[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini start-stop-daemon implementation(s) for busybox
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| 4 | *
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| 5 | * Written by Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>,
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| 6 | * public domain.
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| 7 | * Adapted for busybox David Kimdon <dwhedon@gordian.com>
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| 8 | */
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| 9 |
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| 10 | #include "busybox.h"
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| 11 | #include <stdio.h>
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| 12 | #include <stdlib.h>
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| 13 | #include <string.h>
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| 14 | #include <stdarg.h>
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| 15 | #include <signal.h>
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| 16 | #include <errno.h>
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| 17 | #include <sys/stat.h>
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| 18 | #include <dirent.h>
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| 19 | #include <unistd.h>
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| 20 | #include <getopt.h> /* struct option */
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| 21 | #include "pwd_.h"
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| 22 |
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| 23 | static int signal_nr = 15;
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| 24 | static int user_id = -1;
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| 25 | static int quiet;
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| 26 | static char *userspec = NULL;
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| 27 | static char *cmdname = NULL;
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| 28 | static char *execname = NULL;
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| 29 | static char *pidfile = NULL;
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| 30 |
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| 31 | struct pid_list {
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| 32 | struct pid_list *next;
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| 33 | pid_t pid;
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| 34 | };
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| 35 |
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| 36 | static struct pid_list *found = NULL;
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| 37 |
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| 38 | static inline void push(pid_t pid)
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| 39 | {
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| 40 | struct pid_list *p;
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| 41 |
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| 42 | p = xmalloc(sizeof(*p));
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| 43 | p->next = found;
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| 44 | p->pid = pid;
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| 45 | found = p;
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| 46 | }
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| 47 |
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| 48 | static int pid_is_exec(pid_t pid, const char *name)
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| 49 | {
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| 50 | char buf[32];
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| 51 | struct stat sb, exec_stat;
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| 52 |
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| 53 | if (name)
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| 54 | xstat(name, &exec_stat);
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| 55 |
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| 56 | sprintf(buf, "/proc/%d/exe", pid);
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| 57 | if (stat(buf, &sb) != 0)
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| 58 | return 0;
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| 59 | return (sb.st_dev == exec_stat.st_dev && sb.st_ino == exec_stat.st_ino);
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| 60 | }
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| 61 |
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| 62 | static int pid_is_user(int pid, int uid)
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| 63 | {
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| 64 | struct stat sb;
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| 65 | char buf[32];
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| 66 |
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| 67 | sprintf(buf, "/proc/%d", pid);
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| 68 | if (stat(buf, &sb) != 0)
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| 69 | return 0;
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| 70 | return (sb.st_uid == uid);
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| 71 | }
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| 72 |
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| 73 | static int pid_is_cmd(pid_t pid, const char *name)
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| 74 | {
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| 75 | char buf[32];
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| 76 | FILE *f;
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| 77 | int c;
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| 78 |
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| 79 | sprintf(buf, "/proc/%d/stat", pid);
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| 80 | f = fopen(buf, "r");
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| 81 | if (!f)
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| 82 | return 0;
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| 83 | while ((c = getc(f)) != EOF && c != '(')
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| 84 | ;
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| 85 | if (c != '(') {
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| 86 | fclose(f);
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| 87 | return 0;
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| 88 | }
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| 89 | /* this hopefully handles command names containing ')' */
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| 90 | while ((c = getc(f)) != EOF && c == *name)
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| 91 | name++;
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| 92 | fclose(f);
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| 93 | return (c == ')' && *name == '\0');
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| 94 | }
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| 95 |
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| 96 |
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| 97 | static void check(int pid)
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| 98 | {
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| 99 | if (execname && !pid_is_exec(pid, execname)) {
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| 100 | return;
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| 101 | }
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| 102 | if (userspec && !pid_is_user(pid, user_id)) {
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| 103 | return;
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| 104 | }
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| 105 | if (cmdname && !pid_is_cmd(pid, cmdname)) {
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| 106 | return;
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| 107 | }
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| 108 | push(pid);
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| 109 | }
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| 110 |
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| 111 |
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| 112 | static void do_pidfile(void)
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| 113 | {
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| 114 | FILE *f;
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| 115 | pid_t pid;
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| 116 |
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| 117 | f = fopen(pidfile, "r");
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| 118 | if (f) {
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| 119 | if (fscanf(f, "%d", &pid) == 1)
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| 120 | check(pid);
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| 121 | fclose(f);
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| 122 | } else if (errno != ENOENT)
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| 123 | bb_perror_msg_and_die("open pidfile %s", pidfile);
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| 124 |
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| 125 | }
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| 126 |
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| 127 | static void do_procinit(void)
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| 128 | {
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| 129 | DIR *procdir;
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| 130 | struct dirent *entry;
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| 131 | int foundany, pid;
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| 132 |
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| 133 | if (pidfile) {
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| 134 | do_pidfile();
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| 135 | return;
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| 136 | }
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| 137 |
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| 138 | procdir = bb_xopendir("/proc");
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| 139 |
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| 140 | foundany = 0;
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| 141 | while ((entry = readdir(procdir)) != NULL) {
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| 142 | if (sscanf(entry->d_name, "%d", &pid) != 1)
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| 143 | continue;
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| 144 | foundany++;
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| 145 | check(pid);
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| 146 | }
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| 147 | closedir(procdir);
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| 148 | if (!foundany)
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| 149 | bb_error_msg_and_die ("nothing in /proc - not mounted?");
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| 150 | }
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| 151 |
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| 152 |
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| 153 | static int do_stop(void)
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| 154 | {
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| 155 | RESERVE_CONFIG_BUFFER(what, 1024);
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| 156 | struct pid_list *p;
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| 157 | int killed = 0;
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| 158 |
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| 159 | do_procinit();
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| 160 |
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| 161 | if (cmdname)
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| 162 | strcpy(what, cmdname);
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| 163 | else if (execname)
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| 164 | strcpy(what, execname);
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| 165 | else if (pidfile)
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| 166 | sprintf(what, "process in pidfile `%.200s'", pidfile);
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| 167 | else if (userspec)
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| 168 | sprintf(what, "process(es) owned by `%s'", userspec);
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| 169 | else
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| 170 | bb_error_msg_and_die ("internal error, please report");
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| 171 |
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| 172 | if (!found) {
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| 173 | if (!quiet)
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| 174 | printf("no %s found; none killed.\n", what);
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| 175 | if (ENABLE_FEATURE_CLEAN_UP)
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| 176 | RELEASE_CONFIG_BUFFER(what);
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| 177 | return -1;
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| 178 | }
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| 179 | for (p = found; p; p = p->next) {
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| 180 | if (kill(p->pid, signal_nr) == 0) {
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| 181 | p->pid = -p->pid;
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| 182 | killed++;
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| 183 | } else {
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| 184 | bb_perror_msg("warning: failed to kill %d", p->pid);
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| 185 | }
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| 186 | }
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| 187 | if (!quiet && killed) {
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| 188 | printf("stopped %s (pid", what);
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| 189 | for (p = found; p; p = p->next)
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| 190 | if(p->pid < 0)
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| 191 | printf(" %d", -p->pid);
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| 192 | printf(").\n");
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| 193 | }
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| 194 | if (ENABLE_FEATURE_CLEAN_UP)
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| 195 | RELEASE_CONFIG_BUFFER(what);
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| 196 | return killed;
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| 197 | }
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| 198 |
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| 199 | #if ENABLE_FEATURE_START_STOP_DAEMON_LONG_OPTIONS
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| 200 | static const struct option ssd_long_options[] = {
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| 201 | { "stop", 0, NULL, 'K' },
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| 202 | { "start", 0, NULL, 'S' },
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| 203 | { "background", 0, NULL, 'b' },
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| 204 | { "quiet", 0, NULL, 'q' },
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| 205 | { "make-pidfile", 0, NULL, 'm' },
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| 206 | #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
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| 207 | { "oknodo", 0, NULL, 'o' },
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| 208 | { "verbose", 0, NULL, 'v' },
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| 209 | #endif
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| 210 | { "startas", 1, NULL, 'a' },
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| 211 | { "name", 1, NULL, 'n' },
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| 212 | { "signal", 1, NULL, 's' },
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| 213 | { "user", 1, NULL, 'u' },
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| 214 | { "exec", 1, NULL, 'x' },
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| 215 | { "pidfile", 1, NULL, 'p' },
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| 216 | #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
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| 217 | { "retry", 1, NULL, 'R' },
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| 218 | #endif
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| 219 | { 0, 0, 0, 0 }
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| 220 | };
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| 221 | #endif
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| 222 |
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| 223 | #define SSD_CTX_STOP 1
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| 224 | #define SSD_CTX_START 2
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| 225 | #define SSD_OPT_BACKGROUND 4
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| 226 | #define SSD_OPT_QUIET 8
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| 227 | #define SSD_OPT_MAKEPID 16
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| 228 | #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
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| 229 | #define SSD_OPT_OKNODO 32
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| 230 | #define SSD_OPT_VERBOSE 64
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| 231 |
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| 232 | #endif
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| 233 |
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| 234 | int start_stop_daemon_main(int argc, char **argv)
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| 235 | {
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| 236 | unsigned long opt;
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| 237 | char *signame = NULL;
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| 238 | char *startas = NULL;
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| 239 | #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
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| 240 | // char *retry_arg = NULL;
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| 241 | // int retries = -1;
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| 242 | #endif
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| 243 | #if ENABLE_FEATURE_START_STOP_DAEMON_LONG_OPTIONS
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| 244 | bb_applet_long_options = ssd_long_options;
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| 245 | #endif
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| 246 |
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| 247 | /* Check required one context option was given */
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| 248 | bb_opt_complementally = "K:S:?:K--S:S--K:m?p:K?xpun:S?xa";
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| 249 | opt = bb_getopt_ulflags(argc, argv, "KSbqm"
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| 250 | // USE_FEATURE_START_STOP_DAEMON_FANCY("ovR:")
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| 251 | USE_FEATURE_START_STOP_DAEMON_FANCY("ov")
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| 252 | "a:n:s:u:x:p:"
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| 253 | // USE_FEATURE_START_STOP_DAEMON_FANCY(,&retry_arg)
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| 254 | ,&startas, &cmdname, &signame, &userspec, &execname, &pidfile);
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| 255 |
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| 256 | quiet = (opt & SSD_OPT_QUIET)
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| 257 | USE_FEATURE_START_STOP_DAEMON_FANCY(&& !(opt & SSD_OPT_VERBOSE));
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| 258 |
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| 259 | if (signame) {
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| 260 | signal_nr = bb_xgetlarg(signame, 10, 0, NSIG);
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| 261 | }
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| 262 |
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| 263 | if (!startas)
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| 264 | startas = execname;
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| 265 |
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| 266 | // USE_FEATURE_START_STOP_DAEMON_FANCY(
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| 267 | // if (retry_arg)
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| 268 | // retries = bb_xgetlarg(retry_arg, 10, 0, INT_MAX);
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| 269 | // )
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| 270 | argc -= optind;
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| 271 | argv += optind;
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| 272 |
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| 273 | if (userspec && sscanf(userspec, "%d", &user_id) != 1)
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| 274 | user_id = bb_xgetpwnam(userspec);
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| 275 |
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| 276 | if (opt & SSD_CTX_STOP) {
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| 277 | int i = do_stop();
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| 278 | return
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| 279 | USE_FEATURE_START_STOP_DAEMON_FANCY((opt & SSD_OPT_OKNODO)
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| 280 | ? 0 :) !!(i<=0);
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| 281 | }
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| 282 |
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| 283 | do_procinit();
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| 284 |
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| 285 | if (found) {
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| 286 | if (!quiet)
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| 287 | printf("%s already running.\n%d\n", execname ,found->pid);
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| 288 | USE_FEATURE_START_STOP_DAEMON_FANCY(return !(opt & SSD_OPT_OKNODO);)
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| 289 | SKIP_FEATURE_START_STOP_DAEMON_FANCY(return EXIT_FAILURE;)
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| 290 | }
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| 291 | *--argv = startas;
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| 292 | if (opt & SSD_OPT_BACKGROUND) {
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| 293 | bb_xdaemon(0, 0);
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| 294 | setsid();
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| 295 | }
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| 296 | if (opt & SSD_OPT_MAKEPID) {
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| 297 | /* user wants _us_ to make the pidfile */
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| 298 | FILE *pidf = bb_xfopen(pidfile, "w");
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| 299 |
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| 300 | pid_t pidt = getpid();
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| 301 | fprintf(pidf, "%d\n", pidt);
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| 302 | fclose(pidf);
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| 303 | }
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| 304 | execv(startas, argv);
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| 305 | bb_perror_msg_and_die ("unable to start %s", startas);
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| 306 | }
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