Mercurial > hg > nginx
view src/mail/ngx_mail_parse.c @ 9086:f68fdb017141 quic
QUIC: optimized sending stream response.
When a stream is created by client, it's often the case that nginx will send
immediate response on that stream. An example is HTTP/3 request stream, which
in most cases quickly replies with at least HTTP headers.
QUIC stream init handlers are called from a posted event. Output QUIC
frames are also sent to client from a posted event, called the push event.
If the push event is posted before the stream init event, then output produced
by stream may trigger sending an extra UDP datagram. To address this, push
event is now re-posted when a new stream init event is posted.
An example is handling 0-RTT packets. Client typically sends an init packet
coalesced with a 0-RTT packet. Previously, nginx replied with a padded CRYPTO
datagram, followed by a 1-RTT stream reply datagram. Now CRYPTO and STREAM
packets are coalesced in one reply datagram, which saves bandwidth.
Other examples include coalescing 1-RTT first stream response, and
MAX_STREAMS/STREAM sent in response to ACK/STREAM.
| author | Roman Arutyunyan <arut@nginx.com> |
|---|---|
| date | Mon, 03 Apr 2023 16:17:12 +0400 |
| parents | b38728495e1a |
| children | 32d4582c484d |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_event.h> #include <ngx_mail.h> #include <ngx_mail_pop3_module.h> #include <ngx_mail_imap_module.h> #include <ngx_mail_smtp_module.h> ngx_int_t ngx_mail_pop3_parse_command(ngx_mail_session_t *s) { u_char ch, *p, *c, c0, c1, c2, c3; ngx_str_t *arg; enum { sw_start = 0, sw_command, sw_invalid, sw_spaces_before_argument, sw_argument, sw_almost_done } state; state = s->state; for (p = s->buffer->pos; p < s->buffer->last; p++) { ch = *p; switch (state) { /* POP3 command */ case sw_start: s->cmd_start = p; state = sw_command; /* fall through */ case sw_command: if (ch == ' ' || ch == CR || ch == LF) { c = s->cmd_start; if (p - c == 4) { c0 = ngx_toupper(c[0]); c1 = ngx_toupper(c[1]); c2 = ngx_toupper(c[2]); c3 = ngx_toupper(c[3]); if (c0 == 'U' && c1 == 'S' && c2 == 'E' && c3 == 'R') { s->command = NGX_POP3_USER; } else if (c0 == 'P' && c1 == 'A' && c2 == 'S' && c3 == 'S') { s->command = NGX_POP3_PASS; } else if (c0 == 'A' && c1 == 'P' && c2 == 'O' && c3 == 'P') { s->command = NGX_POP3_APOP; } else if (c0 == 'Q' && c1 == 'U' && c2 == 'I' && c3 == 'T') { s->command = NGX_POP3_QUIT; } else if (c0 == 'C' && c1 == 'A' && c2 == 'P' && c3 == 'A') { s->command = NGX_POP3_CAPA; } else if (c0 == 'A' && c1 == 'U' && c2 == 'T' && c3 == 'H') { s->command = NGX_POP3_AUTH; } else if (c0 == 'N' && c1 == 'O' && c2 == 'O' && c3 == 'P') { s->command = NGX_POP3_NOOP; #if (NGX_MAIL_SSL) } else if (c0 == 'S' && c1 == 'T' && c2 == 'L' && c3 == 'S') { s->command = NGX_POP3_STLS; #endif } else { goto invalid; } } else { goto invalid; } s->cmd.data = s->cmd_start; s->cmd.len = p - s->cmd_start; switch (ch) { case ' ': state = sw_spaces_before_argument; break; case CR: state = sw_almost_done; break; case LF: goto done; } break; } if ((ch < 'A' || ch > 'Z') && (ch < 'a' || ch > 'z')) { goto invalid; } break; case sw_invalid: goto invalid; case sw_spaces_before_argument: switch (ch) { case ' ': break; case CR: state = sw_almost_done; break; case LF: goto done; default: if (s->args.nelts <= 2) { state = sw_argument; s->arg_start = p; break; } goto invalid; } break; case sw_argument: switch (ch) { case ' ': /* * the space should be considered as part of the at username * or password, but not of argument in other commands */ if (s->command == NGX_POP3_USER || s->command == NGX_POP3_PASS) { break; } /* fall through */ case CR: case LF: arg = ngx_array_push(&s->args); if (arg == NULL) { return NGX_ERROR; } arg->len = p - s->arg_start; arg->data = s->arg_start; s->arg_start = NULL; switch (ch) { case ' ': state = sw_spaces_before_argument; break; case CR: state = sw_almost_done; break; case LF: goto done; } break; default: break; } break; case sw_almost_done: switch (ch) { case LF: goto done; default: goto invalid; } } } s->buffer->pos = p; s->state = state; return NGX_AGAIN; done: s->buffer->pos = p + 1; s->state = (s->command != NGX_POP3_AUTH) ? sw_start : sw_argument; return NGX_OK; invalid: s->state = sw_invalid; /* skip invalid command till LF */ for ( /* void */ ; p < s->buffer->last; p++) { if (*p == LF) { s->state = sw_start; s->buffer->pos = p + 1; return NGX_MAIL_PARSE_INVALID_COMMAND; } } s->buffer->pos = p; return NGX_AGAIN; } ngx_int_t ngx_mail_imap_parse_command(ngx_mail_session_t *s) { u_char ch, *p, *c, *dst, *src, *end; ngx_str_t *arg; enum { sw_start = 0, sw_tag, sw_invalid, sw_spaces_before_command, sw_command, sw_spaces_before_argument, sw_argument, sw_backslash, sw_literal, sw_no_sync_literal_argument, sw_start_literal_argument, sw_literal_argument, sw_end_literal_argument, sw_almost_done } state; state = s->state; for (p = s->buffer->pos; p < s->buffer->last; p++) { ch = *p; switch (state) { /* IMAP tag */ case sw_start: s->tag_start = p; state = sw_tag; /* fall through */ case sw_tag: switch (ch) { case ' ': s->tag.len = p - s->tag_start + 1; s->tag.data = s->tag_start; state = sw_spaces_before_command; break; case CR: case LF: goto invalid; default: if ((ch < 'A' || ch > 'Z') && (ch < 'a' || ch > 'z') && (ch < '0' || ch > '9') && ch != '-' && ch != '.' && ch != '_') { goto invalid; } if (p - s->tag_start > 31) { goto invalid; } break; } break; case sw_invalid: goto invalid; case sw_spaces_before_command: switch (ch) { case ' ': break; case CR: case LF: goto invalid; default: s->cmd_start = p; state = sw_command; break; } break; case sw_command: if (ch == ' ' || ch == CR || ch == LF) { c = s->cmd_start; switch (p - c) { case 4: if ((c[0] == 'N' || c[0] == 'n') && (c[1] == 'O'|| c[1] == 'o') && (c[2] == 'O'|| c[2] == 'o') && (c[3] == 'P'|| c[3] == 'p')) { s->command = NGX_IMAP_NOOP; } else { goto invalid; } break; case 5: if ((c[0] == 'L'|| c[0] == 'l') && (c[1] == 'O'|| c[1] == 'o') && (c[2] == 'G'|| c[2] == 'g') && (c[3] == 'I'|| c[3] == 'i') && (c[4] == 'N'|| c[4] == 'n')) { s->command = NGX_IMAP_LOGIN; } else { goto invalid; } break; case 6: if ((c[0] == 'L'|| c[0] == 'l') && (c[1] == 'O'|| c[1] == 'o') && (c[2] == 'G'|| c[2] == 'g') && (c[3] == 'O'|| c[3] == 'o') && (c[4] == 'U'|| c[4] == 'u') && (c[5] == 'T'|| c[5] == 't')) { s->command = NGX_IMAP_LOGOUT; } else { goto invalid; } break; #if (NGX_MAIL_SSL) case 8: if ((c[0] == 'S'|| c[0] == 's') && (c[1] == 'T'|| c[1] == 't') && (c[2] == 'A'|| c[2] == 'a') && (c[3] == 'R'|| c[3] == 'r') && (c[4] == 'T'|| c[4] == 't') && (c[5] == 'T'|| c[5] == 't') && (c[6] == 'L'|| c[6] == 'l') && (c[7] == 'S'|| c[7] == 's')) { s->command = NGX_IMAP_STARTTLS; } else { goto invalid; } break; #endif case 10: if ((c[0] == 'C'|| c[0] == 'c') && (c[1] == 'A'|| c[1] == 'a') && (c[2] == 'P'|| c[2] == 'p') && (c[3] == 'A'|| c[3] == 'a') && (c[4] == 'B'|| c[4] == 'b') && (c[5] == 'I'|| c[5] == 'i') && (c[6] == 'L'|| c[6] == 'l') && (c[7] == 'I'|| c[7] == 'i') && (c[8] == 'T'|| c[8] == 't') && (c[9] == 'Y'|| c[9] == 'y')) { s->command = NGX_IMAP_CAPABILITY; } else { goto invalid; } break; case 12: if ((c[0] == 'A'|| c[0] == 'a') && (c[1] == 'U'|| c[1] == 'u') && (c[2] == 'T'|| c[2] == 't') && (c[3] == 'H'|| c[3] == 'h') && (c[4] == 'E'|| c[4] == 'e') && (c[5] == 'N'|| c[5] == 'n') && (c[6] == 'T'|| c[6] == 't') && (c[7] == 'I'|| c[7] == 'i') && (c[8] == 'C'|| c[8] == 'c') && (c[9] == 'A'|| c[9] == 'a') && (c[10] == 'T'|| c[10] == 't') && (c[11] == 'E'|| c[11] == 'e')) { s->command = NGX_IMAP_AUTHENTICATE; } else { goto invalid; } break; default: goto invalid; } s->cmd.data = s->cmd_start; s->cmd.len = p - s->cmd_start; switch (ch) { case ' ': state = sw_spaces_before_argument; break; case CR: state = sw_almost_done; break; case LF: goto done; } break; } if ((ch < 'A' || ch > 'Z') && (ch < 'a' || ch > 'z')) { goto invalid; } break; case sw_spaces_before_argument: switch (ch) { case ' ': break; case CR: state = sw_almost_done; break; case LF: goto done; case '"': if (s->args.nelts <= 2) { s->quoted = 1; s->arg_start = p + 1; state = sw_argument; break; } goto invalid; case '{': if (s->args.nelts <= 2) { state = sw_literal; break; } goto invalid; default: if (s->args.nelts <= 2) { s->arg_start = p; state = sw_argument; break; } goto invalid; } break; case sw_argument: if (ch == ' ' && s->quoted) { break; } switch (ch) { case '"': if (!s->quoted) { break; } s->quoted = 0; /* fall through */ case ' ': case CR: case LF: arg = ngx_array_push(&s->args); if (arg == NULL) { return NGX_ERROR; } arg->len = p - s->arg_start; arg->data = s->arg_start; if (s->backslash) { dst = s->arg_start; end = p; for (src = dst; src < end; dst++) { *dst = *src; if (*src++ == '\\') { *dst = *src++; } } arg->len = dst - s->arg_start; s->backslash = 0; } s->arg_start = NULL; switch (ch) { case '"': case ' ': state = sw_spaces_before_argument; break; case CR: state = sw_almost_done; break; case LF: goto done; } break; case '\\': if (s->quoted) { s->backslash = 1; state = sw_backslash; } break; } break; case sw_backslash: switch (ch) { case CR: case LF: goto invalid; default: state = sw_argument; } break; case sw_literal: if (ch >= '0' && ch <= '9') { s->literal_len = s->literal_len * 10 + (ch - '0'); break; } if (ch == '}') { state = sw_start_literal_argument; break; } if (ch == '+') { state = sw_no_sync_literal_argument; break; } goto invalid; case sw_no_sync_literal_argument: if (ch == '}') { s->no_sync_literal = 1; state = sw_start_literal_argument; break; } goto invalid; case sw_start_literal_argument: switch (ch) { case CR: break; case LF: s->buffer->pos = p + 1; s->arg_start = p + 1; if (s->no_sync_literal == 0) { s->state = sw_literal_argument; return NGX_IMAP_NEXT; } state = sw_literal_argument; s->no_sync_literal = 0; break; default: goto invalid; } break; case sw_literal_argument: if (s->literal_len && --s->literal_len) { break; } arg = ngx_array_push(&s->args); if (arg == NULL) { return NGX_ERROR; } arg->len = p + 1 - s->arg_start; arg->data = s->arg_start; s->arg_start = NULL; state = sw_end_literal_argument; break; case sw_end_literal_argument: switch (ch) { case '{': if (s->args.nelts <= 2) { state = sw_literal; break; } goto invalid; case CR: state = sw_almost_done; break; case LF: goto done; default: state = sw_spaces_before_argument; break; } break; case sw_almost_done: switch (ch) { case LF: goto done; default: goto invalid; } } } s->buffer->pos = p; s->state = state; return NGX_AGAIN; done: s->buffer->pos = p + 1; s->state = (s->command != NGX_IMAP_AUTHENTICATE) ? sw_start : sw_argument; return NGX_OK; invalid: s->state = sw_invalid; s->quoted = 0; s->backslash = 0; s->no_sync_literal = 0; s->literal_len = 0; /* skip invalid command till LF */ for ( /* void */ ; p < s->buffer->last; p++) { if (*p == LF) { s->state = sw_start; s->buffer->pos = p + 1; /* detect non-synchronizing literals */ if ((size_t) (p - s->buffer->start) > sizeof("{1+}") - 1) { p--; if (*p == CR) { p--; } if (*p == '}' && *(p - 1) == '+') { s->quit = 1; } } return NGX_MAIL_PARSE_INVALID_COMMAND; } } s->buffer->pos = p; return NGX_AGAIN; } ngx_int_t ngx_mail_smtp_parse_command(ngx_mail_session_t *s) { u_char ch, *p, *c, c0, c1, c2, c3; ngx_str_t *arg; enum { sw_start = 0, sw_command, sw_invalid, sw_spaces_before_argument, sw_argument, sw_almost_done } state; state = s->state; for (p = s->buffer->pos; p < s->buffer->last; p++) { ch = *p; switch (state) { /* SMTP command */ case sw_start: s->cmd_start = p; state = sw_command; /* fall through */ case sw_command: if (ch == ' ' || ch == CR || ch == LF) { c = s->cmd_start; if (p - c == 4) { c0 = ngx_toupper(c[0]); c1 = ngx_toupper(c[1]); c2 = ngx_toupper(c[2]); c3 = ngx_toupper(c[3]); if (c0 == 'H' && c1 == 'E' && c2 == 'L' && c3 == 'O') { s->command = NGX_SMTP_HELO; } else if (c0 == 'E' && c1 == 'H' && c2 == 'L' && c3 == 'O') { s->command = NGX_SMTP_EHLO; } else if (c0 == 'Q' && c1 == 'U' && c2 == 'I' && c3 == 'T') { s->command = NGX_SMTP_QUIT; } else if (c0 == 'A' && c1 == 'U' && c2 == 'T' && c3 == 'H') { s->command = NGX_SMTP_AUTH; } else if (c0 == 'N' && c1 == 'O' && c2 == 'O' && c3 == 'P') { s->command = NGX_SMTP_NOOP; } else if (c0 == 'M' && c1 == 'A' && c2 == 'I' && c3 == 'L') { s->command = NGX_SMTP_MAIL; } else if (c0 == 'R' && c1 == 'S' && c2 == 'E' && c3 == 'T') { s->command = NGX_SMTP_RSET; } else if (c0 == 'R' && c1 == 'C' && c2 == 'P' && c3 == 'T') { s->command = NGX_SMTP_RCPT; } else if (c0 == 'V' && c1 == 'R' && c2 == 'F' && c3 == 'Y') { s->command = NGX_SMTP_VRFY; } else if (c0 == 'E' && c1 == 'X' && c2 == 'P' && c3 == 'N') { s->command = NGX_SMTP_EXPN; } else if (c0 == 'H' && c1 == 'E' && c2 == 'L' && c3 == 'P') { s->command = NGX_SMTP_HELP; } else { goto invalid; } #if (NGX_MAIL_SSL) } else if (p - c == 8) { if ((c[0] == 'S'|| c[0] == 's') && (c[1] == 'T'|| c[1] == 't') && (c[2] == 'A'|| c[2] == 'a') && (c[3] == 'R'|| c[3] == 'r') && (c[4] == 'T'|| c[4] == 't') && (c[5] == 'T'|| c[5] == 't') && (c[6] == 'L'|| c[6] == 'l') && (c[7] == 'S'|| c[7] == 's')) { s->command = NGX_SMTP_STARTTLS; } else { goto invalid; } #endif } else { goto invalid; } s->cmd.data = s->cmd_start; s->cmd.len = p - s->cmd_start; switch (ch) { case ' ': state = sw_spaces_before_argument; break; case CR: state = sw_almost_done; break; case LF: goto done; } break; } if ((ch < 'A' || ch > 'Z') && (ch < 'a' || ch > 'z')) { goto invalid; } break; case sw_invalid: goto invalid; case sw_spaces_before_argument: switch (ch) { case ' ': break; case CR: state = sw_almost_done; break; case LF: goto done; default: if (s->args.nelts <= 10) { state = sw_argument; s->arg_start = p; break; } goto invalid; } break; case sw_argument: switch (ch) { case ' ': case CR: case LF: arg = ngx_array_push(&s->args); if (arg == NULL) { return NGX_ERROR; } arg->len = p - s->arg_start; arg->data = s->arg_start; s->arg_start = NULL; switch (ch) { case ' ': state = sw_spaces_before_argument; break; case CR: state = sw_almost_done; break; case LF: goto done; } break; default: break; } break; case sw_almost_done: switch (ch) { case LF: goto done; default: goto invalid; } } } s->buffer->pos = p; s->state = state; return NGX_AGAIN; done: s->buffer->pos = p + 1; s->state = (s->command != NGX_SMTP_AUTH) ? sw_start : sw_argument; return NGX_OK; invalid: s->state = sw_invalid; /* skip invalid command till LF */ for ( /* void */ ; p < s->buffer->last; p++) { if (*p == LF) { s->state = sw_start; s->buffer->pos = p + 1; return NGX_MAIL_PARSE_INVALID_COMMAND; } } s->buffer->pos = p; return NGX_AGAIN; } ngx_int_t ngx_mail_auth_parse(ngx_mail_session_t *s, ngx_connection_t *c) { ngx_str_t *arg; #if (NGX_MAIL_SSL) if (ngx_mail_starttls_only(s, c)) { return NGX_MAIL_PARSE_INVALID_COMMAND; } #endif if (s->args.nelts == 0) { return NGX_MAIL_PARSE_INVALID_COMMAND; } arg = s->args.elts; if (arg[0].len == 5) { if (ngx_strncasecmp(arg[0].data, (u_char *) "LOGIN", 5) == 0) { if (s->args.nelts == 1) { return NGX_MAIL_AUTH_LOGIN; } if (s->args.nelts == 2) { return NGX_MAIL_AUTH_LOGIN_USERNAME; } return NGX_MAIL_PARSE_INVALID_COMMAND; } if (ngx_strncasecmp(arg[0].data, (u_char *) "PLAIN", 5) == 0) { if (s->args.nelts == 1) { return NGX_MAIL_AUTH_PLAIN; } if (s->args.nelts == 2) { return ngx_mail_auth_plain(s, c, 1); } } return NGX_MAIL_PARSE_INVALID_COMMAND; } if (arg[0].len == 8) { if (ngx_strncasecmp(arg[0].data, (u_char *) "CRAM-MD5", 8) == 0) { if (s->args.nelts != 1) { return NGX_MAIL_PARSE_INVALID_COMMAND; } return NGX_MAIL_AUTH_CRAM_MD5; } if (ngx_strncasecmp(arg[0].data, (u_char *) "EXTERNAL", 8) == 0) { if (s->args.nelts == 1) { return NGX_MAIL_AUTH_EXTERNAL; } if (s->args.nelts == 2) { return ngx_mail_auth_external(s, c, 1); } } return NGX_MAIL_PARSE_INVALID_COMMAND; } return NGX_MAIL_PARSE_INVALID_COMMAND; }