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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 12:06:34 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 12:06:34 +0000 |
commit | 5e61585d76ae77fd5e9e96ebabb57afa4d74880d (patch) | |
tree | 2b467823aaeebc7ef8bc9e3cabe8074eaef1666d /src/postconf/postconf_edit.c | |
parent | Initial commit. (diff) | |
download | postfix-upstream/3.5.24.tar.xz postfix-upstream/3.5.24.zip |
Adding upstream version 3.5.24.upstream/3.5.24upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/postconf/postconf_edit.c')
-rw-r--r-- | src/postconf/postconf_edit.c | 625 |
1 files changed, 625 insertions, 0 deletions
diff --git a/src/postconf/postconf_edit.c b/src/postconf/postconf_edit.c new file mode 100644 index 0000000..2f9a607 --- /dev/null +++ b/src/postconf/postconf_edit.c @@ -0,0 +1,625 @@ +/*++ +/* NAME +/* postconf_edit 3 +/* SUMMARY +/* edit main.cf or master.cf +/* SYNOPSIS +/* #include <postconf.h> +/* +/* void pcf_edit_main(mode, argc, argv) +/* int mode; +/* int argc; +/* char **argv; +/* +/* void pcf_edit_master(mode, argc, argv) +/* int mode; +/* int argc; +/* char **argv; +/* DESCRIPTION +/* pcf_edit_main() edits the \fBmain.cf\fR configuration file. +/* It replaces or adds parameter settings given as "\fIname=value\fR" +/* pairs given on the command line, or removes parameter +/* settings given as "\fIname\fR" on the command line. The +/* file is copied to a temporary file then renamed into place. +/* +/* pcf_edit_master() edits the \fBmaster.cf\fR configuration +/* file. The file is copied to a temporary file then renamed +/* into place. Depending on the flags in \fBmode\fR: +/* .IP PCF_MASTER_ENTRY +/* With PCF_EDIT_CONF, pcf_edit_master() replaces or adds +/* entire master.cf entries, specified on the command line as +/* "\fIname/type = name type private unprivileged chroot wakeup +/* process_limit command...\fR". +/* +/* With PCF_EDIT_EXCL or PCF_COMMENT_OUT, pcf_edit_master() +/* removes or comments out entries specified on the command +/* line as "\fIname/type\fR. +/* .IP PCF_MASTER_FLD +/* With PCF_EDIT_CONF, pcf_edit_master() replaces the value +/* of specific service attributes, specified on the command +/* line as "\fIname/type/attribute = value\fR". +/* .IP PCF_MASTER_PARAM +/* With PCF_EDIT_CONF, pcf_edit_master() replaces or adds the +/* value of service parameters, specified on the command line +/* as "\fIname/type/parameter = value\fR". +/* +/* With PCF_EDIT_EXCL, pcf_edit_master() removes service +/* parameters specified on the command line as "\fIparametername\fR". +/* DIAGNOSTICS +/* Problems are reported to the standard error stream. +/* FILES +/* /etc/postfix/main.cf, Postfix configuration parameters +/* /etc/postfix/main.cf.tmp, temporary name +/* /etc/postfix/master.cf, Postfix configuration parameters +/* /etc/postfix/master.cf.tmp, temporary name +/* LICENSE +/* .ad +/* .fi +/* The Secure Mailer license must be distributed with this software. +/* AUTHOR(S) +/* Wietse Venema +/* IBM T.J. Watson Research +/* P.O. Box 704 +/* Yorktown Heights, NY 10598, USA +/*--*/ + +/* System library. */ + +#include <sys_defs.h> +#include <string.h> +#include <ctype.h> + +/* Utility library. */ + +#include <msg.h> +#include <mymalloc.h> +#include <htable.h> +#include <vstring.h> +#include <vstring_vstream.h> +#include <edit_file.h> +#include <readlline.h> +#include <stringops.h> +#include <split_at.h> + +/* Global library. */ + +#include <mail_params.h> + +/* Application-specific. */ + +#include <postconf.h> + +#define STR(x) vstring_str(x) + +/* pcf_find_cf_info - pass-through non-content line, return content or null */ + +static char *pcf_find_cf_info(VSTRING *buf, VSTREAM *dst) +{ + char *cp; + + for (cp = STR(buf); ISSPACE(*cp) /* including newline */ ; cp++) + /* void */ ; + /* Pass-through comment, all-whitespace, or empty line. */ + if (*cp == '#' || *cp == 0) { + vstream_fputs(STR(buf), dst); + return (0); + } else { + return (cp); + } +} + +/* pcf_next_cf_line - return next content line, pass non-content */ + +static char *pcf_next_cf_line(VSTRING *buf, VSTREAM *src, VSTREAM *dst, int *lineno) +{ + char *cp; + + while (vstring_get(buf, src) != VSTREAM_EOF) { + if (lineno) + *lineno += 1; + if ((cp = pcf_find_cf_info(buf, dst)) != 0) + return (cp); + } + return (0); +} + +/* pcf_gobble_cf_line - accumulate multi-line content, pass non-content */ + +static void pcf_gobble_cf_line(VSTRING *full_entry_buf, VSTRING *line_buf, + VSTREAM *src, VSTREAM *dst, int *lineno) +{ + int ch; + + vstring_strcpy(full_entry_buf, STR(line_buf)); + for (;;) { + if ((ch = VSTREAM_GETC(src)) != VSTREAM_EOF) + vstream_ungetc(src, ch); + if ((ch != '#' && !ISSPACE(ch)) + || vstring_get(line_buf, src) == VSTREAM_EOF) + break; + lineno += 1; + if (pcf_find_cf_info(line_buf, dst)) + vstring_strcat(full_entry_buf, STR(line_buf)); + } +} + +/* pcf_edit_main - edit main.cf file */ + +void pcf_edit_main(int mode, int argc, char **argv) +{ + char *path; + EDIT_FILE *ep; + VSTREAM *src; + VSTREAM *dst; + VSTRING *buf = vstring_alloc(100); + VSTRING *key = vstring_alloc(10); + char *cp; + char *pattern; + char *edit_value; + HTABLE *table; + struct cvalue { + char *value; + int found; + }; + struct cvalue *cvalue; + HTABLE_INFO **ht_info; + HTABLE_INFO **ht; + int interesting; + const char *err; + + /* + * Store command-line parameters for quick lookup. + */ + table = htable_create(argc); + while ((cp = *argv++) != 0) { + if (strchr(cp, '\n') != 0) + msg_fatal("-e, -X, or -# accepts no multi-line input"); + while (ISSPACE(*cp)) + cp++; + if (*cp == '#') + msg_fatal("-e, -X, or -# accepts no comment input"); + if (mode & PCF_EDIT_CONF) { + if ((err = split_nameval(cp, &pattern, &edit_value)) != 0) + msg_fatal("%s: \"%s\"", err, cp); + } else if (mode & (PCF_COMMENT_OUT | PCF_EDIT_EXCL)) { + if (*cp == 0) + msg_fatal("-X or -# requires non-blank parameter names"); + if (strchr(cp, '=') != 0) + msg_fatal("-X or -# requires parameter names without value"); + pattern = cp; + trimblanks(pattern, 0); + edit_value = 0; + } else { + msg_panic("pcf_edit_main: unknown mode %d", mode); + } + if ((cvalue = htable_find(table, pattern)) != 0) { + msg_warn("ignoring earlier request: '%s = %s'", + pattern, cvalue->value); + htable_delete(table, pattern, myfree); + } + cvalue = (struct cvalue *) mymalloc(sizeof(*cvalue)); + cvalue->value = edit_value; + cvalue->found = 0; + htable_enter(table, pattern, (void *) cvalue); + } + + /* + * Open a temp file for the result. This uses a deterministic name so we + * don't leave behind thrash with random names. + */ + pcf_set_config_dir(); + path = concatenate(var_config_dir, "/", MAIN_CONF_FILE, (char *) 0); + if ((ep = edit_file_open(path, O_CREAT | O_WRONLY, 0644)) == 0) + msg_fatal("open %s%s: %m", path, EDIT_FILE_SUFFIX); + dst = ep->tmp_fp; + + /* + * Open the original file for input. + */ + if ((src = vstream_fopen(path, O_RDONLY, 0)) == 0) { + /* OK to delete, since we control the temp file name exclusively. */ + (void) unlink(ep->tmp_path); + msg_fatal("open %s for reading: %m", path); + } + + /* + * Copy original file to temp file, while replacing parameters on the + * fly. Issue warnings for names found multiple times. + */ +#define STR(x) vstring_str(x) + + interesting = 0; + while ((cp = pcf_next_cf_line(buf, src, dst, (int *) 0)) != 0) { + /* Copy, skip or replace continued text. */ + if (cp > STR(buf)) { + if (interesting == 0) + vstream_fputs(STR(buf), dst); + else if (mode & PCF_COMMENT_OUT) + vstream_fprintf(dst, "#%s", STR(buf)); + } + /* Copy or replace start of logical line. */ + else { + vstring_strncpy(key, cp, strcspn(cp, CHARS_SPACE "=")); + cvalue = (struct cvalue *) htable_find(table, STR(key)); + if ((interesting = !!cvalue) != 0) { + if (cvalue->found++ == 1) + msg_warn("%s: multiple entries for \"%s\"", path, STR(key)); + if (mode & PCF_EDIT_CONF) + vstream_fprintf(dst, "%s = %s\n", STR(key), cvalue->value); + else if (mode & PCF_COMMENT_OUT) + vstream_fprintf(dst, "#%s", cp); + } else { + vstream_fputs(STR(buf), dst); + } + } + } + + /* + * Generate new entries for parameters that were not found. + */ + if (mode & PCF_EDIT_CONF) { + for (ht_info = ht = htable_list(table); *ht; ht++) { + cvalue = (struct cvalue *) ht[0]->value; + if (cvalue->found == 0) + vstream_fprintf(dst, "%s = %s\n", ht[0]->key, cvalue->value); + } + myfree((void *) ht_info); + } + + /* + * When all is well, rename the temp file to the original one. + */ + if (vstream_fclose(src)) + msg_fatal("read %s: %m", path); + if (edit_file_close(ep) != 0) + msg_fatal("close %s%s: %m", path, EDIT_FILE_SUFFIX); + + /* + * Cleanup. + */ + myfree(path); + vstring_free(buf); + vstring_free(key); + htable_free(table, myfree); +} + + /* + * Data structure to hold a master.cf edit request. + */ +typedef struct { + int match_count; /* hit count */ + const char *raw_text; /* unparsed command-line argument */ + char *parsed_text; /* destructive parse */ + ARGV *service_pattern; /* service name, type, ... */ + int field_number; /* attribute field number */ + const char *param_pattern; /* parameter name */ + char *edit_value; /* value substring */ +} PCF_MASTER_EDIT_REQ; + +/* pcf_edit_master - edit master.cf file */ + +void pcf_edit_master(int mode, int argc, char **argv) +{ + const char *myname = "pcf_edit_master"; + char *path; + EDIT_FILE *ep; + VSTREAM *src; + VSTREAM *dst; + VSTRING *line_buf = vstring_alloc(100); + VSTRING *parse_buf = vstring_alloc(100); + int lineno; + PCF_MASTER_ENT *new_entry; + VSTRING *full_entry_buf = vstring_alloc(100); + char *cp; + char *pattern; + int service_name_type_matched; + const char *err; + PCF_MASTER_EDIT_REQ *edit_reqs; + PCF_MASTER_EDIT_REQ *req; + int num_reqs = argc; + const char *edit_opts = "-Me, -Fe, -Pe, -X, or -#"; + char *service_name; + char *service_type; + + /* + * Sanity check. + */ + if (num_reqs <= 0) + msg_panic("%s: empty argument list", myname); + + /* + * Preprocessing: split pattern=value, then split the pattern components. + */ + edit_reqs = (PCF_MASTER_EDIT_REQ *) mymalloc(sizeof(*edit_reqs) * num_reqs); + for (req = edit_reqs; *argv != 0; req++, argv++) { + req->match_count = 0; + req->raw_text = *argv; + cp = req->parsed_text = mystrdup(req->raw_text); + if (strchr(cp, '\n') != 0) + msg_fatal("%s accept no multi-line input", edit_opts); + while (ISSPACE(*cp)) + cp++; + if (*cp == '#') + msg_fatal("%s accept no comment input", edit_opts); + /* Separate the pattern from the value. */ + if (mode & PCF_EDIT_CONF) { + if ((err = split_nameval(cp, &pattern, &req->edit_value)) != 0) + msg_fatal("%s: \"%s\"", err, req->raw_text); +#if 0 + if ((mode & PCF_MASTER_PARAM) + && req->edit_value[strcspn(req->edit_value, PCF_MASTER_BLANKS)]) + msg_fatal("whitespace in parameter value: \"%s\"", + req->raw_text); +#endif + } else if (mode & (PCF_COMMENT_OUT | PCF_EDIT_EXCL)) { + if (strchr(cp, '=') != 0) + msg_fatal("-X or -# requires names without value"); + pattern = cp; + trimblanks(pattern, 0); + req->edit_value = 0; + } else { + msg_panic("%s: unknown mode %d", myname, mode); + } + +#define PCF_MASTER_MASK (PCF_MASTER_ENTRY | PCF_MASTER_FLD | PCF_MASTER_PARAM) + + /* + * Split name/type or name/type/whatever pattern into components. + */ + switch (mode & PCF_MASTER_MASK) { + case PCF_MASTER_ENTRY: + if ((req->service_pattern = + pcf_parse_service_pattern(pattern, 2, 2)) == 0) + msg_fatal("-Me, -MX or -M# requires service_name/type"); + break; + case PCF_MASTER_FLD: + if ((req->service_pattern = + pcf_parse_service_pattern(pattern, 3, 3)) == 0) + msg_fatal("-Fe or -FX requires service_name/type/field_name"); + req->field_number = + pcf_parse_field_pattern(req->service_pattern->argv[2]); + if (pcf_is_magic_field_pattern(req->field_number)) + msg_fatal("-Fe does not accept wild-card field name"); + if ((mode & PCF_EDIT_CONF) + && req->field_number < PCF_MASTER_FLD_CMD + && req->edit_value[strcspn(req->edit_value, PCF_MASTER_BLANKS)]) + msg_fatal("-Fe does not accept whitespace in non-command field"); + break; + case PCF_MASTER_PARAM: + if ((req->service_pattern = + pcf_parse_service_pattern(pattern, 3, 3)) == 0) + msg_fatal("-Pe or -PX requires service_name/type/parameter"); + req->param_pattern = req->service_pattern->argv[2]; + if (PCF_IS_MAGIC_PARAM_PATTERN(req->param_pattern)) + msg_fatal("-Pe does not accept wild-card parameter name"); + if ((mode & PCF_EDIT_CONF) + && req->edit_value[strcspn(req->edit_value, PCF_MASTER_BLANKS)]) + msg_fatal("-Pe does not accept whitespace in parameter value"); + break; + default: + msg_panic("%s: unknown edit mode %d", myname, mode); + } + } + + /* + * Open a temp file for the result. This uses a deterministic name so we + * don't leave behind thrash with random names. + */ + pcf_set_config_dir(); + path = concatenate(var_config_dir, "/", MASTER_CONF_FILE, (char *) 0); + if ((ep = edit_file_open(path, O_CREAT | O_WRONLY, 0644)) == 0) + msg_fatal("open %s%s: %m", path, EDIT_FILE_SUFFIX); + dst = ep->tmp_fp; + + /* + * Open the original file for input. + */ + if ((src = vstream_fopen(path, O_RDONLY, 0)) == 0) { + /* OK to delete, since we control the temp file name exclusively. */ + (void) unlink(ep->tmp_path); + msg_fatal("open %s for reading: %m", path); + } + + /* + * Copy original file to temp file, while replacing service entries on + * the fly. + */ + service_name_type_matched = 0; + new_entry = 0; + lineno = 0; + while ((cp = pcf_next_cf_line(parse_buf, src, dst, &lineno)) != 0) { + vstring_strcpy(line_buf, STR(parse_buf)); + + /* + * Copy, skip or replace continued text. + */ + if (cp > STR(parse_buf)) { + if (service_name_type_matched == 0) + vstream_fputs(STR(line_buf), dst); + else if (mode & PCF_COMMENT_OUT) + vstream_fprintf(dst, "#%s", STR(line_buf)); + } + + /* + * Copy or replace (start of) logical line. + */ + else { + service_name_type_matched = 0; + + /* + * Parse out the service name and type. + */ + if ((service_name = mystrtok(&cp, PCF_MASTER_BLANKS)) == 0 + || (service_type = mystrtok(&cp, PCF_MASTER_BLANKS)) == 0) + msg_fatal("file %s: line %d: specify service name and type " + "on the same line", path, lineno); + if (strchr(service_name, '=')) + msg_fatal("file %s: line %d: service name syntax \"%s\" is " + "unsupported with %s", path, lineno, service_name, + edit_opts); + if (service_type[strcspn(service_type, "=/")] != 0) + msg_fatal("file %s: line %d: " + "service type syntax \"%s\" is unsupported with %s", + path, lineno, service_type, edit_opts); + + /* + * Match each service pattern. + * + * Additional care is needed when a request adds or replaces an + * entire service definition, instead of a specific field or + * parameter. Given a command "postconf -M name1/type1='name2 + * type2 ...'", where name1 and name2 may differ, and likewise + * for type1 and type2: + * + * - First, if an existing service definition a) matches the service + * pattern 'name1/type1', or b) matches the name and type in the + * new service definition 'name2 type2 ...', remove the service + * definition. + * + * - Then, after an a) or b) type match, add a new service + * definition for 'name2 type2 ...', but only after the first + * match. + * + * - Finally, if a request had no a) or b) type match for any + * master.cf service definition, add a new service definition for + * 'name2 type2 ...'. + */ + for (req = edit_reqs; req < edit_reqs + num_reqs; req++) { + PCF_MASTER_ENT *tentative_entry = 0; + int use_tentative_entry = 0; + + /* Additional care for whole service definition requests. */ + if ((mode & PCF_MASTER_ENTRY) && (mode & PCF_EDIT_CONF)) { + tentative_entry = (PCF_MASTER_ENT *) + mymalloc(sizeof(*tentative_entry)); + if ((err = pcf_parse_master_entry(tentative_entry, + req->edit_value)) != 0) + msg_fatal("%s: \"%s\"", err, req->raw_text); + } + if (PCF_MATCH_SERVICE_PATTERN(req->service_pattern, + service_name, + service_type)) { + service_name_type_matched = 1; /* Sticky flag */ + req->match_count += 1; + + /* + * Generate replacement master.cf entries. + */ + if ((mode & PCF_EDIT_CONF) + || ((mode & PCF_MASTER_PARAM) && (mode & PCF_EDIT_EXCL))) { + switch (mode & PCF_MASTER_MASK) { + + /* + * Replace master.cf entry field or parameter + * value. + */ + case PCF_MASTER_FLD: + case PCF_MASTER_PARAM: + if (new_entry == 0) { + /* Gobble up any continuation lines. */ + pcf_gobble_cf_line(full_entry_buf, line_buf, + src, dst, &lineno); + new_entry = (PCF_MASTER_ENT *) + mymalloc(sizeof(*new_entry)); + if ((err = pcf_parse_master_entry(new_entry, + STR(full_entry_buf))) != 0) + msg_fatal("file %s: line %d: %s", + path, lineno, err); + } + if (mode & PCF_MASTER_FLD) { + pcf_edit_master_field(new_entry, + req->field_number, + req->edit_value); + } else { + pcf_edit_master_param(new_entry, mode, + req->param_pattern, + req->edit_value); + } + break; + + /* + * Replace entire master.cf entry. + */ + case PCF_MASTER_ENTRY: + if (req->match_count == 1) + use_tentative_entry = 1; + break; + default: + msg_panic("%s: unknown edit mode %d", myname, mode); + } + } + } else if (tentative_entry != 0 + && PCF_MATCH_SERVICE_PATTERN(tentative_entry->argv, + service_name, + service_type)) { + service_name_type_matched = 1; /* Sticky flag */ + req->match_count += 1; + if (req->match_count == 1) + use_tentative_entry = 1; + } + if (tentative_entry != 0) { + if (use_tentative_entry) { + if (new_entry != 0) + pcf_free_master_entry(new_entry); + new_entry = tentative_entry; + } else { + pcf_free_master_entry(tentative_entry); + } + } + } + + /* + * Pass through or replace the current input line. + */ + if (new_entry) { + pcf_print_master_entry(dst, PCF_FOLD_LINE, new_entry); + pcf_free_master_entry(new_entry); + new_entry = 0; + } else if (service_name_type_matched == 0) { + vstream_fputs(STR(line_buf), dst); + } else if (mode & PCF_COMMENT_OUT) { + vstream_fprintf(dst, "#%s", STR(line_buf)); + } + } + } + + /* + * Postprocessing: when editing entire service entries, generate new + * entries for services not found. Otherwise (editing fields or + * parameters), "service not found" is a fatal error. + */ + for (req = edit_reqs; req < edit_reqs + num_reqs; req++) { + if (req->match_count == 0) { + if ((mode & PCF_MASTER_ENTRY) && (mode & PCF_EDIT_CONF)) { + new_entry = (PCF_MASTER_ENT *) mymalloc(sizeof(*new_entry)); + if ((err = pcf_parse_master_entry(new_entry, req->edit_value)) != 0) + msg_fatal("%s: \"%s\"", err, req->raw_text); + pcf_print_master_entry(dst, PCF_FOLD_LINE, new_entry); + pcf_free_master_entry(new_entry); + } else if ((mode & PCF_MASTER_ENTRY) == 0) { + msg_warn("unmatched service_name/type: \"%s\"", req->raw_text); + } + } + } + + /* + * When all is well, rename the temp file to the original one. + */ + if (vstream_fclose(src)) + msg_fatal("read %s: %m", path); + if (edit_file_close(ep) != 0) + msg_fatal("close %s%s: %m", path, EDIT_FILE_SUFFIX); + + /* + * Cleanup. + */ + myfree(path); + vstring_free(line_buf); + vstring_free(parse_buf); + vstring_free(full_entry_buf); + for (req = edit_reqs; req < edit_reqs + num_reqs; req++) { + argv_free(req->service_pattern); + myfree(req->parsed_text); + } + myfree((void *) edit_reqs); +} |