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exiwhat: Ensure the SIGUSR1 signal handler is safe.
[exim.git] / src / src / local_scan.h
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1/* $Cambridge: exim/src/src/local_scan.h,v 1.13 2009/11/16 19:50:37 nm4 Exp $ */
2
3/*************************************************
4* Exim - an Internet mail transport agent *
5*************************************************/
6
7/* Copyright (c) University of Cambridge 1995 - 2009 */
8/* See the file NOTICE for conditions of use and distribution. */
9
10/* This file is the header that is the only Exim header to be included in the
11source for the local_scan.c() function. It contains definitions that are made
12available for use in that function, and which are documented.
13
14This API is also used for functions called by the ${dlfunc expansion item. */
15
16
17/* Some basic types that make some things easier, the Exim configuration
18settings, and the store functions. */
19
20#include <stdarg.h>
21#include <sys/types.h>
22#include "config.h"
23#include "mytypes.h"
24#include "store.h"
25
26
27/* The function and its return codes. */
28
29extern int local_scan(int, uschar **);
30
31enum {
32 LOCAL_SCAN_ACCEPT, /* Accept */
33 LOCAL_SCAN_ACCEPT_FREEZE, /* Accept, but freeze */
34 LOCAL_SCAN_ACCEPT_QUEUE, /* Accept, but no immediate delivery */
35 LOCAL_SCAN_REJECT, /* Permanent rejection */
36 LOCAL_SCAN_REJECT_NOLOGHDR, /* Permanent rejection, no log header */
37 LOCAL_SCAN_TEMPREJECT, /* Temporary rejection */
38 LOCAL_SCAN_TEMPREJECT_NOLOGHDR /* Temporary rejection, no log header */
39};
40
41
42/* Functions called by ${dlfunc{file}{func}{arg}...} return one of the five
43status codes defined immediately below. The function's first argument is either
44the result of expansion, or the error message in case of failure. The second
45and third arguments are standard argument count and vector, comprising the
46{arg} values specified in the expansion item. */
47
48typedef int exim_dlfunc_t(uschar **yield, int argc, uschar *argv[]);
49
50
51/* Return codes from the support functions lss_match_xxx(). These are also the
52codes that dynamically-loaded ${dlfunc functions must return. */
53
54#define OK 0 /* Successful match */
55#define DEFER 1 /* Defer - some problem */
56#define FAIL 2 /* Matching failed */
57#define ERROR 3 /* Internal or config error */
58
59/* Extra return code for ${dlfunc functions */
60
61#define FAIL_FORCED 4 /* "Forced" failure */
62
63
64/* Available logging destinations */
65
66#define LOG_MAIN 1 /* Write to the main log */
67#define LOG_PANIC 2 /* Write to the panic log */
68#define LOG_REJECT 16 /* Write to the reject log, with headers */
69
70
71/* Accessible debugging bits */
72
73#define D_v 0x00000001
74#define D_local_scan 0x00000002
75
76
77/* Option types that can be used for local_scan_options. The boolean ones
78MUST be last so that they are contiguous with the internal boolean specials. */
79
80enum { opt_stringptr, opt_int, opt_octint, opt_mkint, opt_Kint, opt_fixed,
81 opt_time, opt_bool };
82
83
84/* The length of message identification strings. This is the id used internally
85by exim. The external version for use in Received: strings has a leading 'E'
86added to ensure it starts with a letter. */
87
88#define MESSAGE_ID_LENGTH 16
89
90/* The offset to the start of the data in the data file - this allows for
91the name of the data file to be present in the first line. */
92
93#define SPOOL_DATA_START_OFFSET (MESSAGE_ID_LENGTH+3)
94
95/* Some people (Marc Merlin et al) are maintaining a patch that allows for
96dynamic local_scan() libraries. This code is not yet in Exim proper, but it
97helps the maintainers if we keep their ABI version numbers here. This may
98mutate into more general support later. The major number is increased when the
99ABI is changed in a non backward compatible way. The minor number is increased
100each time a new feature is added (in a way that doesn't break backward
101compatibility). */
102
103#define LOCAL_SCAN_ABI_VERSION_MAJOR 1
104#define LOCAL_SCAN_ABI_VERSION_MINOR 1
105#define LOCAL_SCAN_ABI_VERSION \
106 LOCAL_SCAN_ABI_VERSION_MAJOR.LOCAL_SCAN_ABI_VERSION_MINOR
107
108/* Structure definitions that are documented as visible in the function. */
109
110typedef struct header_line {
111 struct header_line *next;
112 int type;
113 int slen;
114 uschar *text;
115} header_line;
116
117/* Entries in lists options are in this form. */
118
119typedef struct {
120 const char *name;
121 int type;
122 void *value;
123} optionlist;
124
125/*Structure for holding information about an envelope address. The errors_to
126field is always NULL except for one_time aliases that had errors_to on the
127routers that generated them. */
128
129typedef struct recipient_item {
130 uschar *address; /* the recipient address */
131 int pno; /* parent number for "one_time" alias, or -1 */
132 uschar *errors_to; /* the errors_to address or NULL */
133#ifdef EXPERIMENTAL_BRIGHTMAIL
134 uschar *bmi_optin;
135#endif
136} recipient_item;
137
138
139/* Global variables that are documented as visible in the function. */
140
141extern unsigned int debug_selector; /* Debugging bits */
142
143extern int body_linecount; /* Line count in body */
144extern int body_zerocount; /* Binary zero count in body */
145extern uschar *expand_string_message; /* Error info for failing expansion */
146extern uschar *headers_charset; /* Charset for RFC 2047 decoding */
147extern header_line *header_last; /* Final header */
148extern header_line *header_list; /* First header */
149extern BOOL host_checking; /* Set when checking a host */
150extern uschar *interface_address; /* Interface for incoming call */
151extern int interface_port; /* Port number for incoming call */
152extern uschar *message_id; /* Internal id of message being handled */
153extern uschar *received_protocol; /* Name of incoming protocol */
154extern int recipients_count; /* Number of recipients */
155extern recipient_item *recipients_list;/* List of recipient addresses */
156extern unsigned char *sender_address; /* Sender address */
157extern uschar *sender_host_address; /* IP address of sender, as chars */
158extern uschar *sender_host_authenticated; /* Name of authentication mechanism */
159extern uschar *sender_host_name; /* Host name from lookup */
160extern int sender_host_port; /* Port number of sender */
161extern BOOL smtp_batched_input; /* TRUE if SMTP batch (no interaction) */
162extern BOOL smtp_input; /* TRUE if input is via SMTP */
163
164
165/* Functions that are documented as visible in local_scan(). */
166
167extern int child_close(pid_t, int);
168extern pid_t child_open(uschar **, uschar **, int, int *, int *, BOOL);
169extern pid_t child_open_exim(int *);
170extern pid_t child_open_exim2(int *, uschar *, uschar *);
171extern void debug_printf(const char *, ...) PRINTF_FUNCTION(1,2);
172extern uschar *expand_string(uschar *);
173extern void header_add(int, const char *, ...);
174extern void header_add_at_position(BOOL, uschar *, BOOL, int, const char *, ...);
175extern void header_remove(int, const uschar *);
176extern BOOL header_testname(header_line *, const uschar *, int, BOOL);
177extern BOOL header_testname_incomplete(header_line *, const uschar *, int, BOOL);
178extern void log_write(unsigned int, int, const char *format, ...);
179extern int lss_b64decode(uschar *, uschar **);
180extern uschar *lss_b64encode(uschar *, int);
181extern int lss_match_domain(uschar *, uschar *);
182extern int lss_match_local_part(uschar *, uschar *, BOOL);
183extern int lss_match_address(uschar *, uschar *, BOOL);
184extern int lss_match_host(uschar *, uschar *, uschar *);
185extern void receive_add_recipient(uschar *, int);
186extern BOOL receive_remove_recipient(uschar *);
187extern uschar *rfc2047_decode(uschar *, BOOL, uschar *, int, int *, uschar **);
188extern int smtp_fflush(void);
189extern void smtp_printf(const char *, ...) PRINTF_FUNCTION(1,2);
190extern void smtp_vprintf(const char *, va_list);
191extern uschar *string_copy(uschar *);
192extern uschar *string_copyn(uschar *, int);
193extern uschar *string_sprintf(const char *, ...);
194
195/* End of local_scan.h */
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