FreeCalypso > hg > freecalypso-tools
annotate rvinterf/etmsync/symlink.c @ 921:74d284add54d
fc-fsio: guard against bogus readdir results from the target
If the FFS being operated on contains SE K2x0 extended filenames,
readdir will return strings that are bad for printing. We need to
guard against this possibility, and also against possible other
bogosity that could be sent by other alien firmwares.
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 31 Dec 2022 22:55:23 +0000 |
parents | e7502631a0f9 |
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rev | line source |
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0
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1 /* |
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2 * Commands for experimenting with FFS symlinks |
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3 */ |
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4 |
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5 #include <sys/types.h> |
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6 #include <stdio.h> |
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7 #include <stdlib.h> |
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8 #include <string.h> |
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9 #include <strings.h> |
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10 #include "etm.h" |
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11 #include "ffs.h" |
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12 #include "tmffs2.h" |
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13 #include "limits.h" |
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14 #include "ffslimits.h" |
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15 #include "localtypes.h" |
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16 #include "localstruct.h" |
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17 #include "exitcodes.h" |
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18 |
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19 extern u_char rvi_msg[]; |
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20 extern int rvi_msg_len; |
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21 |
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22 do_symlink(target, realobj) |
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23 char *target, *realobj; |
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24 { |
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25 u_char cmdpkt[MAX_PKT_TO_TARGET], *dp; |
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26 int rc, targlen, reallen; |
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27 |
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28 reallen = strlen(realobj); |
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29 if (reallen >= TMFFS_STRING_SIZE) { |
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30 printf("error: pathname arg exceeds string length limit\n"); |
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31 return(ERROR_USAGE); |
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32 } |
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33 targlen = strlen(target); |
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34 if (3 + (reallen+2) + (targlen+2) + 1 > MAX_PKT_TO_TARGET) { |
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35 printf("error: symlink request fails to fit into packet\n"); |
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36 return(ERROR_USAGE); |
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37 } |
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38 dp = cmdpkt + 1; |
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39 *dp++ = ETM_FFS2; |
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40 *dp++ = TMFFS_SYMLINK; |
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41 *dp++ = reallen + 1; |
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42 strcpy(dp, realobj); |
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43 dp += reallen + 1; |
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44 *dp++ = targlen + 1; |
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45 strcpy(dp, target); |
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46 dp += targlen + 1; |
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47 rc = etm_pkt_exch(cmdpkt, dp - cmdpkt - 1); |
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48 if (rc) |
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49 return(rc); |
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50 if (rvi_msg_len != 5) { |
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51 printf("error: TMFFS_SYMLINK response has wrong length\n"); |
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52 return(ERROR_TARGET); |
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53 } |
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54 if (rvi_msg[3]) { |
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55 report_ffs_err("symlink", rvi_msg[3]); |
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56 return(ERROR_TARGET); |
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57 } |
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58 return(0); |
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59 } |
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60 |
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61 cmd_symlink(argc, argv) |
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62 char **argv; |
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63 { |
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64 return do_symlink(argv[1], argv[2]); |
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65 } |
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66 |
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67 do_readlink(pathname, databuf, rdret) |
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68 char *pathname; |
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69 u_char *databuf; |
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70 int *rdret; |
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71 { |
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72 u_char cmdpkt[MAX_PKT_TO_TARGET], *dp; |
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73 int rc, slen, sz; |
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74 |
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75 slen = strlen(pathname); |
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76 if (slen >= TMFFS_STRING_SIZE) { |
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77 printf("error: pathname arg exceeds string length limit\n"); |
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78 return(ERROR_USAGE); |
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79 } |
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80 dp = cmdpkt + 1; |
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81 *dp++ = ETM_FFS2; |
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82 *dp++ = TMFFS_READLINK; |
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83 *dp++ = slen + 1; |
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84 strcpy(dp, pathname); |
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85 dp += slen + 1; |
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86 *dp++ = 0; /* dummy 2nd buffer */ |
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87 rc = etm_pkt_exch(cmdpkt, dp - cmdpkt - 1); |
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88 if (rc) |
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89 return(rc); |
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90 if (rvi_msg[3]) { |
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91 report_ffs_err("readlink", rvi_msg[3]); |
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92 return(ERROR_TARGET); |
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93 } |
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94 if (rvi_msg_len < 6) { |
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95 *rdret = 0; |
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96 return(0); |
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97 } |
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98 sz = rvi_msg[4]; |
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99 if (rvi_msg_len != sz + 6) { |
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100 printf("error: readlink response has wrong length\n"); |
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101 return(ERROR_TARGET); |
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102 } |
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103 bcopy(rvi_msg + 5, databuf, sz); |
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104 *rdret = sz; |
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105 return(0); |
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106 } |
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107 |
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108 cmd_readlink(argc, argv) |
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109 char **argv; |
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110 { |
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111 u_char databuf[256]; |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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112 int rc, sz, off, l; |
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parents:
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113 |
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114 rc = do_readlink(argv[1], databuf, &sz); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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115 if (rc) |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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116 return(rc); |
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117 printf("%d bytes read\n", sz); |
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118 for (off = 0; off < sz; off += 16) { |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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119 l = sz - off; |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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120 if (l > 16) |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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121 l = 16; |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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122 hexdump_line(off, databuf + off, l); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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123 } |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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124 return(0); |
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parents:
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125 } |
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parents:
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126 |
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parents:
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127 do_readlink_sancheck(pathname, databuf) |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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128 char *pathname; |
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Mychaela Falconia <falcon@freecalypso.org>
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129 u_char *databuf; |
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Mychaela Falconia <falcon@freecalypso.org>
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130 { |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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131 int rc, sz; |
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parents:
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132 |
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133 rc = do_readlink(pathname, databuf, &sz); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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134 if (rc) |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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135 return(rc); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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|
136 if (sz < 2 || databuf[sz-1]) { |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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137 printf("error: readlink on %s returned garbage\n", pathname); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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138 return(ERROR_TARGET); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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139 } |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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140 return(0); |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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141 } |