop3_checkr(const char *fmt, const char *param, char **ret)
{
char *msg = command(fmt, param);
char *answer = xmalloc_getline(stdin);
if (answer && '+' == answer[0]) {
alarm(0);
if (ret)
*ret = answer;
else
free(answer);
return;
}
kill_helper();
bb_error_msg_and_die("%s failed", msg);
}
static void pop3_check(const char *fmt, const char *param)
{
pop3_checkr(fmt, param, NULL);
}
// strip argument of bad chars
static char *sane(char *str)
{
@ -205,13 +220,38 @@ static char *sane(char *str)
return str;
}
static void pop3_message(int fd)
#if ENABLE_FETCHMAIL
static void pop3_checkr(const char *fmt, const char *param, char **ret)
{
char *msg = command(fmt, param);
char *answer = xmalloc_getline(stdin);
if (answer && '+' == *answer) {
alarm(0);
if (ret)
*ret = answer+4; // skip "+OK "
else if (ENABLE_FEATURE_CLEAN_UP)
free(answer);
return;
}
kill_helper();
bb_error_msg_and_die("%s failed", msg);
}
static void pop3_check(const char *fmt, const char *param)
{
pop3_checkr(fmt, param, NULL);
}
static void pop3_message(const char *filename)
{
int fd;
char *answer;
// read stdin, copy to file fd
// create and open file filename
// read stdin, copy to created file
fd = xopen(filename, O_CREAT | O_WRONLY | O_TRUNC | O_EXCL);
while ((answer = xmalloc_fgets_str(stdin, "\r\n"))) {
char *s = answer;
if ('.' == answer[0]) {
if ('.' == *answer) {
if ('.' == answer[1])
s++;
else if ('\r' == answer[1] && '\n' == answer[2] && '\0' == answer[3])
@ -222,64 +262,56 @@ static void pop3_message(int fd)
}
close(fd);
}
static const char *args[] = {
"openssl", "s_client", "-quiet", "-connect", NULL, "-tls1", "-starttls", "smtp", NULL
};
#define opt_connect args[4]
#define opt_after_connect args[5]
#endif
int sendgetmail_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int sendgetmail_main(int argc, char **argv)
{
llist_t *recipients = NULL;
char *from;
const char *subject;
char *charset = (char *)"utf-8";
llist_t *opt_recipients = NULL;
#if !ENABLE_FEATURE_FETCHMAIL_FILTER
char *opt_subject;
char *opt_charset = (char *)"utf-8";
#endif
const char *opt_user;
const char *opt_pass;
const char *opt_timeout;
const char *opt_chdir;
enum {
OPT_C = 1 << 0, // chdir
OPT_w = 1 << 1, // network timeout
OPT_U = 1 << 2, // user
OPT_P = 1 << 3, // password
OPT_X = 1 << 4, // use openssl connection helper
OPT_w = 1 << 0, // network timeout
OPT_U = 1 << 1, // user
OPT_P = 1 << 2, // password
OPT_X = 1 << 3, // connect using openssl s_client helper
OPTS_t = 1 << 5, // sendmail "to"
OPTF_t = 1 << 5, // fetchmail "TOP"
OPTS_n = 1 << 4, // sendmail: request notification
OPTF_t = 1 << 4, // fetchmail: use "TOP" not "RETR"
OPTS_f = 1 << 6, // sendmail "from"
OPTF_z = 1 << 6, // fetchmail "delete"
OPTS_s = 1 << 5, // sendmail: subject
OPTF_z = 1 << 5, // fetchmail: delete from server
OPTS_n = 1 << 7, // notification
OPTS_s = 1 << 8, // subject given
OPTS_c = 1 << 9, // charset for subject and body
OPTS_c = 1 << 6, // sendmail: assumed charset
OPTS_t = 1 << 7, // sendmail: recipient(s)
};
const char *options;
unsigned opts;
INIT_G();
if (!ENABLE_FETCHMAIL || 's' == applet_name[0]) {
// SENDMAIL
if ('s' == applet_name[0]) {
// save initial stdin
// save initial stdin (body or attachements can be piped!)
xdup2(STDIN_FILENO, INITIAL_STDIN_FILENO);
// -f must be specified
// -t may be multiple
opt_complementary = "-1:f:t::";
options = "C:w:U:P:X" "t:f:ns:c:";
// FETCHMAIL
opt_complementary = "-2:w+:t:t::"; // count(-t) > 0
options = "w:U:P:X" "ns:c:t:";
} else {
// FETCHMAIL
opt_after_connect = NULL;
opt_complementary = "=1:P";
options = "C:w:U:P:X" "tz";
opt_complementary = "-2:w+:P";
options = "w:U:P:X" "tz";
}
opts = getopt32(argv, options,
&opt_chdir, &opt_timeout, &opt_user, &opt_pass,
&recipients, &from, &subject, &charset
&timeout, &opt_user, &opt_pass,
&opt_subject, &opt_charset, &opt_recipients
);
//argc -= optind;
@ -288,16 +320,9 @@ int sendgetmail_main(int argc, char **argv)
// first argument is remote server[:port]
opt_connect = *argv++;
if (opts & OPT_w)
timeout = xatou(opt_timeout);
// chdir
if (opts & OPT_C)
xchdir(opt_chdir);
// connect to server
if (opts & OPT_X) {
launch_helper(args);
launch_helper(xargs);
} else {
// no connection helper provided -> make plain connect
int fd = create_and_connect_stream_or_die(opt_connect, 0);
@ -305,24 +330,30 @@ int sendgetmail_main(int argc, char **argv)
xdup2(STDIN_FILENO, STDOUT_FILENO);
}
// randomize
srand(time(NULL));
#if ENABLE_FETCHMAIL
if (opt_after_connect)
#endif
{
// SENDMAIL
if (recipients) {
char *opt_from;
int code;
char *boundary;
const char *fmt;
const char *p;
char *q;
// wait for initial OK on plain connect
if (!(opts & OPT_X))
smtp_check(NULL, 220);
sane(from);
// get specified sender
opt_from = sane(*argv++);
// introduce to server
// should we respect modern (but useless here) EHLO?
// or should they respect we wanna be tiny?!
if (!ENABLE_FEATURE_SENDMAIL_EHLO || 250 != smtp_checkp("EHLO %s", from, -1)) {
smtp_checkp("HELO %s", from, 250);
if (!ENABLE_FEATURE_SENDMAIL_EHLO || 250 != smtp_checkp("EHLO %s", opt_from, -1)) {
smtp_checkp("HELO %s", opt_from, 250);
}
// set sender
@ -330,13 +361,13 @@ int sendgetmail_main(int argc, char **argv)
// no authentication is possible
code = (opts & OPT_P) ? -1 : 250;
// first try softly without authentication
while (250 != smtp_checkp("MAIL FROM:<%s>", from, code)) {
while (250 != smtp_checkp("MAIL FROM:<%s>", opt_from, code)) {
// MAIL FROM failed -> authentication needed
// do we have username?
if (!(opts & OPT_U)) {
// no! fetch it from "from" option
//opts |= OPT_U;
opt_user = xstrdup(from);
opt_user = xstrdup(opt_from);
*strchrnul(opt_user, '@') = '\0';
}
// now it seems we have username
@ -351,30 +382,35 @@ int sendgetmail_main(int argc, char **argv)
// but now die on failure
code = 250;
}
// set recipients
for (llist_t *to = recipients; to; to = to->link) {
for (llist_t *to = opt_recipients; to; to = to->link) {
smtp_checkp("RCPT TO:<%s>", sane(to->data), 250);
}
// now put message
smtp_check("DATA", 354);
// put address headers
printf("From: %s\r\n", from);
for (llist_t *to = recipients; to; to = to->link) {
printf("From: %s\r\n", opt_from);
for (llist_t *to = opt_recipients; to; to = to->link) {
printf("To: %s\r\n", to->data);
}
// put encoded subject
if (opts & OPTS_c)
sane(charset);
sane((char *)opt_charset);
if (opts & OPTS_s) {
printf("Subject: =?%s?B?", charset);
uuencode(NULL, subject);
printf("Subject: =?%s?B?", opt_charset);
uuencode(NULL, opt_subject);
printf("?=\r\n");
}
// put notification
if (opts & OPTS_n)
printf("Disposition-Notification-To: %s\r\n", from);
printf("Disposition-Notification-To: %s\r\n", opt_from);
// put common headers and body start
// randomize
#if ENABLE_FEATURE_SENDMAIL_BLOATY
srand(time(NULL));
#endif
boundary = xasprintf("%d-%d-%d", rand(), rand(), rand());
printf(
USE_FEATURE_SENDMAIL_BLOATY("X-Mailer: busybox " BB_VER " sendmail\r\n")
@ -386,16 +422,16 @@ int sendgetmail_main(int argc, char **argv)
, boundary
);
// put body + attachment(s)
{
const char *fmt =
fmt =
"\r\n--%s\r\n"
"%stext/plain; charset=%s\r\n"
"%s%s\r\n"
"%s"
;
const char *p = charset;
char *q = (char *)"";
while (argv[0]) {
p = opt_charset;
q = (char *)"";
while (*argv) {
printf(
fmt
, boundary
@ -414,9 +450,9 @@ int sendgetmail_main(int argc, char **argv)
;
uuencode(*argv, NULL);
if (*(++argv))
q = bb_get_last_path_component_strip(argv[0]);
}
q = bb_get_last_path_component_strip(*argv);
}
// put terminator
printf("\r\n--%s--\r\n" "\r\n", boundary);
if (ENABLE_FEATURE_CLEAN_UP)
@ -426,11 +462,25 @@ int sendgetmail_main(int argc, char **argv)
smtp_check(".", 250);
smtp_check("QUIT", 221);
// FETCHMAIL
#if ENABLE_FETCHMAIL
} else {
// authenticate
// FETCHMAIL
char *buf;
unsigned nmsg;
char *hostname;
pid_t pid;
// cache fetch command
const char *retr = (opts & OPTF_t) ? "TOP %u 0" : "RETR %u";
// goto maildir
xchdir(*argv++);
#if ENABLE_FEATURE_FETCHMAIL_FILTER
// cache postprocess program
*fargs = *argv;
#endif
// authenticate
if (!(opts & OPT_U)) {
//opts |= OPT_U;
opt_user = getenv("USER");
@ -438,25 +488,29 @@ int sendgetmail_main(int argc, char **argv)
#if ENABLE_FEATURE_FETCHMAIL_APOP
pop3_checkr(NULL, NULL, &buf);
// server supports APOP?
if ('<' == buf[4]) {
if ('<' == *buf) {
md5_ctx_t md5;
uint8_t hex[16*2 + 1];
// yes. compose <stamp><password>
char *s = strchr(buf, '>');
if (s)
strcpy(s+1, opt_pass);
s = buf+4;
s = buf;
// get md5 sum of <stamp><password>
md5_begin(&md5);
md5_hash(s, strlen(s), &md5);
md5_end(s, &md5);
bin2hex(hex, s, 16);
// NOTE: md5 struct contains enough space
// so we reuse md5 space instead of xzalloc(16*2+1)
#define md5_hex ((uint8_t *)&md5)
// uint8_t *md5_hex = (uint8_t *)&md5;
*bin2hex(md5_hex, s, 16) = '\0';
// APOP
s = xasprintf("%s %s", opt_user, hex);
s = xasprintf("%s %s", opt_user, md5_hex);
#undef md5_hex
pop3_check("APOP %s", s);
if (ENABLE_FEATURE_CLEAN_UP) {
free(s);
free(buf);
free(buf-4); // buf is "+OK " away from malloc'ed string
}
} else {
#else
@ -472,60 +526,64 @@ int sendgetmail_main(int argc, char **argv)
// get statistics
pop3_checkr("STAT", NULL, &buf);
// prepare message filename suffix
hostname = xzalloc(MAXHOSTNAMELEN+1);
gethostname(hostname, MAXHOSTNAMELEN);
pid = getpid();
// get number of messages
nmsg = atoi(buf+4);
// NOTE: we don't use xatou(buf) since buf is "nmsg nbytes"
// we only need nmsg and atoi is just exactly what we need
// if atoi fails to convert buf into number it returns 0
// in this case the following loop simply will not be executed
nmsg = atoi(buf);
if (ENABLE_FEATURE_CLEAN_UP)
free(buf);
free(buf-4); // buf is "+OK " away from malloc'ed string
// lock maildir
////USE_FEATURE_CLEAN_UP(close)(xopen(".lock", O_CREAT | O_WRONLY | O_TRUNC | O_EXCL));
// make tempnam(dir, salt) respect dir argument
unsetenv("TMPDIR");
// TODO: piping through external filter argv... if *argv
// cache fetch command
{
const char *retr = (opts & OPTF_t) ? "TOP %u 0" : "RETR %u";
// loop through messages
for (; nmsg; nmsg--) {
int fd;
char tmp_name[sizeof("tmp/XXXXXX")];
char new_name[sizeof("new/XXXXXX")];
char *filename = xasprintf("tmp/%llu.%u.%s", monotonic_us(), pid, hostname);
char *target;
#if ENABLE_FEATURE_FETCHMAIL_FILTER
int rc;
#endif
// retrieve message in ./tmp
strcpy(tmp_name, "tmp/XXXXXX");
fd = mkstemp(tmp_name);
if (fd < 0)
bb_perror_msg_and_die("cannot create unique file");
pop3_check(retr, (const char *)nmsg);
pop3_message(fd); // NB: closes fd
// move file to ./new atomically
strncpy(new_name, "new", 3);
strcpy(new_name + 3, tmp_name + 3);
if (rename(tmp_name, new_name) < 0) {
// rats! such file exists! try to make unique name
strcpy(new_name + 3, "tmp/XXXXXX" + 3);
fd = mkstemp(new_name);
if (fd < 0)
bb_perror_msg_and_die("cannot create unique file");
close(fd);
xrename(tmp_name, new_name);
}
pop3_message(filename);
// delete message from server
if (opts & OPTF_z)
pop3_check("DELE %u", (const char*)nmsg);
#if ENABLE_FEATURE_FETCHMAIL_FILTER
// run postprocessing program
if (*fargs) {
fargs[1] = filename;
rc = wait4pid(spawn((char **)fargs));
if (99 == rc)
break;
if (1 == rc)
goto skip;
}
#endif
// atomically move message to ./new
target = xstrdup(filename);
strncpy(target, "new", 3);
// ... or just stop receiving on error
if (rename_or_warn(filename, target))
break;
free(target);
#if ENABLE_FEATURE_FETCHMAIL_FILTER
skip:
#endif
free(filename);
}
if (ENABLE_FEATURE_CLEAN_UP)
free(hostname);
// Bye
pop3_check("QUIT", NULL);
// unlock maildir
////unlink(".lock");
#endif // ENABLE_FETCHMAIL
}
return 0;