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sendmail: support AUTH PLAIN in addition to AUTH LOGIN

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Implement the -am argument to allow choosing an AUTH method.
For now only PLAIN and LOGIN are supported, but others can be added
easily in the future.

AUTH PLAIN required adding a new variant of encode_base64() capable of
handling NUL characters in the input string; the old function is now a
wrapper for the newer one.

function                                             old     new   delta
encode_n_base64                                        -     236    +236
sendmail_main                                       1199    1380    +181
packed_usage                                       32873   32877      +4
encode_base64                                        242      36    -206
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 2/1 up/down: 421/-206)          Total: 215 bytes

Signed-off-by: Raffaello D. Di Napoli <rafdev@dinapo.li>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Raffaello D. Di Napoli 2018-06-26 19:17:45 -04:00 • committed by Denys Vlasenko
parent c16ae469ef
commit f28b8857a9
3 changed files with 45 additions and 14 deletions
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1
mailutils/mail.h
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@ -35,3 +35,4 @@ void get_cred_or_die(int fd) FAST_FUNC;
char *send_mail_command(const char *fmt, const char *param) FAST_FUNC;
void encode_base64(char *fname, const char *text, const char *eol) FAST_FUNC;
void encode_n_base64(char *fname, const char *text, size_t size, const char *eol) FAST_FUNC;