| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| |
| #include <errno.h> |
| #include <limits.h> |
| #include <stdarg.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| |
| #include "alloc-util.h" |
| #include "env-util.h" |
| #include "escape.h" |
| #include "extract-word.h" |
| #include "macro.h" |
| #include "parse-util.h" |
| #include "string-util.h" |
| #include "strv.h" |
| #include "utf8.h" |
| |
| /* We follow bash for the character set. Different shells have different rules. */ |
| #define VALID_BASH_ENV_NAME_CHARS \ |
| DIGITS LETTERS \ |
| "_" |
| |
| static bool env_name_is_valid_n(const char *e, size_t n) { |
| const char *p; |
| |
| if (!e) |
| return false; |
| |
| if (n <= 0) |
| return false; |
| |
| if (e[0] >= '0' && e[0] <= '9') |
| return false; |
| |
| /* POSIX says the overall size of the environment block cannot |
| * be > ARG_MAX, an individual assignment hence cannot be |
| * either. Discounting the equal sign and trailing NUL this |
| * hence leaves ARG_MAX-2 as longest possible variable |
| * name. */ |
| if (n > (size_t) sysconf(_SC_ARG_MAX) - 2) |
| return false; |
| |
| for (p = e; p < e + n; p++) |
| if (!strchr(VALID_BASH_ENV_NAME_CHARS, *p)) |
| return false; |
| |
| return true; |
| } |
| |
| bool env_name_is_valid(const char *e) { |
| return env_name_is_valid_n(e, strlen_ptr(e)); |
| } |
| |
| bool env_value_is_valid(const char *e) { |
| if (!e) |
| return false; |
| |
| if (!utf8_is_valid(e)) |
| return false; |
| |
| /* bash allows tabs and newlines in environment variables, and so |
| * should we */ |
| if (string_has_cc(e, "\t\n")) |
| return false; |
| |
| /* POSIX says the overall size of the environment block cannot |
| * be > ARG_MAX, an individual assignment hence cannot be |
| * either. Discounting the shortest possible variable name of |
| * length 1, the equal sign and trailing NUL this hence leaves |
| * ARG_MAX-3 as longest possible variable value. */ |
| if (strlen(e) > sc_arg_max() - 3) |
| return false; |
| |
| return true; |
| } |
| |
| bool env_assignment_is_valid(const char *e) { |
| const char *eq; |
| |
| eq = strchr(e, '='); |
| if (!eq) |
| return false; |
| |
| if (!env_name_is_valid_n(e, eq - e)) |
| return false; |
| |
| if (!env_value_is_valid(eq + 1)) |
| return false; |
| |
| /* POSIX says the overall size of the environment block cannot |
| * be > ARG_MAX, hence the individual variable assignments |
| * cannot be either, but let's leave room for one trailing NUL |
| * byte. */ |
| if (strlen(e) > sc_arg_max() - 1) |
| return false; |
| |
| return true; |
| } |
| |
| bool strv_env_is_valid(char **e) { |
| char **p, **q; |
| |
| STRV_FOREACH(p, e) { |
| size_t k; |
| |
| if (!env_assignment_is_valid(*p)) |
| return false; |
| |
| /* Check if there are duplicate assignments */ |
| k = strcspn(*p, "="); |
| STRV_FOREACH(q, p + 1) |
| if (strneq(*p, *q, k) && (*q)[k] == '=') |
| return false; |
| } |
| |
| return true; |
| } |
| |
| bool strv_env_name_is_valid(char **l) { |
| char **p; |
| |
| STRV_FOREACH(p, l) { |
| if (!env_name_is_valid(*p)) |
| return false; |
| |
| if (strv_contains(p + 1, *p)) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| bool strv_env_name_or_assignment_is_valid(char **l) { |
| char **p; |
| |
| STRV_FOREACH(p, l) { |
| if (!env_assignment_is_valid(*p) && !env_name_is_valid(*p)) |
| return false; |
| |
| if (strv_contains(p + 1, *p)) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| static int env_append(char **r, char ***k, char **a) { |
| assert(r); |
| assert(k); |
| assert(*k >= r); |
| |
| if (!a) |
| return 0; |
| |
| /* Expects the following arguments: 'r' shall point to the beginning of an strv we are going to append to, 'k' |
| * to a pointer pointing to the NULL entry at the end of the same array. 'a' shall point to another strv. |
| * |
| * This call adds every entry of 'a' to 'r', either overriding an existing matching entry, or appending to it. |
| * |
| * This call assumes 'r' has enough pre-allocated space to grow by all of 'a''s items. */ |
| |
| for (; *a; a++) { |
| char **j, *c; |
| size_t n; |
| |
| n = strcspn(*a, "="); |
| if ((*a)[n] == '=') |
| n++; |
| |
| for (j = r; j < *k; j++) |
| if (strneq(*j, *a, n)) |
| break; |
| |
| c = strdup(*a); |
| if (!c) |
| return -ENOMEM; |
| |
| if (j >= *k) { /* Append to the end? */ |
| (*k)[0] = c; |
| (*k)[1] = NULL; |
| (*k)++; |
| } else |
| free_and_replace(*j, c); /* Override existing item */ |
| } |
| |
| return 0; |
| } |
| |
| char **strv_env_merge(size_t n_lists, ...) { |
| _cleanup_strv_free_ char **ret = NULL; |
| size_t n = 0, i; |
| char **l, **k; |
| va_list ap; |
| |
| /* Merges an arbitrary number of environment sets */ |
| |
| va_start(ap, n_lists); |
| for (i = 0; i < n_lists; i++) { |
| l = va_arg(ap, char**); |
| n += strv_length(l); |
| } |
| va_end(ap); |
| |
| ret = new(char*, n+1); |
| if (!ret) |
| return NULL; |
| |
| *ret = NULL; |
| k = ret; |
| |
| va_start(ap, n_lists); |
| for (i = 0; i < n_lists; i++) { |
| l = va_arg(ap, char**); |
| if (env_append(ret, &k, l) < 0) { |
| va_end(ap); |
| return NULL; |
| } |
| } |
| va_end(ap); |
| |
| return TAKE_PTR(ret); |
| } |
| |
| static bool env_match(const char *t, const char *pattern) { |
| assert(t); |
| assert(pattern); |
| |
| /* pattern a matches string a |
| * a matches a= |
| * a matches a=b |
| * a= matches a= |
| * a=b matches a=b |
| * a= does not match a |
| * a=b does not match a= |
| * a=b does not match a |
| * a=b does not match a=c */ |
| |
| if (streq(t, pattern)) |
| return true; |
| |
| if (!strchr(pattern, '=')) { |
| size_t l = strlen(pattern); |
| |
| return strneq(t, pattern, l) && t[l] == '='; |
| } |
| |
| return false; |
| } |
| |
| static bool env_entry_has_name(const char *entry, const char *name) { |
| const char *t; |
| |
| assert(entry); |
| assert(name); |
| |
| t = startswith(entry, name); |
| if (!t) |
| return false; |
| |
| return *t == '='; |
| } |
| |
| char **strv_env_delete(char **x, size_t n_lists, ...) { |
| size_t n, i = 0; |
| char **k, **r; |
| va_list ap; |
| |
| /* Deletes every entry from x that is mentioned in the other |
| * string lists */ |
| |
| n = strv_length(x); |
| |
| r = new(char*, n+1); |
| if (!r) |
| return NULL; |
| |
| STRV_FOREACH(k, x) { |
| size_t v; |
| |
| va_start(ap, n_lists); |
| for (v = 0; v < n_lists; v++) { |
| char **l, **j; |
| |
| l = va_arg(ap, char**); |
| STRV_FOREACH(j, l) |
| if (env_match(*k, *j)) |
| goto skip; |
| } |
| va_end(ap); |
| |
| r[i] = strdup(*k); |
| if (!r[i]) { |
| strv_free(r); |
| return NULL; |
| } |
| |
| i++; |
| continue; |
| |
| skip: |
| va_end(ap); |
| } |
| |
| r[i] = NULL; |
| |
| assert(i <= n); |
| |
| return r; |
| } |
| |
| char **strv_env_unset(char **l, const char *p) { |
| |
| char **f, **t; |
| |
| if (!l) |
| return NULL; |
| |
| assert(p); |
| |
| /* Drops every occurrence of the env var setting p in the |
| * string list. Edits in-place. */ |
| |
| for (f = t = l; *f; f++) { |
| |
| if (env_match(*f, p)) { |
| free(*f); |
| continue; |
| } |
| |
| *(t++) = *f; |
| } |
| |
| *t = NULL; |
| return l; |
| } |
| |
| char **strv_env_unset_many(char **l, ...) { |
| char **f, **t; |
| |
| if (!l) |
| return NULL; |
| |
| /* Like strv_env_unset() but applies many at once. Edits in-place. */ |
| |
| for (f = t = l; *f; f++) { |
| bool found = false; |
| const char *p; |
| va_list ap; |
| |
| va_start(ap, l); |
| |
| while ((p = va_arg(ap, const char*))) { |
| if (env_match(*f, p)) { |
| found = true; |
| break; |
| } |
| } |
| |
| va_end(ap); |
| |
| if (found) { |
| free(*f); |
| continue; |
| } |
| |
| *(t++) = *f; |
| } |
| |
| *t = NULL; |
| return l; |
| } |
| |
| int strv_env_replace(char ***l, char *p) { |
| const char *t, *name; |
| char **f; |
| int r; |
| |
| assert(p); |
| |
| /* Replace first occurrence of the env var or add a new one in the string list. Drop other occurrences. Edits |
| * in-place. Does not copy p. p must be a valid key=value assignment. |
| */ |
| |
| t = strchr(p, '='); |
| if (!t) |
| return -EINVAL; |
| |
| name = strndupa(p, t - p); |
| |
| STRV_FOREACH(f, *l) |
| if (env_entry_has_name(*f, name)) { |
| free_and_replace(*f, p); |
| strv_env_unset(f + 1, *f); |
| return 0; |
| } |
| |
| /* We didn't find a match, we need to append p or create a new strv */ |
| r = strv_push(l, p); |
| if (r < 0) |
| return r; |
| |
| return 1; |
| } |
| |
| char **strv_env_set(char **x, const char *p) { |
| _cleanup_strv_free_ char **ret = NULL; |
| size_t n, m; |
| char **k; |
| |
| /* Overrides the env var setting of p, returns a new copy */ |
| |
| n = strv_length(x); |
| m = n + 2; |
| if (m < n) /* overflow? */ |
| return NULL; |
| |
| ret = new(char*, m); |
| if (!ret) |
| return NULL; |
| |
| *ret = NULL; |
| k = ret; |
| |
| if (env_append(ret, &k, x) < 0) |
| return NULL; |
| |
| if (env_append(ret, &k, STRV_MAKE(p)) < 0) |
| return NULL; |
| |
| return TAKE_PTR(ret); |
| } |
| |
| char *strv_env_get_n(char **l, const char *name, size_t k, unsigned flags) { |
| char **i; |
| |
| assert(name); |
| |
| if (k <= 0) |
| return NULL; |
| |
| STRV_FOREACH_BACKWARDS(i, l) |
| if (strneq(*i, name, k) && |
| (*i)[k] == '=') |
| return *i + k + 1; |
| |
| if (flags & REPLACE_ENV_USE_ENVIRONMENT) { |
| const char *t; |
| |
| t = strndupa(name, k); |
| return getenv(t); |
| }; |
| |
| return NULL; |
| } |
| |
| char *strv_env_get(char **l, const char *name) { |
| assert(name); |
| |
| return strv_env_get_n(l, name, strlen(name), 0); |
| } |
| |
| char **strv_env_clean_with_callback(char **e, void (*invalid_callback)(const char *p, void *userdata), void *userdata) { |
| char **p, **q; |
| int k = 0; |
| |
| STRV_FOREACH(p, e) { |
| size_t n; |
| bool duplicate = false; |
| |
| if (!env_assignment_is_valid(*p)) { |
| if (invalid_callback) |
| invalid_callback(*p, userdata); |
| free(*p); |
| continue; |
| } |
| |
| n = strcspn(*p, "="); |
| STRV_FOREACH(q, p + 1) |
| if (strneq(*p, *q, n) && (*q)[n] == '=') { |
| duplicate = true; |
| break; |
| } |
| |
| if (duplicate) { |
| free(*p); |
| continue; |
| } |
| |
| e[k++] = *p; |
| } |
| |
| if (e) |
| e[k] = NULL; |
| |
| return e; |
| } |
| |
| char *replace_env_n(const char *format, size_t n, char **env, unsigned flags) { |
| enum { |
| WORD, |
| CURLY, |
| VARIABLE, |
| VARIABLE_RAW, |
| TEST, |
| DEFAULT_VALUE, |
| ALTERNATE_VALUE, |
| } state = WORD; |
| |
| const char *e, *word = format, *test_value; |
| char *k; |
| _cleanup_free_ char *r = NULL; |
| size_t i, len; |
| int nest = 0; |
| |
| assert(format); |
| |
| for (e = format, i = 0; *e && i < n; e ++, i ++) |
| switch (state) { |
| |
| case WORD: |
| if (*e == '$') |
| state = CURLY; |
| break; |
| |
| case CURLY: |
| if (*e == '{') { |
| k = strnappend(r, word, e-word-1); |
| if (!k) |
| return NULL; |
| |
| free_and_replace(r, k); |
| |
| word = e-1; |
| state = VARIABLE; |
| nest++; |
| } else if (*e == '$') { |
| k = strnappend(r, word, e-word); |
| if (!k) |
| return NULL; |
| |
| free_and_replace(r, k); |
| |
| word = e+1; |
| state = WORD; |
| |
| } else if (flags & REPLACE_ENV_ALLOW_BRACELESS && strchr(VALID_BASH_ENV_NAME_CHARS, *e)) { |
| k = strnappend(r, word, e-word-1); |
| if (!k) |
| return NULL; |
| |
| free_and_replace(r, k); |
| |
| word = e-1; |
| state = VARIABLE_RAW; |
| |
| } else |
| state = WORD; |
| break; |
| |
| case VARIABLE: |
| if (*e == '}') { |
| const char *t; |
| |
| t = strv_env_get_n(env, word+2, e-word-2, flags); |
| |
| k = strjoin(r, t); |
| if (!k) |
| return NULL; |
| |
| free_and_replace(r, k); |
| |
| word = e+1; |
| state = WORD; |
| } else if (*e == ':') { |
| if (!(flags & REPLACE_ENV_ALLOW_EXTENDED)) |
| /* Treat this as unsupported syntax, i.e. do no replacement */ |
| state = WORD; |
| else { |
| len = e-word-2; |
| state = TEST; |
| } |
| } |
| break; |
| |
| case TEST: |
| if (*e == '-') |
| state = DEFAULT_VALUE; |
| else if (*e == '+') |
| state = ALTERNATE_VALUE; |
| else { |
| state = WORD; |
| break; |
| } |
| |
| test_value = e+1; |
| break; |
| |
| case DEFAULT_VALUE: /* fall through */ |
| case ALTERNATE_VALUE: |
| assert(flags & REPLACE_ENV_ALLOW_EXTENDED); |
| |
| if (*e == '{') { |
| nest++; |
| break; |
| } |
| |
| if (*e != '}') |
| break; |
| |
| nest--; |
| if (nest == 0) { |
| const char *t; |
| _cleanup_free_ char *v = NULL; |
| |
| t = strv_env_get_n(env, word+2, len, flags); |
| |
| if (t && state == ALTERNATE_VALUE) |
| t = v = replace_env_n(test_value, e-test_value, env, flags); |
| else if (!t && state == DEFAULT_VALUE) |
| t = v = replace_env_n(test_value, e-test_value, env, flags); |
| |
| k = strjoin(r, t); |
| if (!k) |
| return NULL; |
| |
| free_and_replace(r, k); |
| |
| word = e+1; |
| state = WORD; |
| } |
| break; |
| |
| case VARIABLE_RAW: |
| assert(flags & REPLACE_ENV_ALLOW_BRACELESS); |
| |
| if (!strchr(VALID_BASH_ENV_NAME_CHARS, *e)) { |
| const char *t; |
| |
| t = strv_env_get_n(env, word+1, e-word-1, flags); |
| |
| k = strjoin(r, t); |
| if (!k) |
| return NULL; |
| |
| free_and_replace(r, k); |
| |
| word = e--; |
| i--; |
| state = WORD; |
| } |
| break; |
| } |
| |
| if (state == VARIABLE_RAW) { |
| const char *t; |
| |
| assert(flags & REPLACE_ENV_ALLOW_BRACELESS); |
| |
| t = strv_env_get_n(env, word+1, e-word-1, flags); |
| return strjoin(r, t); |
| } else |
| return strnappend(r, word, e-word); |
| } |
| |
| char **replace_env_argv(char **argv, char **env) { |
| char **ret, **i; |
| size_t k = 0, l = 0; |
| |
| l = strv_length(argv); |
| |
| ret = new(char*, l+1); |
| if (!ret) |
| return NULL; |
| |
| STRV_FOREACH(i, argv) { |
| |
| /* If $FOO appears as single word, replace it by the split up variable */ |
| if ((*i)[0] == '$' && !IN_SET((*i)[1], '{', '$')) { |
| char *e; |
| char **w, **m = NULL; |
| size_t q; |
| |
| e = strv_env_get(env, *i+1); |
| if (e) { |
| int r; |
| |
| r = strv_split_full(&m, e, WHITESPACE, EXTRACT_RELAX|EXTRACT_UNQUOTE); |
| if (r < 0) { |
| ret[k] = NULL; |
| strv_free(ret); |
| return NULL; |
| } |
| } else |
| m = NULL; |
| |
| q = strv_length(m); |
| l = l + q - 1; |
| |
| w = reallocarray(ret, l + 1, sizeof(char *)); |
| if (!w) { |
| ret[k] = NULL; |
| strv_free(ret); |
| strv_free(m); |
| return NULL; |
| } |
| |
| ret = w; |
| if (m) { |
| memcpy(ret + k, m, q * sizeof(char*)); |
| free(m); |
| } |
| |
| k += q; |
| continue; |
| } |
| |
| /* If ${FOO} appears as part of a word, replace it by the variable as-is */ |
| ret[k] = replace_env(*i, env, 0); |
| if (!ret[k]) { |
| strv_free(ret); |
| return NULL; |
| } |
| k++; |
| } |
| |
| ret[k] = NULL; |
| return ret; |
| } |
| |
| int getenv_bool(const char *p) { |
| const char *e; |
| |
| e = getenv(p); |
| if (!e) |
| return -ENXIO; |
| |
| return parse_boolean(e); |
| } |
| |
| int getenv_bool_secure(const char *p) { |
| const char *e; |
| |
| e = secure_getenv(p); |
| if (!e) |
| return -ENXIO; |
| |
| return parse_boolean(e); |
| } |
| |
| int set_unset_env(const char *name, const char *value, bool overwrite) { |
| int r; |
| |
| if (value) |
| r = setenv(name, value, overwrite); |
| else |
| r = unsetenv(name); |
| if (r < 0) |
| return -errno; |
| return 0; |
| } |