1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/compiler.h> 2 #include <linux/compiler.h>
3 #include <linux/string.h> 3 #include <linux/string.h>
4 #include <sys/types.h> 4 #include <sys/types.h>
5 #include <sys/stat.h> 5 #include <sys/stat.h>
6 #include <unistd.h> 6 #include <unistd.h>
7 #include <string.h> 7 #include <string.h>
8 #include <stdlib.h> 8 #include <stdlib.h>
9 #include <stdio.h> 9 #include <stdio.h>
10 #include "subcmd-util.h" 10 #include "subcmd-util.h"
11 #include "exec-cmd.h" 11 #include "exec-cmd.h"
12 #include "subcmd-config.h" 12 #include "subcmd-config.h"
13 13
14 #define MAX_ARGS 32 14 #define MAX_ARGS 32
15 #define PATH_MAX 4096 15 #define PATH_MAX 4096
16 16
17 static const char *argv_exec_path; 17 static const char *argv_exec_path;
18 static const char *argv0_path; 18 static const char *argv0_path;
19 19
20 void exec_cmd_init(const char *exec_name, cons 20 void exec_cmd_init(const char *exec_name, const char *prefix,
21 const char *exec_path, cons 21 const char *exec_path, const char *exec_path_env)
22 { 22 {
23 subcmd_config.exec_name = exec 23 subcmd_config.exec_name = exec_name;
24 subcmd_config.prefix = pref 24 subcmd_config.prefix = prefix;
25 subcmd_config.exec_path = exec 25 subcmd_config.exec_path = exec_path;
26 subcmd_config.exec_path_env = exec 26 subcmd_config.exec_path_env = exec_path_env;
27 <<
28 /* Setup environment variable for invo <<
29 setenv("PREFIX", prefix, 1); <<
30 } 27 }
31 28
32 #define is_dir_sep(c) ((c) == '/') 29 #define is_dir_sep(c) ((c) == '/')
33 30
34 static int is_absolute_path(const char *path) 31 static int is_absolute_path(const char *path)
35 { 32 {
36 return path[0] == '/'; 33 return path[0] == '/';
37 } 34 }
38 35
39 static const char *get_pwd_cwd(char *buf, size !! 36 static const char *get_pwd_cwd(void)
40 { 37 {
>> 38 static char cwd[PATH_MAX + 1];
41 char *pwd; 39 char *pwd;
42 struct stat cwd_stat, pwd_stat; 40 struct stat cwd_stat, pwd_stat;
43 if (getcwd(buf, sz) == NULL) !! 41 if (getcwd(cwd, PATH_MAX) == NULL)
44 return NULL; 42 return NULL;
45 pwd = getenv("PWD"); 43 pwd = getenv("PWD");
46 if (pwd && strcmp(pwd, buf)) { !! 44 if (pwd && strcmp(pwd, cwd)) {
47 stat(buf, &cwd_stat); !! 45 stat(cwd, &cwd_stat);
48 if (!stat(pwd, &pwd_stat) && 46 if (!stat(pwd, &pwd_stat) &&
49 pwd_stat.st_dev == cwd_sta 47 pwd_stat.st_dev == cwd_stat.st_dev &&
50 pwd_stat.st_ino == cwd_sta 48 pwd_stat.st_ino == cwd_stat.st_ino) {
51 strlcpy(buf, pwd, sz); !! 49 strlcpy(cwd, pwd, PATH_MAX);
52 } 50 }
53 } 51 }
54 return buf; !! 52 return cwd;
55 } 53 }
56 54
57 static const char *make_nonrelative_path(char !! 55 static const char *make_nonrelative_path(const char *path)
58 { 56 {
>> 57 static char buf[PATH_MAX + 1];
>> 58
59 if (is_absolute_path(path)) { 59 if (is_absolute_path(path)) {
60 if (strlcpy(buf, path, sz) >= !! 60 if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
61 die("Too long path: %. 61 die("Too long path: %.*s", 60, path);
62 } else { 62 } else {
63 const char *cwd = get_pwd_cwd( !! 63 const char *cwd = get_pwd_cwd();
64 <<
65 if (!cwd) 64 if (!cwd)
66 die("Cannot determine 65 die("Cannot determine the current working directory");
67 !! 66 if (snprintf(buf, PATH_MAX, "%s/%s", cwd, path) >= PATH_MAX)
68 if (strlen(cwd) + strlen(path) <<
69 die("Too long path: %. 67 die("Too long path: %.*s", 60, path);
70 <<
71 strcat(buf, "/"); <<
72 strcat(buf, path); <<
73 } 68 }
74 return buf; 69 return buf;
75 } 70 }
76 71
77 char *system_path(const char *path) 72 char *system_path(const char *path)
78 { 73 {
79 char *buf = NULL; 74 char *buf = NULL;
80 75
81 if (is_absolute_path(path)) 76 if (is_absolute_path(path))
82 return strdup(path); 77 return strdup(path);
83 78
84 astrcatf(&buf, "%s/%s", subcmd_config. 79 astrcatf(&buf, "%s/%s", subcmd_config.prefix, path);
85 80
86 return buf; 81 return buf;
87 } 82 }
88 83
89 const char *extract_argv0_path(const char *arg 84 const char *extract_argv0_path(const char *argv0)
90 { 85 {
91 const char *slash; 86 const char *slash;
92 87
93 if (!argv0 || !*argv0) 88 if (!argv0 || !*argv0)
94 return NULL; 89 return NULL;
95 slash = argv0 + strlen(argv0); 90 slash = argv0 + strlen(argv0);
96 91
97 while (argv0 <= slash && !is_dir_sep(* 92 while (argv0 <= slash && !is_dir_sep(*slash))
98 slash--; 93 slash--;
99 94
100 if (slash >= argv0) { 95 if (slash >= argv0) {
101 argv0_path = strndup(argv0, sl 96 argv0_path = strndup(argv0, slash - argv0);
102 return argv0_path ? slash + 1 97 return argv0_path ? slash + 1 : NULL;
103 } 98 }
104 99
105 return argv0; 100 return argv0;
106 } 101 }
107 102
108 void set_argv_exec_path(const char *exec_path) 103 void set_argv_exec_path(const char *exec_path)
109 { 104 {
110 argv_exec_path = exec_path; 105 argv_exec_path = exec_path;
111 /* 106 /*
112 * Propagate this setting to external 107 * Propagate this setting to external programs.
113 */ 108 */
114 setenv(subcmd_config.exec_path_env, ex 109 setenv(subcmd_config.exec_path_env, exec_path, 1);
115 } 110 }
116 111
117 112
118 /* Returns the highest-priority location to lo 113 /* Returns the highest-priority location to look for subprograms. */
119 char *get_argv_exec_path(void) 114 char *get_argv_exec_path(void)
120 { 115 {
121 char *env; 116 char *env;
122 117
123 if (argv_exec_path) 118 if (argv_exec_path)
124 return strdup(argv_exec_path); 119 return strdup(argv_exec_path);
125 120
126 env = getenv(subcmd_config.exec_path_e 121 env = getenv(subcmd_config.exec_path_env);
127 if (env && *env) 122 if (env && *env)
128 return strdup(env); 123 return strdup(env);
129 124
130 return system_path(subcmd_config.exec_ 125 return system_path(subcmd_config.exec_path);
131 } 126 }
132 127
133 static void add_path(char **out, const char *p 128 static void add_path(char **out, const char *path)
134 { 129 {
135 if (path && *path) { 130 if (path && *path) {
136 if (is_absolute_path(path)) 131 if (is_absolute_path(path))
137 astrcat(out, path); 132 astrcat(out, path);
138 else { !! 133 else
139 char buf[PATH_MAX]; !! 134 astrcat(out, make_nonrelative_path(path));
140 <<
141 astrcat(out, make_nonr <<
142 } <<
143 135
144 astrcat(out, ":"); 136 astrcat(out, ":");
145 } 137 }
146 } 138 }
147 139
148 void setup_path(void) 140 void setup_path(void)
149 { 141 {
150 const char *old_path = getenv("PATH"); 142 const char *old_path = getenv("PATH");
151 char *new_path = NULL; 143 char *new_path = NULL;
152 char *tmp = get_argv_exec_path(); 144 char *tmp = get_argv_exec_path();
153 145
154 add_path(&new_path, tmp); 146 add_path(&new_path, tmp);
155 add_path(&new_path, argv0_path); 147 add_path(&new_path, argv0_path);
156 free(tmp); 148 free(tmp);
157 149
158 if (old_path) 150 if (old_path)
159 astrcat(&new_path, old_path); 151 astrcat(&new_path, old_path);
160 else 152 else
161 astrcat(&new_path, "/usr/local 153 astrcat(&new_path, "/usr/local/bin:/usr/bin:/bin");
162 154
163 setenv("PATH", new_path, 1); 155 setenv("PATH", new_path, 1);
164 156
165 free(new_path); 157 free(new_path);
166 } 158 }
167 159
168 static const char **prepare_exec_cmd(const cha 160 static const char **prepare_exec_cmd(const char **argv)
169 { 161 {
170 int argc; 162 int argc;
171 const char **nargv; 163 const char **nargv;
172 164
173 for (argc = 0; argv[argc]; argc++) 165 for (argc = 0; argv[argc]; argc++)
174 ; /* just counting */ 166 ; /* just counting */
175 nargv = malloc(sizeof(*nargv) * (argc 167 nargv = malloc(sizeof(*nargv) * (argc + 2));
176 168
177 nargv[0] = subcmd_config.exec_name; 169 nargv[0] = subcmd_config.exec_name;
178 for (argc = 0; argv[argc]; argc++) 170 for (argc = 0; argv[argc]; argc++)
179 nargv[argc + 1] = argv[argc]; 171 nargv[argc + 1] = argv[argc];
180 nargv[argc + 1] = NULL; 172 nargv[argc + 1] = NULL;
181 return nargv; 173 return nargv;
182 } 174 }
183 175
184 int execv_cmd(const char **argv) { 176 int execv_cmd(const char **argv) {
185 const char **nargv = prepare_exec_cmd( 177 const char **nargv = prepare_exec_cmd(argv);
186 178
187 /* execvp() can only ever return if it 179 /* execvp() can only ever return if it fails */
188 execvp(subcmd_config.exec_name, (char 180 execvp(subcmd_config.exec_name, (char **)nargv);
189 181
190 free(nargv); 182 free(nargv);
191 return -1; 183 return -1;
192 } 184 }
193 185
194 186
195 int execl_cmd(const char *cmd,...) 187 int execl_cmd(const char *cmd,...)
196 { 188 {
197 int argc; 189 int argc;
198 const char *argv[MAX_ARGS + 1]; 190 const char *argv[MAX_ARGS + 1];
199 const char *arg; 191 const char *arg;
200 va_list param; 192 va_list param;
201 193
202 va_start(param, cmd); 194 va_start(param, cmd);
203 argv[0] = cmd; 195 argv[0] = cmd;
204 argc = 1; 196 argc = 1;
205 while (argc < MAX_ARGS) { 197 while (argc < MAX_ARGS) {
206 arg = argv[argc++] = va_arg(pa 198 arg = argv[argc++] = va_arg(param, char *);
207 if (!arg) 199 if (!arg)
208 break; 200 break;
209 } 201 }
210 va_end(param); 202 va_end(param);
211 if (MAX_ARGS <= argc) { 203 if (MAX_ARGS <= argc) {
212 fprintf(stderr, " Error: too m 204 fprintf(stderr, " Error: too many args to run %s\n", cmd);
213 return -1; 205 return -1;
214 } 206 }
215 207
216 argv[argc] = NULL; 208 argv[argc] = NULL;
217 return execv_cmd(argv); 209 return execv_cmd(argv);
218 } 210 }
219 211
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